Leak-Free Load-Control Valves size 40
Q
max
= 1300l/min [340 gpm],p
max
= 420bar [6000 psi]
Seat-valve, two-stage hydraulic, cartridge design
Series CINDY 40-B-C...
1/16
Reference: 300-P-9050099-EN-10
Issue: 11.2023
S Two-stage load-control valve and bypass check valve
are functionally combined in one coaxial valve assembly
S Leak-free load holding
S Pilot ratio 113:1
S The control assembly is guaranteed to close
it closes even with a broken spring
S Various pilot-pressure ranges can be chosen
S All exposed parts with zinc-nickel plating
S Various types of pilot control, matched to your system,
can be supplied
S Low-noise operation thanks to specially shaped control
grooves
1 Description
Whenever large loads are to be precisely moved, placed
and held, or work access platforms must maintain their posi
tion and withstand high forces, then leak-free load-control
valves from the CINDY series are the right solution.
Load-control valves in this series prevent hydraulic actua
tors from running ahead of the available oil supply. In one
valve, they combine the functions of load-holding, safety
and pipe-rupture protection. Leak-free load-control valves
in this series are ideally suited for use in high-pressure appli
cations up to 420 bar (6000 psi). With a variety of optional
components, the series can be extended and adapted to
the requirements of the system.
2 Symbol
Variant A
Influenced by return-line pressure
(pressure in A is additive to opening pilot pressure).
Variant L
Not influenced by return-line pressure
(drain line is required).
A
B
X
A
B
X
L
siehe Ansteuerungsvarianten
see types of pilot control
siehe Ansteuerungsvarianten
see types of pilot control
300-P-9050099-EN-10/11.2023
Series CINDY
2/16
3 Technical data
General characteristics Description, value, unit
Designation Leak-free load-control valve
Design Seat-valve, two-stage hydraulic, cartridge design
Size Size 40
Mounting method Factory standards
1x cylinder screw with internal hexagon M10x22
DIN EN ISO 4762, – grade 12.9
Actuator / drive ports A, B
Pilot ports (internal variant) X
(external variant) X
Drain ports L
∅ 38 mm [∅ 1.49 inch] (factory standards)
∅ 4 mm [∅ 0.15 inch] (factory standards)
G ¼“, ISO 1179-1
∅ 4 mm [∅ 0.15 inch] (factory standards)
Weight 4.5 … 4.8 kg [9.92…17.63 lbs]
Mounting attitude unrestricted
Ambient temperature range -25°C … +100°C [-13 °F … +212 °F]
(others on application)
Surface corrosion protection Outside parts: Zinc-nickel coating
Mounting screws zinc-flake coated
(e.g. with Geomet® finish)
Hydraulic characteristics Description, value, unit
Maximum pressure at the flow- or return port A 420 bar [6000 psi]
Maximum pressure at the actuator- / load port B 420 bar [6000 psi]
Maximum pressure at the pilot port X 420 bar [6000 psi]
(restrictions possible - see section types
of pilot control 4.4)
Maximum flow rate 1300 l/min [340 gpm]
(higher flow rates on application)
Flow direction A → B, free flow through check valve
B → A, controlled flow
Operator type hydraulic proportional or electro proportional
Opening pilot ratio 113:1
Hydraulic fluid HL and HLP mineral oil to DIN 51 524;
for other fluids, please contact BUCHER
Hydraulic fluid temperature range -25°C … +80°C [-13 °F … +176 °F]
Temperature rating of seals NBR
FKM
MIL
-25°C… +100°C [-13 °F … +212 °F]
-20°C … +200°C [-4 °F … +392 °F]
-55°C … +80°C [-67 °F … +176 °F]
Viscosity range 2.8…1500 mm
2
/s (cSt), recommended 10…380 mm
2
/s (cSt)
Minimum fluid cleanliness
Cleanliness class to ISO 4406:1999
class 20/17/14
300-P-9050099-EN-10/11.2023
Series CINDY
3/16
4 Construction and function
The functions of the control assembly are subdivided into
the following positions:
4.1 Neutral position
The load pressure and the compression spring act on the
control spool in the closing direction. The valve is closed
with no leakage.
4.2 Lifting (flow direction from A → B)
The pump pressure at port A opens the valve against the
“light” compression spring and the load. The pilot spool and
control spool move together in the opening direction. Oil
flows from A → B and the valve functions as a check valve.
