Week 14 challenge

ASSEMBLING THE BUTTERFLY VALVE COMPONENTS AND APPLYING GD@T TO THE ASSEMBLY DRAWING

AIM:

TO ASSEMBLING THE BUTTERFLY VALVE COMPONENTS AND APPLYING GD@T TO THE ASSEMBLY DRAWING BY USING NX CAD SOFTWARE.

INTRODUCTION:

BUTTERFLY VALVE:

A Butterfly valve is a quarter-turn rotational motion valve, that is used to stop, regulate, and start 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.

Basic components:

The butterfly valve consists of main components: body, disc plate,shaft/ stem,lever,retainer,and nut.

1.BODY: Butterfly valves generally have bodies that fit between two pipe flanges, the most common being lug and wafer body design.

MODEL OF BODY:

2.SHAFT/STEAM: The stem of the butterfly valve may be a one-piece shaft or a two-piece (split-stem) design. The stem in most resilient seated designs is protected from the media, thus allowing an efficient selection of material with respect to cost and mechanical properties.

MODEL OF SHAFT:

3.DISC PLATE: The disk is how the valve stops flow – it is equivalent to a plug in a plug valve, a gate in a gate valve or a ball in a ball valve. There are variations in disk design and orientation in order to improve flow, sealing and/or operating torque.

MODEL OF DISC PLATE:

4.RETAINER PLATE:

The seat of a resilient-seat butterfly valve utilises an interference fit between the disk edge and the seat to provide shutoff. The material of the seat can be made from many different elastomers or polymers. The seat may be bonded to the body or it may be pressed or locked in.

MODEL OF RETAINER:

5.LEVER:

Lever's are normally used to open and close the butterfly valve,Easy to use lever handle can be adjusted to multiple positions, moving the disk inside. Available now in various sizes.Large Butterfly Valves are usually comprised of a gearbox, where the hand wheel by gears is joined to the stem. This gives ease to the operation of the Butterfly Valve, but at the expense of speed.

MODEL OF LEVER:

6.NUT:

A nut is a type of fastner with a threaded hole. 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, a slight strectching of the bolt, and comparession of the parts to be held together.

MODEL OF NUT:

ASSEMBLY OF BUTTERFLY VALVE:

After creation of the each and every parts of the butterfly valve,assemble the all parts togather by the usage of assembly constrains in nx assembly section.

COMMANDS USED:

Some of the assembly constraints are used to assemble the butterfly valve are,

*INFER CENTER AXIS

*TOUCH

*ALIGN

*MOVE

*ROTATE

ASSEMBLED MODEL:

Butterfly Valve Applications

• A Butterfly valve is used in many different fluid services and they perform well in slurry applications also. They can be used in liquids, steam, cryogenics, cooling water, air, gasses, firefighting & Vacuum services.
• Butterfly Valve is used in all type of industries application even in High-pressure and temperature services.

Butterfly Valve Advantages

• Butterfly Valve is suitable for large valve applications due to Compact, lightweight design that requires considerably less space, as compared to other valves
• Due to a quick operation, it needs less time to open or close
• The maintenance costs are usually low compared to other valve types
• A pressure drop across a butterfly valve is small
• Valve with Non-metallic seating can be used in chemical or corrosive media.

Butterfly Valve Disadvantages

• Throttling is limited to low differential pressure services and that too with a 30- to 80-degree disc opening.

There is a chance for cavitation and choke as the disk is always in the flow Turbulence flow can affect the disc movement.

CONCLUSION:

THE BUTTERFLY VALVE AND THE GD&T OF THE ASSEMBLED BUTTERFLY VALVE DRAWING IS CREATED SUCCESSFULLY BY USING NX CAD SOFTWARE.