Electro-Proportional Valves — Pressure Control

EHPR98-G38 — Proportional, Reducing / Relieving, Drop-in
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EHPR98-G35 Valve

EHPR98-G35 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.

The EHPR98-G38 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.
• Several regulated pressure ranges.
• Retrofit option for EHPR98-T38.
• Quick response time.
• Screen option.
• Top-mounted connector.
• Low leakage.

Pressure Rating: 34.5 bar (500 psi) at all ports
Proof Pressure: Ports 1 and 2: 207 bar (3000 psi) Port 3: 54 bar (780 psi)
Burst Pressure: 45 bar (652 psi) all ports pressurized
Flow Rating:23 lpm (6 gpm)
Maximum Internal Leakage: De-energized: 50 ml/min (3.1 cu. in./min) @ 34.5 bar (500 psi);
   Energized @ Imax: To be determined
Cycle Life: 10 million cycles
Operating Fluid Temperature: -40 to 149°C (-40 to 300°F), with standard HNBR seals;
   -26 to 204°C (-15 to 400°F), with fluorocarbon seals.
Maximum Control Current: 1.0 amps for 10 VDC coil; 0.88 amps for 12 VDC coil;
   0.72 amps for 14 VDC coil; 0.52 amps for 20 VDC coil ; 0.44 amps for 24 VDC coil;
   0.36 amps for 28 VDC coil.
Control Pressure at Maximum Control Current: 21 bar (305 psi) for EHPR98-G38A;
   25 bar (363 psi) for EHPR98-G38B; 30 bar (435 psi) for EHPR98-G38C
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: 77 mH (10V), 118 mH (12V), 165 mH (14V), 301 mH (20V), 446 mH (24V),
   680 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-G028 (Standard Configuration); VC-T011 (Retrofit Application); See page 9.111.1
Cavity Tool: CT-G028 (Standard Configuration) CT-T011 (Retrofit Application); See page 8.600.1
Seal Kit: SK-G028-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-G38 Valve Relieving/Reducing Chart
EHPR98-G38 Typical Step Response


EHPR98-G38 Pressure vs. Flow Chart


EHPR98-G38 Valve Dimensions



Cartridge Including Coil: Weight: 0.27 kg.
(0.60 lbs.) Steel with hardened work surfaces. Zinc-nickel plated exposed surfaces. HNBR seals standard. Coil is encapsulated, Class M high- temperature magnet wire, with zinc-nickel plated shell.

Ported Test Body: Part No. 7161210

Mounting Screws: Must be ordered separately;
M5 x 0.8 x 12 mm Long, Part No. 4002609
(with standard VC-G028 cavity); M4 x 0.7 x 12
Long; Part No. 4001015 (with retrofit application
VC-T011 cavity).



EHPR98-G38 Ordering Chart