Pressure Regulator Selection Considerations
Pressure Regulator Selection Considerations
Some of the most important characteristics to consider include the following:
System Flow
Installing a properly sized regulator is key to maintaining desired pressure. The correct size is generally determined by the rate of flow in your system - larger regulators can handle higher flows while effectively controlling pressure, while smaller regulators are effective for lower-flow velocities. Sizing of regulator components is important, too. For example, it is more effective to control lower-pressure applications with a larger diaphragm or piston. All components should be sized appropriately based on your system’s requirements.
System Pressure
Since the primary function of your regulator is to manage system pressures, it is critical to ensure that your selection is appropriately rated for maximum, minimum, and operating system pressures. Pressure control ranges are typically prominently featured in regulator product specifications given their importance to proper regulator selection.
System Temperature
Industrial processes can range in temperature, and you should be confident that your choice of regulator can stand up to the typical expected operating conditions. Environmental factors are a consideration, as well as fluid temperatures and factors such as the Joule-Thomson effect, which causes rapid cooling due to pressure drops.
Process Sensitivity
The sensitivity of your process plays a role in determining the best mode of control to choose in your regulators. As noted, most regulators are either spring-loaded or dome-loaded. Spring-loaded regulators are controlled by an operator turning an external knob, which controls the spring’s force on the sensing element. Dome-loaded regulators, by contrast, use fluid pressure from within the system to provide the set pressure on the sensing element. While spring-loaded regulators are more common and tend to be more familiar for operators, dome-loaded regulators can help improve precision in applications that require it and may benefit automated applications.
System Media
Material compatibility between all elements of your regulator and your system media is important for component longevity and avoiding downtime. While some natural deterioration of rubber and elastomer components is expected, certain system media may contribute to accelerated deterioration and premature regulator failure.
With a deeper working knowledge of the types of pressure regulators available and how they function, you will be better equipped to make the right selection. Your regulator supplier should be able to provide you with sizing information, pressure and flow requirements, temperature ranges, and the correct mode of control for your system needs. You can start the selection process by comparing different regulators in different applications with our Regulator Flow Curve Generator, then following up with a local pressure control specialist for more information.
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