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Contents Page
1. Functional description 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Circuits with fixed displacement pump 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Circuits with regulable variable displacement pump 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Description of the valve sections 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 SU, SO/SF and SL pump connection modules 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 SY, SZ, SD and SE actuator modules 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Actuating methods 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Manual actuation 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Hydraulic actation 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Electrical actuation E1/E2/M2(M1)/M3(M4) 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 Combined actuation 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. Additional functions 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Pressure reduction (control−oil supply) 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Actuator flow reduction (AVR) 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Adapter plate for combining different nominal sizes of valve 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4 Actuator pressure protection separated on A and B sides 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. Sizes 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 General 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 Actuating methods 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6. Type codes 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 Type codes with example for ordering 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2 Position of the hand lever 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3 Spool symbols 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7. Dimensions 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.1 Pump connection modules 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2 Actuator modules with type of actuation H6 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.3 Actuator modules with type of actuation H7 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.4 Actuator modules with type of actuation S1, S2, S3, S4 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.5 Actuator modules with type of actuation H0 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.6 Actuator modules with type of actuation Y0 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.7 Actuator modules with type of actuation E1/E2 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.8 Actuator modules with type of actuation E7/E8 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.9 Actuator modules with type of actuation M2(M1) 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.10 Actuator modules with type of actuation M3(M4) 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.11 Actuator modules with type of actuation M6(M5) on request only 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.12 Actuator modules with type of actuation Y1/Y2 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.13 Actuator modules with type of actuation Y7/Y8 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.14 Actuator modules with type of actuation B2(B1) 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.15 Actuator modules with type of actuation B3(B4) 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.16 Actuator modules with type of actuation B6(B5) on request only 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.17 Actuator modules with type of actuation K1/K2 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.18 Actuator modules with type of actuation K8(K5) on request only 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.19 Actuator modules with type of actuation K9(K6) 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.20 Actuator modules with type of actuation K0(K7) 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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1. Functional description
Bucher’s sandwich−type proportional
valves control the volumetric flow to the
actuator independent of the load, be-
cause a 2−way pressure compensator
is assigned to each proportional direc-
tional control valve in the SZ, SY, SD
and SE actuator modules. In addition,
the actuator modules comprise pri-
mary pressure relief devices that can
be adjusted individually for each ac-
tuator. The flexible modular system
enables the setup to be adapted per-
fectly to the respective application. The
actuating methods available − manual,
hydraulic, electrial or any combination
of these − and the various pump con-
necting modules − with and without
pressure compensator or pressure re-
lief valve − open up a wide range of
possible applications.
The valve system consists of 2 to 9 indi-
vidual modules which are held together
by tie rods. The entire valve is made up
of one pump connecting module (ei-
ther SU, SL or SO/SF), 1 to 7 SY/SZ ac-
tuator modules and one SD/SE actua-
tor module as the end section.
All proportional directional control val-
ves are equipped with an internal load
check−back signaling device for the
2−way pressure compensator that be-
longs to them. The highest load pres-
sure signal is fed via selector valves to
the pump connecting module. At this
module, the signal is available either to
the SU pressure compensatort or for
actuating regulable pumps (SO, SL,
SF) via port XL. When the proportional
directional contol valves are in their
neutral position, the load on the load si-
gnaling channels and pressure com-
pensator spring cavities can be relie-
ved via 2 series−connected nozzles.
1.1 Circuits with fixed displacement pump
1.1.1 SU pump connecting module
Preferred application with fixed displa-
cement pump for simultaneous, load−
independent actuation of a number of
actuators. The SU pump connecting
module takes care of maximum pres-
sure protection for the complete system
and also acts as a recirculation valve to
provide as good as pressureless circu-
lation when actuators are not actuated.
À Option
XL
T
P
ÀÀ
À
À
SU
SZ
SE
aX
bY aX bY
DUE 2
DUE 1
DUE 4 DUE 4
A1 B1 A2
B2
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1.2 Circuits with regulable variable displacement pump
1.2.1 SO/SF pump connecting module
Preferred application with variable dis-
placement pumps for simultaneous,
load−independent actuation of a num-
ber of actuators.The variable displace-
ment pump can operate pressure−re-
gulated (a) or pressure− and delivery−
rate−regulated (load−sensing princi-
ple) (b). The load check−back signal is
sent to the pump regulator via port XL.
Alternatively, the load on the load si-
gnaling channel can be relieved in the
pump regulator or in the SF pump con-
necting module.
SO pump connecting module:
without relief nozzles
SF pump connecting module:
with relief nozzles
XL
T
P
DUE 2
DUE 4
DUE 4
A1
B1
A2
B2
SZ SE
a
b
a
b
(a)
(b)
SF/(SO)
Optional
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1.2.2 SL pump connecting module (pressure relief valve)
If pressure−regulated (a) or pressure−
and delivery−rate−regulated (load−
sensing principle) (b) variable displa-
cement pumps also have to be protec-
ted against pressure peaks, an SL
pump connecting module with primary
pressure relief must be fitted.
XL
T
P
DUE 2
DUE 4
DUE 4
A1
B1
A2
B2
SZ SE
aba b
(a)
(b)
SL
DUE 3
Optional
2. Description of the valve sections
2.1 SU, SO/SF and SL pump connection modules
2.1.1 SU pump connecting module
The SU pump connecting module con-
sists of a pressure compensator and a
pressure relief valve as a pilot unit.
When actuators are operated, the SY,
SZ, SD and SE actuator modules send
the load signal with the maximum pres-
sure to the pressure compensator. The
compensator preloads the delivery
flow coming from the pump in accor-
dance with this load signal, so that an
adequate system pressure is available
to all directional control valve sections
(SY, SZ, SD and SE) irrespective of
changing loads. The excess pump de-
livery flow returns to the tank. If the per-
missible system pressure is exceeded
by the load signal, the pressure relief
valve opens and the pressure compen-
sator operates as the main stage of the
pressure relief system, i.e. the delivery
flow from the pump is fed to the tank.
If no load signal is being applied to the
pressure compensator because no di-
rectional control valve is connected to
the actuator, the pressure compensator
feeds the delivery flow from the pump
back to the tank under as good as no
pressure at all.
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Application: see section 1.1.1, page 3
Setting of minimum pressure
differential for load sections
Control spring
Additional control spring (no standard)
Setting of maximum
pressure
Inlet nozzle, DUE1
XL
Load signaling channels
Relief nozzles, DUE2
Filter
Pressure compensator piston SU
P
T
SU
XL
Y1
T
Y2
P
X
Z
DUE 2
DUE 3
NG 18/25:
Z, Y1 not present
clogged
open
2.1.2 SO/SF pump connecting module
The SO pump connecting module ser-
ves purely as a connecting plate. It has
no influence on the actuator modules
downstream of it. Load signal port XL
generates the load check−back signal
sent to the variable displacement
pump in load−sensing systems.
