CPC G05D 16/163 (2013.01) [F16K 17/10 (2013.01); G05D 16/024 (2019.01); G05D 16/16 (2013.01); F16K 1/523 (2013.01); F16K 1/526 (2013.01); F16K 17/02 (2013.01); F16K 31/126 (2013.01); Y10T 137/7795 (2015.04); Y10T 137/7796 (2015.04)] | 18 Claims |
1. A control system, comprising:
a first pressure regulator comprising a fluid inlet, a fluid outlet, and an actuator assembly, the actuator assembly comprising a cavity and a diaphragm assembly disposed within the cavity and dividing the cavity into a first chamber and a second chamber;
a downstream fluid control device comprising a second fluid inlet in fluid communication with the fluid outlet of the first pressure regulator and a second fluid outlet in fluid communication with the first chamber of the first pressure regulator;
a first pilot in direct fluid communication with the second chamber of the actuator assembly and the fluid inlet, the first pilot having a first setpoint;
a second pilot in direct fluid communication with the second chamber of the actuator assembly, the fluid inlet, and the second fluid outlet, the second pilot having a second setpoint, less than the first setpoint;
wherein the first pilot and the second pilot are configured to:
fluidly couple the second chamber to the second fluid outlet with the control system in a first mode of operation;
isolate the second chamber from the second fluid outlet and the fluid inlet with the control system in a second mode of operation; and
fluidly couple the second chamber to the fluid inlet with the control system in a third mode of operation.
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