Do you know what is a ball valve?
A ball valve is basically a valve with a spherical disc (like a ball/hemisphere), the part of the valve which controls the flow through it. The sphere has a hole, or port, through the middle so that when the port is in line with both ends of the valve, flow will occur. When the valve is closed, the hole is perpendicular to the ends of the valve, and flow is blocked. The handle or lever will be inline with the port position letting you "see" the valve's position. The ball valve, along with the butterfly valve and plug valve, are part of the family of quarter turn valves.
Ball valves are tough, durable and work to achieve perfect shutoff. It is not designed to be gradually open and allowing the flow. It works only to open or off the flow. Hence, it is an excellent choice for shutoff applications. Other valves such as butterfly, globe or gate valve is not suitable for those type of processes. As mentioned earlier, ball valve do not offer the fine control that may be necessary in throttling applications but are sometimes used for this purpose (not advisable).
Ball valves are used extensively in industry because they are very versatile, supporting high pressures, even up to 700 bars and high temperatures up to 200°C. Sizes typically range from 0.5 cm to 30 cm. Ball valve are easy to maintain as it comes with several types of option such as single piece, double or tripple piece. A three piece body and two piece body ball valve is easier to maintain as it can be dismantled for cleaning and servicing.
The body of a ball valve can be made of metal, plastic or metal with a ceramic center. The ball is often chrome plated to make it more durable. The bigger the ball valve, the more expansive it is.
Labels: ball valve, basic, fundamental