DESCRIPTION
A pressure-compensated electrically-variable three-port fl ow regulator that is a priority
(bypass) type control. This combination valve uses a PV72-33x proportional cartridge
and an EC12-40 compensator.
OPERATION
The PFR72-33x-J series will bypass all fl ow when de-energized at the pressure com-
pensator spring value. When energized, this proportional valve/compensator pack-
age will regulate fl ow out of port
➁, regardless of system working pressure, with an
increasing current applied to the solenoid.
FEATURES
• Excellent linearity and hysteresis.
• Optional control orifi ce sizes.
• Hardened spool and cage for long life.
• Optional coil voltages and terminations.
• Effi cient wet armature construction.
RATINGS
Operating Pressure: 207 bar (3000 psi)
Pressure Rise: Pressure at
➀ begins to rise higher than the compensating pressure
differential when bypass fl ow exceeds 41.6 lpm (11 gpm).
Internal Leakage: 492 cc/min. (30 cu. in./min.) fully closed at 207 bar (3000 psi) out
port ➁.
Electrical: 2 standard voltage ratings
2.407.1
USASI/ISO:
SYMBOLS
PERFORMANCE CURVES
24 Volt coil used; 100 Hz dither; PWM controller
75.7/20
41.4
600
ΔP LOAD bar/psi
FLOW lpm/gpm
Priority Port Flow Rate Loss Under Load
PV72-33A with EC12-40 Typical
11 bar/160 psi compensator —
6.9 bar/100 psi compensator - - -
82.8
1200
124.1
1800
165.5
2400
206.9
3000
68.1/18
60.6/16
45.4/12
30.2/8
15.1/4
53.0/14
37.9/10
22.7/6
7.5/2
PFR72-33x-J Proportional Priority Flow Regulator,
Max. Control
Current
1500 ± 200 mA
750 ± 100 mA
Coil Voltage
12 VDC
24 VDC
Operation of 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.
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 Port Flow Delivered Out Port ➁:
For 12 volt coils, double the current (amp) values shown.
75.8/20
CURRENT amp
FLOW lpm/gpm
Flow vs. Current (207 bar/3000 psi Load)
PV72-33A with EC12-40
11 bar/160 psi spring ——
6.9 bar/100 psi spring - - - -
100 Hz Dither
.1
68.1/18
45.4/12
37.9/10
22.7/6
7.5/2
15.1/4
30.2/8
53.0/14
60.6/16
.2 .3 .4 .5 .6 .7 .8 .9 1.0
75.8/20
CURRENT amp
FLOW lpm/gpm
Flow vs. Current (207 bar/3000 psi Load)
PV72-33B with EC12-40
11 bar/160 psi spring ——
6.9 bar/100 psi spring - - - -
100 Hz Dither
.1
68.1/18
45.4/12
37.9/10
22.7/6
7.5/2
15.1/4
30.2/8
53.0/14
60.6/16
.2 .3 .4 .5 .6 .7 .8 .9 1.0
Attention Manifold Designers:
To obtain these high fl ow capabilities
using proportional fl ow controls and
compensators, optimized cavity drillings
are required. Please consult factory.
ELECTRO-PROPORTIONAL VALVES—FLOW CONTROLS
HYDRAFORCE
.com
®
• Cartridges voltage interchangeable.
• Unitized, molded coil design.
• Coil waterproofi ng standard.
• Screw-in manual override option.
Threshold
Current
300 ± 70 mA
150 ± 35 mA
Blue rectangles are links to other catalog pages.