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Control Valve>Types and Application

GENERAL
If the application allows, valves with a rotating spindle are preferred to linear motion valves for reasons of :- robustness- capacity, turndown- fugitive, emissions.

Control valves and pressure regulators shall be selected in accordance with the requirements of the piping class. Cadmium plating or galvanising shall not be used for any component of the control valve
assembly or its accessories. In applications/locations where freezing may occur, valve stems, solenoid valves and other mechanical moving parts shall be protected against ice formation. The Principal shall
approve the method of protection. Linear motion valves shall be installed with their actuator stem in the vertical position.
Control valves shall be installed with sufficient clearance around the actuator and valve body to allow the control valve to be dismantled without the valve body being removed from the pipe. There shall be sufficient clearance to lift and remove the valve. Control valves shall be located so that they are accessible for hoisting equipment where needed.

Throttling control valves should not be used if tight shut-off Class V or VI is required as per IEC 60534-4, since these shut-off classes cannot be maintained over a prolonged period. If a Class V or VI shut-off is required, a dedicated on-off TSO valve (e.g. ball or high performance butterfly valve) should be installed in series with the throttling control valve.

NOTE: Some Manufacturers report good results for metal-seated rotary valves in throttling service, where TSO class V could be maintained over a prolonged period. Such valve designs may be considered for valves without IPF function. The necessity of assigning such shut-off classes shall be examined with care. For shut-off class VI, rotary valves are preferred. For depressuring services, two valves in series shall not be employed.

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