A swing check valve uses a hinged disc that swings open with forward flow. When flow stops, the disc of a swing check valve falls closed by gravity. This type of swing check valve is ideal for horizontal or vertical-up piping.
The body of a swing check valve is often made from cast iron, bronze, or stainless steel. A lever and weight on a swing check valve can assist closing in low‑pressure systems. The seat of a swing check valve is replaceable on larger sizes.
For water treatment plants, a swing check valve protects pumps from reverse rotation. A silent swing check valve has a spring‑assisted disc to reduce slamming. The face‑to‑face dimension of a swing check valve follows ANSI or API standards.
A 6‑inch swing check valve can handle flow velocities up to 15 feet per second. The disc travel of a swing check valve is limited by a stop pin. In wastewater applications, a swing check valve with a rubber seat seals against debris.
Installing a swing check valve too close to a pump may cause chattering. The hinge pin of a swing check valve should be horizontal for proper operation. Some swing check valve designs allow external adjustment of the closing speed.
A flanged swing check valve is common for large diameter pipes. For food service, a swing check valve with a sanitary clamp connection is used. Regular inspection of a swing check valve ensures the disc swings freely. A stuck swing check valve can cause serious system damage.
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