Electro-Proportional Valves — Pressure Control

EHPR98-G33 — Proportional, Reducing / Relieving, Drop-in
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EHPR98-G33 Valve

SYMBOL:
EHPR98-G33 Valve symbol

 

DESCRIPTION
A direct-acting, spool-type, proportional, pressure reducing/relieving valve. It is a third 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 cannot be
replaced or field-serviced. The regulated pressure is proportional to the input electrical current in
the pressure ranges shown. There is an option for a higher inlet pressure; some performance
characteristics will vary.

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.
• Compact size.
• Retrofit option for EHPR98-T33.
• Quick response time.
• Inlet screen and pressure options.
• Top-mounted connector.
• Low leakage.

RATINGS
Pressure Rating: 45 bar (650 psi) at all ports; with Option A 103-241 bar (1500-3500 psi) at
   port 2 and 45 bar (650 psi) at port 3.
Proof Pressure: 54 bar (780 psi) at port 3; 345 bar (5000 psi) at ports 1 and 2
Burst Pressure: 258 bar (3750 psi) all ports pressurized
Flow Rating: 3.8 lpm (1.0 gpm)
Maximum Internal Leakage: De-energized: 60 ml/min (3.6 cu. in./min) @ 34.5 bar (500 psi);
   Energized @ Imax: 60 ml/min (3.6 cu. in./min) @ 34.5 bar (500 psi).
   With Option A: De-energized: 200 ml/min (12.2 cu.in./min) @ 241 bar (3500 psi)
   Energized @ Imax: 200 ml/min (12.2 cu.in./min) @ 241 bar (3500 psi)
Cycle Life: 10 million cycles
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.
Maximum Control Current: 1.1 amps for 10 VDC coil; 0.94 amps for 12 VDC coil;
   0.78 amps for 14 VDC coil; 0.56 amps for 20 VDC coil ; 0.47 amps for 24 VDC coil;
   0.39 amps for 28 VDC coil.
Control Pressure at Maximum Control Current: 30 bar (435 psi)
Hysteresis: 4% with 120 Hz PWM
Resistance: 4.8 ohms (10V), 7.2 ohms (12V), 10.0 ohms (14V), 18.3 ohms (20V);
   29.5 ohms (24V), 40.3 ohms (28V)
Inductance: 68 mH (10V), 104 mH (12V), 152 mH (14V), 284 mH (20V),
   433 mH (24V), 645 mH (28V)
Environmental Rating: IP69K; 1000-hour salt spray per ASTM B117
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: Flange Mounted. See page 8.525.1
Mounting Screws: M4 x 0.7 x 12 Long; Part No. 4001015 (not provided with valve)
Cavity: VC-G027 (Standard Configuration); VC-T009 (Retrofit Application); See page 9.111.1
Cavity Tool: CT-G027 (Standard Configuration) CT-T009 (Retrofit Application); See page 8.600.1
Seal Kit: SK-G027-X; 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.



 

 

PERFORMANCE:

EHPR98-G33 Valve Pressure vs Flow
EHPR98-G33 Valve Step Response

 


EHPR98-G33 Valve Frequency Response Curves

 

EHPR98-G33 Valve Relieveing/Reducing
DIMENSIONS:

EHPR98-G33 Valve Dimensions

 

 


MATERIALS:

Cartridge Including Coil: Weight: 0.26 kg.
(0.57 lbs.) Steel with hardened work surfaces. Zinc-nickel plated exposed surfaces. HNBR seals standard. Coil is encapsulated,
Class N high- temperature magnet wire,
with zinc-nickel plated shell.

Ported Test Body: Part No. 71611X0
Mounting Screws: Must be ordered
separately; M5 x 0.8 x 12 mm
Long, Part No. 4002609 (with standard
VC-G027 cavity); M4 x 0.7 x 12
Long; Part No. 4001015 (with retrofit application VC-T009 cavity).

 

ORDERING CHART:

EHPR98-G33 Ordering Chart