Fluid control valves are classified in many ways. Following is the classification of valves.
Multi Turn and Quarter Turn Valves
Multi turn valves need many turns of actuator to bring closure member (disc) from fully open position to fully closed position. Examples of multi turn valves are gate valves, globe valves, needle valves, and diaphragm and pinch valves.
While quarter turn valves need only quarter ,0 to 900 degree, motion of closure member (disc) to bring it from full open position to full closed position. Examples of quarter turn valves are butterfly valves, ball vales and plug valves etc. Quarter turn vales are quickopening valves.
Self actuated Valves
Self actuated valves don’t need actuator to operate them. These valves operate based on some property of fluid line like pressure or flow. Self actuated valves don’t need operator’s interference to control the fluid. Examples of self actuated valves are check valves and pressure relief valves or safety valves.
Linear Motion and Rotary Motion Valves
In linear motion valves, disc moves in linear or straight path to open, close or throttle the flow in valve. While in Rotary motion valves, disc rotates to open, close or throttle the flow. Examples of linear motion valves are gate valves, needle valves, globe valves, diaphragm valves and pinch valves. Examples of Rotary motion valves are ball valves, butterfly valves etc.
General Types of valves
In general following are the types of valves.
• Gate valve
• Globe Valve
• Pinch Valve
• Needle valve
• Diaphragm valve
• Ball valve
• Butterfly Valve
• Check valve
• Pressure relief Valve (safety or relief valve)
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