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Regulator Selection Guide

 

PRESSURE REGULATOR SUMMARY:

Does your application require the use of a pressure regulator? Before you choose the regulator that best fits your needs there are many design parameters to consider. Does your regulator need to be relieving or non-relieving? Do you need a single, dual or three stage regulator? What inlet and outlet pressure ranges do you expect to use in your design? Will you be sending gas or liquid through the regulator? Will you be testing the regulator with or without flow (dead ended)? What temperature will the seals in the regulator be exposed to?  Do you have limited space to work with and need something compact? Please read on and learn which regulator will provide the best performance for your demanding application. Once you have narrowed down your requirements you can find our selection of pressure regulators at:

Beswick Engineering Regulators

 

RELIEVING or NON-RELIEVING:

RELIEVING:   NON-RELIEVING:
A relieving (also known as self-relieving) regulator allows excess downstream pressure to be vented to atmosphere. For example, if you set a relieving regulator to an output pressure of 30 psi and then decided to reduce the output pressure to 10 psi the relieving regulator will vent the excess downstream pressure (20 psi) and allow the outlet pressure to immediately decrease to the desired 10 psi even if there is no flow (dead ended). A relieving regulator is usually more convenient to use in pneumatic systems because you can easily decrease the downstream pressure even if there is no flow.   A NON-relieving regulator will NOT vent excess downstream pressure to the atmosphere. For example, if you set a NON-relieving regulator to 30 psi output and then decided to reduce the output pressure to 10 psi the NON-relieving regulator will NOT immediately decrease to the desired 10 psi if there is no flow (dead ended). If there is flow, the output pressure will decrease to the desired set point as the excess downstream pressure is consumed. A NON-relieving regulator is preferred for use with hazardous, explosive, or expensive gases because no gas is allowed to vent to atmosphere.

 

 

SINGLE, DUAL, OR THREE STAGE REGULATOR:

SINGLE STAGE: Inlet Pressure Range:   Up to 500 psig  
  Outlet Pressure Range: 0 to 30 psig (most models) 0 to 20 psig (PRDB-8MM)

A single stage regulator is recommended for applications where the inlet pressures will remain relatively constant over time.

 

 

DUAL STAGE: Inlet Pressure Range:  Up to 500 psig (1,200 psi SS models)  
  Outlet Pressure Range: 0 to 30 psig (most models) 0 to 20 psig (PRD2 & PRD28)

A dual stage regulator is well suited for applications involving fluctuating inlet pressures over time, for example with compressed gas cylinders (tanks). As the gas is depleted from the tank the second stage in the regulator will compensate for the decreased inlet pressure resulting in stable outlet pressures. When constant delivery pressures are critical a dual stage regulator is ideal.

 

 

THREE STAGE: Inlet Pressure Range: Up to 3000 psig
  Outlet Pressure Range: 0 to 30 psig

A three-stage pressure regulator accurately reduces high pressures (3,000 psi for example). The three stage regulator minimizes droop or rise, even with wide swings in inlet pressure. It is an excellent choice if the inlet pressures will decay over time, similar to the dual stage.

 

 

OUTLET PRESSURE RANGES:

Will you be using a higher outlet pressure range (30-400 psig) or a very low outlet pressure range (0-30 psig)? Beswick manufactures two (diaphragm and piston) style regulators to satisfy your design requirements.

Applications specifying higher outlet pressure ranges (30- 400 psig) are best suited for Beswick’s piston design. Applications requiring a low outlet pressure range (0-30 psig) are ideal for Beswick’s diaphragm design. 

Using a low outlet pressure range (0-30 psig)?

Beswick’s Diaphragm Regulators are manufactured with a sensing area that is much larger than a piston style regulator, this larger sensing area enables outlet pressures to reach very low outlet pressures, (0-30 psig). The following regulators are available with a diaphragm. 

PRD, PRDB, PRDB8, PRDHF, PRDHF8, PRD2, PRD28, PRD3, PRD3HP

 

Using a low outlet pressure range (0-20 psig.)?

Beswick’s Diaphragm Regulators are manufactured with a sensing area that is much larger than a piston style regulator, this larger sensing area enables outlet pressures to reach very low outlet pressures, (0-20 psig). The following regulators are available with a diaphragm. 

PRD2 & PRD28

 

Using a high outlet pressure range (30-400 psig.)?

Beswick’s piston regulators are the best suited for applications with higher outlet pressure ranges (30-400 psig.) These regulators work well with the higher pressure range but result in some hysterisis at very low outlet pressures and flows. The following regulators are available with a piston.

PR, PR2, BPR

 

 

INTERNAL SEALS:

 

Beswick’s regulators are assembled with a Buna-N O-ring unless otherwise notified. Buna-N satisfies a wide range of applications, but if your application involves extreme temperatures or sensitive fluids, Beswick offers several other O-ring materials. Please check our factory for the best O-ring to use in your application. Viton and EPDM are available when required.

Replacement O-Rings