DIRECTIONAL VALVES
DC10-40 Pilot Operated Check Valve
DESCRIPTION
A dual pilot operated check valve for use in blocking or load-holding circuits.
This valve has an optional thermal relief from port 4 to port 3.
OPERATION
The DC10-40 will block flow from 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.
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 at 25 psi to assure holding in a static or no load condition.
Note: Orifice disc cannot be used with this product.
FEATURES
• Hardened seat for long life and low leakage.
• Low pressure drop.
• Optional thermal relief.
RATINGS
Operating Pressure: Inlet: 240 bar (3500 psi)
Flow: Rated Inlet Flow: 30.3 lpm (8 gpm); See performance chart.
Pilot Ratio: 3:1
Check Spring Bias: 1.7 bar (25 psi)
Thermal Relief Crack Pressure Range: 310 to 386 bar (4500 to 5600 psi)
Thermal Relief Valve Leakage: 5 drops per minute (0.25 ml per minute)
at up to 85% of crack pressure.
Maximum Check Valve Leakage: 5 drops per minute (0.25 ml per minute)
at 240 bar (3500 psi).
Temperature: –40 to 120°C with Buna N 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: VC10-4; See page 9.110.1
Cavity Tool: CT10-4XX-X-X; See page 8.600.1
Seal Kit: SK10-4X-MMM; See page 8.650.1
USASI:
SYMBOLS
4.201.1
PERFORMANCE (Cartridge Only)
ISO:
2
3
4
1
6.9/100
3.5/50
4.1/60
4.8/70
5.5/80
6.2/90
1.4/20
2.1/30
2.8/40
0.7/10
FLOW lpm/gpm
PRESSURE DROP bar/psi
32 cSt/150 sus oil at 40°C
30.3
8
15.1
4
7.6
2
22.7
6
3 to 4
4 to 3
2 to 1
1 to 2
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DC10-40__ - __ __ - __ - __ __
Cartridge: Weight: 0.13 kg. (0.28 lbs.)
Steel with hardened work surfaces.
Zinc-plated exposed surfaces.
Buna N O-rings and polyester
elastomer back-ups standard.
Standard Ported Body: Weight:
0.34 kg. (0.75 lbs.) Anodized high-
strength 6061 T6 aluminum alloy,
rated to 207 bar (3000 psi). Ductile
iron bodies available; dimensions
may differ. See page 8.010.1
DIMENSIONS
MATERIALS TO ORDER
Porting
Cartridge Only 0
SAE 6 6T
SAE 8 8T
1/4 in. BSP* 2B
3/8 in. BSP* 3B
*BSP Body;
U.K. Mfr. Only
DC10-40
4.201.2
Bias Spring
25 1.7 bar (25 psi) Standard
Seals
N Buna N (Std.)
V Fluorocarbon
Option
None
(Blank)
Thermal Relief T
®
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ORIFICE DISC
CANNOT BE USED
WITH THIS PRODUCT
Blue rectangles are links to other catalog pages.
