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A Basic Idea On Valve And Its Types

A Basic Idea On Valve And Its Types

We have come across pipelines all around that efficiently transport vast amounts of liquids and gases (collectively called as fluids). But they need a regulating body to choose the amount of the stream and to start and stop the stream for their efficient working. Here, valves come into picture and are the regulating body that control the stream rate and act as a switch to start and stop the stream.

Valves are mechanical devices that obstruct pipes or passages of liquids and gases either wholly or partially to control the stream rate as required. In our lives we come across many valves daily, but might have never noticed them. The taps that we open and close to control the progression of water is a valve. The regulators that we use to control the progression of gas from our gas pipelines are also valves. There are gas control valves in our cookers too. These valves are not limited to man-made things, but are found naturally and that too in our bodies. Our heart has valves that help in regulating the progression of blood in our body.

Valves are either made of plastic or metal and can be controlled either by handles, levers, pedals and wheels or can be controlled automatically. Generally, the exterior parts are either metal or plastic and are called seat and the inner part generally has plastic and elastic valves for an effective van hàn quốc control of the progression of fluids. Body is the inner part of the valve that fits on the seat and controls the stream by opening and closing either partially or wholly depending upon the requirement of the stream rate.

Ball valves are usually quarter turn valves (as we turn the switch by 90 degrees to start or stop the stream) and use an empty, perforated and pivoting ball that is also called as a floating ball. It is through this valve that the progression of fluids takes place. When the switch or handle is turned to 90 degrees, the opening of the ball gets aligned with the line opening and starts the stream. When again the switch is turned by 90 degrees, the opening turns around and the ball blocks the opening of the line thus causing the stream to stop.

There are many types of ball valves that are extensively used in various industries depending upon their designs, sizes and pressure handling capacities. Full port, reduced port, cavity filler, V port, trunnion ball valves and multiport valves are the common ones.

Full port valves are used when there is a requirement of free stream rate of fluids. This valve has an oversized ball with a major opening to allow tremendous quantities to move through it. But when there is a requirement of high pressure in the stream, reduced port valves are preferred. A common example is the line heads that are used for a car wash. As we require pressure in water stream, this type of valve is used in them. Trunnion ball valves have a disk or anchoring above and underneath the valve generally suitably when there is a large and high pressure stream rate requirement.

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