FLOWSPE HH49X type micro-resistance slow close check valve is applicable to clean water, sewage, seawater drainage pipeline to prevent of backflow and water hammer, achieving protecting the pipeline to run safely. HH49X type micro-resistance slow close check valve has many advantages, such like small volume, light weight, power saving, small fluid resistance, new structure design, good sealing, smooth open and close, wear-resisting, long service life, oil pressure or slow close is not effected by fluid.