Electro-Proportional Valves — Flow Control

PFR72-33J — Flow Regulator, Normally Closed, Priority Bypass
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PFR72-33J Valve symbol

Attention Manifold Designers:
To obtain these high flow capabilities using proportional flow controls and compensators, optimized cavity drillings are required. Please consult factory.
A pressure-compensated electrically-variable three-port flow regulator that is a priority
bypass-type control. This combination valve uses a PV72-33x proportional cartridge and
an EC12-40 compensator.

The PFR72-33x-J will bypass all flow when de-energized at the pressure compensator
spring value. When energized, this proportional valve/compensator package will regulate
flow out of port 2, regardless of system working pressure, with an increasing current applied
to the solenoid.
Manual Override: To Engage: Turn clockwise approximately 1 turn to reach start point.
Continue another approximately 5 turns to full shift.
To Disengage: Turn counterclockwise approximately 6 turns until positive stop is found.

• Excellent linearity and hysteresis characteristics.
• Hardened spool and cage for long life.
• Optional control orifice sizes.
• Optional coil voltages and terminations.
• Efficient wet-armature construction.
• Cartridges are voltage-interchangeable.
• Unitized, molded coil design.
• Coil waterproofing standard.
• Screw-in manual override option.

Operating Pressure: 207 bar (3000 psi)
Pressure Rise: Pressure at 1 begins to rise higher than the compensating pressure
    differential when bypass flow exceeds 41.6 lpm (11 gpm)
Internal Leakage: 492 cc/min. (30 cu. in./min.) fully closed at 207 bar (3000 psi) out port 2
Electrical: 2 standard voltage ratings:
Coil Voltage Threshold Current Max. Control Current
12 VDC 300±70 mA 1500±200 mA
24 VDC 150±35 mA 750±100 mA
Filtration: See page 9.010.1
Fluids: Mineral-based or synthetics with lubricating properties at viscosities of
    7.4 to 420 cSt (50 to 2000 sus); See Temperature and Oil Viscosity, page 9.060.1
Installation: No restrictions; See page 9.020.1



Priority Flow Delivered out Port 2; 24 volt coil used (for 12 volt coils, double the amp values shown);100 Hz Dither; PWM Control

PFR72-33J Valve Flow Performance chart


PFR72-33J Valve Flow Performance chart



PFR72-33J Valve Dimensions



Cartridge: Steel with hardened work
surfaces. Zinc-plated exposed surfaces;
Buna N O-rings and back-ups standard.

Standard Ported Body: Anodized
high-strength 6061 T6 aluminum alloy,
rated to 207 bar (3000 psi); Ductile iron
bodies available; dimensions may differ.
Consult factory.

70-Size D-Coil:
See page 3.200.1_70-size.

70-Size E-Coil:
See page 3.400.1_70-size.

Package Weight: 2.95 kg (6.5 lb)

Seal Kit:
SK12-3x-MM (PV valve)
SK12-4x-TMB (EC valve)



PFR72-33J Ordering