4CT03A21

The 4CT03A21 check valve belongs to the Check Valves series and is manufactured by Vickers for hydraulic automation systems that require reliable directional control. The unit tolerates a maximum operating pressure of 210 bar (3000 psi) so it can be placed in high-pressure supply lines. A cracking pressure of 2 bar (30 psi) sets the point at which flow begins, preventing unwanted leakage at low differential pressures. The pilot area ratio of 3.11:1 reduces the force needed to shift the poppet when the valve is used in pilot-operated circuits. A 3/8 NPTF port thread accepts common pipe fittings, while a .5625-18 UNF-2B pilot port thread connects to external pilot lines. A .4375-20 UNF gauge port thread is provided so technicians can attach pressure instruments during commissioning or maintenance.

The valve body measures 70.9 mm in length, 122.2 mm in height, and 59.4 mm in width, allowing it to fit compactly within manifold blocks or line installations. Two 35 mm wrench flats are machined into the housing to give a secure grip for torque application during installation. An F3 seal package supports both mineral and fire-resistant fluids, extending usage across standard and safety-critical hydraulic media. The specified cleanliness code of ISO 18/15 identifies the maximum particulate level that the system fluid must meet to prevent premature wear of internal sealing surfaces. These dimensional and material characteristics complement the pressure and threading data stated earlier and define the valve’s suitability for space-constrained, high-duty hydraulic circuits.