Alternatively, the load on the load si-
gnaling channel can be relieved in the
pump regulator or in the SF pump con-
necting module.
SO pump connecting module:
without relief nozzles
SF pump connecting module:
with relief nozzles
SO
XL
Y1
T
Y2
P
X
Z
DUE 2
SF
XL
Y1
T
Y2
P
X
Z
NG 18/25:
Z, Y1 unavailable
clogged
open
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2.1.3 SL pump connecting module
The SL pump connecting module com-
prises a pilot−controlled pressure relief
valve for protecting the control pump
against impermissibly high pressures.
Load signal port XL generates the load
check−back signal sent to the variable
displacement pump in load−sensing
systems.An appropriate nozzle combi-
nation is provided to relieve the load on
the pump regulator when the proportio-
nal valves are not operated.
SL
XL
Y1
T
Y2
P
X
Z
Application: see section 1.2.2, page 5
NG 18/25:
Z, Y1 not present
clogged
open
12 SL
18 SL
25 SL
Control spring
Setting of maximum
pressure
Inlet nozzle, DUE3
Filter
Pressure compensator piston SL
Load signaling channels
Relief nozzles, DUE2
Setting of maximum
pressure
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2.2 SY, SZ, SD and SE actuator modules
Each of these modules comprises a
proportional directional control valve
and a 2−way pressure compensator
that, in conjunction with a pilot−control-
led pressure relief valve, also serves to
protect against overpressure.
The proportional directional control val-
ves can be equipped with various ver-
sions of piston, as described in section
6.3, page 19 The metering edges of the
main control piston are adapted indivi-
dually for the respective application.
This makes it possible to operate asym-
metrical actuators, such as differential
cylinders, at the same maximum speed
in both directions of travel making full
use of the stroke of the proportional val-
ves control piston. The 2−way pressure
compensator performs a number of
functions. When the proportional valve
is actuated, a connection is made bet-
ween actuating port A or B and the
spring cavity of the pressure compen-
sator by means of the internal load
check−back signaling device. It is in
this way that the flow control function of
the actuator module is initiated. If the
load pressure exceeds the value set at
the pilot−controlled pressure relief
valve, the pressure compensator
piston acts as a pressure reducing
valve. This stops the flow from the
pump to the actuator.
Return flow of the pressure fluid from
A/B − P can be prevented by means of
a check valve that is integrated in the
pressure compensator (SZ and SE ac-
tuator modules).
In particular, the check valve is not re-
quired when load holding valves (load
control valves for lowering, pilot−con-
trolled check valves) are used; actuator
modules SY and SD must then be used.
The advantages of module types SY
and SD here are the low pressure los-
ses in the valves themselves and the
higher maximum possible flow rate
through the valves (see figure 2.2.2,
page 9).
Pressure compensator
piston DUE4
Pressure compensator
control spring
Check valve spring
Setting of pressure differential
of main control piston
Setting of maximum pressure
of load section
Selector valve (load check−
back signaling system)
TTMain control piston ND
Setting of maximum stroke
Load signaling channels
Pressure compensator
piston
Pressure compensator
restrictor
Check valve
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2.2.1 Figure
SZ
SE SY SD
XL
Y1
T
Y2
P
X
Z
L1
XL
Y1
T
Y2
P
X
Z
L1
XL
Y1
T
Y2
P
X
Z
L1
XL
Y1
T
Y2
P
X
Z
L1
A
BA
B
A
B
A
B
a
b
a
b
a
b
a
b
NG 18/25 without Z port
2.2.2 Figure: Flow characteristics with maximum displacement of main control piston
NG 12
NG 18 NG 25
Q [%] Q [l/min] Q [l/min] Q [l/min]
SZ, SE 100 95 190 450
SY, SD 100 106 210 500
0 10 20 30 40 50 60 70 80 90 100
Pressure differential∆p
P−A/B
[bar]
Valve flow Q
P−A/B
[%]
0
2
4
6
8
a
b
c
d
P−A/B
10
The volumetric flow rates quoted are
guidelines. They depend on a great
number of parameters and must be
determined on a case by case basis.
a) Connection P − A/B with minimum
cross−section
b) Connection P − A/B with maximum
cross−section
c) Connection A/B − T
(piston model A)
Connection A − T
(piston model D, F, L)
Connection B − T
(piston model B, G, K)
d) Connection A/B − T
(piston model C)
Connection A− T
(piston model B)
Connection B− T
(piston model D)
The main control pistons can be manu-
factured with different cross sections of
opening to suit the particular applica-
tion (in addition to different piston sym-
bols). The chart shows the limits of ap-
plication.
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3. Actuating methods
All common methods of actuation can
be used with the actuator modules −
manual, hydraulic, electrical and com-
binations of these.
3.1 Manual actuation
3.1.1 Actuation H6
The housing of the manual actuation
unit is pressure−tight up to 50 bar.
The lever length required when the
valve piston is in the neutral position
must be specified when ordering (see
section 6.2, p. 18). The main control
piston and the actuating element are
held in the neutral position by a spring−
loaded centering mechanism.
The actuating force increases as the
displacement increases.
3.1.2 Manual actuation with electrical switching contacts S1...S4
This actuating method is similar to H6
actuation, but is equipped with electri-
cal switching contacts that serve to ac-
tivate and deactivate additional and
auxiliary functions (valves, drives, re-
lays etc.). Normally closed, normally
open and changeover contacts can be
implemented.
3.1.3 Manual actuation with positional locking and friction H7
With this actuating method, the main
control piston is not springcentered.
3.2 Hydraulic actation
In unactuated state, the main control
piston is held in neutral position by a
centering spring. When pressure is ap-
plied to control channels a, X/b and Y
(see figure 1.1.1, p. 3), the main con-
trol piston is displaced proportional to
the control pressure differential ap-
plied.
Manually actuated, hydraulic pilot devi-
ces are used to generate the control
pressure differential.
3.3 Electrical actuation E1/E2/M2(M1)/M3(M4)
An electrically and proportionally ac-
tuated pressure regulator serves as a
pilot valve, the pressure as standard
being supplied to it internally from the
pump channel. The return line is con-
nected internally to the tank channel.
An external supply of control oil and re-
turn to the tank is also available as an
option.
