How a Valve Works?

Flow control Valve ------- 4 Methods By which it works

As a student of mechanical engineering, plant engineers, plant technician, maintenance technician or plant operator you might be interested in knowing how flow is controlled in these valves.

In general, there are four methods of controlling flow through a valve.

  1. Move a disc, or plug into or against an orifice (for example, globe or needle type valve).
  2. Slide a flat, cylindrical, or spherical surface across an orifice (for example, gate and plug valves).
  3. Rotate a disc or ellipse about a shaft extending across the diameter of an orifice (for example, a butterfly or ball valve).
  4. Move a flexible material into the flow passage (for example, diaphragm and pinch valves).