DIRECTIONAL VALVES
DCV08 Lock Valve
DESCRIPTION
An in-line-housed, double-pilot-operated, hydraulic check valve for use in blocking
or load holding circuits.
OPERATION
The DCV08 allows flow from V ports to C ports, while normally blocking flow in the
opposite direction. Flow will be allowed from C to V when pressure is applied to the
opposite side V port.
The valve has a 4:1 pilot ratio, so approximately one-fourth of the load pressure held
at either C port is required at the opposite V port to open the flow passage.
The check is spring-biased at 1.7 bar (25 psi) to assure holding in static or no-load
conditions. An optional sealed piston with check spring bias of 6.9 bar (100 psi) is
available.
FEATURES
• Hardened seat for long life and low leakage.
• Check section serviceable as a cartridge.
• Optional sealed piston.
• Optional spring ranges.
• Low pressure drop.
RATINGS
Flow: See Performance Chart
Internal Leakage Cx to Vx: 0.25 cc/minute (5 drops/minute) max.
at 207 bar (3000 psi)
V1 to V2 (without sealed piston): 328 cc/minute (20 cu. in./minute) max.
at 240 bar (3500 psi)
Pilot Ratio: 4:1
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
Seal Kit (for CV08-2x): SK08-2x-T (2 required); See page 8.650.1
Pilot Piston Service Part Numbers:
O-Ring (1) – Buna 6001012, Fluorocarbon 6003012
Back-up (2) – Buna 6011012, Fluorocarbon
6011012
USASI:
SYMBOLS
ISO:
PERFORMANCE (Cartridge Only)
4.250.1
8.6/125
6.9/100
5.2/75
3.4/50
1.7/25
15.1
4
30.2
8
FLOW lpm/gpm
PRESSURE DROP bar/psi
V to C — (r); C to V - - - (p)
32 cSt/150 sus oil at 38°C
7.5
2
22.7
6
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Cartridge: (CV08-20): Steel with
hardened work surfaces.
Zinc-plated exposed surfaces.
Buna N O-rings and back-up
standard.
Pilot Piston: Hardened steel.
Standard Ported Body: 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
Product Weight: 0.58 kg. (1.28 lbs.)
DCV08
Seals
Buna N (Std.) N
(1.7 bar/25 psi spring minimum required)
Fluorocarbon V
(1.7 bar/25 psi spring minimum required)
Buna N w/Sealed Piston NS
(6.9 bar/100 psi spring minimum required)
Fluorocarbon w/Sealed Piston VS
(6.9 bar/100 psi spring minimum required)
Porting
SAE 6 6T
SAE 8 8T
1/4 in. BSP* 2B
3/8 in. BSP* 3B
*BSP Body;
U.K. Mfr. Only
DIMENSIONS
MATERIALS
TO ORDER
4.250.2
DCV08- __ __ - __ - __ __ __
Bias Spring
(Blank) 1.7 bar (25 psi) (Std.)*
60 4.1 bar (60 psi)
80 5.5 bar (80 psi)
100 6.9 bar (100 psi)
150 10.3 bar (150 psi)
200 13.8 bar (200 psi)
270 18.3 bar (270 psi)
Note: Both check valves must
have same spring value.
* DCV08 valves built with standard 25 psi
spring are not stamped with spring rating.
Other spring ratings are stamped on valve.
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