CB Series Counterbalance Valve
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
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
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.
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)
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).
Ambient Min. –20 degrees C (–4 degrees F)
Max. +70 degrees C (158 degrees F)
DARV Pressure Relief Valve - Direct Acting
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