Swing Check Valve Ductile Iron Flanged End Non Return Valve For Fire Fighting Water Pipeline

Adopting an innovative rocker pivot linkage design, the valve flap opens and closes automatically driven by fluid pressure. During forward flow, the flap fully opens and fits closely to the valve cavity wall, forming a straight flow channel to minimize flow resistance. Once the water flow stops or reverses, the flap closes instantly relying on its own weight and backflow pressure. All moving parts are fully enclosed without exposed transmission structures, effectively preventing external leakage. It operates stably in long-term continuous water supply conditions and avoids common failures like jamming and unresponsive switching.