4.3 Lowering (flow direction from B → A)
The pilot pressure at port X acts on the pilot piston and
against the control springs. The pilot spool opens. As a re
sult, the load pressure B is discharged to port A via the me
tering grooves in the pilot spool. The progressive character
istic of the pre-opening phase ensures that lowering begins
smoothly and without jerks.
If the pilot pressure at port X is increased, the pilot spool
opens further. The change in the pressure conditions at the
control spool means that it follows the pilot spool in the
opening direction. The oil flows from B → A.
Neutral position Lifting (A → B) Lowering (B → A)
(Symbol for 4.1) (Symbol for 4.2) (Symbol for 4.3)
M
M M
300-P-9050099-EN-10/11.2023
Series CINDY
4/16
4.4 Types of pilot control
Cover types /
applications
Type “G“ Type “D“ Type “K“ Type “H“ Type “R“ Type “E“
Cylinder application
(external pilot signal)
✓✓ ✓ ✓ ✓✓
Cylinder application
(pilot signal from opposite line)
✓✓
Motors / Winches ✓✓
Motors for slewing
drives
✓✓
Explanation of symbols: ✓✓ = normal ✓ = possible  = not possible
4.4.1 Standard damping cover, type “G“
Pilot control type “G“ is recommended for external control,
or with low-oscillation applications. This control cover can
only be damped with an inlet orifice. Stroke-dependent
damping is not possible with this cover.
ZD
BY
L (A)
X
4.4.2 Stroke-dependent damping cover, type “D“
The type “D“ cover is recommended for handling pilot sig
nals that come from the opposite actuator line and for appli
cations that are susceptible to oscillations. Thanks to the pi
lot piston's stroke-dependent damping system, oscillation-
prone applications can be started in a very stable manner.
The starting pressure peak is reduced because in the start
ing zone the valve responds quickly to the pilot signal.
ZD
DD1
DD2
BY
L (A)
X
4.4.3 Stroke-dependent damping cover with
metering grooves, type “K“
The stroke-dependent damping cover with metering
grooves, type “K“, is recommended for applications that are
susceptible to oscillations, such as hydraulic motors
(e.g. winches).
ZD
BY
L (A) (“DD1“) L
X
4.4.4 Hydromechanical stroke-limiting cover,
type “H“
With the type “H“ pilot control, the stroke of the load-control
spool can be limited from outside the valve to achieve a par
ticular flow rate or speed. This reduces the valve resolution.
300-P-9050099-EN-10/11.2023
Series CINDY
5/16
4.4.5 Hydraulic pressure-reducing valve cover
type “R“
Pilot control type “R“ denotes the version in which the in
coming pilot pressure is reduced to a preset level. This func
tion is needed when working with compensated and over-
compensated applications, and the actual pilot pressure in
the pilot chamber must not exceed 19 bar. The small leak
age flow from the pressure reducing valve is discharged
through an internal drain connection. The maximum allow
able inlet pressure at port X is 100 bar. Because compen
sated and over-compensated systems must always be ex
ternally controlled, an inlet orifice is not normally required.
IMPORTANT!: Only available in return pressure
independent version (L).
BY
X
L
ZD
300-P-9050099-EN-10/11.2023
Series CINDY
6/16
4.4.6 Electroproportional pressure-reducing valve cover
type “E“
The type “E“ control can be used for electroproportional
control. In this case, the inlet signal at port X is reduced to
a level proportional to the applied control current. The small
flow of pilot oil from the pressure reducing valve is led away
through an internal drain connection or a separate drain
port. This control type is only intended for external pilot oil
supplies, and it is essential to use a back-pressure-inde
pendent body (L).
