Flow Control Valve
  Bypass Flow Control, Adjustable Orifice

QFR12-33  = Pressure compensated flow control valve =



A screw-in, cartridge-style, adjustable orifice, pressure-compensated, manually-operated, bypass-type hydraulic flow regulating valve. It can be used as a priority-type flow regulator or a restrictive-type 2-way flow regulator when the bypass port ② is blocked.
The QFR12-33 maintains a constant flow rate from ③ regardless of load pressure changes in the system downstream of ③, or in the bypass leg at ②. Reverse flow (③ to ①) bypasses the control orifice. The regulated flow increases from closed to fully open, with counter-clockwise rotation of the knob.
Note: When used as a bypass flow control in applications where the priority flow port will be blocked by external valving, bypass pressure drop will increase unless a small amount of leakage is provided for the priority port..


Pressure (bar)
Proof Pressure (bar) Flow Internal Leakage
User Temperature(0C) Operation Voltage
 240 350  68 lpm/18 gpm 0.15 cc/min
(First remove inside air)
 -400~ 120  ± 15% voltage

.100% full inspection for all products.
.Standard product life tested for million cycles.
.1000-hour salt-spray anti-corrosion protection tested.
.Raw material, oil, electroplating, etc. in manufacturing process with RoHS compliance.
.All coils tested by third party notarization inspection & CE certified.
.Heat Treatment on spool, poppet, cage for long life and low leakage.
.Coil rated for continuous duty
.Customized coil voltages and terminations
.Cartridges are customized.
.Manual override option.
.Multi industrial applications.
.Compact size.
.Coil mold design with sufficient demands


Operating Pressure: 240 bar (3500 psi)
Proof Pressure: 350 bar (5075 psi)
Flow: 68 lpm (18 gpm)
Internal Leakage: 0.15 cc/minute
User Temperature: -40° to 120°C (-40° to 248°F) with Buna seals;
User Temperature: -26° to 204°C (-15° to 400°F) with Fluorocarbon seals
Filtration: With S: 100 mesh (149 micron)
Operation Voltage: ±15% voltage
Cavity: Q12-3; See page Q12-3



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