The main control piston is spring−cen-
tered and is displaced proportional to
the electrical control current by the con-
trol pressure differential regulated by
the pilot valve (see control pressure
characteristics, figure 3.3.1, p.11). The
supply and return of control oil requires
the following minimum pressure diffe-
rentials between the pump and tank
ports or between the external ports: 8
bar for opening and 20 bar for full dis-
placement of the main control piston.
The electrical control current is conver-
ted to a control pressure differential by
proportional solenoids that continue
displacing the pilot piston until an equi-
librium of forces is achieved at the pilot
piston between the magnetic force and
the control pressure differential.
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3.3.1 Figure: Transient function
Main control piston stroke [%]
Time [ms]
0
25
50
75
100
0 200 400 600 800 1000
Transient function with stepped electrical input 50 % "25 %.
3.4 Combined actuation
3.4.1 Hydraulic/manual HO
0
a
b
AB
PT
Priority is given to manual actuation when the actuating forces require this.
3.4.2 Electrohydraulic/manual K...
0
ab
A
B
PT
Priority is given to manual actuation when the actuating forces require this.
3.4.3 Electrohydraulic/hydraulic Y.. / B..
0
a
b
A
B
PT
With this combination, the actuating method that is active is always that with
the greatest control pressure differential.
4. Additional functions
In addition to the standard valve ver-
sions described in sections 1 to 3, there
are numerous additional functions
available for customizing systems to
the particular requirements for the con-
trol tasks to be solved.
Section 4 provides an overview of the
most important of these additional
functions. More detailed information is
available on request.
4.1 Pressure reduction (control−oil supply)
If necessary, this SX end module ma-
kes it possible to do without a separate
control−oil pump, e.g. for supplying hy-
draulic control pressure sensors or for
actuating hydraulic braking (load con-
trol) equipment. The necessary pres-
sure regulator with downstream pres-
sure protection is integrated into a
flange−mountable housing (see figure
4.2.1, p. 13). When there is an internal
connection to the actuator modules via
port X, the P − X connection in the pump
connecting module must be interrup-
ted.
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4.1.1 Figure:
SZ/SY
Y1
T
Y2
X
Z
L1
A
B
aX
bY
P
SX
XL
X3
4.2 Actuator flow reduction (AVR)
The load−independent operating
mode of a load−sensing control system
no longer functions if the pump delivery
flow is no longer sufficient to cover the
requirements of the actuators. The sup-
ply of oil to the actuator operating with
the highest load pressure then breaks
down.
This problem can be remedied by Bu-
cher’s AVR system (AVR = Automatic
Volumetric flow Reduction) with an SX
end module (see figure 4.2.1, p. 13).
This system automatically reduces the
amount of valve displacement if the
sum of the actuator flows begins to ex-
ceed the pump delivery flow available.
This error in the volumetric flow balance
is detected by the AVR pressure regula-
tor and transferred to the pilot pressure
of the proportional directional control
valves by reducing the control pressu-
res preset by means of the pilot valves.
First, the AVR system reduces the hig-
hest control pressure that arises and, in
the process, the control section of the
proportional directional control valve
that is open to the greatest extent, too.
If necessary, the next−highest control
signals are reduced until the actuator
flows and pump flows are balanced.
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4.2.1 Figure:
XL
T
P
DUE 2
DUE 4
DUE 4
A1 B1
A2
B2
SZ
SX
a
b
a
b
DUE 3
SZ
AVR−valve
4.3 Adapter plate for combining different nominal sizes of valve
It is also possible to combine valves
with different nominal sizes for control
systems with greatly differing actuator
flows using an SM adapter module.
This option enables both costs and
weight to be reduced.
4.4 Actuator pressure protection separated on A and B sides
A further option is that of different pres-
sure protection for the actuator ports A
and B.
It must be noted that the pressure at
port B can only be set to a value lower
than that at port A (see figure 4.4.1).
With this additional function, separate
pilot pressure relief valves are fitted in
the SY, SZ, SD and SE actuator modu-
les for ports A and B. If the load pres-
sure exceeds the values set at the pilot
valves, the pressure compensator
piston acts as a pressure reducing
valve.
4.4.1 Figure:
Y1
T
Y2
X
Z
L1
A1 B1
P
XL
a
b
SY
DUE4
DUE5
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5. Sizes
5.1 General Design all functions: slide valve
pilot relief valve: seat valve
Actuation electrically actuated proportional,
hydraulic, manual
Type of connection company standard: see sec. 7., p. 19
for connecting thread
Installation position any
Weight of pump connection modules see table 5.1.1, p. 14
Weight of actuator modules SZ, SE see table 5.1.2, p. 15
Ambient temperature −30 ... 60ºC
Hydraulic medium mineral oil per DIN 51524 and
DIN 51525 (HL/HLP)
Recommended pressure
fluid temperature
min. temperature
max. temperature
20 ... 60ºC
−20ºC
+80
ºC
Other temperature – contact Bucher
Recommended viscosity range
min. viscosity
max. viscosity
15 ... 100 mm
2
/s
10 mm
2
/s
380 mm
2
/s
Filtering/purity class see table 5.1.3, p. 15
Max. working pressure
Port P/A/B
T port
... 350 bar
... 50 bar
Max. pump delivery flow NG 12: 200l/min.
NG 18: 400l/min.
NG 25: 900l/min.
Nominal flow NG 12: 95 (105)l/min.
NG 18: 190 (210)l/min.
NG 25: 450 (500)l/min.
