Electro-Proportional Valves — Pressure Control

EHPR98-G33 — Proportional, Reducing / Relieving, Drop-in
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EHPR98-G33 Valve

EHPR98-G33 Valve symbol


A direct-acting, spool-type, proportional, pressure reducing/relieving valve. It is a third generation
HydraForce drop-in, flange-mounted cartridge-type valve for use with mineral-based or synthetic
(with lubricating properties) hydraulic fluids. The coil is an integral part of the valve and cannot be
replaced or field-serviced. The regulated pressure is proportional to the input electrical current in
the pressure ranges shown. There is an option for a higher inlet pressure; some performance
characteristics will vary.

The EHPR98-G33 allows free flow from 1 to 3 when no current is applied to the coil. When the coil is
energized, 2 is connected to 1. Increasing current applied to the coil will increase the control (reduced)
pressure proportionally. If pressure at 1 exceeds the setting induced by the coil, pressure from 1 is
relieved to 3.

• Economical drop-in style.
• Mounting plate option.
• Compact size.
• Retrofit option for EHPR98-T33.
• Quick response time.
• Inlet screen and pressure options.
• Top-mounted connector.
• Low leakage.

Pressure Rating: 45 bar (650 psi) at all ports; with Option A 103-241 bar (1500-3500 psi) at
   port 2 and 45 bar (650 psi) at port 3.
Proof Pressure: 54 bar (780 psi) at port 3; 345 bar (5000 psi) at ports 1 and 2
Burst Pressure: 258 bar (3750 psi) all ports pressurized
Flow Rating: 3.8 lpm (1.0 gpm)
Maximum Internal Leakage: De-energized: 60 ml/min (3.6 cu. in./min) @ 34.5 bar (500 psi);
   Energized @ Imax: 60 ml/min (3.6 cu. in./min) @ 34.5 bar (500 psi).
   With Option A: De-energized: 200 ml/min (12.2 cu.in./min) @ 241 bar (3500 psi)
   Energized @ Imax: 200 ml/min (12.2 cu.in./min) @ 241 bar (3500 psi)
Cycle Life: 10 million cycles
Operating Fluid Temperature: -40 to 149°C (-40 to 300°F), with HNBR seals;
   -26 to 204°C (-15 to 400°F), with fluorocarbon seals;
   -54 to 107°C (-65 to 225°F), with polyurethane seals.
Maximum Control Current: 1.1 amps for 10 VDC coil; 0.94 amps for 12 VDC coil;
   0.78 amps for 14 VDC coil; 0.56 amps for 20 VDC coil ; 0.47 amps for 24 VDC coil;
   0.39 amps for 28 VDC coil.
Control Pressure at Maximum Control Current: 30 bar (435 psi)
Hysteresis: 4% with 120 Hz PWM
Resistance: 4.8 ohms (10V), 7.2 ohms (12V), 10.0 ohms (14V), 18.3 ohms (20V);
   29.5 ohms (24V), 40.3 ohms (28V)
Inductance: 68 mH (10V), 104 mH (12V), 152 mH (14V), 284 mH (20V),
   433 mH (24V), 645 mH (28V)
Environmental Rating: IP69K; 1000-hour salt spray per ASTM B117
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: Flange Mounted. See page 8.525.1
Mounting Screws: M4 x 0.7 x 12 Long; Part No. 4001015 (not provided with valve)
Cavity: VC-G027 (Standard Configuration); VC-T009 (Retrofit Application); See page 9.111.1
Cavity Tool: CT-G027 (Standard Configuration) CT-T009 (Retrofit Application); See page 8.600.1
Seal Kit: SK-G027-X; See page 8.650.1

The EVDR Series controllers are recommended for use with most HydraForce proportional valves.
These newer electronic controllers are versatile, reliable, and easily configured and customized for
a wide range of applications. See the EVDR Product Selection Guide.




EHPR98-G33 Valve Pressure vs Flow
EHPR98-G33 Valve Step Response


EHPR98-G33 Valve Frequency Response Curves


EHPR98-G33 Valve Relieveing/Reducing

EHPR98-G33 Valve Dimensions




Cartridge Including Coil: Weight: 0.26 kg.
(0.57 lbs.) Steel with hardened work surfaces. Zinc-nickel plated exposed surfaces.
HNBR seals standard. Coil is encapsulated,
Class N high- temperature magnet wire,
with zinc-nickel plated shell.

Ported Test Body: Part No. 71611X0

Mounting Screws: Must be ordered
separately; M5 x 0.8 x 12 mm
Long, Part No. 4002609 (with standard
VC-G027 cavity); M4 x 0.7 x 12
Long; Part No. 4001015 (with retrofit application VC-T009 cavity).



EHPR98-G33 Ordering Chart