Diesel Engine Controls

EHPR98-T35 — Proportional, Reducing / Relieving, Drop-in
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EHPR98-T35 Valve

SYMBOL:
EHPR98-T35 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 Ecoil is an integral part of the valve assembly, and cannot be replaced or field-serviced.
EHPR98-T35 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-T35 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 ➂ 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.
• Manual override and screen options.
• Stainless steel options available - consult factory.

RATINGS
Max. Inlet Pressure: 103 bar (1500 psi); If higher inlet pressure is required
   (103 bar/1500 psi to 241 bar/3500 psi) select the “A” option in the model code.
Max. Tank Pressure: 34.5 bar (500 psi); with Manual Override Option: 17.2 bar (250 psi)
Control Pressure at Max. Control Current: 20.7 bar (300 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: 4.2 ohm (10V), 5.1 ohm (12V), 17.0 ohm (20V), 19.3 ohm (24V)
Inductance: 80 mH (12V)
Hysteresis: less than 4% with 100 Hz PWM
Rated Flow: 5.7 lpm (1.5 gpm)
Max. Internal Leakage:
   De-energized: 75 ml/minute (4.58 cu. in./minute) at 25 bar (365 psi);
   200 ml/minute (12.2 cu. in minute) at 241 bar (3500 psi)
   Energized at I-Max.: 125 ml/minute (7.63 cu. in./minute) at 25 bar (365 psi);
   400 ml/minute (24.4 cu. in. minute) at 241 bar (3500 psi)
Temperature: -40° to 120°C (-40° to 250°F) with standard Buna N 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-T009; See page 9.111.1
Cavity Tool: CT-T009R0-x-G; See page 8.600.1
Seal Kit: SKEHPR98-T3x; 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-T35 Valve Performance Chart

EHPR98-T35 Valve Performance Chart

EHPR98-T35 Valve Performance Chart  

DIMENSIONS:

EHPR98-T33 Valve Dimensions


MATERIALS:

Cartridge including Coil:
Weight: 0.20 kg. (0.44 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-T35 Ordering Chart


More Diesel Control Products.
PDF file of this page. STP file for EHPR98-T35. Get Custom Powertrain Control Engineering Assistance