Butterfly valves control flow through a circular disc or vane by turning the valve's pivot axis at right angles to the direction of flow in the pipe. They are normally used as throttling valves to control flow.
In the late 1800’s, Watts Regulator Company, made its reputation by "Setting The Standard In Valve Technology." During those early days, Watts manufactured pressure reducing valves to regulate steam, and relief valves to ensure safe operation of water heaters and boilers.... (more)
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