Isolation valves are used in a wide variety of different applications where on/off type control is required, these include:Ī multitude of different types and designs of isolation valve have been developed in order to meet this range of applications and the diverse operating conditions in which they are used. Control valve - A power-operated device which changes the fluid flowrate in a process control system.Regulating valve - A valve intended for use in any position between closed and fully open.Isolating valve - A valve intended for use only in the closed or fully open position.The European standard EN 736-1:1995 distinguishes between isolating, regulating and control valves as follows: ![]() ![]() They are also sometimes used to manually control the flow of the fluid. ![]() Isolation valves are a key component in any fluid system as they are used to stop the flow of fluid into a particular area of the system.
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