Valves - Electro-proportional Controls - Pressure Controls - Proportional Pressure Reducing/Relieving - Direct Acting - Pressure Rising with Current - Drop-in

EHPR98-T33

PROPORTIONAL PRESSURE REDUCING / RELIEVING CARTRIDGE VALVE

Overview

Description

This is a direct-acting, spool-type, proportional, pressure reducing/relieving valve. It is a drop-in, flange mounted cartridge type valve for use with mineral based or synthetic (with lubricating properties) hydraulic fluids. The coil is an integral part of the valve and is not serviceable. The regulated pressure is proportional to the input electrical current in the pressure ranges shown

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

Manual Override Operation

Rotate manual override screw clockwise until desired regulated pressure is achieved

Features

  • 10, 12, 20 or 24 VDC coils.
  • Economical drop-in style.
  • Integral waterproof coil standard.
  • Corrosion-resistant plating.
  • Manual override and screen options.
  • Several push-on termination options.
Pressure Ratings
Maximum supply pressure:
  • 241 bar (3500 psi)
Maximum tank port pressure:
  • 34.5 bar (500 psi)
  • 17.2 bar (250 psi) For manual override option
Control pressure at maximum control current:
  • 30 bar (435 psi)
Flow Ratings
Hysteresis per cent:
  • 4 %
Flow rating:
  • 3.8 lpm (1.0 gpm)
Maximum internal leakage:
  • 200 ml/min (12 in³) Viscosity de-energized, at 32 cSt (150 SUS) 241 bar (3500 psi)
  • 400 ml/min (24 in³) Viscosity energized at imax, at 32 cSt (150 SUS) 241 bar (3500 psi)
Temperature Ratings
Ambient temperature:
  • -40 to 80 °C (-40 to 176 °F)
Operating fluid 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
Other Ratings
Environmental rating:
  • Ip96k
Unit weight:
  • 0.295 kg (0.650 lb) Standard
  • 0.302 kg (0.665 lb) Manual override
Internal wetted surface area:
  • 137 cm² (21.2 in²) Standard
  • 180 cm² (28 in²) Manual override
Maximum control current:
  • 1.38 A 10 V
  • 1.30 A 12 V
  • 0.69 A 20 V
  • 0.65 A 24 V
Note:
  • For other voltages, consult HydraForce
Dither PWM frequency:
  • 100 Hz
Valve inductance:
  • 80 mH 12 V coil
EHPR98-T33_Perf_Chrt1 EHPR98-T33_Perf_Chrt2 EHPR98-T33_Perf_Chrt3
EHPR98-T33_Dim_Dwg

Materials

Cartridge including Coil: Steel with hardened work surfaces. Zinc-plated exposed surfaces; HNBR O-rings standard. Coil is encapsulated, class H high temperature magnet wire, with zinc-nickel plated shell.

Ported Test Body: Consult Factory.

Mounting Screws: Must be ordered separately; Part no. 4001015

Cavity:
Mounting screw torque:
  • 1.2 to 1.5 N-m (0.9 to 1.1 ft-lb)
Mounting orientation:
  • Unrestricted
Mounting screw:
  • M4 x 0,7 x 12mm long, hf p/n 4001015 (sold separately)
Valve body:
  • Hf p/n: 71536x0 (sold separately)
Seal kit:
  • SKEHPR98-T3N HNBR
  • SKEHPR98-T3V Fluorocarbon
  • SKEHPR98-T3P Polyurethane
EHPR98-T33_Order
POSITION
CODE
DESCRIPTION
EHPR98-T33EG-H-J-KL
E
Manual Override
E
BLANK
NONE
E
M
Minimum Regulated Pressure Override, 3/16" Internal Hex
G
Screen
G
BLANK
NONE
G
S
100 Mesh Screen
H
Line Body
H
0
No Body
J
Seal
J
N
Buna-N
J
V
Fluorocarbon
K
Coil Voltage
K
10
10 VDC
K
12
12 VDC
K
20
20 VDC
K
24
24 VDC
L
Coil Termination
L
EJ
E-Coil, AMP Jr.
L
ER
E-Coil, Deutsch