Pressure Regulator - Brass Body With Stainless Steel Diaphragm, Single And Double Stage Diffusion Resistant Design For High Purity Gas Handling at Best Price in Kolkata | Special Gas & Equipment Solutions Pvt. Ltd.

Pressure Regulator - Brass Body With Stainless Steel Diaphragm, Single And Double Stage Diffusion Resistant Design For High Purity Gas Handling

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Product Specifications

Body Material	Brass/SS
Compliance	ISO 9001
Diaphragm Material	SS/Elastomer
Features	Pressure Control, Gas Handling, Safety, Accuracy, Reliability, Efficiency, Durability, Versatile, Cost-effective
Flow Rate	Variable
Pressure Range	Variable
Product Type	Gas Regulator
Stages	Single/Double
Usage	Gas pressure reduction for equipment and instruments

Product Overview

Key Features

Regulator And Accessories

Pressure Regulator
A pressure regulator is a device which is used to reduce the pressure of gas from a high pressure cylinder or any other source to a workable level that can be safely utilised for operating equipment and instruments.

How Many types of Regulator are there

Basically two types of Regulators are used very widely. Those are

Single Stage
Double State (Two Stage)

Also based on Diaphragm (an integral part of Regulator) regulators can be divided into three catagories.
Brass Regulator with Elastomeric Diaphragm: Used where contamination and diffusion is tolerable. Such as weilding, gas cutting etc.
Brass Regulator with Stainless Steel Diaphragm: Used where contamination and diffusion is not acceptable. The SS diaphragm prevents contamination and diffusion. However Brass body is recommended for mildly corrosive gases like H₂S, NO, NO₂ etc
Stainless steel Regulator with Stainless Steel Diaphragm: This kind is also used where contamination and diffusion is not acceptable. It is used for both non corrosive and mildly corrosive gases. It is not recommended for highly corrosive gases like Cl₂ etc.

Single Stage Regulator vs Double Stage

Single Stage Regulator reduces pressure in a single step to deliver a pressure within a specific range. Regulators designed in this way will show a slight variation in delivery pressure as the cylinder pressure falls during use. For this reason, single stage regulators are best suited for applications where a constant outlet pressure is not critical, where an operator can monitor and readjust pressure, or where inlet pressure is constant.

Double stage regulator perfoms the same function as single stage regulator. However delivery pressure remains constant as cylinder pressure decreases and greater accuracy in pressure control is maintained because the pressure the pressure reduction is performed in two steps. Double Stage regulators are recommended for applications requiring a constant outlet pressure over a life of a gas.

Diffusion Resistant Regulator

It is not only important to have the correct quality of gases, it is equally important to handle the gases by using equipment most suited for the application.

Contamination of pure gases and calibration gases by inappropriate regulators, tubing, flowmeters, valves and connections etc. through diffusion and outgassing is a known phenomenon. Consequently, in order to obtain calibration and high purity gases in the specified quality at the point of use all metal non contaminating and diffusion resistant gas handling equipment like regulators, valves, non return valves, tubing and fittings.

Sources of Error When Transferring Gases

Reduction in component concentrations - increase in Absorbent Surface Area.

ERROR: Employment of unsuitable material
IMPACT: Chemical Reaction, especially in the presence of moisture.

Reduction in Assayed Components Contamination through undesired components

ERROR: Ad/Desorption on surface area.
IMPACT: Gas molecules are given off in the gas stream. Components adhere to surface area.

Pure gas constantly being contaminated

ERROR: Line leaks.
IMPACT: Partial pressure gradients between different gases forces gas molecules towards the side with lower partial pressure, regardless pressure.

Irregular contamination of pure gas, reducing after extended period of withdrawal.

ERROR: Dead volume is not taken in account.
IMPACT: Pressure drifts as well as the motion of the molecules themselves; contaminate the pure gas stream with foreign gases from the dead area.

Contamination of pure gas increase as hose length increases and temperature rises.
ERROR: Permeation through hose walls.
IMPACT: Even after first purge, foreign gas molecules enter stream of gas ( H₂O, CO₂, HC etc)

Retro Diffusion
An elaborate study was undertaken and it was found that Argon Gas (taken as a test gas for this study) with 5 ppm of Oxygen impurity at a pressure of 10 Bar when passed at the rate of 5 LPH through a rubber tube with 1 mtr long and 2 mm ID, got contaminated by atmospheric Oxygen and the level of Oxygen

raised upto 40 ppm from 5 ppm. It is simply due to the difference in the partial pressure of the gas in the two environments. This phenomenon is called as RETRO DIFFUSION.

Following table shall give you an idea about the other material that are commonly used in gas handling

Material: Contamination of O₂
Stainless Steel: 0 ppm
Mylar: 0.02 ppm
PTFE: 13 ppm
PVC: 27 ppm
Natural Rubber: 40 ppm

Careful consideration should therefore, be given in selecting the gas handling equipment. The choice of the gas handling equipment for pure gases and Calibration standards is governed by the nature of gas, the pressure involved, the flow rates desired and requirements of safety.

The function of a regulator is to convert the high pressure of gases to lower working ranges. Secondarily the regulator maintains constant working pressure on the outlet of the regulator inspite of variation in inlet pressures. This enables the process to be carried out without the need for constant manual adjustment. In addition, the regulator offers safer , low working pressures. A regulator controls the pressure but does not control flow and therefore, a flow control device is needed, where flow control is critical.

BOC offers a wide range of regulators designed to handle calibration gas standards and high purity gases for chromatography and other process applications. These are specially designed, engineered and quality assured to ensure diffusion resistance and handle safely a wide range of XL grade and other higher pure gases, Calibration Standards, Toxic and mildly corrosive gases.

Tests are Carried Out For Regulators

Maximum Discharge test
Stabilised Outlet Pressure Test
Flow characteristics Test
Mechanical Strength Test
Seat Leak Test & Overall Leak Test
Dimensional Checking Test
Calibration of Inlet and Outlet Pressure Gauges

Application
Diffusion resistant Non contaminating all metal regulators are used in applications where integrity of gas has to be maintained such as:

High Purity gas handling
Chromatographic carrier gases
Calibration gas standards for calibration of analytical equipment.
Electronic and semiconductor grade gas.
Gas Sampling lines.
Gases used for Corrosive, Toxic, and Reactive.

Material Compatibility Chart

Name of Gas	Al	Cu	Brass	SS	Model
Acetylene	Y	X	X	Y	Y
Ammonia	Y	X	X	Y	Y
Argon	Y	Y	Y	Y	Y
Butane	Y	Y	Y	Y	Y
Carbon di oxide	Y	Y	Y	Y	Y
Carbon monoxide	Y	Y	Y	Y	Y
Ethane	Y	Y	Y	Y	Y
Ethylene	Y	Y	Y	Y	Y
Helium	Y	Y	Y	Y	Y
Hydrogen	Y	Y	Y	Y	Y
Methane	Y	Y	Y	Y	Y
Nitrogen	Y	Y	Y	Y	Y
Oxygen	Y	Y	Y	Y	Y

Selecting Regulators for Xl Grade Gases & Calibration Standards

Have small dead volume
Have low leak rates and individually tested for leaks prior to delivery.
Manufactured predominantly from metallic diaphragm.
Have gas wetted parts of SS with high surface quality.
Have only parts that are chemically resistant to the gases for which they are rated.

Ordering Information