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Title: Flexible Element Regulators
Author: REESE M. DAWES
Source: 2019 Western Gas Measurement Short Course
Year Published: 2019
Abstract: Flexible Element Regulators, also referred to as Unloading Design Regulators, utilize a rubber element that functions as both the actuator and valve of a self contained pressure regulator. This is in contrast to the more traditional style of regulators where a separate actuator, throttling valve and seat are used to regulate the pressure and provide shutoff. Traditionally in pressure control applications utilizing self-contained regulators, the restricting element of the regulator is a valve plug with an elastomer seat on the surface, which presses against a knife-edge orifice. The valve plugs function is to open and close in the flow stream when the flow demand fluctuates, and provide tight shutoff against the seat when no flow is required. This valve plug is coupled to a separate actuator component, which is actuated using pressure, and moves the valve plug to regulate and shutoff the flow stream (see Figure 1).

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