Diesel Engine Controls

EHPR98-T33 — Proportional, Reducing / Relieving, Drop-in
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EHPR98-T33 Valve

EHPR98-T33 Valve symbol

A direct-acting, spool-type, drop-in-style, flange-mounted, 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 Ecoil is an integral part of
the valve assembly, and cannot be replaced or field-serviced. The EHPR98-T33 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-T33 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.
• Manual override and screen options.
• Stainless steel options available - consult factory.

Max. Inlet Pressure: 241 bar (3500 psi)
Common Port Burst Pressure: One cycle at 158 bar (2300 psi) on all ports
   simultaneously pressurized
Max. Tank Pressure at port 3: 34.5 bar (500 psi); 17.2 bar (250 psi) with manual override.
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
Control Pressure at Maximum Control Current: 30 bar (435 psi)
Resistance: 4.2 ohm (10V), 5.1 ohm (12V), 17.0 ohm (20V), 19.3 ohm (24V)
Inductance: 80 mH (12V)
Hysteresis: 4% with 100 Hz PWM
Rated Flow: 3.8 lpm (1.0 gpm)
Maximum Internal Leakage: De-energized: 200 ml/min (12 cu.in/min.) @241 bar
   (3500 psi); Energized @ Imax: 400 ml/min (24 cu.in./min.) @ 241 bar (3500 psi).
Step Response: TON <30 ms; TOFF <12 ms
Temperature: -40° to 149°C (-40° to 300°F) with HNBR seals
   -26° to 204°C (-15° to 400°F) with Fluorocarbon seals
   -54° to 107°C (-65° to 225°F) with Polyurethane 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

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-T33 Valve Performance Chart

EHPR98-T33 Valve Performance Chart

EHPR98-T33 Valve Performance Chart  


EHPR98-T33 Valve Dimensions


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

EHPR98-T33 Ordering Chart

More Diesel Control Products.
PDF file of this page. STP file for EHPR98-T33. Get Custom Powertrain Control Engineering Assistance