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Overview of Ball Valve

On August 11, 2015, in Other, by Lambert

A ball valve, invented in the 1950s, is a valve with a spherical disc. With the rapid development of technology and the ceaseless improvement of processing technique and product structure, the ball valve has been one kind of main valves in recent years. Now it is applied with an increasing speed at home and abroad. The ball valve is widely used in different industries, such as petroleum refining, long-distance transport pipes, chemical, paper making, pharmacy, water treatment system, electricity and so on.

A ball valve, one type of quarter turn valve, is quite literally a ball placed in a passageway through which fluid flows. The ball has a hole, by which the valve opens and closes. When the ball is positioned in this way where the hole runs the same direction as the passageway, the fluid simply flows through the hole, and the valve is open. However, when the ball is positioned in this way where the hole is perpendicular to the passageway, the fluid cannot pass through, and the valve is closed. The ball is controlled from outside of the valve, often with a handle that can be turned 90 degrees, or a quarter turn, back and forth for opening and closing the valve. Therefore, ball valve is an excellent choice for shutoff applications.

But with the development of technology, it also has the functions of throttling-control and fluid-control.

The ball valve has the following main features. What comes first is that the it is very versatile because it supports pressures up to 700 bars and temperatures up to 200°C and sizes typically range from 0.5 cm to 30 cm. secondly, the ball valve has such a simple structure that it is easy to operate and repair.

Thirdly, the seal and the ball are often in close state so that the ball valve is very reliable and not easy to be eroded by the working medium. Last but not least, with the PTFE valve seat ring the ball valve is quite durable and usually work to achieve perfect shutoff even after years of disuse. As for the types, there are five general body styles of ball valves: single body, three-piece body, split body, top entry, and welded. The difference among them is based on how the pieces of the valve-especially the casing that contains the ball itself-are manufactured and assembled. The valve operation is the same in each case.

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How to Make a Ball Valve

On August 16, 2013, in Other, by Lambert

Ball valves are used to control the flow of liquids, steam, chemicals and foods. They are simple, inexpensive and reliable valves that are often seen in laboratories, factories and food processing. They consist of a ball that can be rotated — usually through 90 degrees. A hole drilled through the ball, allows fluid flow when the hole in the ball is aligned with the flow. When the ball is rotated, the ball blocks the flow.

Instructions:

1. Clamp the ball in a vice and drill a hole through the ball. A ball with a single hole drilled all the way through it will make a ball valve that switches a single stream on and off. For a more complex valve, turn the ball and drill another hole from the surface of the ball to intersect the first hole. The balls with two holes are used where three lines come together. These ball valves can close off any one, or all three paths.

 

2. Attach a rod to the ball so the rod is perpendicular to the hole that goes through the ball. If you are using a plastic ball, the rod should be plastic and should be attached with crazy glue. If the ball is metal, the rod should be metal and should be welded. In either case, the joint should be polished smooth so the ball valve will move easily. The rod should terminate in simple metal handle. The handle should be attached in such a way that the handle lines up with the flow through the gate.

 

3. Install the ball valve. In the simplest cases this could be a simple as punching a small hole and inserting the ball and rod into a plastic tube. If this is the case, the handle should be attached only after the ball and rod are in place.

 

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