Plastic Butterfly Valves
Plastic butterfly valves are flow control mechanisms that are used to regulate the flow of liquids. They are plastic discs that seal pipes by turning ninety degrees on an axis. Butterfly valves are rotary valves, meaning they rotate a quarter turn between the open and closed positions.
Operators of plastic butterfly valves can control the flow of a fluid or gas by pulling a lever that opens or closes the valve. In the open position, the round disc sits perpendicular to the seal around the pipe. When the lever is pulled or rotated, however, the disc rotates around so that it fits snugly into the seal and blocks all flow. In other words, the disc has two positions, either parallel or perpendicular to the flow of water.
The body and disc of plastic butterfly valves are made of thermoplastic materials. Plastic butterfly valves can be molded into a strong, one-piece design. Butterfly valves are an efficient and reasonably inexpensive type of flow control device. They are used in water distribution, chemical services, and ventilation applications.