DIRECTIONAL VALVES

DESCRIPTION

A screw-in, cartridge-style, bypass-type, pressure-compensating element, with inte-

gral ﬂ ow regulator for load sense signal drain. The internal pressure-compensated

ﬂ ow regulator restricts the load signal bleed ﬂ ow in order to minimize system losses

even at high operating pressures. The main compensator element holds the valves

primary ﬂ ow constant regardless of load pressure changes.

OPERATION

The EPFR50-S35 is a spring-biased spool-type valve with an internal pressure-com-

pensated ﬂ ow regulator between

➁ and ➂. When used as a pump unloading com-

pensator, this valve will bypass ﬂ ow to tank at port

➁ when system pressure reaches

the load pressure plus the bias spring value. When the system load is neutralized, the

load signal is bled through the ﬂ ow regulator bringing the valve to stand-by condition.

FEATURES

• Multiple function in a single cavity.

• Low bleed ﬂ ow throughout the operating pressure range.

• High system efﬁ ciency.

• Industry common cavity

RATINGS

Operating Pressure: Cartridge only: 345 bar (5000 psi);

Aluminum housing: 207 bar (3000 psi); Ductile iron housing: 345 bar (5000 psi).

Flow: See Performance Chart

Maximum Flow Loss between

➂ and ➁: 0.95 lpm (0.25 gpm) at 345 bar (5000 psi)

Bias Spring Pressure Options:

5.5 bar (80 psi);

7.6 bar (110 psi)

11.0 bar (160 psi) Tall Cap Required

15.9 bar (230 psi) Tall Cap Required

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: VC10-S3; See page 9.110.1

Cavity Tool: CT10-S3xx; See page 8.600.1

Seal Kit: SK10-S3x-MM; See page 8.650.1

PERFORMANCE (Cartridge Only)

SYMBOL

4.462.1

HYDRAFORCE

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10.3/150

13.8/200

17.2/250

20.7/300

24.1/350

27.6/400

31.0/450

6.9/100

3.4/50

7.6

15.1

22.7

30.3

37.9

45.4

53.0

60.6

68.1

75.7

PRESSURE DROP bar/psi

FLOW lpm/gpm

Inlet Pressure vs. Bypass Flow at No-Load Flow Demand

32 cSt/150 sus oil at 40nC

160 psi Spring

110 psi Spring

80 psi S

ing

230 psi Spring

22.7/6

30.3/8

37.9/10

45.4/12

53.0/14

60.6/16

68.1/18

75.7/20

15.1/4

7.6/2

1000

138

2000

207

3000

276

4000

345

5000

FLOW lpm/gpm

PRESSURE bar/psi

Flow vs. Load Pressure

32 cSt/150 sus oil at 40nC

EPFR50-S35 Pressure Compensator with Internal

Blue rectangles are links to other catalog pages.

DIMENSIONS

Cartridge: Weight: 0.15 kg. (0.32 lbs.)

with standard. short cap; 0.28 kg.

(0.62 lbs.) with tall cap. Steel with

hardened work surfaces. Zinc-plated

exposed surfaces. Buna N O-rings

and polyester elastomer back-ups

standard.

Standard Ported Body: Weight:

0.32 kg. (0.70 lbs.) Anodized high-

strength 6061 T6 aluminum alloy,

rated to 207 bar (3000 psi). Ductile

iron (8TD) bodies are available for

pressures up to 350 bar (5000 psi);

Weight and dimensions may differ.

See page 8.010.1

MATERIALS TO ORDER

EPFR50-S35

4.462.2

EPFR50-S35__ - __ __ __ - __ - __ __

Bias Spring

80 5.52 bar (80 psi)

110 7.6 bar (110 psi)

‡

160 11.0 bar (160 psi)

‡

230 15.9 bar (230 psi)

Porting

Cartridge Only 0

SAE 8* 8T

SAE 8* 8TD

SAE 10* 10T

SAE 12* 12T

*SAE 6 pilot port

Option

None

(Blank)

Tall Cap T

Seals

N Buna N (Std.)

V Fluorocarbon

P Polyurethane

(for pressures

over 240 bar/3500 psi)

‡ T Option required

Ductile iron (8TD) bodies

are available for pressures

up to 350 bar (5000 psi).

HYDRAFORCE

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TORQUE

24 – 26 ft-lbs

32.6 – 35.4 Nm

Load-Sense Drain Flow Control

Blue rectangles are links to other catalog pages.