Flow characteristics see figure 2.2.2, p. 9
5.1.1 Table: Weight of pump connecting modules [kg]
NG 12 NG 18 NG 25
SU 5.4 12.2 26.5
SL 5.4 12.2 26.5
SO / SF 4.4 10.3 26.5
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5.1.2 Table: Weight of actuator modules SZ and SE [kg]
NG 12 NG 18 NG 25
H6 manual actuation 5.8 13.0 −
H7 man. actuation w. friction and positional locking 6.1 13.7 −
Y0 hydraulic actuation 6.0 13.0 34.7
E1, E2
M2(M1), M3(M4)
electrical actuation 8.1 15.7 36.6
K0...K9 electrical/manual actuation 8.4 16.3 −
H0 hydraulic/manual actuation 6.3 14.1 −
Y1, Y2
B2(B1), B3(B4)
electrical/hydraulic actuation 11.0 18.6 39.5
5.1.3 Table: Standards for operational reliability and service life
ISO 4406 Class 18/15
NAS 1638 Class 9
5.2 Actuating methods
5.2.1 Manual Max. actuating angle approx. 20 degrees
Actuating force
neutral pos
max. control
NG 12: 1.4 daN
NG 18: 2.2 daN
NG 25: −
NG 12: 4.2 daN
NG 18: 6.6 daN
NG 25: −
5.2.2 Hydraulic Control pressure range 6...18 bar
5.2.3 Electrohydraulic
5.2.3.1 Proportional with 12 V and 24 V
DC standard solenoids
Hysteresis v.E. ≤6 % (control with 70 − 100 Hz
PWM signal)
Recovery time for control piston
stroke 25 %−75 %
see chart (figure 3.3.1, p. 11)
Recommended dither freq. 70...100 Hz
Supply pressure (internal and
external) for the pilot valve
20...350 bar (*)
Type of protection per DIN 40050 IP65
Cyclic duration factor 100 %
Insulation class F
Max. ambient temperature 45ºC
(*) during the internal supply the circuit pressure has to be at least 8 bar in the resting position of the main spool valve
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5.2.3.2 Table Voltage type DC voltage
Rated voltage 12 V 24 V
Coil resistance at 20ºC 4.9 W + 5 % 19.6 W + 5 %
Coil resistance at 60ºC 5.67 W 22.7 W
Control current range for Q = 0...100 % 480 ... 1200 mA 260 ... 650 mA
Power input at max. valve displace-
ment (coil resistance at 60ºC)
8.2 W 9.6 W
Max. perm. current 1.9 A 0.95 A
Inductance (start of stroke...end of
stroke)
0.07...0.13 H 0.29...0.55 H
Electrical connection Power socket per DIN EN
175301−803 (DIN43650)
5.2.3.3 Switching (ON/OFF) as explo
sion−proof version (intrinsically
safe) Type of protection per EG RL 94/9
I M2 EEx ia
I
Rated voltage 12 V
Making current 260 mA
Holding current 130 mA
Power input
Switch−on
Holding
3.2 W
1.6 W
Solenoid certification DMT 99 ATEX E 102
5.2.3.4 Proportional as explosion−proof
version (intrinsically safe)
Type of protection per EG RL 94/9 I M2 EEx ia
I
Rated voltage 12 V
Control current range for Q = 0...100 % 90...270 mA
Power input at max. valve
displacement
< 2 W
Solenoid certification DMT 99 ATEX E 102
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6. Type codes
6.1 Type codes with example for ordering
Sandwich−Valve
Valve construction series
= SV
Nominal size
= 8,12,18,25
Type of module
Additional port XLA/XLB
Alternatively int./ext. con-
trol oil supply, V7
Additional details in plain tex
t
(examples)
Z1 =
Z2 =
V...
Variant numbe
r
Manufacturer’s code, not t
o
be quoted when orderin
g
V... =
Flow P − A
Flow P − B
Volumetric flow in l/min.at rated trave
l
(stroke) of the main control pisto
n
(with manual actuation, otherwise 0), see section 6.2, p. 1
8
Position of the hand leve
r
see section 6.3, p. 19
Piston symbol (with SY, SZ, SD, SE
)
Actuating metho
d
.../ =
/... =
Serial cod
e
C =
C
Input module
Pump connecting module with 3−way pressure
compensator (sec. 1.1.1, p. 3 and 2.1.1, p.
5), sizes 12 and 18 only. Size 25 on request.
Pump connecting module with no function
(sec. 2.1.2, p. 6)
Pump connecting module with relief of the load
signaling channel (sec. 2.1.2, p. 6)
Pump connecting module with pump pressure
protection on behalf of the hydraulic pump
against over pressure (sec.1.2.2, p. 5 and
2.1.3, p. 7)
Adapter module
Actuator module without check valve in the
2−way pressure compensator (D2)
Actuator module with check valve in the 2−way
pressure compensator (D1)
Adapter module with special function (specifi-
cation in plain text under additional details)
End module
Actuator module without check valve in the
2−way pressure compensator (D2)
Actuator module with check valve in the 2−way
pressure compensator (D1)
Adapter module with special function (specifi-
cation in plain text under additional details)
SV
12 SU 300
SV
SV
SV
12
12
12
SZ
SY
SE
090
270
300
E2
K2
Y0
