Vickers | 4CG03A21
4CG03A21
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The 4CG03A21 valve belongs to the Check Valves series produced by Vickers for hydraulic automation circuits that need positive load holding and controlled release. It is a pilot-operated check design, so reverse flow remains blocked until an external pilot line supplies the required pressure. A nominal valve size of 03 aligns the ports with 3/8-inch pipe or 1/2-inch tube systems, and a nominal flow rating of 50 L/min keeps pressure drop within acceptable limits during steady operation. The unit tolerates a maximum operating pressure of 210 bar, allowing it to work in high-pressure mobile or industrial manifolds. Initial opening occurs at a cracking pressure of 2 bar, which minimizes unintended leakage while still permitting prompt response. A pilot-to-check area ratio of 3.11:1 establishes the pilot pressure needed to unlock the poppet, and the absence of a decompression feature means downstream pressure is released instantly once the valve opens.
Installation uses a Subplate (G) mounting interface, enabling quick replacement without disturbing hard plumbing. Overall dimensions of 122.174 mm in height, 87.376 mm in length, and 74.422 mm in width help designers allocate manifold space accurately, while an approximate weight of 3.6 kg allows single-person handling during service. A gage port threaded at .4375-20 UNF provides a convenient location for a pressure instrument during system setup or troubleshooting. The valve must receive oil filtered to ISO 18/15 cleanliness so internal sealing surfaces remain free of abrasive particles and maintain tight shutoff.
Technical Specifications
Approximate Weight
3.6 kg (8 lb)
Cracking Pressure
2 bar (30 psi)
Decompression Feature
None
Fluid Cleanliness
ISO 18/15
Gage Port Thread
.4375-20 UNF
Height
122.174 mm (4.810 in)
Length
87.376 mm (3.440 in)
Max Operating Pressure
210 bar (3000 psi)
Mounting Interface
Subplate (G)
Nominal Flow Rating
50 L/min (12 US gpm)
Nominal Valve Size
03 (3/8 in pipe or 1/2 in tube)
Pilot-to-check Area Ratio
3.11:1
Valve Type
Pilot Operated Check
Width
74.422 mm (2.930 in)
1620 Old Apex Road
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