Hydraulic characteristics Description, value, unit
Pilot-oil supply at X min. 30 bar [min. 435 psi]
max. 350 bar [max. 5000 psi] *
Permissible tank pressure at L (static) max. 5 bar [max. 70 psi]
Flow rate (pump) available at X min. 2 l/min [min. 0.5 gpm]
Pilot-oil consumption / Leakage flow rate < 0.1 l/min (I = 0) [< 0.026 gpm (I = 0)]
< 0.5 l/min (I = max) [< 0.125 gpm (I = max)]
Hysteresis (with PWM control; pulse frequency 100 Hz) 0.5 bar [7.1 psi]
Pilot-pressure control range 0…20 bar [0…285 psi] *
* Other values on request
Electrical characteristics Description, value, unit
Nominal voltage 12 V DC 24 V DC
Resistance R 20 5.3 Ω ± 5 % 21.2 Ω ± 5 %
Maximum current at 100% duty cycle 1500 mA 750 mA
Power consumption at operating temperature
(with increased resistance)
18 W 18 W
Control current at start of opening ~ 600 mA ~ 300 mA
Control current when fully open ~ 1400 mA ~ 700 mA
Relative duty cycle 100%
Insulation class 180 °C (VDE 0580:H) [356 °F]
Protection class IP 65 (DIN VDE 0470)
Connector plug type AMP Junior Timer
Deutsch Plug DT04-2P
IMPORTANT!: Only available in return pressure
independent version (L).
General:
The series-connection of the orifices allows the opening time, the closing time, the start of opening, and the full extent of open
ing to be matched to the requirements of the application.
300-P-9050099-EN-10/11.2023
Series CINDY
7/16
5 Performance graphs
measured with oil viscosity 33mm
2
/s (cSt)
Dp = f (Q) Pressure drop - Flow rate characteristic
Lifting A → B
(through cartridge valve only)
300−PG−0026
4
8
16
12
Q [l/min (gpm)]
(105) (160) (210) (265)(52)
0
(psi)]
400 600 800 1000200
0
(60)
(120)
(230)
(170)
V400
V500
V630
V1000
S1300
V800
Dp = f (Q) Pressure drop - Flow rate characteristic
Lowering B → A
(through cartridge valve only)
300−PG−0025
10
20
40
30
Q [l/min (gpm)]
(105) (160) (210) (265)(52)
0
(psi)]
400 600 800 1000200
0
(140)
(285)
(570)
(430)
V400
V500
V630
V800
V1000
S1300
6 Available modules
6.1 Pilot oil connection (X) internal via mounting hole
300-P-9050099-EN-10/11.2023
Series CINDY
8/16
6.2 Pilot oil connection (X) external piped via cover
300-P-9050099-EN-10/11.2023
Series CINDY
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7 Dimensions & sectional view
7.1 Body and control variants for control oil connection (X) internal via mounting hole
XA B
16
[.629]
6 [.236]
201
[7.91]
189.5
[7.46]
Ø70
[Ø2.75]
11
[0.43]
Deckel
M10
L
A−A
A−A
26.5
[1.04]
12.5
[.492]
8.5
[.334]
52.5
[2.06]
44
[1.73]
40
[1.57]
87.5
[3.44]
Cover
16
[.629]
Angriffsfläche zum Demontieren
Area for disassembling

Angriffsflächen zum Montieren und Demontieren
Areas for assembling and disassembling
裝配
Serien Nr.
Serial no.
號。
50
[1.96]
28
[1.10]
t = 79.5
[t = 3.12]
62
[2.44]
50
[1.96]
16.5
[.649]
75
[2.95]
4.5
[.17]
23
[.354]
50
[1.96]
45
[1.77]
16.5 *
[.649]*
22 *
[.866]*
max. 27.2
max. [1.07]
50
[1.96]
50
[1.96]
45
[1.77]
max. 27.2
max. [1.07]
31
[1.22]
2
[.07]
60
[2.36]
63.5
[2.5]
3.5
[.13]
63.5
[2.5]
3.5
[.13]
Beispiel für die Masseinheit:
Example for the dimensional units:
尺寸 位
例:
0.79 = 0.79 mm millimeter
[.031] = 0.031 ˝ inch
Standarddämpfungsdeckel Typ ’’G’’
Standard damping cover type ’’G’’
’’G’’
Hubabhängiger Dämpfungsdeckel Typ ’’D’’
Stroke−dependent damping cover type ’’D’’
’’D’’
Hubabhängiger Kerbendämpfungsdeckel Typ ’’K’’
Stroke−dependent damping cover with metering grooves type ’’K’’
’’K’’
* = werkseitige Einstellung
* = factory setting
* =
Hydromechanischer Hubbegrenzungsdeckel Typ ’’H’’
Hydromechanical stroke−limiting cover type ’’H’’
’’H’’
* = werkseitige Einstellung
* = factory setting
* =
Elektronischer proportional Druckminderventilteckel Typ ’’E’’
Electronic proportional pressure reducing valve cover type ’’E’’
’’E’’
ATTENTION!:
The force for assembling or disassembling the
load control valve, should only be applied on the
designated faces or threads.