O
V
O
A
C
C
100
030
060
090
050
060
C
C
C
C
V4
V4
−
−
Z...
Z...
Z...
−
−
/
−
−
−
−
−−
−
−
−
−
−−
−
−
−
−
−
−−
−
−
/
/
Input module
Adapter module
(max. 7)
End module
Without pressure specification, factory−set to a max.
Pressure setting 50 ... 350 bar
Manual (size 12 and 18 only
)
Standard
Additionally with friction and positional locking
Additionally with 1 switch and 2 positions
Additionally with 2 switches and 2 positions
Additionally with 1 switch and 3 positions
Additionally with 2 switches and 3 positions
Hydraulic
Electrohydrauli
c
Proportional 12 V DC
Proportional 24 V DC
On−off 12 V DC
On−off 24 V DC
Proportional (intrinsically safe) see Table 6.1.1, p. 18
On−off (intrinsically safe) see Table 6.1.1, p. 18
On−off (intrinsically safe) with cable end see Table 6.1.1, p. 18
Electrohydraulic/hydrauli
c
Proportional 12 V DC
Proportional 24 V DC
On−off 12 V DC
On−off 24 V DC
Proportional (intrinsically safe) see Table 6.1.1, p. 18
On−off (intrinsically safe) see Table 6.1.1, p. 18
On−off (intrinsically safe) with cable end see Table 6.1.1, p. 18
Elektrohydraulisch/manuell (size 12 and 18 only)
Proportional 12 V DC
Proportional 24 V DC
Proportional (intrinsically safe) see Table 6.1.1, p. 18
On−off (intrinsically safe) see Table 6.1.1, p. 18
On−off (intrinsically safe) with cable end see Table 6.1.1, p. 18
Hydraulic/manual (size 12 and 18 only)
H6 =
H7 =
S1 =
S2 =
S3 =
S4 =
YO =
E1 =
E2 =
E7 =
E8 =
M2(M1) =
M3(M4) =
M6(M5) =
Y1 =
Y2 =
Y7 =
Y8 =
B2(B1) =
B3(B4) =
B6(B5) =
K1 =
K2 =
K8(K5) =
K9(K6) =
K0(K7) =
H0 =
= SU
= SO
= SF
= SL
= SY
= SZ
= SM
= SD
= SE
= SX
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6.1.1 Type code table Old−unit 30.06.03 New−from 01.07.03
Designation EE ia I
I M2 EEx i a I
Approval No. BVS Nr. 85.1035 DMT 99 ATEX E 102
Electric proportional M1 M2
pp
ON/OFF
M4
M3
ON/OFF
M5* M6*
Electro−hydraulic prop. B1 B2
ypp
ON/OFF
B4
B3
ON/OFF
B5* B6*
Electro−mech. prop. K5 K8
pp
ON/OFF
K6
K9
ON/OFF
K7* K0*
* on request only
6.2 Position of the hand lever
Manual type of actuation H6/H7/K/S
Possible lever positions
O
B3
B1
B2
A
B
P−A
P−B
20°
20°
H1
V
P−A
P−B
A
B
W
P−A
P−B
A
B
A
P−A
P−B
A
B
S
A
B
B5
H4
H5
H2
P−A
P−B
Lever 45° offset lever straight
Dimensions
NG B1
B2 B3 B4 B5 H1 H2 H3 H4 H5 H6 L1 L2
12 146 14 19.5 194 11.2
148 50.3 11.2 177 245 95 198 8
18 230.5 19.5 28 316 15 232 81.30 15 294 398 135 320 10
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6.3 Spool symbols
A
BCD
F
G
K
L
AB AB AB
AB
AB
AB
A
B
P T P T P T P T
P T P T P T P T
7. Dimensions
7.1 Pump connection modules (figures depict NG 12)
12 SU, 12 SL
18 SU, 18 SL
12 SU
18 SU
12 SL
18 SL
H4
H1
H2
H3
D
L2
L1
L3
MP
MT
H5
H6
H7
B9
B1
B8
B7
B6
B5
B4
H8
H9
H10
H11
B2
B3
Filter
T
Y1
X
P
Z
DUE2
DUE1
XL
Y2
B9
B8
B7
B6
B5
B4
B1
MP
MT
H8
H9
H10
H11
H5
H6
H7
B2
B3
Filter
T
Y1
Z
DUE2
DUE1
XL
Y2
X
P
SO/SF
H13
H1
D
L5
L4
L6
H12
H3
B11
B12
Filter (with SF)
H14
H15
H16
B17
B1
B16
B15
B14
B13
H17
H18
H19
P
Z
DUE
Y2
T
XL
X
*H4
L1
H1
L2
H2
H3
L3
D
Filter (with SL/SF)
H9
H8
B9
B10
B1
B8
B6
B4
B5
B7
X
P
XL
Y2
T
F1
MT
H11
H10
H7
25 SL (25 SU on request)
Dimensions
NG L1
L2 L3 L4 L5 L6
12 50 10 54.5 45 15 49.5
18 63 10.5 67.5 55 12.5 59.5
25 75 20 79.5 − − −
NG B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 B15 B16 B17
12 122 95 74.5 13.5 37.5 67.5 85 99 188 177 104.5 85.3 30 64 66 105.5 125.5
18 165 − − 104 49 97 124 129 239.5 228 − 81.5 44 89 130 142.5 169.5
25 230 − − 125 60 167 20 210 260.5 234.5 − − − − − − −
301-P-9050022-E-02/08.2015
H3
H1
H2
L2
L1
L3
SY, SZ
H3
H1
H2
L2
L4
L1
L3
L5
B
A
DD
H4
H5
SD, SE SY, SZ, SD, SE
B1
B2
H6
H7
B
A
20/30
NG H1 H2 H3 H4 H5 H6 H7 H8 H9 H10 H11 H12 H13 H14 H15 H16 H17 H18 H19
12 130 90 4.5 169 116 100 76 29 41 76.5 102 80 138 96 65 48 29 62 113
18 180 112 4.5 219 − − 118 43 15 134 141 112 189 − 108 68.5 45 131 161.5
25 240 135 4.5 280.5 − − 170 68 89 148.5 97 − − − − − − − −
Connecting thread Fastening thread
NG P/T
MP MT X XL Y1 Y2 Z D
12 G 3/4 G 1/2 G 1/2 G 1/4 G 1/4 G 1/4 G 1/4 G 1/4
M8, 12 deep
18 G1 1/4 G 3/4 G 3/4 G 1/4 G 1/4 − G 1/4 − M10, 15 deep
25 G1 1/2 − G 3/4 G 1/4 G 1/4 − G 1/4 − M16, 25 deep
7.2 Actuator modules with type of actuation H6 (Fig. NG 12, H6O)
Connecting thread Fastening thread
NG A/B D
12 G 1/2
M8, 12 deep
18 G1 M10, 15 deep
25 G1 1/2 M16, 25 deep
Dimensions
NG L1
L2 L3 L4 *L5 H1 H2 H3 H4 H5 H6 H7 B1 B2
12 45 22.5 48 37 *10
