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
(inow 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 dierences
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 dierential 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