EN 5.191.1.0/06.20
1
Pressure compensator
spool type, direct-acting
with integrated PR function
normally closed
Cartridge valve – 350 bar
DWM12121ZD
up to 120 l/min
up to 350 bar
The pressure compensator is a direct-
acting, normally closed, spring-loaded,
spool type needle valve which operates
smoothly.
It's task is to keep a set ow rate constant
independently of any pressure uctuations.
As a control valve used in combination with
the spring, it maintains the pressure drop at
a constant level using the measuring throttle
(inow to consumer).
The ow rate remains constant by using an
identical measuring throttle area.
The pressure compensator thus becomes
a 3-way ow regulator in conjunction with a
needle valve. If the load pressure decreases
to the tank pressure in load-sensing circuits
(all consumers discharged to tank), the
pressure compensator opens the by-pass to
the tank (unloading circuit).
The pressure compensator can be used e.g.
for raising variable loads at the same speed.
The particular advantage of the pressure
compensator is an integrated pressure relief
valve, which limits the maximum system
pressure and thus saves on an additional
valve with cavity. (If the load pressure
exceeds the set value at port 3, the valve
opens and discharges the pump’s ow to
tank port 2).
FEATURES
z Used as a load-sensing valve to control the ow rate of consumers independently
of the pressure
z Integrated pressure relief function replaces an additional PR valve
z Versions available for various control pressure dierences
z Excellent stability throughout pressure and ow range
z Excellent dynamic performance
z Reliable operation due to integrated stroke limitation
z Exposed surfaces zinc-nickel plated for increased corrosion protection
(1000 h Salt spray test)
z Optional with (-3X) and without (-2X) relief bore available
Detached representation of symbols:
Type -2X Type -3X
FUNCTION
SPECIFICATIONS*
Operating pressure: max. 350 bar
Pressure ranges: 60, 125, 230, 350 bar
Flow rate: max. 120 l/min
Control pressure dierential ranges: 03, 05, 06, 08, 10, 13, 14 bar
Media operating temperature range: min. -30°C to max. +100°C
Ambient temperature range: min. -30°C to max. +100°C
Operating uid: Hydraulic oil acc. to DIN 51524
Part 1, 2 and 3
Viscosity range: min. 10 mm²/s to max. 420 mm²/s
Filtration: Permitted operating uid contamination
level according to ISO 4406 Class
21/19/16 or better
MTTF
d
: 150 - 1200 years,
according to DIN EN ISO 13849-1
Installation: No orientation restrictions
Materials: Valve body: steel
Piston: Hardened and
ground steel
Seals: NBR (standard)
FKM (optional,
temperature range
-20°C to +120°C)
Back-up rings: PTFE
Cavity: 12121 metric
Weight: 0.4 kg
* see “Conditions and Instructions for Valves” in brochure 53.000
EN 5.191.1.0/06.20
2
MODEL CODE
DWM12121ZD – 31 – C –N – 14 – 230 V 200
Basic model
Circuit pressure compensator,
normally closed
Type
21 = without damping,
without relief bore
22 = with damping,
without relief bore
24 = with damping on one side,
without relief bore,
quick closing
31 = without damping,
with relief bore
33 = with heavy damping,
with relief bore
34 = with damping on one side,
with relief bore,
quick closing
Body and ports
C = Cartridge valve
Sealing material
N = NBR (standard)
V = FKM
Control pressure dierence
03 = 3 bar
05 = 5 bar
06 = 6 bar
08 = 8 bar
10 = 10 bar
13 = 13 bar
14 = 14 bar
(others on request)
Pressure range (PR)
060 = 60 bar
125 = 125 bar
230 = 230 bar
350 = 350 bar
(others on request)
Type of adjustment
V = adjustable using tool
Pressure setting
200 = pre-set cracking pressure 200 bar
(others on request)
Standard models
Model code Part no.
DWM12121ZD-21-C-V-14-230V200 3302080
DWM12121ZD-22-C-N-08-350V350 4137846
DWM12121ZD-23-C-V-14-230V180 3576028
DWM12121ZD-33-C-V-06-230V180 3530987
Standard in-line bodies
Code Part no. Material Ports
R12121-01X-01 3130704 Steel, zinc-plated G3/4", G3/8"
Seal kits
Code Material Part no.
FS METRISCH 12121/N NBR 3651335
FS METRISCH 12121/V FKM 4080086
TYPICAL PERFORMANCE
measured at ν = 33 mm²/s, T
oil
= 46°C
0
20
40
60
80
1
00
120
0 1 2 3 4 5 6 7 8 9 10
Q [l/min] 1 to 2
Needle valve orice diameter d [mm]
DWM12121ZD-...-C-N-03-...
0
20
40
60
80
1
00
120
0 1 2 3 4 5 6 7 8
DWM12121ZD-...-C-N-14-...
Needle valve orice diameter d [mm]
Q [l/min] 1 to 2
0
25
50
75
1
00
1
25
1
50
1
75
2
00
2
25
250
0 20 40 60 80 100 120
DWM12121ZD-11-C-N-230V200
Flow rate [l/min]
Relieving pressure [bar]
EN 5.191.1.0/06.20
3
DIMENSIONS
millimetre
subject to technical modications
millimetre
subject to technical modications
CAVITY
12121 metric
32 HEX
Torque*
4 HEX
13 HEX
6 Nm
Form tools
Designation Part no.
Spiral countersink 177317
Reamer 175021
KK countersink 162128
tting depth
tting depth
HYDAC Fluidtechnik GmbH
Justus-von-Liebig-Str.
D-66280 Sulzbach/Saar
Tel.: +49 (0) 68 97 /509-01
Fax: +49 (0) 68 97 /509-598
E-mail: valves@hydac.com
NOTE
The information in this brochure relates to
the operating conditions and applications
described. For applications not described,
please contact the relevant technical
department.
Subject to technical modications.
VE = Visual Examination
* Allowed drilling zone (for manifold design)
** Sharp edges should be avoided by rounding
to a radius of 0.1 mm to 0.2 mm
*** largest pre-drilling diameter
(nominal tool diameter)
*Torque:
Steel manifold
(ultimate tensile strength < 360 N/mm²):
110 Nm
Aluminium manifold
(ultimate tensile strength < 330 N/mm²):
70 Nm
(tool acc. to DIN EN ISO 6789,
tool type II class A or B)
For further informations see brochure
No. 53.000
"Conditions and instructions for valves"
EN 5.191.1.0/06.20
4