DIRECTIONAL VALVES

EV20-S34 Vented 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 EV20-S34 is a spring-biased blocking valve which will shift to allow full ﬂ ow from

➀ to ➁ only when ➂ is vented to create a pressure drop across the internal oriﬁ ce

which exceeds the pressure value of the selected bias spring force.

EV20-S34 is a vent-to-open directional valve.

FEATURES

• Multiple function/application potential.

• Smooth shift transition.

• 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 5000 psi

operation. Aluminum bodies for this product are rated for 207 bar (3000 psi).

Flow: See Performance Chart

Internal Leakage: 1 cc/minute (1 cu. in./minute) max. at 320 bar (4600 psi)

Bias Spring Pressure Options: 3.5 bar (50 psi); 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:

SYMBOLS

PERFORMANCE (Cartridge Only)

4.523.1

6.9/100

5.5/80

151

227

FLOW lpm/gpm

PRESSURE DROP bar/psi

303

379

100

➀ to ➁ or ➁ to ➀ (fully open)

32 cSt/150 ssu oil at 40°C

2.8/40

4.1/60

1.4/20

HYDRAFORCE

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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 available; dimensions

may differ. See page 8.020.1.

MATERIALS

TO ORDER

EV20-S34 - __ __ __ - __ - __ __

Porting

Cartridge Only 0

SAE 16 w/SAE 6 Vent Port 16T

EV20-S34

4.523.2

DIMENSIONS

Seals

N Buna N (Std.)

V Fluorocarbon

P Polyurethane

(for pressures over

240 bar/3500 psi)

Bias Spring (Crack)

20 1.36 bar (20 psi)

50 3.5 bar (50 psi)

80 5.5 bar (80 psi)

160 11.0 bar (160 psi)

HYDRAFORCE

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Blue rectangles are links to other catalog pages.