| 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)? Illustration GS-0051 |
| A) The valve should indicate fully open at 3 psig and should indicate fully closed at 15 psig. |
| B) The valve should indicate fully closed at 3 psig and should indicate fully open at 15 psig |
| C) The valve should indicate fully open at 0 psig and should indicate fully closed at 20 psig. |
| D) The valve should indicate fully closed at 0 psig and should indicate fully open at 20 psig. |
