The valve, abbreviated as V, is a mechanism used to stop or open and regulate flow.  The type of valve used depends on the application.  In general, there are valves used for on-off (open-closed) applications, and throttling valves which can adjust flow.  All valves fall into two basic types: stop valves and check valves.

  • Stop Valves - Stop valves are used to shut off or partially shut off the flow of liquids.  Stop valves are divided into four basic types of valves: gate, globe, ball and butterfly.
  • Check Valves - Check valves are used to allow the flow of fluids in only one direction.  There are four basic types: diaphragm check, lift check, swing check, and tilting-disk check.
  • Valve Turns
    • Multi-turn Valves or Linear Motion Valves: Gate Valve, Globe Valve, Pinch Valve, Diaphragm Valve, Needle Valve
    • Quarter Turn Valve or Rotary Valve: Plug Valve, Ball Valve, Butterfly Valve
    • Self-activated Valves: Check Valve, Pressure Relief Valve

Types of valves

  • Ball Valve
    • Full Port Ball Valve, Reduced Port Ball Valve, Standard Port Ball Valve, Three-way Port Ball Valve, Trunnion Ball Valve
  • Butterfly Valve
    • Flange Style Butterfly Valve, Lug Style Butterfly Valve, Wafer Style Butterfly Valve
  • Check Valve
  • Control Valve
    • Back Pressure Valve, Choke Valve, Flow Control Valve, Level Control Valve, Pressure Control Valve, Temperature Control Valve
  • Diaphragm Valve
  • Gate Valve
    • Flap Gate Valve, Knife Gate Valve, Slide Gate Valve, Wedge Gate Valve
  • Globe Valve
    • Angle Globe Valve, Cross Globe Valve, Straight Globe Valve
  • Needle Valve
  • Pig Valve
  • Pinch Valve
  • Plug Valve
    • Conical Plug Valve, Cylindrical Plug Valve, Lift Plug Valve, Multi Port Plug Valve
  • Pressure Relief Valve
  • Specialty Valve

Valve Standards

ASME Standards

  • ASME B16.10 - Face to Face and End to End Dimensions of Valves
  • ASME B16.34 - Valves Flanged, Threaded and Welding End

ISO Standards

  • ISO 15848-1 - Industrial valves -- Measurement, test and qualification procedures for fugitive emissions -- Part 1: Classification system and qualification procedures for type testing of valves
  • ISO 15848-2 - Industrial valves -- Measurement, test and qualification procedures for fugitive emissions -- Part 2: Production acceptance test of valves

MSS Standards

  • MSS SP-6 - Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings
  • MSS SP-25 - Standard Marking Systems for Valves, Fittings, Flanges and Unions
  • MSS SP-88 - Diaphragm Type Valves

Valve Datasheets

Valve TypeDatasheets
Valves All Valves, ANSI (in)
Ball Ball Valve, ANSI (in)
Butterfly Butterfly Valve, ANSI (in)
Check Check Valve, ANSI (in)
Gate Gate Valve, ANSI (in)
Globe Globe Valve, ANSI (in)
Plug Plug Valve, ANSI (in)

Valve Associations

Valve Drawings

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Valve Related Articles


Display #
Back Pressure Valve
Ball Check Valve
Ball Valve
Barstock Valve
Bellows Sealed Valve
Butterfly Valve
Check Valve
Check Valve Standards
Choke Valve
Crack a Valve
Extended Bonnet
Extended Outlet
Gate Valve
General Valve Standards
Glade Flange
Globe Valve
Lift Check Valve
Limit Stop
Limit Switch
Lock Closed
Lock Open
Normally Closed
Normally Open
Packing Box
Plug Valve
Pressure Safety Valve
Regulating Valve
Seat Ring
Set Pressure
Spring Button
Stop Check Valve
Superimposed Backpressure
Swing Check Valve
Tilting Disk Check Valve
Valve Body
Valve Installation Guide
Valve Selection Guide
Valve Service Guide
Valve Sizing for Gas and Steam
Valve Sizing for Liquid
Volume Booster

Tags: Equations for Valves