Essence: A one-way check valve designed specifically for the bottom of pump suction pipes to prevent liquid backflow and maintain the water filling state inside the pump.

Core functions:

Anti backflow: The valve disc (such as rubber disc, spring assisted metal disc) opens and closes unidirectionally to block the medium backflow during shutdown and prevent the pump body from idling;

Anti clogging: The bottom is often equipped with a filter screen structure to intercept impurities (such as sediment and debris), protect the pump body and pipelines;

Typical design:

Straight through/right angle, flange or threaded connection, mostly made of cast iron or stainless steel (corrosion-resistant);

Low flow resistance design reduces suction loss and is suitable for low viscosity media such as water and oil.

Application scenarios: Centrifugal pump suction inlet, farmland irrigation, ship ballast water system, chemical liquid transportation and other self-priming pump systems.