Directional Valves

EPFR50-S35 — Logic Element and Flow Regulator
   Selection guide - similar valves.
   PDF file of this page.
   STP file for EPFR50-S35.
   Request a quote.

EPFR50-S35 Valve

SYMBOL:
EPFR50-S35 Valve symbol

DESCRIPTION
A screw-in, cartridge-style, bypass-type, pressure-compensating element, with
integral flow regulator for load sense signal drain. The internal pressure-compensated
flow regulator restricts the load signal bleed flow in order to minimize system losses
even at high operating pressures. The main compensator element holds the valves
primary flow constant regardless of load pressure changes.

OPERATION
The EPFR50-S35 is a spring-biased spool-type valve with an internal pressure-compensated
flow regulator between 2 and 3. When used as a pump unloading compensator, this valve will
bypass flow to tank at port 2 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 flow
regulator bringing the valve to stand-by condition.

FEATURES
• Multiple function in a single cavity.
• Low bleed flow throughout the operating pressure range.
• High system efficiency.
• Industry-common cavity.

RATINGS
Operating Pressure: Cartridge only: 345 bar (5000 psi) with polyurethane seals;
   Aluminum housing: 207 bar (3000 psi); Ductile iron housing: 345 bar (5000 psi)
Flow: Up to 76 lpm (20 gpm)
Maximum Flow Loss: between 3 and 2: 0.95 lpm (0.25 gpm) at 345 bar (5000 psi)
Bias Springs: 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 100°C (-40 to 212°F) with Buna seals;
   -26 to 204°C (-15 to 400°F) with fluorocarbon seals;
   -54 to 107°C (-65 to 225°F) with polyurethane 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_3w
Cavity Tool: CT10-S3xx; See page 8.600.1
Seal Kit: SK10-S3x-MM; See page 8.650.1

PERFORMANCE:

EPFR50-S35 Valve Performance


DIMENSIONS:
EPFR50-S35 Valve Dimensions

MATERIALS:

Cartridge: Weight: 0.15 kg (0.32 lb)
with short cap; 0.28 kg (0.62 lb) with tall cap. Steel with hardened work surfaces. Zinc-plated exposed surfaces. Buna N
O-rings and polyester elastomer back-ups standard.

Ported Body: Weight: 0.32 kg (0.70 lb) 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_3w
  ORDERING CHART:

EPFR50-S35 Ordering Chart

Selection guide - similar valves.
PDF file of this page. STP file for EPFR50-S35 Request a quote.