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Machine Drawing with AutoCAD by Goutam Ghosh, Goutam Pohit

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Chapter 13

Valves

Chapter Outline

A valve is a device to check or control the flow of fluid through a passage. Valves are essential components for any fluid power and control circuit. Though there are many variants, yet all valves are alike in concept despite the present-day trend for greater simplification, and standardisation.

Valves are operated by hand, by the pressure of the fluid they handle, or by some external mechanism. Valves that are operated by the pressure of a fluid are called non-return valves. The name itself suggests that they allow passage of fluid only in one direction just like a diode in an electrical circuit. Relief valves and safety valves also operate by ...

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