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DESIGN OF BUTTERFLY VALVE AIM: To model a butterfly valve…
Kevin Christopher
updated on 07 Feb 2023
DESIGN OF BUTTERFLY VALVE
AIM:
To model a butterfly valve and apply GD&T to the different parts and assembly of the butterfly valve.
Introduction:
A Butterfly valve is a quarter-turn rotational motion valve, that is used to stop, regulate, and start a flow. Butterfly valves are easy and fast to open. A 90° rotation of the handle provides a complete closure or opening of the valve. Large Butterfly valves are usually equipped with a so-called gearbox, where the handwheel by gears is connected to the stem. This simplifies the operation of the valve, but at the expense of speed.
Applications of Butterfly Valves:
A Butterfly valve can be used in many different fluid services and they perform well in slurry applications. The following are some typical applications of Butterfly valves:
Advantages of Butterfly Valves:
Disadvantages of Butterfly Valves:
Components of Butterfly Valve:
Butterfly valves generally have bodies that fit between two pipe flanges. The most common body designs are lug and wafer.
The stem of the butterfly valve may be a one-piece shaft or a two-piece (split-stem) design.
The retainer is a specially shaped washer that fits over the top of the valve spring. The keepers, or locks, fit into the valve stem grooves, holding the retainer and spring in place.
The flow closure member of a butterfly valve is the disk. The disk is the equivalent of a plug in a plug valve, gate in a gate valve or a ball in a ball valve. Rotating the disk one-quarter turn or 90 Degrees opens and closes the butterfly valve.
The hand lever is commonly used for small butterfly valves and is used to open and closed the valve. It is capable of being locked into a position of open, partially open, or closed.
Nuts are almost always used in conjunction with a mating bolt to fasten multiple parts together. The two partners are kept together by a combination of their threads' friction.
Assembly:
After modeling all the individual parts of the butterfly valve, all parts are assembled together in the assembly workbench of NX.
Conclusion:
The Butterfly valve is successfully created and GD&T is applied to all the different parts and the assembly of the Butterfly valve.
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