• Installation in manifolds (cartridge valve)
  • With SAE flange ports
  • Sub-plate connection or block,porting pattern to DIN 24340 form D,ISO 5781 and CETOP-RP 121 H
  • Check valve pilot operated (leakage-free)
  • The check-Q-meter controls the returning flow QV2 in relation to the flow QV1 in the inlet port of actuator. For the application in cylinders system,the area ratio (QV2 = QV1 Φ) has to be taken into account
  • Bypass valve, free flow in opposite direction
  • Safety valve, optional (Only for valve with flange port and special plate valve type FD12 and FD16)

Characteristic curves (Measured at t=40℃±5℃, using HLP46)

Fluid Mineral oil
Phosphate ester
Fluid temperature range -20 to +80
Viscosity range mm2/s 10 to 800
Degree of contamination Maximum permissible degree of fluid contamination: Class 9. NAS 1638 or 20/18/15, ISO4406
Operating pressure, ports A, X bar to 350
Operating pressure, port B bar to 420
Pilot pressure, port X (flow control range) bar min.20~60, max.350
Cracking pressure, A to B bar 2
Setting pressure for secondary pressure relief valve bar to 400
Flow -rate L/min 80(size 12),200(size 16),320(size 25),560(size 32)
Area ratio of the pre-opening poppet seat area 1
area of pilot spool 20

FD...L2X Check Q Meter Valve

Check-Q-meters are used to prevent runaway of hydraulic cylinder and motor in hydraulic system. They can also prevent pipe bursting.