Directional Valves

DCFC08-40 — Dual Pilot-Operated Check Valve with Adjustable Flow Control
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DCFC08 Valve

SYMBOL:
DCFC08 Valve symbol

DESCRIPTION
A dual pilot-operated check valve with built-in adjustable flow control in one direction (port 4 to 3),
for use in blocking or load-holding circuits.

OPERATION
The DCFC08-40 will block flow from ports 1 to 2 and from 4 to 3. Flow is allowed in the opposite
direction when pressure is applied to port 2 and/or port 3. Flow in the 4 to 3 direction can be adjusted
by rotating the adjusting screw. For maximum flow, rotate the adjusting screw clockwise. For minimum
flow, rotate it counterclockwise. When flow in the 4 to 3 direction is adjusted to the maximum setting,
pressure drop from 3 to 4 will be at the highest. At the minimum setting, pressure drop in the 3 to 4
direction will be at the lowest. The valve has a 3:1 pilot ratio, so at least 1/3 of the load pressure at
port 1 or 4 is required at the pilot lines (ports 2 or 3) to open the flow passage to allow flow from ports
1 or 4. The check is spring-biased to assure holding in a static or no-load condition.

FEATURES
• Multi-function - built-in adjustable flow control.
• Hardened seat for long life and low leakage.
• Three spring sizes available - 25, 85 and 135.
• Sealed spool option available with 135 psi spring only.

RATINGS
Operating Pressure: Inlet: 207 bar (3000 psi)
Flow Rating:19 lpm (5 gpm); see performance chart
Pilot Ratio: 3:1
Check Spring Bias: 1.7 bar (25 psi); Optional 9.3 bar (135 psi)
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 and urethane 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: VC08-4; See page 9.108.1_4w
Cavity Tool: CT08-4xx-x-x; See page 8.600.1
Seal Kit: SK08-4x-MMM; See page 8.650.1



 

 

PERFORMANCE:

DCFC08 Valve Performance Chart
DCFC08 Valve Performance Chart2

 



DCFC08 Valve Performance Chart3

 

DIMENSIONS:
DCFC08 Valve Dimensions

MATERIALS:

Cartridge Including Coil: Weight: 0.14 kg.
(0.3 lbs.) Steel with hardened work surfaces.
Zinc-nickel plated exposed surfaces.HNBR
seals standard. Coil is encapsulated, Class
N high- temperature magnet wire,with
zinc-nickel plated shell.

Standard Ported Body: Weight: 0.18 kg.
(0.40 lbs.); Anodized high-strength 6061 T6 aluminum alloy, rated to 207 bar (3000 psi).
Ductile iron bodies available; dimensions may differ.
See page 8.008.1_4w.

ORDERING CHART:

DCFC08 Ordering Chart

 


Selection guide - similar valves.
PDF file of this page. Request a quote.