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Introduction of Welded Non-Return Valves

What do you know about welding and a welded non return valve? Use of welding and cutting in the manufacturing process of many machine parts is very common. This is achieved through a system of increasing the temperature of the cutting or welding flame by using a mixture of gases. Ordinary mixture of air and propane would burn at 3,650 º F. If we were to replace the air with pure oxygen then the temperature is increased to 4,320º F. In order to increase the temperature of the flame further acetylene is used instead of propane.

When the temperature is increased to these levels, the metal melts and becomes easy to cut and fashion them in the manner that we desire. In the welding process the metals are fused together in the common metal which is melted together. In the cutting process the oxygen is used to raise the temperatures and when the metal forms a slag with the oxygen it is drained out and thus the cutting is done.

Welded Non Return Valve consists of two parts which are divided by the regulator which may consist of a disc, a diaphragm or a piece of tube. The inlet portion of the valve lets the flow of fluid in and the outlet portion lets the fluid out. Once the pressure on the upstream section is high enough the valve will start to function and this is known as the cracking pressure. When the pressure falls or the disc is manually closed the fluid is no longer able to flow through the opening.

The valve may be made of plastic or metal depending on the usage and the size of the operation. The welding process has imminent dangers associated with it. The acetylene is highly explosive and may explode when there is a detonation wave in the tank. The wave has to be arrested and a simple check valve will not be sufficient. One would need a flashback arrestor to do the job. The check valves are provided in the torch or the tank depending on the country of usage.

In the welded non return valve, the flow forces are very high and the components are made of steel or brass. The working pressure may go up to 15 000 psi and at those pressures it is necessary for the valve to be able to stand the working force. The welded non return valve is designed to operate under high pressure conditions. One uses of this valve is to make sure that the fluid flow conditions are maintained and there is adequate safety within the system.

Due to its ruggedness, the valve is able to operate at pressures and temperatures which are very much above the normal. The innate hardness makes the valve easy to maintain. It is tough to imagine a world which could operate without the essential items like the valve. The valves are put to different uses like in metering, as a check valve, a needle shut off, or as a ball valve or a relief valve. Taking part in various manufacturing processes and delivering the fluids on time have made the valves indispensable.

(Edited by Eloise Tsai)

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