A valve is a mechanical device whose function is to control the flow of fluids in piping systems.
The fluids controlled in industrial settings can be the common liquids, gases, and vapors; but they also can be liquids carrying suspended solid particles (called slurries) and gases carrying suspended solid particles.
The control applied to these fluids can take one or more of the following forms:
- Starting and stopping flow— (Gate, Ball, Butterfly, Diaphragm)
- Regulating flow volume (frequently called throttling)— (Globe, Butterfly, Diaphragm)
- Preventing reverse flow (called anti-backflow)---- (Check)
- Changing flow direction— (Multi Pod Plug, Multi Port Ball)
- Limiting fluid pressure— (Safe & Relief)
A valve performs its control function by placing an obstruction (hereafter called the flow control element) in the fluid path through the valve.
The nature of the flow control element determines the valve type and the form of control for which the valve is suited.
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