Electro-Proportional Valves — Pressure Control

EHPR98-T38 — Proportional, Reducing / Relieving, Drop-in
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EHPR98-T38 Valve

SYMBOL:
EHPR98-T38 Valve symbol

 

DESCRIPTION
A drop-in, flange mount, direct-acting, hydraulic pressure reducing/relieving valve, which can be
infinitely adjusted across a prescribed range using a variable electric input. Pressure output is
proportional to DC current input. The E-coil is an integral part of the valve assembly, and cannot
be replaced or field-serviced.

OPERATION
The EHPR98-T38 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.
Note: Back pressure on port 3 becomes additive to the pressure setting at a 1:1 ratio.

FEATURES
• 10, 12, 20 or 24 VDC coils.
• 1000-hour salt spray protection.
• Economical drop-in style.
• Several push-on termination options.
• Integral waterproof coil standard.
• Optional 142 micron screen at port 2.

RATINGS
Max. Inlet Pressure: 241 bar (3500 psi)
Max. Tank Port 3 Pressure: 34.5 bar (500 psi); with Manual Override Option:
   17.2 bar (250 psi)
Control Pressure at Max. Control Current: 30 bar (435 psi)
Max. Control Current:1.38 amps for 10 VDC coil; 1.30 amps for 12 VDC coil;
   0.69 amps for 20 VDC coil; 0.65 amps for 24 VDC coil
Resistance: 4.3 ohm (10V), 5.2 ohm (12V), 17.5 ohm (20V), 20.9 ohm (24V)
Inductance: 80 mH (12V)
Hysteresis: at 100 Hz PWM: 5% of max. control pressure
Rated Flow: 18.9 lpm (5.0 gpm)
Max. Internal Leakage: De-engergized: 50 ml/min. (3 cu. in./min.) at 34.5 bar (500 psi);
   Energized at I-max: 100 ml/min. (6 cu. in./min.) at 34.5 bar (500 psi)
Temperature: -40° to 149°C (-40° to 300°F) with HNBR seals;
   -26° to 204°C (-15° to 400°F) with fluorocarbon seals
Ambient Air Temperature: -40° to 80°C (-40° to 176°F)
Environmental Rating: IP69K
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 Mount
Mounting Screws: M4 x 0.7 x 12 Long; Part No. 4001015 (not provided with valve)
Cavity: VC-T011; See page 9.111.1
Cavity Tool: CT-T011R0-x-G; See page 8.600.1
Seal Kit: SKT011; 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. For other Electronic Controllers, see page 2.001.1_pdf



 

 

PERFORMANCE:

EHPR98-T38 Valve Performance Chart

 


EHPR98-T38 Valve Performance Chart

 


EHPR98-T38 Valve Performance Chart
DIMENSIONS:

EHPR98-T38 Valve Dimensions

 


MATERIALS:

Cartridge including Coil:
Weight: 0.32 kg. (0.70 lbs.); Steel with hardened work surfaces. Zinc-plated exposed surfaces; HNBR O-rings standard. Coil is encapsulated, class H high temperature magnetwire, with
zinc-nickel plated shell.

Ported Test Body: Consult Factory.

Mounting Screws: Must be ordered separately; Part no. 4001015

 

ORDERING CHART:

EHPR98-T38 Ordering Chart