Diesel Engine Controls

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

SYMBOL:
EHPR98-T33 Valve symbol

DESCRIPTION
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.

OPERATION
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.

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.
• Manual override and screen options.
• Stainless steel options available - consult factory.

RATINGS
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

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-T33 Valve Performance Chart

EHPR98-T33 Valve Performance Chart

EHPR98-T33 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-T33 Ordering Chart

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