A butterfly check valve is a valve that automatically opens and closes the valve disc based on the flow of the medium itself, used to prevent backflow of the medium. The function of a wafer-type butterfly check valve is to allow the medium to flow in only one direction and prevent reverse flow. In the fully open condition of a swing check valve, fluid pressure is almost unimpeded, so the pressure drop across the valve is relatively small. The valve disc of a lift check valve is seated on the sealing surface of the valve seat in the valve body. Apart from the valve disc being free to lift, the rest of this valve is similar to a globe valve; fluid pressure lifts the valve disc from the valve seat sealing surface, and medium backflow causes the valve disc to fall back onto the valve seat, cutting off the flow. Depending on the operating conditions, the valve disc can be of all-metal construction or can have rubber gaskets or rings embedded in the valve disc frame. Like a globe valve, the passage through a lift check valve is also narrow, so the pressure drop across a lift check valve is greater than that across a swing check valve, and the flow rate of a swing check valve is subject to fewer restrictions.
- Small size, light weight, compact structure, and easy maintenance
- The valve plate adopts a dual design and can close rapidly under the elastic torque of the spring
- Due to the rapid closure, it can prevent medium backflow
- The valve body has a short structural length and good rigidity
- Safe and convenient, can be installed in both horizontal and vertical directions
Applications
Butterfly check valves are used in pure pipelines and in industrial, environmental protection, water treatment, and high-rise building water supply and drainage pipelines to prevent reverse flow of the medium.
