Electro-Proportional Valves — Pressure Control

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

EHPR08-33 Valve symbol


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.

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.

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

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

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




EHPR08-33 Valve Performance Chart


EHPR08-33 Valve Performance Chart


EHPR08-33 Valve Performance Chart



EHPR08-33 Valve Dimensions



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

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_3w.

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.



EHPR08-33 Ordering Chart