CREATING BUTTERFLY VALVE & DRAFTING WITH GD & T
- A butterfly valve is from a family of valves called quarter-turn valves.
- In operation, the valve is fully open or closed when the disc is rotated a quarter turn.
- The "butterfly" is a metal disc mounted on a rod.
- When the valve is closed, the disc is turned so that it completely blocks off the passageway.
BUTTERFLY PARTS :
- body
- retainer
- handle
- disc plate
- nut & screw
- shaft
COMPONENTS :
The butterfly valve consists of only four main components: body, disk, stem and seat.
Butterfly valve body:
Butterfly valves generally have bodies that fit between two pipe flanges, the most common being lug and wafer body design.
Butterfly valve disk:
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.
Butterfly valve Stem / SHAFT:
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.
APPLICATIONS OF BUTTERFLY VALVE:
Butterfly valves can be used across a wide range of applications. They perform well in large volume water applications and 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
- Compressed Air or Gas Applications.
DRAFTING WITH DETAILED Geometric dimensioning and tolerancing:
RETAINER: