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Section - I
A: Valves
By: Anton Dooley

A valve is a mechanical device that regulates the flow of fluids (either gases, fluidised solids, slurries or liquids) by opening, closing, or partially obstructing various passageways.

Valves are used in a myriad of industrial, military, commercial, and residential applications.

There are many different types of valves:

Ball valve, which is good for on/off control;

Butterfly valve, particularly in large pipes;

Gate valve, mainly for on/off control;

Globe valve, which is good for regulating flow;

Check valve or Non-return valve, allows the fluid to pass in one direction only;

A pressure relief valve or safety valve operates automatically at a set differential pressure to correct a potentially dangerous situation, typically over-pressure.

High purity valves, are flow control devices that meet the industry criteria or purity of materials and design.

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