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Difference between revisions of "Ball Valves"
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* Please start editing this page after the /noinclude | * Please start editing this page after the /noinclude | ||
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[[File:Ball Valves.jpg|thumb|right|Ball Valves]] | |||
[[File:Ball valve2.jpg|thumb|right|Ball Valves]] | |||
'''Ball Valve''' is a valve with a spherical disc, 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 Valve''' is a valve with a spherical disc, 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. | ||
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A ball-check valve is a type of check valve with a ball without a hole for a disc, and is not covered in this article. | A ball-check valve is a type of check valve with a ball without a hole for a disc, and is not covered in this article. | ||
==Types of ball valve== | ==Types of ball valve== | ||
There are five general body styles of ball valves: single body, three piece body, split body, top entry, and welded. The difference 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. | There are five general body styles of ball valves: single body, three piece body, split body, top entry, and welded. The difference 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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* A floating ball valve is one where the ball is not held in place by a trunnion. In normal operation, this will cause the ball to float downstream slightly. This causes the seating mechanism to compress under the ball pressing against it. Furthermore, in some types, in the event of some force causing the seat mechanism to dissipate , the ball will float all the way to metal body which is designed to seal against the ball providing a somewhat failsafe design. | * A floating ball valve is one where the ball is not held in place by a trunnion. In normal operation, this will cause the ball to float downstream slightly. This causes the seating mechanism to compress under the ball pressing against it. Furthermore, in some types, in the event of some force causing the seat mechanism to dissipate , the ball will float all the way to metal body which is designed to seal against the ball providing a somewhat failsafe design. | ||
Manually operated ball valves can be closed quickly and thus there is a danger of water hammer. Some ball valves are equipped with [[Actuators]] that may be pneumatically or motor operated. These [[Valves]]can be used either for on or off or flow control. A pneumatic flow control valve is also equipped with a positioner which transforms the control signal into actuator position and valve opening accordingly. | Manually operated ball valves can be closed quickly and thus there is a danger of water hammer. Some ball valves are equipped with [[Actuators]] that may be pneumatically or motor operated. These [[Valves]] can be used either for on or off or flow control. A pneumatic flow control valve is also equipped with a positioner which transforms the control signal into actuator position and valve opening accordingly. | ||
==Sources== | ==Sources== | ||
[http://en.wikipedia.org/wiki/Ball_valve Wikipedia Ball valve] | [http://en.wikipedia.org/wiki/Ball_valve Wikipedia Ball valve] | ||