Specialty Gas Equipment
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High purity gases require high purity distribution equipment to prevent contamination as pressure is regulated to working pressure. You will find single and two stage regulators, purge assembles, and several other speciality gas products that meet your rigorous high demands for distribution of 99.999 and 99.9999% pure or 5.0 and 6.0 purity gases. If you don't see what you need, contact Rexarc to have us design a system that meets your requirements.
Choosing a Rexarc Regulator
Both here and in our New Specialty Gas Equipment Catalog you will find help in how to choose a regulator, where to find details on the regulator that meets your needs. The following are some of the most important factors you need to know prior to deciding which Rexarc regulator is right for your application. While this is not a comprehensive list, it is a good start in determining your regulator choice. If at any time during the process you need additional help, our customer service personnel would be happy to assist you or answer any other questions you may have.
Materials of Construction
The materials that make up your regulator are one of the most important factors in selecting a regulator. Equipment products that are effective for one gas may not be appropriate, or may be very dangerous to use in another gas service. The properties of the gas determine the materials of construction needed for a regulator to function properly. Please refer to the Gas Compatibility Table for more information. But as a basic primer, brass regulators are compatible with most non-reactive gases. 316L stainless steel regulators are corrosion resistant and therefor suitable for many of the anhydrous corrosive gases such as nitric oxide (NO) and nitrogen dioxide (NO2). Chrome-plated brass regulators should be treated just like brass regulators.
Maintaining Gas Purity (Forged or Barstock Bodies)
Forged body regulators are more economical than barstock regulators. However, the internal wetted surface area is greater and the surface rougher than barstock. These factors add to the increased contamination potential, since evacuation of ambient atmosphere through vacuuming or purging is more difficult. Barstock regulators have all wetted surfaces machined to a smooth finish and have a smaller internal volume. All these factors apply to brass, chrome-plated brass and stainless steel regulators.
Inlet Pressure Rating
The pressure regulator chosen must be able to handle the gas supply pressure. Be sure to determine the supply pressure from your gas supplier or from the gas source and use a regulator that can handle that pressure. When in doubt, call Customer Service.
Delivery Pressure Range
The basic object of a pressure regulator is to reduce the supply pressure (either from a cylinder or other gas supply source) to a level compatible with the system or process in use. Rexarc's increased number of regulator choices just about assures you there is one suitable for your needs in our line.
Single Stage or Dual Stage
Single stage regulators reduce pressure in one step. If used on a cylinder, you will notice a slight rise in the outlet pressure as cylinder pressure falls with use. If this is tolerable in your application, or if you are using liquefied gas like propane, then a single stage regulator may be suitable. They are also suited for situations where the outlet pressure is constantly monitored and adjusted. Dual stage regulators are actually two regulators in one. They have a nonadjustable first state usually set at 250-300 psig which feeds gas at that reduced pressure to the second stage. There it is further reduced to the working pressure required. The result is a constant deliver pressure throughout the usable life of the cylinder. They are ideally suited to situations where constant delivery pressure is essential.