FREQUENTLY ASKED QUESTIONS ABOUT SPECIALTY GASES

What is the difference between a single-stage gas pressure regulator and a two-stage gas pressure regulator?

Single-stage gas pressure regulators reduce the cylinder pressure to the delivery pressure in one step, where a two-stage gas pressure regulator accomplishes the same thing with two stages of pressure reduction. This means that a single-stage regulator has to be adjusted to maintain a constant pressure as thegas in the cylinder is used, but a two-stage regulator does not. Two-stage regulators are typically used when more stability of operation is required and are often used in specialty gas applications, like gas chromatography.

On the other hand, if gas is being used for a short duration instrument calibration, a single-stage gas regulator with a wide accuracy envelope (supply pressure effect) but a comparatively flat droop should be chosen. This will eliminate the need to allow the gas to flow at a constant rate before the calibration can be done.

To learn more about the difference between single-stage gas pressure regulators and two-stage gas pressure regulators, please read our article “How to Choose a Gas Regulator That's Right For Your Application.”

Scott offers a variety of other online resources related to gas pressure regulators:

• Please review our instructions for Operations and Handling before using your pressure reduction regulator.
  
  
• For tips on maximizing your gas regulator’s performance and extending the service life of system components, please read our Compressed Gas Regulator Maintenance Guide.
  
  
• Registered visitors of Scottgas.com may also access Equipment iBooks for instructions on the proper use of gas pressure regulators and other Scott gas handling equipment.