Isolatable Non-Slam Piston Check Valve
First Claim
1. A valve assembly comprising:
- a valve body with a central passage having a central axis, an upstream end for receiving a fluid, and a downstream end for discharging the fluid;
a segment ball valve operable to rotate between a valve open position to allow the fluid to flow through the central passage and a valve closed position to prevent the fluid from flowing through the central passage;
a check valve located within the central passage downstream from the segment ball valve, biased to prevent the fluid from traveling upstream through the central passage and to allow the fluid to travel downstream past the check valve;
a locking mechanism selectively securing the check valve in a locked position to prevent the fluid from flowing past the check valve; and
a cavity located between the segment ball valve and the check valve, the cavity sealable between the segment ball valve in the valve closed position and the check valve in the locked position to contain a neutral media.
1 Assignment
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Accused Products
Abstract
A valve assembly includes a valve body with a central passage, an upstream end for receiving a fluid, and a downstream end for discharging the fluid. A segment ball valve rotates between a valve open position to allow the fluid to flow through the central passage, and a valve closed position to prevent the fluid from flowing through the central passage. A check valve located within the central passage downstream from the segment ball valve is biased to prevent the fluid from traveling upstream through the central passage, and to allow the fluid to travel downstream past the check valve. A locking mechanism secures the check valve in a locked position to prevent the fluid from flowing past the check valve. A sealable cavity is located between the segment ball valve and the check valve, to contain a neutral media to achieve a double block and bleed feature.
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Citations
20 Claims
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1. A valve assembly comprising:
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a valve body with a central passage having a central axis, an upstream end for receiving a fluid, and a downstream end for discharging the fluid; a segment ball valve operable to rotate between a valve open position to allow the fluid to flow through the central passage and a valve closed position to prevent the fluid from flowing through the central passage; a check valve located within the central passage downstream from the segment ball valve, biased to prevent the fluid from traveling upstream through the central passage and to allow the fluid to travel downstream past the check valve; a locking mechanism selectively securing the check valve in a locked position to prevent the fluid from flowing past the check valve; and a cavity located between the segment ball valve and the check valve, the cavity sealable between the segment ball valve in the valve closed position and the check valve in the locked position to contain a neutral media. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A valve assembly comprising:
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a single member valve body comprising; a central passage having a central axis; an upstream end for receiving a fluid and a downstream end for discharging the fluid; a ball valve seat, the ball valve seat being annular and located on an inner diameter of the central passage; a check valve seat, the check valve seat being annular and located on the inner diameter of the central passage, the ball valve seat being closer to the upstream end and the check valve seat being closer to the downstream end; and a cavity located between the ball valve seat and the check valve seat; a segment ball operable to rotate between a valve open position with the segment ball spaced from the ball valve seat and a valve closed position with the segment ball in sealing engagement with the ball valve seat; a check valve piston biased to prevent the fluid from traveling upstream through the central passage and to allow the fluid to travel downstream past the check valve piston; a locking mechanism selectively engaging the check valve piston and securing the check valve piston in a locked position in sealing engagement with the check valve seat; and
whereinthe cavity comprises a sealed space when the segment ball is in the valve closed position and the check valve piston is in the locked position. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method for controlling flow of a fluid, the method comprising:
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(a) providing a valve assembly having a single member valve body with both a segment ball valve and a check valve located within a central passage of the single member valve body, the segment ball valve having a open position to allow the fluid to flow through the central passage, and the check valve biased to prevent the fluid from traveling in an upstream direction through the central passage and to allow the fluid to travel in a downstream direction past the check valve (b) rotating the segment ball valve to a valve closed position to prevent the flow of the fluid through an upstream end of the central passage; (c) moving a locking mechanism of the valve assembly to secure the check valve in a locked position; and (d) containing a neutral media in a cavity located between the segment ball valve and the check valve. - View Dependent Claims (17, 18, 19, 20)
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Specification