DIRECTIONAL VALVES

DCV12 Lock Valve

DESCRIPTION

An in-line-housed, double-pilot-operated, hydraulic check valve for use in 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.

The valve has a 4:1 pilot ratio, so 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 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 cartridge thermal relief(s).

• Optional sealed piston.

• Optional spring ranges.

• Low pressure drop.

RATINGS

Maximum Operating Pressure: 241 bar (3500 psi)

Flow: See Performance Chart

Internal Leakage Cx to Vx: 0.25 cc/minute (5 drops/minute) max.

at 207 bar (3000 psi);

Vx to Vx (without sealed piston): 328 cc/minute (20 cu. in./minute) max.

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)

Thermal Relief Reseat: 207 bar (3000 psi) minimum.

Operating Temperature: -40°C to 120°C (-40°F to 248°F) 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 CV12-2x): SK12-2x-T (2 required); See page 8.650.1

Pilot Piston Service Part Numbers:

O-Ring (1) – Buna 6001115, Fluorocarbon 6003115

Back-up (2) – Fluorocarbon 6011115 (all)

USASI:

SYMBOLS

4.252.1

ISO:

PERFORMANCE (Cartridge Only)

1.7/25

3.4/50

5.2/75

6.9/100

18.9

37.9

56.8

FLOW lpm/gpm

PRESSURE DROP bar/psi

1 to 2

with 1.7 bar/25 psi spring

32 cSt/150 sus oil at 40°C

75.8

94.6

HYDRAFORCE

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Blue rectangles are links to other catalog pages.

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.

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 8.012.1.

Product Weight: 2.4 kg. (5.3 lbs.)

DCV12

DIMENSIONS

MATERIALS

TO ORDER

4.252.2

Porting

SAE 10 10T

SAE 12 12T

SAE 16 16T

DCV12- __ __ - __ - __ - __ __

Bias Spring

(Blank) 1.7 bar (25 psi) (Std.)* N and V

(Blank) Thermal Relief Option

(Blank) 4.1 bar (60 psi) NS and VS

30 2.1 bar (30 psi) N and V

40 2.8 bar (40 psi) N and V

50 3.4 bar (50 psi) N and V

60 4.1 bar (60 psi) N and V

80 5.5 bar (80 psi) N, V, NS and VS

Seals

Buna N (Std.) N

Fluorocarbon V

Buna N w/Sealed Piston NS

(4.1 bar/60 psi spring minimum)

Fluorocarbon w/Sealed Piston VS

(4.1 bar/60 psi spring minimum)

Note: Both check valves must

have same spring value.

* DCV12 valves built with standard

25 psi spring are not stamped with

spring rating. Other spring ratings

are stamped on valve.

Options

None

(Blank)

Thermal Relief on C1 1

Thermal Relief on C2 2

Thermal Relief on C1 and C2 3

Thermal Relief Spring Value: 4.9 bar (65 psi) N, V, NS and VS

Check Valve Spring Value: 1.7 bar (25 psi) N and V

Check Valve Spring Value: 4.1 bar (60 psi) NS and VS

HYDRAFORCE

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Blue rectangles are links to other catalog pages.