초록 ▼

System and method for controlling process fluid flow to maintain a set delivery pressure at varying demand, including a fluid-loaded, self-operated main regulator and a method for providing the loading pressure therefor. The system also includes a flow restrictor for metering the loading fluid flow,

System and method for controlling process fluid flow to maintain a set delivery pressure at varying demand, including a fluid-loaded, self-operated main regulator and a method for providing the loading pressure therefor. The system also includes a flow restrictor for metering the loading fluid flow, a back-pressure regulator for controlling the loading fluid pressure, and a temperature-actuated regulator for venting loading fluid when the process fluid temperature varies from a selected range.

대표청구항 ▼

A system for controlling process fluid flow from a source conduit to a consumer conduit to maintain a set delivery pressure at varying demand, said system comprising: (a) a main regulator having: (1) an inlet port for connection to the source conduit; (2) an outlet port for connection to the consume

A system for controlling process fluid flow from a source conduit to a consumer conduit to maintain a set delivery pressure at varying demand, said system comprising: (a) a main regulator having: (1) an inlet port for connection to the source conduit; (2) an outlet port for connection to the consumer conduit; (3) an orifice communicating with said inlet port and said outlet port; (4) a loading port; (5) a plug adapted for positioning to vary the opening of said orifice; and (6) plug positioning means for positioning said plug in response to the difference in pressure of fluid in said outlet port and pressure of fluid in said loading port; (b) a flow restrictor an inlet and an outlet; (c) a control fluid conduit for connecting saidinlet of said flow restrictor to a source of control fluid; (d) a control fluid conduit connecting from said outlet of said flow restrictor to said loading port on said main regulator; (e) a back-pressure regulator having: (1) an outlet port open to a low pressure sink; (2) an inlet port; (3) a housed diaphragm adjustably loaded on one side by an adjustable spring and on the other side by communication with the fluid in said inlet port of said back-pressure regulator; and (4) a valve between said inlet port and said outlet port operated by said diaphragm; and (f) a control fluid conduit connecting said inlet port on said back-pressure regulator with said loading port on said main regulator.