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    Pressure Control Valves

    Pressure Control Valves

    CB Series Counterbalance Valve

    General Description:

    Counterbalance valve are used in hydraulic systems to control the speed of hydraulic motors and cylinders independent of the load (prevents running away). In addition there is an isolater function for pipe burst safety. Counterbalance valve comprises basically of the housing, main poppet, pilot part, pilot spool, damping spool and pilot damping.


    Pressure rating 315 bar

    Flow up to 560 LPM


    • Pilot operated check valve, leak-free function
    • The counterbalance valve controls the returning flow q v2 in relation to the flow being directed into the other side of the actuator q v1.
    • With cylinders the area ratio (q v2=q v1) has to be taken into account
    • By-pass valve, free flow in opposite direction
    • Optional built-on secondary pressure relief valve (only for flange mounted valve)

    CG2V-10, CG5V-10 Pressure Relief Valves

    General Description

    CG2V and CG5V pressure valves are pilot operated pressure relief valves. They are used for the limitation (CG2V) or limitation and solenoid actuated unloading (CG5V) of the control pressure. The pressure relief valves (CG2V) consist mainly of the main valve with main spool assembly and pilot operated valve with pressure adjustment element.

    Pressure relief valve type CG2V

    The pressure present in port P acts on the main spool. At the same time pressure is applied via the control lines and, which are fitted with orifices and, on the spring loaded side of the main spool and at the ball in the pilot control valve. If the pressure in port P exceeds the valve set at the spring, the ball opens against the spring.

    The signal for this comes internally via the control lines and from port P.  The pressure fluid on the spring loaded side of the main spool now flows via the control line, orifice bore and ball into the spring chamber. In type CG2V it flows internally via the control line to tank, or in type CG2V...Y externally via the control line. Due to the orifices and a pressure drop occurs at the main spool, the connection from port P to port T is open.

    Now the pressure fluid flows from port P to port T whilst maintaining the set operating pressure.

    The pressure relief valve may be unloaded or switched over to a different pressure (second pressure stage) via port X.

    Pressure relief valve type CG5V

    The function of this valve is basically same as the valve type CG2V.

    The unloading at the main spool, however, is acheived by the built-in directional valve.


    • Subplate mounting
    • Porting pattern to DIN 24 340, form E, ISO 6264, CETOP-RP 121H and NFPA/ANSI
    • Three adjustment elements:
      • Rotary knob
      • Hex. head screw with protective cap
      • Lockable rotary knob with scale
    • Solenoid operated unloading

    CGR Remote Control Pressure Relief Valve

    General Description

    This valve is suitable as a remote control device for Vickers balanced piston type relief valves, e.g. models ECG-06/10). It is not intended to be used as a relief valve by itself.

    The valve can provide adjustment of a system pressure from a convenient or remote location.

    Operating Data

    Maximum Pressure 70, 140 or 210 bar (1000, 2000 or 3000 psi) according to adjustment range.
    Maximum Flow Rate All models 4,1 L/min (15.5 USgpm)

    Control Data

    The pressure is adjusted by slackening the locknut and turning the adjusting device in a clockwise direction to increase pressure and counter clockwise to decrease pressure. Re-tighten locknut after setting the pressure.

    The outlet port should be piped directly to tank at atmospheric pressure. Any pressure at the drain port is additive to the pressure setting of the valve.

    All valves can be used with antiwear hydraulic oils, water-in-oil emulsions and water glycols.

    Add prefix “F3” to model designation when phosphate ester (except alkyl-based) or chlorinated hydrocarbons are to be used.


    Viscosities can range between 860 and 13 cSt (4000 and 70 SUS) but the recommended running range is from 54 to 13 cSt (245 to 70 SUS).

    Temperature Limits

    Ambient Min. –20 degrees C (–4 degrees F)

    Max. +70 degrees C (158 degrees F)

    DARV Pressure Relief Valve - Direct Acting

    General Description

    Eaton’s Vickers® DARV pressure relief valves are direct operated poppet valves.

    They are used to limit the pressure in a hydraulic system.

    The valves mainly consist of sleeve, spring, poppet with damping spool pressure 25 to 400 bar and adjustment element. The setting of the system pressure is variable via the adjustment element. The spring pushes the poppet onto the seat. The P line is connected to the system pressure. The system pressure is applied to the poppet area.

    If the pressure in P line exceeds the value set at the spring, the poppet opens against the spring. Now pressure fluid flows from P line into T line. The stroke of the poppet is limited by a pin.

    In order to maintain good pressure control over the entire pressure range it is split into seven pressure ranges.


    • For manifold mounting cartridge valve
    • For In-line threaded mounting
    • For manifold mounting
    • Three pressure adjustment elements, optional:
      • Wrench adjustable grub screw with protective cap
      • Rotary knob/hand lever
      • Lockable rotary knob

    X(C)G2V-10 Pressure Reducing Valves

    General Description

    XCG-2V-10 pressure valves are pilot operated pressure reducing valves, which are controlled from the secondary circuit.

    They basically consist of main valve with main spool insert and pilot valve with pressure adjustment element.

    At rest, the valves are open, fluid can freely pass from port B to port A via the main spool insert.

    Pressure present in port A acts upon the bottom side of the main spool. At the same time there is pressure acting on the ball in the pilot valve via the orifice on the spiring-loaded side of the main piston and via the port. Pressure from port A is also acting on the ball via the orifice, control line, check valve and orifice. According to setting of spring, pressure builds up in front of the ball, in port and in spring chamber, holding the control piston in the open position. Fluid can freely flow from port B to port A via main spool insert, until the pressure in port A exceeds the value set at spring and opens the ball. The control piston moves to closing position.

    The desired reduced pressure is acheived, when a balance between the pressure in port A and the pressure set at spring is reached.

    Pilot oil drain from spring chamber to tank takes place externally via control line.

    Free return flow from port A to B can be acheived by installing an optional check valve.

    A pressure guage connection allows the reduced pressure in port A to be monitored.


    • For subplate mounting  mounting pattern to DIN 24 340, form D,ISO 5781, CETOP-RP 121H
    • Three adjustment elements:
      • Rotary knob
      • Sleeve with hexagon and protective cap
      • Lockable rotary knob with scale
    • Five Pressure settings
    • Optional check valve
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