41 640/117 ED
OPERATING PRINCIPLE
DSB*
SELF-REVERSING VALVE
SERIES 10
1/6
41 640/117 ED
MOUNTING SURFACES
DSB3 ISO 4401-03
DSB5 ISO 4401-05
p max (see performances table)
Q nom (see performances table)
— The DSB* are directional control valves with self-reversing spool
and mounting interface according to ISO 4401-03 and 4401-05
standards.
— The valves realize the reciprocation of the flow direction when the
flowrate stops in A or B line (f.e., when a cylinder reaches the end
stroke). The reversing process is independent of the line pressure.
DSB3
DSB5
Ma
xi
m
um
op
e
ra
t
i
n
g
p
re
ssu
re
on
po
rt
P
bar
350
320
Mi
ni
mu
m
a
ll
owed
p
ressu
re
bar
50
60
Ma
xi
m
um
f
lo
w rat
e
l/min
30
100
Mi
ni
mu
m
a
ll
owed
f
l
o
w
ra
te
l/min
3
10
Am
b
i
e
n
t
te
m
pe
rat
ure
ra
n
g
e
°C
-20 / +60
Flu
id
t
em
p
e
rat
ure ra
n
ge
°C -20 / +80
Fluid viscosity range
cSt
10 ÷ 400
Recommended viscosity
cSt
25
Fluid contamination degree
according to ISO 4406:1999 class 20/18/15
Mass
kg
0,9
2,8
Surface finishing
zinc-nickel surface treatment
PERFORMANCES
(measured with mineral oil of viscosity 36 cSt at 50°C)
HYDRAULIC SYMBOL
2 - PRESSURE DROPS ∆p-Q
(values obtained with viscosity 36 cSt at 50 °C)
1 - IDENTIFICATION CODE
With self reversing spool
Size:
3 = ISO 4401-03
5 = ISO 4401-05
Spool type
Seals:
N = NBR seals for mineral oil (standard)
V = FPM seals for special fluids
Series No.:
(the overall and mounting dimensions remain
unchanged from 10 to 19)
Directional control
valve with spool
D S B - RTA / 10
3 - HYDRAULIC FLUIDS
Use mineral oil-based hydraulic fluids HL or HM type, according to ISO 6743-4. For these fluids, use NBR seals. For fluids HFDR type
(phosphate esters) use FPM seals (code V). For the use of other kinds of fluid such as HFA, HFB, HFC, please consult our technical
department.
Using fluids at temperatures higher than 80 °C causes a faster degradation of the fluid and of the seals characteristics. The fluid must be
preserved in its physical and chemical characteristics.
DSB*
SERIES 10
2/6
41 640/117 ED
DSB5
DSB3
/
Manual override:
CK = knob manual override for
the adjustment of the relief valve
(see paragraph 6)
DSB*
SERIES 10
3/6
41 640/117 ED
5 - OVERALL AND MOUNTING DIMENSIONS DSB3
dimensions in mm
1 Mounting surface with sealing rings:
N. 4 OR type 2037 (9.25x1.78)
90 shore
Valve fastening: N. 4 bolts SHC M5x30 - ISO 4762
Tightening torque: 5 Nm (bolts A 8.8)
Threads of mounting holes: M5x10
0.750.75
TT
BB
31.7531.75
PP
AA
25.925.9
15.515.5
5.15.1
12.712.7
3131
M5M5
ø4ø 4
ø7.5(max)ø7.5(max)
21.521.5
30.230.2
40.540.5
3333
MOUNTING INTERFACE
ISO 4401-03-02-0-05
(CETOP 4.2-4-03-350)
41 640/117 ED
4/6
DSB*
SERIES 10
5 - OVERALL AND MOUNTING DIMENSIONS DSB5
6 - KNOB MANUAL OVERRIDE
The knob manual override CK allows to set the pressure of the relief valve without using shut-off valves.
50.8
37.3
27
3.2
16.7
54
M6x10
facoltativo
Attacco"T"
B
A
P
T
Ø11.2(max)
46
32.5
21.4
6.3
I
SO 4401-05-04-0-05
(CETOP 4.2-4-05-320)
MOUNTING INTERFACE
optional
“T” port
1 Mounting surface with sealing rings:
N. 5 OR type 2050 (12.42x1.78)
90 shore
Valve fastening: N. 4 bolts SHC M6x40 - ISO 4762
Tightening torque: 8 Nm (bolts A 8.8)
Threads of mounting holes: M6x10
dimensions in mm
CK for DSB5
CK for DSB3
Allen key for set screw: 2,5 mm Allen key for set screw: 3 mm
41 640/117 ED
5/6
DSB*
SERIES 10
7 - INSTALLATION
The valves can be mounted in any position. Valve fixing is by means of screws or tie rods, with the
valve mounted on a lapped surface, with values of planarity and smoothness that are equal to or
better than those indicated in the drawing.
If the minimum values of planarity and/or smoothness are not met, fluid leakage between valve and
mounting surface can easily occur.
We suggest to use the circuits shown, connecting the A port with the rear chamber of the cylinder. In
this way, with the start of the pump, the valve places itself, so as to retract the rod. To work properly
the valve needs an area ratio of the cylinder chambers included between 1:1,25 and 1:2.
7.1 - Standard valve
To set the system relief valve correctly, the self-reversing function must be
inactive.
To do so, close the shut-off valve, start the pump, set the pressure relief valve
and stop the pump. Then, open the shut-off valve and restart the pump.
7.2 - Valve with knob manual override
To set the system relief valve correctly, the self-reversing function must be
inactive.
To do so, completely unscrew the set screw then tighten the knob until it is at
mechanical stop. The spool is now clamped in position P → B and A → T. Start
the pump, set the pressure of the relief valve and then stop the pump. Re-
establish the working conditions of the valve, unscrewing almost completely the
knob and screwing the set screw, until its point is aligned with the edge of the
knob.
The valve is in normal working conditions when the knob is tightened and the
point of the set screw is aligned with the edge of the knob.
Do not use the manual override when the valve is on: if it is
necessary stop the pump.
Qualitàdellasuperficie
0.8
0.01/100
Surface finishing
41 640/117 ED
6/6
DSB*
SERIES 10
REPRODUCTION IS FORBIDDEN. THE COMPANY RESERVES THE RIGHT TO APPLY ANY MODIFICATIONS.
DSB3 DSB5
Type with rear ports PMMD-AI3G PMD4-AI4G - 3/4” BSP threaded
Type with side ports PMMD-AL3G PMD4-AL4G - 1/2” BSP threaded
Threading of ports P, T, A, B 3/8” BSP -
8 - SUBPLATES (see catalogue 51 000)