Parker Hannifin 4CS10A21 Pilot Operated Check Valve

The Vickers 4CS10A21 pilot-operated check valve (a Parker Hannifin product) provides one-way flow with a pilot release to hold loads and prevent reverse cylinder movement in hydraulic systems. Sized NG10 / CETOP 5 and designed for subplate or manifold mounting, it is commonly used in hydraulic power units, presses, lifting platforms, injection molding machines, and other industrial machinery where load holding and cylinder locking are required. It operates on hydraulic oil and compatible industrial fluids, carries configuration code A21, and uses an industrial‑duty valve body well-suited for manufacturing and process automation environments. Common replacements include Vickers 4CG-10-C-11, Eaton Vickers DGMPC-5, and Parker CPOM Series pilot-operated check valves.