Vickers | 4CS-03-F-21
4CS-03-F-21
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The 4CS-03-F-21 valve belongs to the Check Valves series produced by Vickers and provides one-direction flow control in hydraulic automation systems. A cracking pressure of 10 bar (150 psi) determines the upstream pressure needed to open the poppet, preventing seepage under lighter loads. The nominal flow rating of 50 l/min (12 gpm) defines the volume that can pass without excessive pressure loss and secures consistent actuator speed. A maximum operating pressure of 210 bar (3000 psi) allows use in high-pressure circuits. Compatibility with mineral oil and fire-resistant fluids broadens application range, while a Viton (FPM) seal maintains closure under high temperature and chemically aggressive conditions. An SAE straight thread connection mount integrates the valve with manifold ports that follow this common fastening standard.
The primary system port uses a 3/8-inch pipe size with a 0.7500-16 UNF-2B thread so the valve mates directly with common hose fittings. A 0.4375-20 UNF gauge port permits attachment of pressure instruments for routine monitoring, and a 0.5625-18 UNF-2B pilot control port gives access for remote venting or controlled release. Physical dimensions of 70.9 mm length, 59.4 mm width, and 122.2 mm height help designers allocate space inside compact power units. The unit’s weight of 2.7 kg (6 lb) allows one-person handling during installation or service, ensuring practical maintenance in field or factory environments.
Technical Specifications
Cracking Pressure
10 bar (150 psi)
Fluid Compatibility
Mineral Oil and Fire-Resistant Fluids
Gauge Port Thread
0.4375-20 UNF
Height
122.2 mm (4.81 in)
Length
70.9 mm (2.79 in)
Max Operating Pressure
210 bar (3000 psi)
Mount Type
SAE Straight Thread Connection
Nominal Flow Rating
50 l/min (12 gpm)
Pilot Control Port Thread
0.5625-18 UNF-2B
Port Size
3/8 in (pipe)
Port Thread (system)
0.7500-16 UNF-2B
Seal Material
Viton (FPM)
Weight
2.7 kg (6 lb)
Width
59.4 mm (2.34 in)
1620 Old Apex Road
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