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

EHPR98-G38

PROPORTIONAL PRESSURE REDUCING / RELIEVING CARTRIDGE VALVE

Overview

Description

The ehpr98-g38xx is a direct-acting, spool-type, proportional, pressure reducing relieving valve. It is a 3rd generation HydraForce 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-G33 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

Features

  • Economical drop-in style.
  • Mounting plate option.
  • Several regulated pressure ranges.
  • Retrofit option for EHPR98-T38.
  • Quick response time.
  • Screen option.
  • Top-mounted connector.
  • Low leakage.

Ratings

Pressure Ratings
Pressure rating:
  • 34.5 bar (500 psi) At all ports
Proof pressure:
  • 207 bar (3000 psi) Port 1
  • 207 bar (3000 psi) Port 2
  • 54 bar (780 psi) Port 3
Burst pressure:
  • 249 bar (3625 psi) All ports pressurized
Control pressure at maximum control current:
  • 21 bar (305 psi) EHPR98-G38A
  • 25 bar (363 psi) EHPR98-G38B
  • 30 bar (435 psi) EHPR98-G38C
Flow Ratings
Flow rating:
  • 23 lpm (6 gpm)
Maximum internal leakage:
  • 50 ml/min (3.1 in³/min) At 34.5 bar (500 psi) de-energized
Other Ratings
Cycle life:
  • 10 million cycles
Environmental rating:
  • Ip69k
Corrosion protection:
  • 960 hour salt spray per ASTM b117
Temperature Ratings
Operating fluid temperature:
  • -40 to 149 °C (-40 to 300 °F) HNBR
  • -26 to 204 °C (-15 to 400 °F) Fluorocarbon
Storage temperature:
  • -40 to 70 °C (-40 to 158 °F)
Ambient temperature:
  • -40 to 120 °C (-40 to 248 °F)

Operating Parameters

Fluids:
  • Mineral based or synthetic hydraulic fluid with lubricating properties
Fluid viscosity range:
  • 7.4 to 420 cSt

Properties

Unit weight:
  • 0.27 kg (0.60 lb)
Internal wetted surface area:
  • 148 cm² (23.0 in²)

Electrical Parameters

Maximum control current:
  • 1.050 A At 10 V
  • 0.0880 A At 12 V
  • 0.720 A At 14 V
  • 0.525 A At 20 V
  • 0.440 A At 24 V
  • 0.360 A At 28 V
Valve inductance:
  • 77 mH 10 V coil
  • 118 mH 12 V coil
  • 165 mH 14 V coil
  • 301 mH 20 V coil
  • 446 mH 24 V coil
  • 680 mH 28 V coil

Performance

EHPR98-G38_Perf_Chrt2 EHPR98-G38_Perf_Chrt3 EHPR98-G38_Perf_Chrt1

Dimensions

EHPR98-G38_Dim_Dwg

Materials

Materials

Cartridge Including Coil: Weight: 0.27 kg. (0.60 lbs.) Steel with hardened work surfaces. Zinc-nickel plated exposed surfaces. HNBR seals standard. Coil is encapsulated, Class M high-temperature magnet wire, with zinc-nickel plated shell.

Ported Test Body: Part No. 7161210

Mounting Screws: Must be ordered separately; M5 x 0.8 x 12 mm Long, Part No. 4002609 (with standard VC-G028 cavity); M4 x 0.7 x 12 Long; Part No. 4001015 (with retrofit application VC-T011 cavity).

Installation Specifications

Cavity:
Installation type:
  • Flange mounted
Orientation restriction:
  • None
Mounting screw torque:
  • 3 to 4 N-m (2.2 to 3 ft-lb)
Note:
  • For retro-fitting into older drop-in cavities and other mounting options, see "g3_mounting_options" technical reference

Accessories

Mounting plate:
  • Hf p/n 4595096
Mounting screw:
  • M5 - 0,8 x 12mm long, hf p/n: 4002609 (sold separately)
Valve body:
  • Hf p/n 71612x0 (sold separately) for retro-fitting into older drop-in cavities and other mounting options, see "g3_mounting_options" outline drawing.
Seal kit:
  • SK-G028-X X = seal option

Order Code

POSITION
CODE
DESCRIPTION
EHPR98-G38DG-H-J-KL-U
D
Max Regulated Pressure
D
A
21 bar (305 psi)
D
B
25 bar (363 psi)
D
C
30 bar (435 psi)
G
Screen
G
BLANK
NONE
G
S
100 Mesh Screen
H
Line Body
H
0
No Body
J
Seal
J
G
HBNR (Hydrogenated Nitrile Butadiene Rubber)
J
V
Fluorocarbon
J
P
Polyurethane
K
Coil Voltage
K
10
10 VDC
K
12
12 VDC
K
14
14 VDC
K
20
20 VDC
K
24
24 VDC
K
28
28 VDC
L
Coil Termination
L
EJ
E-Coil, AMP Jr.
L
EJ/Z
E-Coil, AMP Jr. with Zener Diode
L
ER
E-Coil, Deutsch
L
ER/Z
E-Coil, Deutsch with Zener Diode
L
EY2A
E-Coil, Metri-Pack 150.2
L
EY2A/Z
E-Coil, Metri-Pack 150.2 with Zener Diode
U
Mounting Plate
U
BLANK
None
U
G
Standard Single Valve Plate
U
T
Retro-Fit Plate
EHPR98-G38_Order