A valve is a device that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways.
The simplest structure of valve and its components are shown in diagram
Valves may also be classified by how they are actuated:
- Hydraulic
- Pneumatic
- Manual
- Solenoid
- Motor
Regular examples of Valves are follows:
1. Ball Valve
2. Gate valve
3. Check valve (NRV)
4. Butterfly Valve
5. Globe Valve
6. Knife Gate Valve
7. Needle Valve
8. Foot Valve
9. Diaphragm Valve
10. Solenoid Valve
The Symbol for valves used in line diagram are as follows
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