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Note: Data may vary by configuration. See CONFIGURATION section.

Cavity 20MS-3
Rated Flow 7.93 gpm 30 L/min
Maximum Recommended Load Pressure at Maximum Setting 3800 psi 270 bar
Maximum Setting 5000 psi 350 bar
Factory Pressure Settings Established at 109.84 cu in/min 1.8 LPM
Reseat 85% of setting
Valve Hex Size 1 in. 25.4 mm
Valve Installation Torque 30 - 37 lbf-ft 40 - 50 Nm
Adjustment Screw Internal Hex Size 5/32 in. 4 mm
Locknut Hex Size 9/16 in. 14 mm
Locknut Torque 4 - 5 lbf-ft 6 - 7 Nm
Weight 0.44 lbs 0.2 kg
Counterbalance valves (overcenter valve) with pilot assist provides static and dynamic control of loads to prevent overruning of hydraulic actuators such as cylinders or motors. The check section allows free flow from port 2 to port 1 then holds and locks the load against movement. Pilot pressure at port 3 reduces the pressure setting by pilot ratio of counterbalance valve but the pressure required to open the valve and start actuator movement can be calculated as follows: Pilot Pressure = [(Relief setting)- (Load Pressure)]/ Pilot Ratio. Varying the pilot ratios can optimize the hydraulic system by providing stable load control and improving energy efficiency.

  • This is a pilot-assisted, poppet type valve.
  • Reduce valve setting and release load by turning screw counterclockwise.
  • This valve is a non-restrictive balance valve with a rugged design, suitable for higher sudden impacts at load ports.
  • The pilot ratio affects the stability of the mechanical movement, the pilot ratio is low, and the pressure rises steadily.
  • The pressure setting will increase when back pressure at port 2. PS=(PR+1)xBP; PS=Pressure Setting, PR=Pilot Ratio, BP=Back Pressure
  • Pressure setting should be at least 1.3 times the maximum load induced pressure. (We suggests when the maximum setting pressure is 350 bar, the load pressure has to be lower than 270 bar.)
  • Winner offers a variety of seal kit materials for different applications, see seals information under Technical Reference.
  • In considering the leakage test of the master-slave circuit and the integral cylinder and valve, there is no positive sealing between port 2 and port 3.
  • Counterbalance valve is ideal for mounting directly near or in cylinder, hydraulic motor and rotary actuator as protection to increase the safety of the circuit.
  • Air is purged from the pilot line through a slight leakage from port 2 to port 3 of the pilot piston. Sealed pilot option available for cross-port leakage-free circuits.
  • When a valve is set at standard pressure, it is important to note that the reseat percentage should not exceed 85% of the set pressure or it will lower the reaseat performance.
  • Internal components are made of high-quality alloy steel, processed heat treatment and precision machined to achieve excellent wear resistance, low leakage, smooth movement and long service life.
  • Single overcenter valves are suitable for applications such as aerial platforms and cranes where the load only moves in one direction. Dual overcenter valves are ideal for motor applications or for controlling cylinders that move in both directions, providing precise control over the load.
  • External components are WINNERcoat® Zinc-Nickel Plating for 1000 hours salt spray test according to DIN EN ISO 9227. Also, some ordering code with letter "P" at the end is stainless steel external components. The ordering code with letter "S" at the end is all components of cartridge valve are made of stainless steel for special requirements such as deep sea, marine or water based hydraulic.
  • Winner guarantees that all products performance a 100% functional test before shipment.
                                   
Explanation：

CB series counterbalance valves - restrictive、semi- restrictive and ultra- restrictive type are mainly to solve the vibration (hunting) caused by the cylinder when lowering. Especially for the oil return application to when the axis of cylinder is downward、the Area ratio is big and lifting needs big flow、lowering becomes as small flow.

According to experience, the choice of the flow from Port 1 to Port 2 for counterbalance valves is as below for reference.

1.) CB11A3CHL：is applicable to when the flow is 30 ~ 60LPM.
2.) CB11A3CHL40：is applicable to when the flow is 15 ~ 40LPM.
3.) CB11A3CHL20：is applicable to when the flow is 5 ~ 20LPM.
4.) CB11A3CHL10：is applicable to when the flow is under 10LPM.