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Title: FLEXIBLE ELEMENT REGULATORS
Author: Bryan Vranek
Source: 2022 Appalachian Gas Measurement Short Course
Year Published: 2022
Abstract: This class will consist of a presentation about flexible element style regulators. Flexible element regulators are offered in both a tube style as well as a flexible diaphragm style design. Both types of regulators are used in a pressure control system, which is a system that controls the flow of fluid from a supply to a load system while maintaining pressure. It is important to have these types of regulators to control pressure to allow for safety and efficiency. Below is an example of where pressure control devices will be used in a natural gas distribution system. The regulator itself is the device that controls the flow of gas from the higher pressure system to the lower pressure system while trying to maintain the constant delivery pressure needed. These types of regulators can operate as either a pressuring reducing regulator (taking a pressure cut) or a back pressure regulator (holding upstream pressure back). The principle of operation of both types is very similar, where a pilot will sense pressure, whether it will be upstream or downstream, and open and close the regulator based on whether it needs to allow more or less gas downstream. Flexible element regulators are widely used due to their size options, high range ability, low cost, accuracy and simple construction.

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