130 84 46 24 106 53.5 292.3 122 140
18 55 27.5 60.5 27.5 *9 180 117 63 8 172 58.5 388.3 165 176.5
25 − − − − − − − − − − − − − −
* only for valves with more than 5 modules
301-P-9050022-E-02/08.2015
H3
H1
H2
L2
L1
L3
SY, SZ
H3
H1
H2
L2
L4
L1
L3
L5
BA
DD
H4
H5
SD, SE SY, SZ, SD, SE
B1
B2
H8
H9
B
A
H3
H1
H2
L2
L1
L3
SY, SZ
H3
H1
H2
L2
L4
L1
L3
L5
A
D
D
H4
H5
SD, SE
B1
B2
H6
H7
BA
SY, SZ, SD, SE
B
B3
21/30
7.3 Actuator modules with type of actuation H7 (Fig. NG 12, H7O)
Connecting thread Fastening thread
NG A/B
D
12 G 1/2
M8, 12 deep
18 G1 M10, 15 deep
25 G1 1/2 M16, 25 deep
Dimensions
NG L1
L2 L3 L4 *L5 H1 H2 H3 H4 H5 H8 H9 B1 B2
12 45 22.5 48 37 *10
130 84 46 24 106 93.7 332.5 122 140
18 55 27.5 60.5 27.5 *9 180 117 63 8 172 107.5 437.5 165 176.5
25 − − − − − − − − − − − − − −
* only for valves with more than 5 modules
7.4 Actuator modules with type of actuation S1, S2, S3, S4 (Fig. NG 12, S10)
Connecting thread Fastening thread
NG A/B
D
12 G 1/2
M8, 12 deep
18 G1 M10, 15 deep
25 G1 1/2 M16, 25 deep
Dimensions
NG L1
L2 L3 L4 *L5 H1 H2 H3 H4 H5 H6 H7 B1 B2 B3
12 45 22.5 48 37 *10
130 84 46 24 106 53.5 292.3 122 140 25
18 55 27.5 60.5 27.5 *9 180 117 63 8 172 58.5 388.3 165 176.5 25.5
25 − − − − − − − − − − − − − − −
* only for valves with more than 5 modules
301-P-9050022-E-02/08.2015
H3
H1
H2
L2
L1
L3
SY, SZ
H3
H1
H2
L2
L4
L1
L3
L5
B
A
D
D
H4
H5
SD, SE SY, SZ, SD, SE
B1
B2
H6
H7
B
A
H8
H8
H9
H9
L2 L2
H10
SY, SZ
H1
L2
L4L1
L1
B
A
D
D
H2
H5
SD, SE SY, SZ, SD, SE
H3
H11
aX
bY
H11
H10
H1
H2
H3
L2
L5
B
A
H4
aX
bY
B1
B3
H12
H13
22/30
7.5 Actuator modules with type of actuation H0 (Fig. NG 12, H0O)
Connecting thread Fastening thread
NG A/B
D
12 G 1/2
M8, 12 deep
18 G1 M10, 15 deep
25 G1 1/2 M16, 25 deep
Dimensions
NG L1
L2 L3 L4 *L5 H1 H2 H3 H4 H5 H6 H7 H8 H9 B1 B2
12 45 22.5 48 37 *10
130 84 46 24 106 53.5 292.3 62 108 122 140
18 55 27.5 60.5 27.5 *9 180 117 63 8 172 58.5 388.3 84 109 165 176.5
25 − − − − − − − − − − − − − − − −
* only for valves with more than 5 modules
7.6 Actuator modules with type of actuation Y0 (Fig. NG 12)
Connecting thread Fastening thread
NG A/B aX/bY D
12 G 1/2 G 1/4
M8, 12 deep
18 G1 G 1/4 M10, 15 deep
25 G1 1/2 G 1/4 M16, 25 deep
Dimensions
NG L1
L2 L4 *L5 H1 H2 H3 H4 H5 H10 H11 H12 H13 B1 B3
12 45 22.5 37 *10
130 84 46 24 106 178.8 18.3 63.8 287.5 122 140
18 55 27.5 27.5 *9 180 117 63 8 172 237.3 13.3 59.8 347.6 165 176.5
25 75 37.5 45 *2 240 157 83 16 224 328 15 78 471 230 −
* only for valves with more than 5 modules
301-P-9050022-E-02/08.2015
SY, SZ
H1
L2
L3
L1
B
A
D
D
H2
H6
SD, SE SY, SZ, SD, SE
H3
H1
H2
H3
L2
L1
B
A
H5
L4
+H7
−H7
B1
B2
B3
H8
H9
Power socket
(not part of standard scope of delivery)
H4
SY, SZ
H1
L2
L3
L1
B
A
D
D
H2
H6
SD, SE SY, SZ, SD, SE
H3
H1
H2
H3
L2
L1
B
A
H5
L4
+H7−H7
B1B2
B3
H8
H9
H4
Power socket
(not part of standard scope of delivery)
23/30
7.7 Actuator modules with type of actuation E1/E2 (Fig. NG 12)
Connecting thread Fastening thread
NG A/B
D
12 G 1/2
M8, 12 deep
18 G1 M10, 15 deep
25 G1 1/2 M16, 25 deep
Dimensions
NG L1
L2 L3 *L4 H1 H2 H3 H4 H5 H6 H7 H8 H9 B1 B2 B3
12 45 22.5 37 *10
130 84 46 24 106 app. 234 −52 53.5 270 122 28 230
18 55 27.5 27.5 *9 180 117 63 8 172 app. 234 −27 58.5 345 165 25 270
25 75 37.5 45 *2 240 157 83 16 224 app. 234 +74.5 78 471 230 − 310
* only for valves with more than 5 modules
7.8 Actuator modules with type of actuation E7/E8 (Fig. NG 12)
Connecting thread Fastening thread
NG A/B D
12 G 1/2
M8, 12 deep
18 G1 M10, 15 deep
25 G1 1/2 M16, 25 deep
Dimensions
NG L1
L2 L3 *L4 H1 H2 H3 H4 H5 H6 H7 H8 H9 B1 B2 B3
12 45 22.5 37 *10
130 84 46 24 106 234 −52 53.5 270 122 28 230
18 55 27.5 27.5 *9 180 117 63 8 172 234 −27 58.5 345 165 25 270
25 75 37.5 45 *2 240 157 83 16 224 234 +87.5 78 471 230 − 310
* only for valves with more than 5 modules
301-P-9050022-E-02/08.2015
SY, SZ
H1
L2
L3
L1
B
A
D
D
H2
H6
SD, SE SY, SZ, SD, SE
H3
H1
H2
H3
L2
L1
BA
H5
L4
+H7
−H7
B1B2
B3
H8
H4
b
a
2
1
Orientation lug
** contact occupation 1and 2
H9
Power socket G4W1F**
(not part of standard scope of delivery)
SY, SZ
H1
L2
L3
L1
B
A
D
D
H2
H6
SD, SE SY, SZ, SD, SE
H3
H1
H2
H3
L2
L1
B
A
H5
L4
+H7
−H7
B1B2
B3
H8
H9
H4
b
a
**contact occupation 1 and 2, see page 24
Power socket G4W1F**
(not part of standard scope of delivery)
24/30
7.9 Actuator modules with type of actuation M2(M1) (Fig. NG 12)
Connecting thread Fastening thread
