■ It is used as return protection in pipelines. Heat exchanger in heating systems It is used to prevent condensate backflow and reverse heating as a result of stopping the system. The spring opening pressure in the disc type check valve is standard as 0.02 bar. The water flow is unidirectional. The reverse flow closes the damper, causing the flow in the opposite direction to be interrupted.

■ Energy production, Refineries, Petrochemical plants, Chemical industry, It is used in food plants and paper mills.