DIRECTIONAL VALVES

EP20-S35 Piloted Spool-Type Logic Element

DESCRIPTION

A spool-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-S35 is a spring-biased blocking valve which will shift to allow full ﬂ ow from

➀ to ➁ only when pressure at ➀ exceeds the cumulative pressure of ➂, plus the bias

spring pressure value.

EP20-S35 is a pilot-to-close directional valve.

With no pressure at

➂, ﬂ ow will be allowed from ➀ to ➁ once the bias spring force

is overcome with pressure at

➀.

FEATURES

• Multiple function/application potential.

• Low pressure drop.

• Industry common cavity.

RATINGS

Maximum Operating Pressure: Cartridge Only: Ports ➀ & ➁: 345 bar (5000 psi);

Port

➂: 320 bar (4600 psi); Polyurethane seals are recommended for operation

over 240 bar (3500 psi). Aluminum bodies are rated for 207 bar (3000 psi).

Flow: See Performance Chart

Internal Leakage: 1 cc/minute (1 cu. in./minute) max. at 345 bar (5000 psi)

Bias Spring Pressure Options: 5.5 bar (80 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:

PERFORMANCE (Cartridge Only)

SYMBOLS

4.503.1

6.9/100

5.5/80

151

227

FLOW lpm/gpm

PRESSURE DROP bar/psi

303

379

100

~ to  (fully open)

32 cSt/150 ssu oil at 40nC

2.8/40

4.1/60

1.4/20

HYDRAFORCE

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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 available; dimensions

may differ. See page 8.020.1.

MATERIALS TO ORDER

EP20-S35

4.503.2

DIMENSIONS

EP20-S35 - __ __ __ - __ - __ __

Seals

N Buna N (Std.)

V Fluorocarbon

P Polyurethane

(for pressures

over 240 bar/3500 psi)

Bias Spring

20 1.4 bar (20 psi)

80 5.52 bar (80 psi)

160 11.0 bar (160 psi)

Porting

Cartridge Only 0

SAE 16 w/SAE 6 Pilot Port 16T

HYDRAFORCE

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