Directional Valves

DCV12 — Lock Valve

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DESCRIPTION
An in-line housed, double pilot-operated, hydraulic check valve for blocking or load-holding circuits.

OPERATION
The DCV12 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.
This valve has a 4:1 pilot ratio, meaning that at least 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 pilot piston with check spring bias of 4.1 bar (60 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.
• Check section is serviceable as a cartridge.

RATINGS
Operating Pressure: 240 bar (3500 psi)
Flow: up to 94.6 lpm (25 gpm)
Maximum Internal Leakage:
   Cx to Vx: 0.25 cc/minute (5 drops/minute) at 207 bar (3000 psi)
   Vx to Vx: (without sealed piston) 328 cc/minute (20 cu. in./minute) at 240 bar (3500 psi)
Pilot Ratio: 4:1
Check Spring Bias: 1.7 bar (25 psi); with sealed piston option: 4.1 bar (60 psi)
Optional Thermal Relief Factory Setting: 348 ± 38 bar (5050 ± 550 psi)
Temperature: -40° to 100°C (-40° to 212°F) with Buna seals;
   -26° to 204°C (-15° to 400°F) with Fluorocarbon 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 CV120-2x): SK12-2x-T (2 required); See page 8.650.1
Pilot Piston Service Part Numbers:
   O-Ring (1): Buna 6001115; Fluorocarbon 6003115
   Back-ups (2): Fluorocarbon 6011115 (all)

MATERIALS:

Cartridge (CV12-20): Steel with hardened work surfaces. Zinc-plated exposed surfaces; Buna N O-rings and polyester elastomer back-ups standard.

Pilot Piston: Hardened Steel.

Ported Body: Anodized high-strength
6061 T6 aluminum alloy, rated to
207 bar (3000 psi). Ductile iron bodies available; dimensions may differ; consult factory.

Product Weight: 2.4 kg. (5.3 lbs.).

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