NG A/B
D
12 G 1/2
M8, 12 deep
18 G1 M10, 15 deep
25 G1 1/2 M16, 25 deep
Dimensions
NG L1
L2 L3 *L4 H1 H2 H3 H4 H5 H6 H7 H8 H9 B1 B2 B3
12 45 22.5 37 *10
130 84 46 24 106 270 −70 53.5 270 122 28 236
18 55 27.5 27.5 *9 180 117 63 8 172 270 −45 58.5 345 165 25 276
25 75 37.5 45 *2 240 157 83 16 224 270 +69.5 78 471 230 − 316
* only for valves with more than 5 modules
7.10 Actuator modules with type of actuation M3(M4) (Fig. NG 12)
Connecting thread Fastening thread
NG A/B
D
12 G 1/2
M8, 12 deep
18 G1 M10, 15 deep
25 G1 1/2 M16, 25 deep
Dimensions
NG L1
L2 L3 *L4 H1 H2 H3 H4 H5 H6 H7 H8 H9 B1 B2 B3
12 45 22.5 37 *10
130 84 46 24 106 281 −75.5 53.5 270 122 28 238
18 55 27.5 27.5 *9 180 117 63 8 172 281 −50.5 58.5 345 165 25 278
25 75 37.5 45 *2 240 157 83 16 224 281 +64 78 471 230 − 318
* only for valves with more than 5 modules
301-P-9050022-E-02/08.2015
SY, SZ
H1
L2
L3
L1
B
A
D
D
H2
H6
SD, SE SY, SZ, SD, SE
H3
H1
H2
H3
L2
L1
B
A
H5
L4
+H7−H7
B1B2
B3
H8
H9
H4
bY
aX
Cable length 1m
SY, SZ
H1
L2
L3
L1
B
A
D
D
H2
H6
SD, SE SY, SZ, SD, SE
H3
H1
H2
H3
L2
L1
B
A
H5
L4
+H7−H7
B1B2
H8
H9
H4
bYaX
H10
B4
B5
H13
B7
B6
a
b
+H12−H12
H11
Power socket
(not part of standard scope of delivery)
25/30
7.11 Actuator modules with type of actuation M6(M5) on request only (Fig. NG 12)
Connecting thread Fastening thread
NG A/B
D
12 G 1/2
M8, 12 deep
18 G1 M10, 15 deep
25 G1 1/2 M16, 25 deep
Dimensions
NG L1
L2 L3 *L4 H1 H2 H3 H4 H5 H6 H7 H8 H9 B1 B2 B3
12 45 22.5 37 *10
130 84 46 24 106 281 −75.5 53.5 270 122 28 227
18 55 27.5 27.5 *9 180 117 63 8 172 281 −50.5 58.5 345 165 25 267
25 75 37.5 45 *2 240 157 83 16 224 281 +64 78 471 230 − 307
* only for valves with more than 5 modules
7.12 Actuator modules with type of actuation Y1/Y2 (Fig. NG 12)
Connecting thread Fastening thread
NG A/B
aX/bY D
12 G 1/2 G 1/4
M8, 12 deep
18 G1 G 1/4 M10, 15 deep
25 G1 1/2 G 1/4 M16, 25 deep
NG B1 B2 B4 B5 B6 B7
12 122 28 40 270 179 179
18 165 25 40 310 179 179
25 230 − 40 350 259 259
Dimensions
NG L1
L2 L3 *L4 H1 H2 H3 H4 H5 H6 H7 H8 H9 H10 H11 H12 H13
12 45 22.5 37 *10
130 84 46 24 106 app. 234 −52 53.5 270 28.4 250 −60 17.5
18 55 27.5 27.5 *9 180 117 63 8 172 app. 234 −27 58.5 345 33.4 250 −35 22.5
25 75 37.5 45 *2 240 157 83 16 224 app. 234 +74.5 78 471 44.4 250 +79.5 33.5
* only for valves with more than 5 modules
301-P-9050022-E-02/08.2015
SY, SZ
H1
L2
L3L1
B
A
D
D
H2
H6
SD, SE SY, SZ, SD, SE
H3
H1
H2
H3
L2
L1
B
A
L4
+H7−H7
B1
H4
aX
B5
H13
B7
ab
+H12
−H12
H11
H5
Power socket
(not part of standard scope of delivery)
B4 B2
bY
H10
B6
H8
H9
SY, SZ
H1
L2
L3
L1
B
A
D
D
H2
H6
SD, SE SY, SZ, SD, SE
H3
H1
H2
H3
L2
L1
B
A
L4
+H7−H7
B1
H4
aX
B5
H13
B7
a
b
+H12
−H12
H11
H5
B4 B2
H10
B6
H8
H9
bY
**contact occupation 1 and 2, see page 24
Power socket G4W1F**
(not part of standard scope of delivery)
26/30
7.13 Actuator modules with type of actuation Y7/Y8 (Fig. NG 12)
Connecting thread Fastening thread
NG A/B
aX/bY D
12 G 1/2 G 1/4
M8, 12 deep
18 G1 G 1/4 M10, 15 deep
25 G1 1/2 G 1/4 M16, 25 deep
NG B1 B2 B4 B5 B6 B7
12 122 28 40 270 179 179
18 165 25 40 310 219 219
25 230 − 40 350 259 259
Dimensions
NG L1
L2 L3 *L4 H1 H2 H3 H4 H5 H6 H7 H8 H9 H10 H11 H12 H13
12 45 22.5 37 *10
130 84 46 24 106 234 −52 53.5 270 28.4 250 −60 17.5
18 55 27.5 27.5 *9 180 117 63 8 172 234 −27 58.5 345 33.4 250 −35 22.5
25 75 37.5 45 *2 240 157 83 16 224 234 +87.5 78 471 44.4 250 +79.5 33.5
* only for valves with more than 5 modules
7.14 Actuator modules with type of actuation B2(B1) (Fig. NG 12)
Connecting thread Fastening thread
NG A/B
aX/bY D
12 G 1/2 G 1/4
M8, 12 deep
18 G1 G 1/4 M10, 15 deep
25 G1 1/2 G 1/4 M16, 25 deep
NG B1 B2 B4 B5 B6 B7
12 122 28 40 276 179 179
18 165 25 40 316 219 219
25 230 − 40 356 259 259
Dimensions
NG L1
L2 L3 *L4 H1 H2 H3 H4 H5 H6 H7 H8 H9 H10 H11 H12 H13
12 45 22.5 37 *10
130 84 46 24 106 270 −70 53.5 270 28.4 250 −60 17.5
18 55 27.5 27.5 *9 180 117 63 8 172 270 −45 58.5 345 33.4 250 −35 22.5
25 75 37.5 45 *2 240 157 83 16 224 270 +69.5 78 471 44.4 250 +79.5 33.5
* only for valves with more than 5 modules
301-P-9050022-E-02/08.2015
SY, SZ
H1
L2
L3L1
B
A
D
D
H2
H6
SD, SE SY, SZ, SD, SE
H3
H1
H2
H3
L2
L1
B
A
L4
+H7
−H7
B1
H4
aX
B5
H13
B7
a
b
+H12−H12
H11
H5
B4 B2
H10
B6
H8
H9
bY
Power socket G4W1F**
(not part of standard scope of delivery)
**contact occupation 1 and 2, see page 24
SY, SZ
H1
L2
L3L1
B
A
D
D
H2
H6
