EHPR98-G38 Proportional Reducing/Relieving
ISO SYMBOL
2.974.1
PERFORMANCE
% of MAX CONTROL CURRENT amps
PRESSURE bar/psi
Reducing Pressure vs. Current
12V Coil 100 Hz PWM
Reduced Pressure Port 2
G38C G38B G38A
6.9/100
13.8/200
20.7/300
20 40 60 10080
3.4/50
10.3/150
17.2/250
24.1/350
27.6/400
31.0/450
34.5/500
FLOW lpm/gpm
PRESSURE bar/psi
Pressure Drop vs. Flow
Cartridge Only
1 to 3 ; 2 to 1
3.4/50
6.9/100
10.3/150
13.8/200
17.2/250
7.6
2.0
15.1
4.0
22.7
6.0
30.2
8.0
20.7/300
2
3
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 pres-
sure is proportional to the input electrical current in the pressure ranges shown.
OPERATION
The EHPR98-G38 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. • Quick response time.
•
Mounting plate option. • Screen option.
•
Several regulated pressure ranges. • Top-mounted connector.
•
Retrofit option for EHPR98-T38. • Low leakage.
RATINGS
Pressure Rating: 34.5 bar (500 psi) at all ports
Proof Pressure: Ports 1 and 2: 207 bar (3000 psi) Port 3: 54 bar (780 psi)
Burst Pressure: 45 bar (652 psi) all ports pressurized
Flow Rating: 23 lpm (6 gpm)
Maximum Internal Leakage: De-energized: 50 ml/min (3.1 cu. in./min) @ 34.5 bar
(500 psi); Energized @ Imax: To be determined
Cycle Life: 10 million cycles
Operating Fluid Temperature: -40 to 149°C (-40 to 300°F), with standard HNBR
seals; -26 to 204°C (-15 to 400°F), with fluorocarbon seals
Maximum Control Current: 1.0 amps for 10 VDC coil; 0.88 amps for 12 VDC coil;
0.72 amps for 14 VDC coil; 0.52 amps for 20 VDC coil ; 0.44 amps for 24 VDC coil;
0.36 amps for 28 VDC coil.
Control Pressure at Maximum Control Current: 21 bar (305 psi) for EHPR98-
G38A; 25 bar (363 psi) for EHPR98-G38B; 30 bar (435 psi) for EHPR98-G38C
Hysteresis: 4% with 120 Hz PWM
Resistance: 4.8 ohm (10V), 7.2 ohm (12V), 10.0 ohm (14V), 18.3 ohm (20V);
29.5 ohm (24V), 40.3 ohms (28V)
Inductance: 77 mH (10V), 118 mH (12V), 165 mH (14V), 301 mH (20V), 446 mH
(24V), 680 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
Cavity: VC-G028 (Standard Configuration); VC-T011 (Retrofit Application);
See page 9.111.1
Cavity Tools: CT-G028 (Standard Configuration); CT-T011 (Retrofit Application);
See page 8.600.1
Seal Kit: SK-G028-X; See page 8.650.1
®
ELECTRO-PROPORTIONAL VALVES--PRESSURE CONTROLS
HYDRAFORCE
.com
®
Blue rectangles are links to other catalog pages.
PERFORMANCE
EHPR98-G38
2.974.2
(continued)
DIMENSIONS
Drop-In-Style
Valve
MATERIALS
Cartridge including Coil:
Weight: 0.27 kg. (0.60 lbs.)
Steel with hardened work
surfaces. Zinc-nickel plated
exposed surfaces. HNBR
seals standard. Coil is
encapsulated, Class M high-
temperature magnet wire,
with zinc-nickel plated shell.
Ported Body: Part No. 7161210
Mounting Screws (not
provided with valve): M5 x
0.8 x 12 mm Long, Part No.
4002609 (with standard VC-
G028 cavity); M4 x 0.7 x 12
Long; Part No. 4001015 (with
retrofit application VC-T011
cavity).
EHPR98-G38 __ __- __ __ - __ - __ __ __ __ __ __
TO ORDER
Voltage
10 10 VDC
12 12 VDC
14 14 VDC
20 20 VDC
24 24 VDC
28 28 VDC
Seals
G
Hydrogenated Nitrile (HNBR)
V Fluorocarbon
®
HYDRAFORCE
®
INCH
MILLIMETRE
2.81
71.4
1.62
41.1
Screen
Option
1.27
32.3
ER
Connector
Aluminum Body
Sold Separately
(See Materials)
2.61
66.4
2.67
67.8
EJ Connector
EY2A Connector
0.14
3.4
2.00
50.8
1.26
32.1
2.62
66.5
2.12
53.8
TYP
0.70
1 7. 8
0.09
2.3
SPOTFACE
0.28
7.1 TYP
0.25
6.4
2.13
54.0
Mounting plate
sold separately
Mounting screws
sold separately
2.62
66.5
Mounting Screw Torque
(M5) 2.2 - 3.0 ft-lbs (3–4 Nm)
(M4) 0.9 - 1.1 ft-lbs (1.2-1.5 Nm)
2
3
Screen Option
None (Blank)
142µm on Inlet Port 2 S
Diode
(Blank) None
Z Zener Diode,
Bidirectional
Relieving Pressure Port 1 to 3
Typical Relieving/Reducing Pressure vs. Flow Characteristic
Typical Relieving Pressure at Various %s of Maximum Control Current
Data Shown for EHPR98-G38
FLOW lpm/gpm
22.7
6.0
30.2
8.0
30.2
8.0
15.1
4.0
22.7
6.0
7. 6
2.0
15.1
4.0
7. 6
2.0
0
Reducing Pressure Port 2 to 1
30%
0%
% of MAXIMUM RELIEF PRESSURE
% of MAXIMUM REDUCING PRESSURE
50
0
25
75
100
125
150
50
25
75
100
125
150
0
35% Max. Control Current
55% Max. Control Current
70% Max. Control Current
100% Max. Control Current
Pressure
0
6.9/100
13.8/200
17.2/250
20.7/300
24.1/350
PRESSURE (bar/psi)
TIME seconds
1.051.031.01 1.021.000.99
Typical Step Response Curve - ON TIME
Inlet Pressure 34.5 bar/500 psi
DC Current; Regulated Port Blocked
Current
3.4/50
10.3/150
34.5/500
31.0/450
27.6/400
1.04
1.00
0.50
CURRENT (amps)
Termination
ER
Deutsch DT04-2P
EJ Amp Junior Timer
EY2A Metripack 150.2
Porting
Cartridge Only 0
SAE 6 6T
Maximum Regulated
Pressure
21 bar (305 psi) A
25 bar (363 psi) B
30 bar (435 psi) C
Current
Pressure
0
6.9/100
13.8/200
17.2/250
20.7/300
24.1/350
PRESSURE (bar/psi)
TIME seconds
2.032.01 2.022.001.99
Typical Step Response Curve - OFF TIME
Inlet Pressure 34.5 bar/500 psi
DC Current; Regulated Port Blocked
3.4/50
10.3/150
34.5/500
31.0/450
27.6/400
2.04
1.00
0.50
CURRENT (amps)
Mounting Plate
(Blank) None
G Standard Single
Valve Plate
T Retrofit Plate
HYDRAFORCE
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®
Blue rectangles are links to other catalog pages.
