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

EHPR08-33

PROPORTIONAL PRESSURE REDUCING / RELIEVING CARTRIDGE VALVE

Overview

Description

EHPR08-33X is a direct-acting, spool-type, proportional, pressure reducing/ relieving valve. The regulated pressure is proportional to the input electrical current. EHPR08-33X free flow from port 1 to port 3 when no current is applied to the coil. With coil energized, port 2 is connected to port 1. Increasing current to the coil will increase the control (reduced) pressure proportionally. If pressure at port 1 exceeds the setting induced by the coil, pressure from port 1 port 1 is relieved to port 3

Operation

The EHPR08-33 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

Engages at 2 1/4 turns, builds pressure at 11.7 bar 170 psi per turn

Features

  • 12 and 24 volt coils standard.
  • Optional manual override.
  • Industry-common cavity.
  • Optional waterproof E-Coils rated up to IP69K.
Pressure Ratings
Pressure rating:
  • 241.3 bar (3500 psi) At port 2 (inlet)
  • 103.4 bar (1500 psi) At port 1
  • 68.9 bar (1000 psi) At port 3. Maximum pressure difference between ports 1 or 3 and port 2 68.9 bar (1000 psi)
Proof pressure:
  • 379.2 bar (5500 psi)
Burst pressure:
  • 827.4 bar (12000 psi)
Pressure rise:
  • -1.24 bar/lpm (-68 psi/gpm) (reducing)
Maximum reducing pressure:
  • 26 bar (375 psi) Pressure is additive to valve setting
Flow Ratings
Flow rating:
  • 4.0 lpm (1.0 gpm) Port 1 to port 3 (coil de-energized)
Maximum internal leakage:
  • 33 ml/min (2 in³/min) At 26 bar (375 psi)
Hysteresis per cent:
  • 3 % (PWM)
Temperature Ratings
Operating fluid temperature:
  • -40 to 100 °C (-40 to 212 °F) With buna N seals
  • -26 to 204 °C (-15 to 400 °F) With fluorocarbon seals
  • -54 to 107 °C (-65 to 225 °F) With polyurethane seals
Storage temperature:
  • -40 to 70 °C (-40 to 160 °F)
Ambient temperature:
  • -40 to 70 °C (-40 to 160 °F)
Other Ratings
Corrosion protection:
  • 960 hr salt spray per ASTM b117 (gehpr08-33x)
Fluids:
  • Mineral based or synthetic with lubricating properties
Fluid viscosity range:
  • 7.4 to 420 cSt
Maximum operating contamination level:
  • 18/16/13 per ISO 4406
Adjustment torque:
  • 0.9 to 2.0 N-m (8.8 to 17.7 in-lb)
Unit weight:
  • 0.14 kg (0.31 lb)
Internal wetted surface area:
  • 90 cm² (13.9 in²)
Valve inductance:
  • 53 mH E-series coil 12 V
  • 223 mH E-series coil 24 V
  • 25 mH D-series coil 10 V
  • 35 mH D-series coil 12 V
  • 130 mH D-series coil 20 V
  • 180 mH D-series coil 24 V
Maximum control current:
  • 1.42 A E-series coil 12 V
  • 0.71 A E-series coil 24 V
  • 1.5 A D-series coil 10 V
  • 1.2 A D-series coil 12 V
  • 0.75 A D-series coil 20 V
  • 0.65 A D-series coil 24 V
EHPR08-33_Perf_Chrt1 EHPR08-33_Perf_Chrt3 EHPR08-33_Perf_Chrt2
EHPR08-33_Dim_Dwg

Materials

Cartridge: Weight: 0.25 kg (0.55 lb); Steel with hardened work surfaces. Zinc-plated exposed surfaces; O-rings standard.

Standard Ported Body: Weight: 0.16 kg (0.35 lb); Anodized high-strength 6061 T6 aluminum alloy, rated to 207 bar (3000 psi); Ductile iron bodies available; dimensions may differ.

D-Coil: Weight each: 0.11 kg (0.25 lb); Unitized thermoplastic encapsulated, Class H high temperature magnet wire.

E-Coil: Weight: 0.14 kg (0.3 lb); Perfect wound, fully encapsulated with rugged external metal shell; Rated up to IP69K with integral connectors.

Cavity:
Cartridge installation torque:
  • 25.8 to 28.6 N-m (19 to 21 ft-lb)
Coil nut torque:
  • 6.8 to 9.5 N-m (5 to 7 ft-lb)
Orientation restriction:
  • None
EHPR08-33_Order
POSITION
CODE
DESCRIPTION
EHPR08-33E-H-J-L
E
Manual Override
E
BLANK
NONE
E
M
Variable Position Override, Red Knurled Knob
H
Line Body
H
0
No Body
H
4T
Aluminum SAE 4
H
6T
Aluminum SAE 6
H
6TD
Ductile Iron SAE 6
H
8TD
Ductile Iron SAE 8
H
3B
Aluminum BSPP 3/8" (3)
H
3BD
Ductile Iron BSPP 3/8" (3)
J
Seal
J
N
Buna-N
J
V
Fluorocarbon
J
P
Polyurethane
J
U
PPDI Urethane
L
Coil
L
0
No Coil
L
12DG
12 VDC, D-Coil, DIN 43650
L
12ER
12 VDC, E-Coil, Deutsch
L
12EY
12 VDC, E-Coil, Metri-Pack 150
L
24DG
24 VDC, D-Coil, DIN 43650
L
24DL
24 VDC, D-Coil, Dual Lead Wires
L
24DS
24 VDC, D-Coil, Dual Spade
L
24ER
24 VDC, E-Coil, Deutsch