Electro-Proportional Valves — Pressure Control

EHPR98-T33 — Proportional, Reducing / Relieving, Drop-in
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EHPR98-T33 Valve

SYMBOL:
EHPR98-T33 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-T33 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: Back pressure on port 3 becomes additive to the pressure setting at a 1:1 ratio.

FEATURES
• 10, 12, 20 or 24 VDC coils.
• Economical drop-in style.
• Integral waterproof coil standard.
• Corrosion-resistant plating.
• Manual override and screen options.
• Several push-on termination options.

RATINGS
Max. Inlet Pressure: 241 bar (3500 psi)
Common Port Burst Pressure: One cycle at 158 bar (2300 psi) on all ports
   simultaneously pressurized
Max. Tank Pressure at port 3: 34.5 bar (500 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
Control Pressure at Maximum Control Current: 30 bar (435 psi)
Resistance: 4.2 ohm (10V), 5.1 ohm (12V), 17.0 ohm (20V), 19.3 ohm (24V)
Inductance: 80 mH (12V)
Hysteresis: 4% with 100 Hz PWM
Rated Flow: 3.8 lpm (1.0 gpm)
Maximum Internal Leakage: De-energized: 200 ml/min (12 cu. in./min) @ 241 bar (3500 psi);
   Energized @ Imax: 400 ml/min (24 cu. in./min) @ 241 bar (3500 psi).
Step Response: TON <30 ms; TOFF <12 ms
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
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-T009; See page 9.111.1
Cavity Tool: CT-T009R0-x-G; See page 8.600.1
Seal Kit: SKEHPR98-T3x; 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-T33 Valve Performance Chart

 


EHPR98-T33 Valve Performance Chart

 


EHPR98-T33 Valve Performance Chart

 

DIMENSIONS:

EHPR98-T33 Valve Dimensions

 


MATERIALS:

Cartridge including Coil: Weight:
0.20 kg (0.44 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-T33 Ordering Chart