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- Third Assistant Engineer (Steam-Motor-Gas Turbine Plants (Unlimited)) »
- Q535 - General Subjects
875. Suppose the pilot controller for the illustrated pneumatically operated diaphragm actuated control valve is supplied with 20 psig control air and is designed to operate the valve with a pilot pressure ranging from 3 to 15 psig. What would be the indication of a properly adjusted spring (6) by means of the adjusting nut (12)
The actuator, designed to operate within a 3-15 psig range, requires a spring adjustment that positions the valve fully open at 3 psig and fully closed at 15 psig, reflecting its air-to-close functionality.
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