Assemble or disassemble by hits on the load con
trol valve is not allowed – Danger of loosing pres
sure loaded parts!
300-P-9050099-EN-10/11.2023
Series CINDY
10/16
7.2 Body and control variants for pilot oil connection (X) externally pipped via cover
AB
16
[.629]
6 [.236]
201
[7.91]
189.5
[7.46]
Ø70
[Ø2.75]
11
[0.43]
Deckel
M10
L
A−A
A−A
26.5
[1.04]
12.5
[.492]
8.5
[.334]
52.5
[2.06]
44
[1.73]
40
[1.57]
87.5
[3.44]
Cover
16
[.629]
Angriffsfläche zum Demontieren
Area for disassembling

Angriffsflächen zum Montieren und Demontieren
Areas for assembling and disassembling
裝配
Serien Nr.
Serial no.
號。
33.5
[1.39]
14
[.55]
55
[2.16]
25
[.98]
45
[1.77]
max. 27.2
[max. 1.07]
50
[1.96]
50
[1.96]
max. 27.2
[max. 1.07]
45
[1.77]
25
[.98]
16.5 *
[.64 *]
50
[1.96]
40
[1.57]
4.5
[.17]
22.5
[.88]
45
[1.77]
24
[.94]
62
[2.44]
50.3
[1.98]
t=84
[t=3.30]
50
[1.96]
27.5
[1.08]
21.5
[.84]
55
[2.16]
3.5
[.13]
21.5
[.84]
55
[2.16]
3.5
[.13]
45.1
[1.77]
55
[2.16]
21.5
[.84]
21.5
[.84]
58
[2.28]
4.5
[.17]
22
[.86]
25
[.98]
25
[.98]
25
[.98]
25
[.98]
Beispiel für die Masseinheit:
Example for the dimensional units:
尺寸 位
例:
0.79 = 0.79 mm millimeter
[.031] = 0.031 ˝ inch
Standarddämpfungsdeckel Typ ’’G’’
Standard damping cover type ’’G’’
’’G’’
Hubabhängiger Dämpfungsdeckel Typ ’’D’’
Stroke−dependent damping cover type ’’D’’
’’D’’
Hubabhängiger Kerbendämpfungsdeckel Typ ’’K’’
Stroke−dependent damping cover with metering grooves type ’’K’’
’’K’’
* = werkseitige Einstellung
* = factory setting
* =
Hydromechanischer Hubbegrenzungsdeckel Typ ’’H’’
Hydromechanical stroke−limiting cover type ’’H’’
’’H’’
* = werkseitige Einstellung
* = factory setting
* =
Elektronischer proportional Druckminderventilteckel Typ ’’E’’
Electronic proportional pressure reducing valve cover type ’’E’’
’’E’’
Hydraulischer Druckminderventildeckel Typ ’’R’’
Hydraulic pressure−reducing valve cover type ’’R’’
’’R’’
ATTENTION!:
The force for assembling or disassembling the
load control valve, should only be applied on the
designated faces or threads.
Assemble or disassemble by hits on the load con
trol valve is not allowed – Danger of loosing pres
sure loaded parts!
300-P-9050099-EN-10/11.2023
Series CINDY
11/16
7.3 Cavity type
With the external pilot oil connection (X) variant, the bore X (Ø4) incl. recess can be omitted.
With the version A (influenced by return-line pressure), the bore L (Ø4) incl. recess can be omitted.
