October 28, 2008

Type of Valves - Ball Valve

In the last article I discussed brief & important things about Globe Valve. Today I will discuss some basics of Ball Valve.



The Ball valves as name suggests is having a ball type spherical body. They are stop valves that use a ball to stop or start the flow of fluid. The ball performs the same function as the disk in the globe valve.

Ball Valves
This rotational-motion valve uses a ball-shaped disk with a hole bored through to stop or start fluid flow. When the valve handle is turned to the open position, the
ball is rotated so that the hole lines up with the valve body’s inlet and outlet.

When the ball is rotated so the hole is perpendicular to the flow, the valve is closed. Because the ball moves across the seats with a wiping motion, ball valves can handle fluids with suspended solids.

When the valve is shut, which requires only a 90-degree rotation of the handwheel for most valves, the ball is rotated so which is divided in two parts by a baffle. Flow direction is steeply changed in this type of valve so the controlling of flow is better by the movement of restriction element.

Most ball valves are of the quick-acting type (requiring only a 90-degree turn to operate the valve either completely open or closed), but many are planetary gear operated. This type of gearing allows the use of a relatively small handwheel and operating force to operate a fairly large valve. The gearing does, however, increase the operating time for the valve. Some ball valves contain a swing check located within the ball to give the valve a check valve feature. Ball valves are normally found in the following systems aboard ship: seawater, sanitary, trim and drain, air, hydraulic, and oil transfer.

Ball valves are available in Venturi, reduced and full-port patterns. The full-port pattern has a ball with a bore equal to the inside diameter of pipe. Most ball valves instead have a reduced bore with a Venturi shaped flow passage of about three quarters the nominal valve size.

CONCLUSION
Uses a large lever to turn a ball that closes or opens the flow with one quick quarter turn.

Ball Valves are mainly used in fluids containing solids.

Ball Valves have lower pressure drops.

Are the standard for natural and LP gas, replacing the older plug valves that were traditionally used as gas valves. Now Ball Valves are standards for gas service also replacing Plug Valves.

Available in either metal or plastic, threaded or non-threaded types.

Ball valves with double-stem seals provide greater durability.

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8 comments:

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valves said...

Your article is amazing. It helped me a lot with my research about different kinds of valves and actuators and how this stuff works with other mechanical devices...

again,thanks a lot.

mugen

gate valves said...

what a nice illustration. very informative.

123 123 said...

Interesting post you got here. I'd like to read something more about this topic.
BTW check the design I've made myself Overnight escort

plumbing said...

Valves usual cause of failure is just because the installer has no idea what these types of valves are intended to do such as main steam shut off's or water mains. If properly used and installed correctly these valves last many years under extreme conditions.

Sürgülü Vana said...

Excellent Explanation. Helped very much ! thanks!!

A Lloyd said...

The very detailed explanation about the mechanics of ball valves and other valve configurations is much appreaciated. The valve diagram / drawing is also very useful!

http://alloy-valves.com said...

Industrial, petrochemical valves are generally used for flow control.

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