Diesel Engine Controls

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

EHPR98-T38 Valve symbol


A direct-acting, spool-type, drop-in-style, flange-mounted, pressure reducing/relieving
valve for diesel engine applications. It 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.
The EHPR98-T38 can be specified as an electro-proportional reducing/relieving valve for variable
flow pump, engine brake, turbocharger and fuel and oil control applications.

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.

• Compatible with diesel fuel types 1 and 2.
• 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.

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: Compatible with ISO Classification 19 (25 µm), NAS classification
Fluids: For use with common diesel fluids
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

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




EHPR98-T38 Valve Performance Chart


EHPR98-T38 Valve Performance Chart


EHPR98-T38 Valve Performance Chart

EHPR98-T38 Valve Dimensions



Cartridge including Coil: Weight: 0.32 kg
(0.70 lb); 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



EHPR98-T38 Ordering Chart