DIRECTIONAL VALVES
EP20-S38 Piloted Poppet-Type Logic Element
DESCRIPTION
A poppet-type, screw-in, cartridge-style, hydraulic directional element, with multi-
function potential when used with other directional, pressure, or fl ow control devices.
OPERATION
The EP20-S38 is a spring-biased poppet valve which will block ➀ to ➁ or ➁ to ➀ until
pressure at
➀ or ➁ exceeds the cumulative pressure at ➂ and bias spring. With no
pressure at
➂, fl ow will be allowed from ➀ to ➁ or ➁ to ➀ once the bias spring force
is overcome with pressure at
➀ or ➁. When the element is in the closed state, the
ratio of areas
➀ and ➁ is 1:1, and the ratio of areas ➀ or ➁ to ➂ is 1:2.
FEATURES
• Multiple function/application potential.
• Low pressure drop.
• Industry common cavity.
RATINGS
Maximum Operating Pressure: Cartridge Only: Ports ➀ & ➁, 241 bar (3500 psi)
Flow: See Performance Chart
Internal Leakage: 0.6 cc/minute (12 drops/minute) max. at 241 bar (3500 psi)
Bias Spring Pressure Options: 2.8 bar (40 psi); 11.0 bar (160 psi)
Temperature: -40 to 120°C with standard Buna 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: VC20-S3; See page 9.120.1
Cavity Tool: CT20-S3xx; See page 8.600.1
Seal Kit: SK20-S3x-MM; See page 8.650.1
USASI: ISO:
SYMBOLS
4.513.1
PERFORMANCE (Cartridge Only)
2
3
1
2
3
1
6.9/100
5.5/80
76
20
151
40
227
60
FLOW lpm/gpm
PRESSURE DROP bar/psi
303
80
➀ to ➁ or ➁ to ➀ (fully open)
and with port ➂ vented
32 cSt/150 ssu oil at 40°C
2.8/40
4.1/60
1.4/20
2
3
1
HYDRAFORCE
.com
®
Blue rectangles are links to other catalog pages.
Cartridge: Weight: 0.82 kg. (1.8 lbs.)
Steel with hardened work surfaces.
Zinc-plated exposed surfaces.
Buna N O-rings and polyester
elastomer back-ups standard.
Standard Ported Body: Weight:
1.65 kg. (3.65 lbs.) Anodized high-
strength 6061 T6 aluminum alloy,
rated to 207 bar (3000 psi). Ductile
iron bodies can be made available;
dimensions may differ.
See page 8.020.1.
MATERIALS TO ORDER
EP20-S38 - __ __ __ - __ - __ __
EP20-S38
4.513.2
Porting
Cartridge Only 0
SAE 16 w/SAE 6 Pilot Port 16T
DIMENSIONS
Seals
N Buna N (Std.)
V Fluorocarbon
Bias Spring
40 2.8 bar (40 psi)
80 5.5 bar (80 psi)
160 11.0 bar (160 psi)
MILLIMETRE
INCH
ORIFICE DISCS SHOULD NOT
BE USED WITH THIS PRODUCT
2.48
63.0
4.00
101.6
1.87
47.5
1.30
33.1
3.03
76.9
0.19
4.8
4.38
111.3
5.00
127.0
3
0.81
20.6
3.62
91.9
1
2
0.34
8.6
2.00
50.8
1.88
47.6
ACROSS FLATS
TORQUE: 70 ft-lbs
(95.0 Nm) max.
1
2
3
®
HYDRAFORCE
HYDRAFORCE
.com
®
Blue rectangles are links to other catalog pages.
