20mm Piston-Type Check Valve without Flanges, Type HCK1

These heavy-duty, piston-type check valves control the flow of refrigerant. Valves open wide for flow in the direction of the arrow on the valve body. Valves close tight when flow reversals occur. The piston design minimizes pulsations. Valves open when inlet pressure exceeds outlet pressure (1 psid [.07 bar] minimum), thereby lifting the piston/seat assembly and allowing flow through the valve. When inlet pressure and outlet pressure are equalized, the weight of the piston/seat assembly causes the valve to close.

If outlet pressure exceeds inlet pressure, the outlet pressure acting on top of the piston/seat also helps seat the valve closed. The HCK1 piston-type check valve prevents reverse flow of refrigerant in liquid, discharge, suction, and hot gas lines. It is an ideal valve where constant pulsating of gas or liquid is present, or where a manual opening of the valve is desirable. This valve is suitable for ammonia, R22, R134a, CO2 and other common refrigerants.

The piston-type check valve is available in sizes from 20mm to 100mm without flanges. Sizes 125mm and 150mm are also able to be purchased but only come in a weld-in connection style.

If flanges are required, they must be purchased separately.