Electro-Proportional Valves — Pressure Control

EHPR98-T38B — Proportional, Reducing / Relieving, Drop-in
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EHPR98-T38B Valve

SYMBOL:
EHPR98-T38B Valve symbol
DESCRIPTION
A drop-in, flange mount, direct-acting, 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. The E-coil is an integral part of the valve assembly, and cannot be replaced or field-serviced.

OPERATION
The EHPR98-T38B 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.
Note: Operation of manual override option: Rotate manual override screw colockwise until desired regulated pressure is achieved.

FEATURES
• 10, 12, 20 or 24 VDC coils.
• 1000-hour salt spray protection.
• Economical drop-in style.
• Several push-on termination options.
• Integral waterproof coil standard.
• Optional 142 micron screen at port 2.

RATINGS
Max. Inlet Pressure: 241 bar (3500 psi) at Port 2; 57 bar (820 psi) at Port 1;
   34 bar (500 psi) at Port 3
Burst Pressure: 379 bar (5500 psi) (Ports 1 and 2 pressurized).
Max. Internal Leakage: Energized: 393 ml/min.(24 cu. in/min.) at 241 bar (3500 psi);
   De-energized: 100 ml/min. (6 cu. in/min.) 241 bar (3500 psi)
Control Pressure at Max. Control Current: 56.6 bar (820 psi)
Max. Control Current: 1.38 amps for 10 VDC coil; 1.30 amps for 12 VDC coil;
   0.69 amps for 20 VDC coil; 0.65 amps for 24 VDC coil
Resistance: 4.3 ohm (10V), 5.2 ohm (12V), 17.5 ohm (20V), 20.9 ohm (24V)
Inductance: 80 mH (12V)
Hysteresis: at 100 Hz PWM: 5% of max. control pressure
Rated Flow: 18.9 lpm (5.0 gpm)
Cycle Life: One million cycles
Oil Operating Fluid Temperature: -40° to 149°C (-40° to 300°F)
Storage Temperature: -40° to 70°C (-40° to 160°F)
Ambient Air Temperature: -40° to 80°C (-40° to 176°F)
Environmental Rating: IP69K
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 Mount
Mounting Screws: M4 x 0.7 x 12 Long; Part No. 4001015 (not provided with valve)
Cavity: VC-T011; See page 9.111.1
Cavity Tool: CT-T011R0-x-G; See page 8.600.1
Seal Kit: SKT011-N; SK-T011-V; 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:

EHPR98-T38B Valve Performance Chart

 


EHPR98-T38B Valve Performance Chart

 


EHPR98-T38B Valve Performance Chart
DIMENSIONS:

EHPR98-T38B Valve Dimensions

 


MATERIALS:

Cartridge including Coil:
Weight: 0.32 kg (0.70 lb); Steel with hardened work surfaces. Zinc-plated exposed surfaces; HNBR O-rings standard. Coil is encapsulated, class H high temperature magnetwire, with zinc-nickel plated shell.

Ported Test Body: Consult Factory.

Mounting Screws: Must be ordered separately; Part no. 4001015

 

ORDERING CHART:

EHPR98-T38B Ordering Chart