SD, SE SY, SZ, SD, SE
H3
H1
H2
H3
L2
L1
B
A
L4
+H7
−H7
B1
H4
aX
B5
H13
B7
a
b
+H12−H12
H11
H5
B4 B2
H10
B6
H8
H9
bY
Cable length 1m
27/30
7.15 Actuator modules with type of actuation B3(B4) (Fig. NG 12)
Connecting thread Fastening thread
NG A/B
aX/bY D
12 G 1/2 G 1/4
M8, 12 deep
18 G1 G 1/4 M10, 15 deep
25 G1 1/2 G 1/4 M16, 25 deep
NG B1 B2 B4 B5 B6 B7
12 122 28 40 278 179 179
18 165 25 40 318 219 219
25 230 − 40 358 259 259
Dimensions
NG L1
L2 L3 *L4 H1 H2 H3 H4 H5 H6 H7 H8 H9 H10 H11 H12 H13
12 45 22.5 37 *10
130 84 46 24 106 281 −75.5 53.5 270 28.4 250 −60 17.5
18 55 27.5 27.5 *9 180 117 63 8 172 281 −50.5 58.5 345 33.4 250 −35 22.5
25 75 37.5 45 *2 240 157 83 16 224 281 +64 78 471 44.4 250 +79.5 33.5
* only for valves with more than 5 modules
7.16 Actuator modules with type of actuation B6(B5) on request only (Fig. NG 12)
Connecting thread Fastening thread
NG A/B
aX/bY D
12 G 1/2 G 1/4
M8, 12 deep
18 G1 G 1/4 M10, 15 deep
25 G1 1/2 G 1/4 M16, 25 deep
NG B1 B2 B4 B5 B6 B7
12 122 28 40 267 179 179
18 165 25 40 307 219 219
25 230 − 40 347 259 259
Dimensions
NG L1
L2 L3 *L4 H1 H2 H3 H4 H5 H6 H7 H8 H9 H10 H11 H12 H13
12 45 22.5 37 *10
130 84 46 24 106 281 −75.5 53.5 270 28.4 250 −60 17.5
18 55 27.5 27.5 *9 180 117 63 8 172 281 −50.5 58.5 345 33.4 250 −35 22.5
25 75 37.5 45 *2 240 157 83 16 224 281 +64 78 471 44.4 250 +79.5 33.5
* only for valves with more than 5 modules
301-P-9050022-E-02/08.2015
SY, SZ
H1
L2
L1
L1
B
A
H2
H6
SD, SE SY, SZ, SD, SE
H3
H1
H2
H3
L2
L4
B1
B3
B2
H8
H9
L3
L3
L5
D
D
H5
H4
B
A
H7
Power socket
(not part of standard
scope of delivery)
SY, SZ
H1
L2
L1
L1
B
A
H2
H6
SD, SE SY, SZ, SD, SE
H3
H1
H2
H3
L2
L4
B1
B3
B2
H8
H9
L3
L3
L5
D
D
H5
H4
BA
H7
Power socket G4W1F**
(not part of standard
scope of delivery)
**contact occupation 1 and 2, see page 24
28/30
7.17 Actuator modules with type of actuation K1/K2 (Fig. NG 12, K10/K20)
Connecting thread Fastening thread
NG A/B
D
12 G 1/2
M8, 12 deep
18 G1 M10, 15 deep
25 G1 1/2 M16, 25 deep
Dimensions
NG L1
L2 L3 L4 *L5 H1 H2 H3 H4 H5 H6 H7 H8 H9 B1 B2 B3
12 45 22.5 48 37 *10
130 84 46 24 106 247 58.5 53.5 292.3 122 28 230
18 55 27.5 60.5 27.5 *9 180 117 63 8 172 247 33.5 58.5 388.3 165 25 270
25 − − − − − − − − − − − − − − − − −
* only for valves with more than 5 modules
7.18 Actuator modules with type of actuation K8(K5) on request only (Fig. NG 12, K80(K50))
Connecting thread Fastening thread
NG A/B
D
12 G 1/2
M8, 12 deep
18 G1 M10, 15 deep
25 G1 1/2 M16, 25 deep
Dimensions
NG L1
L2 L3 L4 *L5 H1 H2 H3 H4 H5 H6 H7 H8 H9 B1 B2 B3
12 45 22.5 48 37 *10
130 84 46 24 106 270 70 53.5 292.3 122 28 236
18 55 27.5 60.5 27.5 *9 180 117 63 8 172 270 45 58.5 388.3 165 25 316
25 − − − − − − − − − − − − − − − − −
* only for valves with more than 5 modules
301-P-9050022-E-02/08.2015
SY, SZ
H1
L2
L1
L1
H2
H6
H3
H1
H2
H3
L2
L4
B1
B3
B2
H8
H9
L3
L3
L5
D
D
H5
H4
B
A
H7
Power socket G4W1F**
(not part of standard
scope of delivery)
SD, SE SY, SZ, SD , SE
B
A
**contact occupation 1 and 2, see page 24
SY, SZ
H1
L2
L1
L1
B
A
H2
H6
SD, SE
H3
H1
H2
H3
L2
L4
B1
B3
B2
H8
H9
L3
L3
L5
D
D
H5
H4
B
A
H7
Cable length 1m
SY, SZ, SD, SE
29/30
7.19 Actuator modules with type of actuation K9(K6) (Fig. NG 12, K90(K60))
Connecting thread Fastening thread
NG A/B
D
12 G 1/2
M8, 12 deep
18 G1 M10, 15 deep
25 G1 1/2 M16, 25 deep
Dimensions
NG L1
L2 L3 L4 *L5 H1 H2 H3 H4 H5 H6 H7 H8 H9 B1 B2 B3
12 45 22.5 48 37 *10
130 84 46 24 106 281 78.5 53.5 292.3 122 28 238
18 55 27.5 60.5 27.5 *9 180 117 63 8 172 281 50.5 58.5 388.3 165 25 278
25 − − − − − − − − − − − − − − − − −
* only for valves with more than 5 modules
7.20 Actuator modules with type of actuation K0(K7) (Fig. NG 12, K00(K70))
Connecting thread Fastening thread
NG A/B
D
12 G 1/2
M8, 12 deep
18 G1 M10, 15 deep
25 G1 1/2 M16, 25 deep
Dimensions
NG L1
L2 L3 L4 *L5 H1 H2 H3 H4 H5 H6 H7 H8 H9 B1 B2 B3
12 45 22.5 48 37 *10
130 84 46 24 106 281 75.5 53.5 292.3 122 28 277
18 55 27.5 60.5 27.5 *9 180 117 63 8 172 281 50.5 58.5 388.3 165 25 267
25 − − − − − − − − − − − − − − − − −
* only for valves with more than 5 modules
301-P-9050022-E-02/08.2015
30/30
Germany
Phone +49 7742 85 20
Fax +49 7742 71 16
info.de@bucherhydraulics.com
BUCHER HYDRAULICS www.bucherhydraulics.com
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We reserve the right of modification without notice.
301-P-9050022-E-02/08.2015
