Butterfly Valves

Valves [Lesson 4]


4. Butterfly Valves

Purpose: Butterfly valves are used for controlling flow and can act as a shutuoff ~va1ve, if the sealing arrangement is designed accordinglyThe disc or wafer rotates about a vertical axis and can be turned through 90º.

The disc seals against the opening to cut off flow and can be positioned at a point between fully closed and fully open as required.

Some butterfly valves have a direct acting lever, others are operated through gearboxes when finer control is required. In most cases, a clockwise movement will close the valve