Silencer check valves are automatic valves that open and close the valve disc automatically by the medium's flow, used to prevent reverse flow of the medium. They are also known as non-return valves, one-way valves, silent check valves, reverse flow check valves, and back pressure valves. Check valves belong to a type of automatic valve, primarily used to prevent reverse flow of the medium, prevent pumps and driving motors from reversing, and release the contents of containers. Check valves can also be used on piping lines that supply auxiliary systems where the pressure may rise above the system pressure. Check valves can mainly be divided into swing check valves (rotating around the center of gravity) and lift check valves (moving along the axis).

The silencer-check valve is a valve that automatically opens and closes its disc due to the flow of the medium itself, used to prevent reverse flow of the medium and is also known as a non-return valve, one-way valve, silencer-check valve reverse flow valve, and back pressure valve. The check valve is a type of automatic valve, primarily used to prevent reverse flow of the medium, prevent pumps and driving motors from reversing, and to release the contents of containers. Check valves can also be used in piping lines that supply auxiliary systems where the pressure may rise above the system pressure. Check valves can be mainly divided into swing check valves (rotating around the center of gravity) and lift check valves (moving along the axis). Internal threaded check valves and butterfly check valves belong to this type of valve, which includes swing check valves and lift check valves. Swing check valves have a hinge mechanism and a valve disc that resembles a door, freely resting on the inclined surface of the valve seat. To ensure that the valve disc always reaches the appropriate position on the valve seat, the valve disc is designed with a hinge mechanism to provide sufficient swing space and to ensure a true, full contact with the valve seat. The valve disc can be made entirely of metal, or it can be inlaid with leather, rubber, or use synthetic coatings, depending on the performance requirements. In the fully open position, the swing check valve allows fluid pressure to flow almost unhindered, resulting in relatively low pressure drop across the valve. The lift check valve's valve disc seat is located on the valve body's sealing surface. This valve, in addition to the valve disc being able to rise and fall freely, operates similarly to a gate valve, where fluid pressure lifts the valve disc from the sealing surface, and the reverse flow of the medium causes the valve disc to fall back onto the seat, thus stopping the flow. Depending on the operating conditions, the valve disc can be a full metal structure or can be mounted with rubber pads or rings on the valve disc架. Like gate valves, the flow channel through a lift check valve is narrow, resulting in a higher pressure drop compared to a swing check valve, and the flow rate of the swing check valve is less restricted. Such valves should generally be installed horizontally in the piping.