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Counterbalance Valve D03 (NG6) module, 15 GPM 3000 psi, 3:1 ratio T-11A cavity
Counterbalance Valve D03 (NG6) module, 15 GPM 3000 psi, 3:1 ratio T-11A cavity
Counterbalance Valve D03 (NG6) module, 15 GPM 3000 psi, 3:1 ratio T-11A cavity
Counterbalance Valve D03 (NG6) module, 15 GPM 3000 psi, 3:1 ratio T-11A cavity
Counterbalance Valve D03 (NG6) module, 15 GPM 3000 psi, 3:1 ratio T-11A cavity
Counterbalance Valve D03 (NG6) module, 15 GPM 3000 psi, 3:1 ratio T-11A cavity
Counterbalance Valve D03 (NG6) module, 15 GPM 3000 psi, 3:1 ratio T-11A cavity
Counterbalance Valve D03 (NG6) module, 15 GPM 3000 psi, 3:1 ratio T-11A cavity
Counterbalance Valve D03 (NG6) module, 15 GPM 3000 psi, 3:1 ratio T-11A cavity
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Counterbalance Valve D03 (NG6) module, 15 GPM 3000 psi, 3:1 ratio T-11A cavity

VMCB6-A-H-30-1
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Counterbalance valves hold an actuator from moving without the need of an active supply pressure.  Typically used to hold a load for safety if a line is broken or power is lost.  The counterbalance pressure setting should be 1.3 times the pressure to hold the load.

This counterbalance valve is a module and can be mounted under other D03 (NG6) size valves.

Backpressure at port 2 adds to the effective relief setting at a ration of 1 plus the pilot ration times the backpressure.  

  • Operating pressure = 1015 to 3045 psi (70 to 210bar)
  • Maximum Pressure = 4060 psi (280bar)
  • Flow Rate = 15.9 GPM (60LPM) at 300 psi pressure drop.  Reference Flow vs. Pressure graph below.
  • Pilot Ratio = 3:1
  • Check Valve Spring Opening:  4.35psi (0.3 bar)
  • Seals = Viton
  • Temperature range = -22 to 230 deg. F(-30 to 110 deg. C)
  • Cavity = T-11A
  • Cartridge installation torque = 354 to 400 in-lbs. (40-45Nm)
  • Leakage = 5 drops/min. at 3000 psi (210 bar)
  • Oil filtration = 25 micron or better
  • Ports 1, 2 and 3 = SAE -8 O-ring Boss,  3/4-16 thread, Nominally 1/2"