Duo-Chek® valves have long been the standard for low-pressure drop flow reversal protection. These valves are made from cast iron, cast steel, stainless steel, and a broad variety of exotic materials.

Duo-Chek offers retainerless designs to API 594 end-to-end dimensions in steel bodied wafer and lug style with a wide variety of trim materials including both metal and resilient seats. Valves come in sizes up to 88" and pressure ratings up to class 4500.

Duo-Chek® High Performance Non-Slam Check Valves Duo-Chek® high performance non-slam check valves are the original Mission wafer check valves introduced to the market in the late 50's