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Title: Pilot Operated Relief Valves In Natural Gas Service
Author: R. P. Wistner
Source: 1967 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1967
Abstract: A piloted operated valve cannot be discussed thoroughly without first discussing the direct acting spring loaded relief. The direct acting spring loaded valve is used as a relief pilot on all piloted operated relief valves. The relief pilot as a rule does not have all of the features as shown in Figure 1. The items of interest to be pointed out in the spring loaded relief valve in Figure 1 are: Item 5, feather or seal disc Item 2 , seat bushing or seat Item 3, adjusting ring and Item 4, ring pin. The seat disc and seat bushing, cr seat, form the valve shut-off system. It is the force created by the fluid pressure acting on the area of the seat disc that opens the valve. This force has to exceed the force created by the spring (Item 13) in order to open the valve.

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