Ø38 **
16.5
Ø4
(2.5)
2.5
Ra 1,6
Ra 1,6
Ra 1,6
(2.5)
min. 190
Ø38 **
35.5
Ø4
(2.5)
(2.5)
bis min. Ø108
up to min. Ø108
0.05 A
Ra 1,6
A
0.015
−0.1
−0.15
−0.1
−0.15
−0.1
−0.15
−0.1
−0.15
−0.1
−0.15
Ø80 **
Ø80 **
M10
22
18
−0.1
−0.15
−0.1
−0.15
−0.1
−0.15
−0.1
−0.15
(Ø71.82)
(Ø71.82)
2.52.52.5
2.5
Ra 1,6
Ra 1,6
Ra 1,6
min. 194
min. 205
min. 190 (Ø70 )
Ø4
Ø70
0
−2
Ø4
Einstich für X−Anschluss
Recess for X−connection
Einstich für L−Anschluss
Recess for L−connection
Detail Y
Schnitt A−A
Cut A−A
Y
LB
AX
BB
A
A
Schnitt B−B
Cut B−B
XA
BL
muss mit einer Bohrung Ø4
verbunden werden!
must be connected to atmosphere
by a hole of Ø4, either in axial or radial direction!
Mit ** markierte Mass sind empfohlene Masse.
Abweichungen gegenüber der Empfehlung haben gegebenenfalls
Einfluss auf die hydraulischen Kennwerte. Die Kennlinien im Datenblatt
Auslegung des Blockes bezüglich Materialauswahl und allgemeine
All dimensions marked with ** are recommended dimensions.
Deviations from the recommendation may have an influence on the
block, regarding choice of materials and its general strength are beyond
the scope of responsibility of Bucher Hydraulics.
V
ariante 1
Variant no. 1
Variante 2
(übrige Masse –
siehe Variante 1)
Variant no. 2
(all other dimensions
– see variant no. 1)
Bucher Hydraulics.
Schnitt A−A
Cut A−A
Massstab 5:1
Scale 5:1
 Ø108
A−A
1
B−B
規模 5:1
2
(其它所有尺寸
1)
A−A
Ø70
**。
 !"#$響。
%&表'!()*+,表-./量#。
關,01選23456789:設計超;<Bucher Hydraulics責=>?。
300-P-9050099-EN-10/11.2023
Series CINDY
12/16
8 Options
8.1 Load-pressure-overcompensated model
This version with compensation orifice (KD) is recom
mended for long boom systems, e.g. the telescopic booms
of mobile cranes. The compensation, alternatively the over
compensation, has the effect of limiting the speed as the
load pressure increases, and this in turn raises machine
safety levels.
During the lowering function B → A (with a maximum pilot
pressure of 19.8 bar), the cylinder's retraction speed is influ
enced by the compensation orifice KD. In spite of the con
stantly changing kinematics and the resulting increase in
the load pressure, the lowering speed:
S is held almost constant even without a compensation ori
fice (standard model)
S is reduced with a compensation orifice (overcompen
sated model)
The compensation orifice in the pilot spool has the effect
that, as the load pressure increases, the pressure acting on
the control spool in the closing direction also rises. As a re
sult, the control spool throttles the B → A flow area. To en
sure that this function operates properly, these valve types
must always be externally piloted.
ATTENTION!:
A prerequisite is that the pilot pressure acting on
the pilot piston is limited to max 19.8 bar. A higher
pressure will prevent the speed-limiting function
from working.
IMPORTANT!:
To ensure that this function operates properly, the
back-pressure-independent variant L should be
used.
Characteristic curves (examples)
0
max.
X
1007550250
[bar]
P0047.ai
[%]
Y
3 2 1
X Flow B → A
Y6 Load pressure
1 Load-pressure-compensated model (without
compensation orifice, KD)
2 Approx. 25% overcompensated (KD Ø 1.8)
3 Approx. 50% overcompensated (KD Ø 1.5)
300-P-9050099-EN-10/11.2023
Series CINDY
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9 Safety instructions
IMPORTANT!:
Designing load-control valves requires specialist
technical knowledge and product knowledge.
Safety applications must be verified by adequate
tests to ensure safety in actual use.
9.1 Assembly / disassembly
IMPORTANT!:
The valve may only be used for its intended pur
pose within its nominal rating. If you plan to use it
outside the nominal rating, you must contact the
valve manufacturer.
The ultimate responsibility for safety in the instal
lation and use rests with the endmachine manu
facturer of the mobile application.
IMPORTANT!:
Seal kit with the external seals is available on ap
plication.
IMPORTANT!:
The port threads conform to DIN 3852-2.
Use screws to DIN EN ISO 4762, grade 12.9, to
mount the valve.
