Electro-Proportional Valves — Pressure Control

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

SYMBOL:
EHPR98-G35 Valve symbol

 

DESCRIPTION
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.

OPERATION
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.

FEATURES
• 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.

RATINGS
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

RECOMMENDED ELECTRONIC CONTROLLERS
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.



 

 

PERFORMANCE:

EHPR98-G38 Valve Relieving/Reducing Chart
EHPR98-G38 Typical Step Response

 



EHPR98-G38 Pressure vs. Flow Chart

 

DIMENSIONS:
EHPR98-G38 Valve Dimensions

 


MATERIALS:

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).

 

ORDERING CHART:

EHPR98-G38 Ordering Chart