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How to choose a proper gas pressure regulator (gas governor)

DATE:2014-01-08 | comments: | posted by:liuailin

You must be puzzled when choose a gas pressure regulator (gas governor),how to do? Hope the following tips will give you some direction.

From the angle of gas type:

1.General Gas Use. For general use, regulators of brass construction with elastomeric diaphragms will give good service in noncorrosive service where slight contamination or diffusion from an elastomeric diaphragm is not important. Brass regulators with stainless steel diaphragms prevent air diffusion and adsorption of gases on the diaphragm. This is particularly important with low concentration mixtures of hydrocarbons in which the trace component may be adsorbed on the elastomeric diaphragm. The gas regulator must be constructed using materials suited to the application. Industrial general purpose regulators are often constructed with either Buna-N or Neoprene diaphragms. Regulators with Buna-N or Neoprene diaphragms are not suitable for GC analysis that can be affected by the diffusion of atmospheric oxygen through the elastomer diaphragm or the outgassing of monomers and dimers from the elastomer. In fact, laboratories that perform temperature programmed analysis are faced with excessive baseline drift and large unresolved peaks due to this diffusion and outgassing.

2. High-Purity Gas Service. The ideal construction for high-purity gas service is a gas regulator that has a stainless steel diaphragm. Such regulators are not contaminating and assure satisfactory use for all applications of noncorrosive and mildly corrosive gases. Regulators for corrosive gases must be selected from those recommended with each gas listing.

A gas regulator equipped with a stainless steel diaphragm has several advantages over the elastomeric type. It does not outgas organic materials and it also prevents the diffusion of atmospheric oxygen into the carrier gas. Both Buna-N and Neoprene diaphragms are permeable to oxygen. The chemical potential of oxygen between the carrier gas and the atmosphere provides sufficient driving force for oxygen to intrude the carrier gas through a permeable diaphragm.

How to choose a gas regulator which is suitable your appliance after deciding the gas type?

The inlet and outlet pressures are important factors to consider before choosing the best regulator. Important questions to answer are: What is the range of fluctuation in the inlet pressure? What is the required outlet pressure? What is the allowable variation in outlet pressure?

The flow rate/capacity should be considered before choosing the best regulator(governor). What is the maximum flow rate that the application requires? How much does the flow rate vary? Porting requirements are also an important consideration.

Another factor should be considered is temperature. The primary concern is whether or not the elastomer chosen will function properly throughout the expected temperature range. Additionally, the operating temperature may affect flow capacity and/or the spring rate in extreme applications.

The last factor should be pay attention to is size&weight.In many instances space is limited and weight becomes a factor. Double check the port sizes, adjustment styles and mounting options available. If taking all the factors into consideration, the best gas pressure regulator(gas controller) you have chosen.

 
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