8.9. Engineering and material for control valves
This engineering and materials section covers the minimum requirements for control valve bodies, actuators and accessories, designed, constructed and materially tested in accordance with the References outlined herein.
The following description is primarily intended to indicate the general and minimum requirement of the control valves body design criteria, to be used in oil and gas Industries. Control valves have inherent operation characteristics that hinder precise positioning under varying operating conditions. Factors such as pressure differential across the valve seat, over tightening of packing, and viscous or fouling service can create additional forces preventing the valve from assuming the ...
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