Diesel Engine Controls

EHPR98-T38 — Proportional, Reducing / Relieving, Drop-in
  More Diesel Control Products.
  PDF file of this page.
  STP file for EHPR98-T38.
  Get Custom Powertrain Control Engineering Assistance

EHPR98-T38 Valve SYMBOL:

EHPR98-T38 Valve symbol

 

DESCRIPTION
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.

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
• 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.

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: 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

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 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

 

ORDERING CHART:

EHPR98-T38 Ordering Chart