In-line back pressure fluid regulator

Abstract

In-line back pressure fluid regulators are described. An example in-line fluid regulator includes a regulator body defining a sensing chamber and an outlet of a fluid flow path of the fluid regulator. The outlet is in fluid communication with the sensing chamber via a first flow passageway in the regulator body. A bonnet is coupled to the regulator body and defines an inlet of the fluid flow path and a loading chamber disposed between the sensing chamber and the inlet. The loading chamber is substantially sealed relative to the fluid flow path of the fluid regulator. A pressure sensor is disposed between the inlet and the sensing chamber, where the pressure sensor defines a second flow passageway to fluidly couple the inlet and the sensing chamber.

Description

technical field

[0001] The disclosure herein relates generally to fluid regulators, and more specifically to coaxial backpressure fluid regulators. Background technique

[0002] Process control systems often employ pressure regulators (eg, back pressure regulators) to control or maintain the pressure of process fluids to protect instruments or other control equipment that are sensitive to high pressures. Fluid regulators, such as back pressure regulators, typically include a fluid valve assembly with a pressure sensor, such as a piston, to sense the pressure of the pressurized fluid at the inlet of the regulator. When the pressure of the pressurized fluid at the inlet exceeds a reference or set pressure (such as provided by the fluid regulator), the pressure sensor causes the flow control element of the fluid valve to open to allow fluid to flow through the regulator body between the inlet and outlet , wherein the regulator body can be coupled to a low pressure system utili...

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