Tightening torques as per the manufacturer's
instructions. These can be found on our website:
www.bucherhydraulics.com
(LOGIntern area; registration required)
IMPORTANT!:
Protect seals and flange faces from damage.
The mating flange face must be of the quality
specified in the data sheet!
Pay attention to the port designations.
300-P-9050099-EN-10/11.2023
Series CINDY
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10 Application examples
10.1 Cylinder application
10.2 Motor application
RECOMMENDATION
* Mechanical brake, externally controlled for
reduced lowering pressures in the supply
line of the motor.
** Anti-cavitation check valve for additional
safety.
ATTENTION!:
Cavitation danger!
Control from the opposite line:
To open the valve, we recommend control from
the opposite line. This method ensures that the
actuator cannot run ahead of the incoming flow.
Brake release
(unlocking the mechanical brake):
The mechanical brake must be released before
the load-control valve for winches is opened. This
prevents draining of the return line to the main
spool before the valve opens, thus preventing
load fall.
300-P-9050099-EN-10/11.2023
Series CINDY
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11 Ordering code
CINDY = series
40 = size 40
B = model / version
C = cartridge design
N = NBR (Nitrile) seals (standard)
V = FKM (Viton) seals
T = MIL (low temperature) seals
D = Geomet (zinc flake) mtg. screw M10x22-12.9
V0400 = progressive-spool, lowering flow rate 400 l/min [105 gpm] *
V0500 = progressive-spool, lowering flow rate 500 l/min [132 gpm] *
V0630 = progressive-spool, lowering flow rate 630 l/min [167 gpm] *
V0800 = progressive-spool, lowering flow rate 800 l/min [212 gpm] *
V1000 = progressive-spool, lowering flow rate 1000 l/min [265 gpm] *
S1300 = standard-spool, lowering flow rate 1300 l/min [340 gpm] *
A = influenced by return-line pressure in A
L = not influenced by return-line pressure
G… = standard cover
D… = stroke-dependent damping cover
K… = stroke-dependent damping cover with metering grooves
H… = hydromechanical stroke-limiting cover
R… = hydraulic pressure-reducing valve cover
1)
E… = electroproportional pressure-reducing valve cover
1)
... = orifice combination (is factory-defined)
I = internal: pilot oil connection (X) via mounting hole
E = external: pilot oil connection (X) pipped via cover
(blank) = without load pressure overcompensation
25 = with load pressure overcompensation 25% / compensation orifice KD Ø 1.8
50 = with load pressure overcompensation 50% / compensation orifice KD Ø 1.5
52 = with load pressure overcompensation 52% / compensation orifice KD Ø 1.4
54 = with load pressure overcompensation 54% / compensation orifice KD Ø 1.3
24DI = data for “E” cover only: AMP Junior Timer, 24 VDC (standard)
12DI = data for “E” cover only: AMP Junior Timer, 12 VDC
24DT = data for “E” cover only: Deutsch plug DT04-2P, 24 VDC
12DT = data for “E” cover only: Deutsch plug DT04-2P, 12 VDC
A
__
G…
–
–
V0400
––
NC
–
B
40
–
CINDY
D
–
I
–
__
e.g.
…
–
*) at 33 bar [478 psi] Dp from B → A
other lowering flow rates on application.
1)
Only available in return pressure independent version (L).
300-P-9050099-EN-10/11.2023
Series CINDY
16/16
12 Related data sheets
Reference Description
300-D-9050098 Project Engineering & User Information, Series CINDY,
SAE-flange, manifold and cartridge design
300-D-9050102 Technical design sheet for CINDY load-control valves in
cylinder applications
300-S-9050030 Spare Parts Information, Series CINDY as cartridge design
IMPORTANT!:
Additional documentation and 3D models
(.stp or .igs format) can be downloaded from
www.bucherhydraulics.com
(LOGintern area; registration is necessary)
We also offer customised solutions.
Please talk to our sales team.
E 2023 by Bucher Hydraulics AG, CH-6345 Neuheim
www.bucherhydraulics.cominfo.ch@bucherhydraulics.com
All rights reserved.
Data is provided for the purpose of product description only, and must not be construed as warranted characteristics in the legal sense. The
information does not relieve users from the duty of conducting their own evaluations and tests. Because the products are subject to continual
improvement, we reserve the right to amend the product specifications contained in this catalogue.
Classification: 430.325.355.330325