Butterfly Valve Working Principle. Resilient-seated butterfly valves are the most basic design and are also commonly called concentric or resilient-seated butterfly valves.In this type of valve, the stem is centered in the middle of the valve disc, which is centered in the pipe bore. Industry News. The main components of a butterfly valve are the body, seal, disc and stem (Figure 2). The disc remains parallel or perpendicular to the flow. Butterfly valves have a relatively simple construction. A pressure drop is introduced by the disc upon the flow even when open. Ball Valve vs Butterfly Valve; Principle of Operation. The basic working principle of pneumatic valve is that compressed air enters the pneumatic actuator to drive the piston, and then rotating or lifting torsion shaft drives the stem. If it is used to control the flow, the flow characteristic is also closely related to the flow resistance of the pipes. It is based on the quick shut off principle. In the cylindrical passage of the valve body, the disc is rotated around the axis to control the flow rate. The disc of the valve is placed in the center of the pipe which allows a rod to go through it to an actuator, on the outer side of the valve. Again the orientation of the butterfly … The sealing principle of single eccentric sealing butterfly valve. Butterfly valve opening and flow between basically a linear proportional change. VALVES Common Types • Butterfly Valves Butterfly valves use a similar principle to ball valves. This valve typically has a rubber (or resilient) seat and relies on the disc having a high level of contact with the seat to effect a seal. Jan 12,2019 Posted by Bundor. The sealing structure of the series of butterfly valves produced are: single eccentric seal, double eccentric seal, triple eccentric seal, variable eccentric seal, and the sealing principles of various structural types of butterfly valves are briefly described as follows:. The butterfly plate of the electric butterfly valve is installed in the diameter direction of the pipeline. Working Principle of Butterfly Valve. 1. The butterfly valve is a valve that uses a disc-type opening and closing member to revolve around 90 ° to open, close, or adjust the medium flow. Posted: 05/26/2020 01:05:18 Hits: 10. However, instead of a ball mounted in the valve body a circular disc (called a butterfly because the two half circles around the vertical shaft appear like wings). Butterfly valve is a kind of valve that is opened and closed according to the rotation of the valve stem to drive the disc to rotate. Air Actuated Butterfly Valve is composed of pneumatic actuator and butterfly valve. Working Principle of Butterfly valve. 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