DIRECTIONAL VALVES
DC08-40 Pilot Operated Check Valve
DESCRIPTION
A dual pilot operated check valve for use in blocking or load-holding circuits.
OPERATION
The DC08-40 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.
An optional spring biased at 135 psi is available.
Note: Orifice disc cannot be used with this product.
FEATURES
• Hardened seat for long life and low leakage.
• Low pressure drop.
RATINGS
Operating Pressure: Inlet: 240 bar (3500 psi)
Flow: Rated Inlet Flow: 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)
Leakage: 5 drops per minute (0.25 ml per minute) at 3000 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: VC08-4; See page 9.108.1
Cavity Tool: CT08-4XX-X-X; See page 8.600.1
Seal Kit: SK08-4X-MMM; See page 8.650.1
USASI:
SYMBOLS
4.200.1
PERFORMANCE (Cartridge Only)
2
3
4
1
ISO:
10.4/150
6.9/100
3.5/50
3.8
1
15.2
4
FLOW lpm/gpm
PRESSURE DROP bar/psi
32 cSt/150 ssu oil at 40°C
19.0
5
13.8/200
7.6
2
11.4
3
1 to 2
2 to 1
4 to 3
3 to 4
HYDRAFORCE
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®
Blue rectangles are links to other catalog pages.
DC08-40 - __ - __ __ - __ __ __
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:
0.18 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
DIMENSIONS
MATERIALS TO ORDER
Porting
Cartridge Only 0
SAE 6 6T
1/4 in. BSP* 2B
3/8 in. BSP* 3B
*BSP Body;
U.K. Mfr. Only
DC08-40
4.200.2
2
2
3
3
4
4
1
1
2.19
55.6
0.31
7.9
INCH
MILLIMETRE
1.13
28.7
0.87
22.2
1.25
31.8
2.50
63.5
1.17
29.7
2.84
72.1
3.25
82.6
2.00
50.8
0.60
15.2
1.73
43.9
0.28
7.1
0.25
6.4
TORQUE: 20 ft-lbs.
(27.1 Nm) max.
Bias Spring
25 1.7 bar (25 psi) Standard
135 9.3 bar (135 psi) Optional
Seals
N Buna N (Std.)
V Fluorocarbon
®
HYDRAFORCE
HYDRAFORCE
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®
ORIFICE DISC
CANNOT BE USED
WITH THIS PRODUCT
Blue rectangles are links to other catalog pages.
