Wafer type butterfly control valve are used for isolating and regulating flow. The closing mechanism is a disc that allows for quick shut off, much like a ball valve. Wafer type butterfly control valve are light in weight so they require less support. Unlike the ball valve, the disc is always present within the flow, therefore a pressure drop is always induced during flow, regardless of valve position. The disc is typically rotated a quarter turn when the valve is fully opened, but the valve may also be opened incrementally in order to throttle flow.
Wafer type butterfly control valve consist of a disk which forms a seal against an elastomer or metallic seal. The disc rotates inside the body thereby restricting or allowing the flow. Wafer type butterfly control valves are very versatile. It can be used for manual or process control, throttling on/off of liquids or gases. They are often used because of their shot take-outs and lower costs.
Wafer type butterfly control valve turn 1/4-turn at a time. Lever operators are often equipped with a squeeze handle that disengages a pin from a round rack of teeth.The pin can be used to set the position of of disk inside and create a desired throttle. The valve can also be locked in position with thumb screw. This makes them ideal for use on mud pumps used in O&G rigs.
2.Disk and Stem Design - Wafer Type Butterfly Control Valve
Key component of a Wafer type butterfly control valve disk and stem. They are separate pieces in Wafer type butterfly control valve. Disk is machines to mate with the stem. Disk can be secured to stem in one of the two ways. In one design, the disk is bored and attached to stem with bolt or pins. The 2nd butterfly valve design uses disk that is bored first and stem is matched float inside the disk. The self centering of disk is advantageous when disk is covered or clad for use in corrosive application.
Wafer type butterfly control valve fit between two flanges, with studs passing from one flange through other. The valve is held in place and sealed with gasket by the tension of suds.
3.Applications of Wafer Type Butterfly Control Valve
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