Electro-Proportional Valves — Pressure Control

EHPR08-33 — Proportional, Reducing / Relieving
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EHPR08-33 Valve

SYMBOL:
EHPR08-33 Valve symbol

 

DESCRIPTION
A screw-in, cartridge-style, direct-acting, spool-type hydraulic 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. This valve is intended for use as a pressure
limiting device in demanding applications.

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.

FEATURES
• 12 and 24 volt coils standard.
• Optional manual override.
• Industry-common cavity.
• Optional waterproof E-Coils rated up to IP69K.

RATINGS
Max. Inlet Pressure at port 2: 207 bar (3000 psi)
Max. Tank Pressure at port 3: 34.5 bar (500 psi)
Max. Control Current: 1.2 amps for 12 VDC coil; 0.6 amps for 24 VDC coil;
   for other volatges, consult factory
Dither Frequency Required: 200 Hz
Hysteresis: less than 3%
Reducing/Relieving Pressure Range: from zero to max. control current:
   0 to 26 bar (0 to 375 psi)
Rated Flow: 4.0 lpm (1.05 gpm) ?P=6 bar (87 psi), cartridge only, 1 to 3 coil de-energized
Step Response: TON <30 ms; TOFF <12 ms
Flow Path: Free Flow: 1 to 3 coil de-energized; Reduced: 2 to 1 coil energized;
   Relieving: 1 to 3 coil energized
Temperature: -26° to 204°C (-15° to 400°F) with standard Fluorocarbon seals
Filtration: See page 9.010.1
Fluids: Mineral-based or synthetics with lubricating properties at viscosities of
   7.4 to 420 cSt (50 to 2000 sus); See Temperature and Oil Viscosity, page 9.060.1
Installation: No restrictions; See page 9.020.1
Cavity: VC08-3; See page 9.108.1_3w
Cavity Tool: CT08-3xx; See page 8.600.1
Seal Kit: SK08-3x-00; 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:

EHPR08-33 Valve Performance Chart

 

EHPR08-33 Valve Performance Chart

 

EHPR08-33 Valve Performance Chart

 

DIMENSIONS:

EHPR08-33 Valve Dimensions

 

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. See page 8.008.1_2w.

D-Coil: Weight each: 0.11 kg (0.25 lb);
Unitized thermoplastic encapsulated,
Class H high temperature magnetwire.
See page 3.200.1_EHPR.

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. See page 3.400.1_EHPR.

 

ORDERING CHART:

EHPR08-33 Ordering Chart