Valves can be categorized into the following types, based on their operating mechanism.
– Ball valve, for on/off control without pressure drop. Ideal for quick shut-off, since a 90° turn completely shuts-off, compared to multiple 360° turns for other manual valves.
– Butterfly valve, for on/off flow control in large diameter pipes.
– Choke valve, raises or lowers a solid cylinder placed around or inside a second cylinder with holes or slots. Used for high pressure drops found in oil and gas wellheads, not to be confused with engine choke valve.
– Diaphragm or Membrane valve, controls flow by movement of a diaphragm. Used in pharmaceutical applications.
– Gate valve, mainly for on/off control, with low pressure drop.
– Globe valve, good for regulating flow. Uses a cylinder movement over a seat.
– Knife valve, similar to a gate valve, but usually more compact. Often used for scurries or powders on/off control.
– Needle valve for accurate flow control.
– Pinch valve, for slurry flow regulation and control.
– Piston valve, for regulating fluids that carry solids in suspension.
– Plug valve, slim valve for on/off control but with some pressure drop.
– Solenoid valve, an electrically actuated valve for hydraulic or pneumatic fluid control
– Spool Valve, for hydraulic control, similar to the choke valve.
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