FLOWSPEC HH44X type micro-resistance slow close check valve is applicable to water supply and drainage pipeline, which is mounted on the pump outlet to prevent of backflow and water hammer, and it reduce effectively water hammer pressure when closing valve to protect the pipeline to run safely. HH44X type micro-resistance slow close check valve has many advantages, such like light disc, big open, power saving, small fluid resistance, new water hammer eliminator design, good sealing, wear-resisting, long service life, smooth operation, no vibration or noise