Week 14 challenge

AIM:- Assemble and apply GD&T to the butterfly valve assembly drawing.

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

Various components of butterfly valve and GD&T applied to them are shown below.

• BODY - BUTTERFLY VALVE

Butterfly valves are usually fixed between two pipleines using flange couplings. Body of our Butterfly valve using Siemens NX CAD are shown below.

SHAFT - BUTTERFLY VALVE

The disc/plate, lever and nut are assembled to this shaft.

RETAINER - BUTTERFLY VALVE

Retainer is a kind of washer fixed on the body of butterfly valve

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.

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.

NUT - BUTTERFLY VALVE

It is fixed at the top end of shaft to keep the lever and retainer on position relative to the body of butterfly valve.

ASSEMBLY - BUTTERFLY VALVE

After completing the modelling of various components of butterfly valve, all parts were assembled together using Siemens NX Assembly workbench.