Week 14 challenge
Objective
The objective of this project is 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:
- Cooling water, air, gases, fire protection, etc.
- Slurry and similar services
- Vacuum service
- High-pressure and high-temperature water and steam services
COMPONENTS OF BUTTERFLY VALVE
1. BODY - BUTTERFLY VALVE
Butterfly valves are usually fixed between two pipleines using flange couplings. Body of our Butterfly valve and GD&T applied to the same using Siemens NX CAD are shown below
2. SHAFT - BUTTERFLY VALVE
The disc/plate, lever and nut are assembled to this shaft.
3. DISC - BUTTERFLY VALVE
When valve is fully opened or closed the disc is rotated a quarter turn.Disc is mounted on shaft. When the valve is closed, the disc is turned so that it completely blocks off the passageway.When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid.
4. LEVER - BUTTERFLY VALVE
Lever is mounted at an end of shaft outside the body. Hand lever is usually used in small sized Butterfly valves. It is used to open or close the valve.
5. RETAINER - BUTTERFLY VALVE
Retainer is a kind of washer fixed on the body of butterfly valve.
6. NUT - BUTTERFLY VALVE
t is fixed at the top end of shaft to keep the lever and retainer on position relative to the body of butterfly valve.
