Female threaded check valve is to rely on the flow of the medium itself and automatically open and close the valve flap, used to prevent the medium backflow valve, also known as check valve, check valve, backflow valve, and back pressure valve. Female threaded check valve only allows the medium to flow in one direction, and prevent the direction of flow. Usually this valve is automatic, in a direction of flow of fluid pressure, valve open; fluid flow in the opposite direction, by the fluid pressure and the valve flap of the self-weighting valve flap action on the valve seat, thus cutting off the flow.

Internal thread check valve due to the pipeline inlet end of the media pressure role, and overcome the spring resistance to make the valve open or close; when the inlet end of the media pressure is lower than the outlet end, the spring will be pushed to the spool valve seat and make the valve closed to prevent the media backflow, so the role of check. Vertical check valve used in chemical, liquefied petroleum gas, fluid and other industries. Beautiful appearance, small shape, with spring device, vertical and horizontal installation can be.

Internal thread check valve is characterized by high precision, beautiful appearance, small shape, with spring device, vertical and horizontal installation. Check valves are mainly used in pipeline systems to prevent backflow of media. Silicone precision casting stainless steel body, reasonable structure, beautiful shape check valve can be divided into rotary check valve (rotating according to the center of gravity) and lift check valve (moving along the axis). These valves should be installed horizontally in the pipeline.