1. WORKSHOP PRACTICE
SAFETY VALVE

2. WHAT IS VALVE?
A valve is a device that regulates the flow of a fluid (gases, fluidized solid, slurries, or liquids) by opening, closing, or partially obstructing various passageways.

3. Where it can be used?
industrial, military, commercial, residential, and transportation. Oil and gas, power generation, mining, water recirculation, sewerage and chemical manufacturing are the industries in which the majority of valves are used.

4. How does it operate?
It can be operated manually, either by a hand wheel, lever or pedal. It may also be automatic, driven by changes in pressure, temperature or flow. It can be classified either: Manual Solenoid Hydraulic/Pneumatic
These changes may act upon a diaphragm or a piston which in turn activates the valve, examples of this type of valve found commonly are safety valves fitted to hot water systems or steam boilers.

5. How to installed? Safety codes
Pressure and temperature must never exceed the limit
Proper place
Proper type of seal/gasket
Proper flanged alignment

6. Types of valve

7. Types of valve Gate Valve Poppet Valve Plug Valve Globe Valve
Check Valve
Butterfly Valve
Diaphragm Valve
Ball Valve
Needle Valve
Pinch Valve

8. Gate Valve

9. poppet Valve

10. Plug Valve

11. Globe Valve

12. Check Valve

18. Valve parts

19. Valve parts Body and Bonnet Ports Disc Seat/seal Stem Bonnet Spring
Handle
Gland Follower
Gasket

20. Body and Bonnet
Bonnet is the part of a valve casing through which the stem passes and that forms a guide and seal for the stem. It hold the fluid going through the valve. Valve bodies are usually metallic. Brass, bronze, gunmetal, cast iron, steel, alloy steels and stainless steel are very common. Plastic bodies are used for relatively low pressures and temperatures. PVC, PP, PVDF and glass-reinforced nylon are common plastics used for valve bodies.
The main part of the valve consists of the valve body and bonnet.

21. Ports
To allow the fluids in and out of the valve. These ports are obstructed or opened up by the valve member or disc to control the fluid flow.

22. Disc
Inside the valve body, flow through the valve may be partly or fully blocked by an object called a disc.
It comes in various shapes. Although the valve body remains stationary within the fluid system, the disc in the valve is movable so it can control flow.

23. Seat
The valve seat is the interior surface in the body which contacts or could contact the disc to form a seal which should be leak-tight when the valve is shut.
Seats can be integral to the valve body, that is "hard" metal or plastic. Nearly all metal seated valves leak, even though some leaks are extremely small.
Gate Valves, Globe Valves, Check Valves are usually hard seated Valves and Butterfly Valves, Ball Valves, Plug Valves, Diaphragm Valves are Usually soft seated Valves

24. Stem
The stem is a rod or similar piece spanning the inside and the outside of the valve. It is to control the internal disc or rotor from outside the valve.

25. Many valves do not have bonnets ex. plug valves
A bonnet acts as a cover on the valve body. It is commonly semi-permanently screwed into the valve body.
The bonnet is attached to hold everything together inside. To access internal parts of a valve
Many valves do not have bonnets ex. plug valves

26. Spring
Many valves have a spring for spring-loading, to normally shift the disc into some position by default but allow control to reposition the disc.

27. It is to open and closed the valve and to control the flow of fluids.
HAndle
It is to open and closed the valve and to control the flow of fluids.

28. It is to prevent any leakage of fluid while allowing the stem to move.
gland FolLower
It is to prevent any leakage of fluid while allowing the stem to move.

29. To prevent leakage of fluids from the moving parts.
gasket
To prevent leakage of fluids from the moving parts.

30. Valve operating positions

31. Valve operating positions
One-port valves
Two-port valves
Three-port valves
Four-port valves

32. Not allow to direct a fluid or gas in a specific pipe.
ONE PORT VALVE
It can only allow the fluid or gas to move along the pipe or they can stop it from moving. Depending on the valve chosen, the speed on which this is done may too be changed.
Not allow to direct a fluid or gas in a specific pipe.

33. TWO PORT VALVES
2-way valves are made in which the flow can go in either direction between the two ports, when a valve is placed into a certain application, flow is often expected to go from one certain port on the upstream side of the valve, to the other port on the downstream side.

34. 3-way valves are ball or rotor valves
THREE PORT VALVES
The flow coming in at one port can be directed to either the second port in one position or the third port in another position or in an intermediate position so all flow is stopped.
3-way valves are ball or rotor valves

35. FOUR PORT VALVES
It has four ports equally spaced round the valve chamber and the plug has two passages to connect adjacent ports. It is operated with two positions.
It can be used to isolate and to simultaneously bypass a sampling cylinder installed on a pressurized water line.
It is useful to take a fluid sample without affecting the pressure of a hydraulic system and to avoid degassing
Degassing – removed gas solid n liquid from the vaccum

36. THE END THANK YOU FOR YOUR ATTENTIONED