If it is necessary to increase the operating head pressure of the refrigeration system using the device shown in the illustration, what should be done? GS-RA-14

Illustration GS-RA-14: the U.S. Coast Guard has not released this illustration.

Question

If it is necessary to increase the operating head pressure of the refrigeration system using the device shown in the illustration, what should be done? GS-RA-14

Illustration GS-RA-14: the U.S. Coast Guard has not released this illustration.

Accepted Answer

Option C: "2" should be turned to further compress the spring. Compressing the internal spring of a head pressure regulating valve by turning adjusting screw "2" increases the mechanical force holding the valve closed. This forces the system to build higher upstream discharge pressure before the valve opens to the condenser.