Pressure balanced fluid control device
First Claim
1. A device adapted to have a working fluid flow therethrough, said device comprising:
- a body;
a valve stem operatively coupled to a gate positioned in said body;
a valve stem seal positioned around said valve stem, wherein a sealed cavity exists above said valve stem seal; and
an opening in fluid communication with said sealed cavity and an interior region of said body, said opening allowing a pressure of said working fluid to be exerted in said sealed cavity above said valve stem seal.
3 Assignments
0 Petitions
Accused Products
Abstract
The present invention is directed to a pressure balanced fluid control device. In one illustrative embodiment, the device comprises a body, a bonnet coupled to the body, a valve stem operatively coupled to a gate positioned in the body, a valve stem seal positioned between the valve stem and the bonnet, wherein a sealed cavity exists above the valve stem seal, and an opening through the bonnet that is adapted to allow a pressure of a working fluid flowing through the valve to be exerted in the sealed cavity above the valve stem seal. In another illustrative embodiment, the device comprises a body, a bonnet coupled to the body, a valve stem operatively coupled to a gate positioned in the body, a valve stem seal positioned between the valve stem and the bonnet, wherein a sealed cavity exists above the valve stem seal, and an opening through the bonnet, the opening being in fluid communication with the sealed cavity and an interior region of the body. In a further illustrative embodiment, the device comprises a body, a bonnet coupled to the body, a valve stem operatively coupled to a gate positioned in the body, a valve stem seal positioned between the valve stem and the bonnet, wherein a sealed cavity exists above the valve stem seal, a piston chamber formed in the bonnet, the piston chamber being in fluid communication with the sealed cavity and an interior region of the body, and a piston positioned in the piston chamber.
16 Citations
65 Claims
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1. A device adapted to have a working fluid flow therethrough, said device comprising:
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a body;
a valve stem operatively coupled to a gate positioned in said body;
a valve stem seal positioned around said valve stem, wherein a sealed cavity exists above said valve stem seal; and
an opening in fluid communication with said sealed cavity and an interior region of said body, said opening allowing a pressure of said working fluid to be exerted in said sealed cavity above said valve stem seal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device adapted to have a working fluid flow therethrough, said device comprising:
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a body;
a bonnet coupled to said body;
a valve stem operatively coupled to a gate positioned in said body;
a valve stem seal positioned between said valve stem and said bonnet, wherein a sealed cavity exists above said valve stem seal; and
an opening through said bonnet that allows a pressure of said working fluid to be exerted in said sealed cavity above said valve stem seal. - View Dependent Claims (10, 11, 12, 13)
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14. A device, comprising:
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a body;
a bonnet coupled to said body;
a valve stem operatively coupled to a gate positioned in said body;
a valve stem seal positioned between said valve stem and said bonnet, wherein a sealed cavity exists above said valve stem seal; and
an opening through said bonnet, said opening being in fluid communication with said sealed cavity and an interior region of said body. - View Dependent Claims (15, 16, 17, 18)
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19. A device adapted to have a working fluid flow therethrough, said device comprising:
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a body;
a valve stem operatively coupled to a gate positioned in said body;
a valve stem seal positioned around said valve stem, wherein a sealed cavity exists above said valve stem seal; and
an opening through said body that allows a pressure of said working fluid to be exerted in said sealed cavity above said valve stem seal. - View Dependent Claims (20, 21)
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22. A device adapted to have a working fluid flow therethrough, said device comprising:
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a body;
a bonnet coupled to said body;
a valve stem operatively coupled to a gate positioned in said body;
a valve stem seal positioned between said valve stem and said bonnet, wherein a sealed cavity exists above said valve stem seal; and
an opening through said bonnet that allows said working fluid to enter said sealed cavity, thereby exerting a pressure of said working fluid in said sealed cavity above said valve stem seal. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A device adapted to have a working fluid flow therethrough, said device comprising:
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a body;
a bonnet coupled to said body;
a valve stem operatively coupled to a gate positioned in said body;
a bonnet cap coupled to said bonnet;
a roller screw assembly operatively coupled to said valve stem, said roller screw assembly comprising a housing, a portion of which extends through said bonnet cap;
a first valve stem seal positioned between said valve stem and said bonnet, a second seal positioned between said bonnet cap and said bonnet, and a third seal positioned between said bonnet cap and said housing, wherein a sealed cavity exists above said first valve stem seal, said sealed cavity being defined by a portion of said bonnet cap, said first valve stem seal, said second seal and said third seal; and
an opening through said bonnet that allows said working fluid to enter said sealed cavity, thereby exerting a pressure of said working fluid in said sealed cavity above said valve stem seal. - View Dependent Claims (29, 30)
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31. A device, comprising:
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a body;
a valve stem operatively coupled to a gate positioned in said body;
a valve stem seal positioned around said valve stem, wherein a sealed cavity exists above said valve stem seal;
a piston chamber, said piston chamber being in fluid communication with said sealed cavity and an interior region of said body; and
a piston positioned in said piston chamber. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A device, comprising:
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a body;
a bonnet coupled to said body;
a valve stem operatively coupled to a gate positioned in said body;
a valve stem seal positioned between said valve stem and said bonnet, wherein a sealed cavity exists above said valve stem seal;
a piston chamber formed in said bonnet, said piston chamber being in fluid communication with said sealed cavity and an interior region of said body; and
a piston positioned in said piston chamber. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50, 51)
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52. A device, comprising:
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a body;
a bonnet coupled to said body;
a valve stem operatively coupled to a gate positioned in said body;
a bonnet cap coupled to said bonnet;
a roller screw assembly operatively coupled to said valve stem, said roller screw assembly comprising a housing, a portion of which extends through said bonnet cap;
a first valve stem seal positioned between said valve stem and said bonnet, a second seal positioned between said bonnet cap and said bonnet, and a third seal positioned between said bonnet cap and said housing, wherein a sealed cavity exists above said first valve stem seal, said sealed cavity being defined by a portion of said bonnet cap, said first valve stem seal, said second seal and said third seal;
a piston chamber formed in said bonnet, said piston chamber being in fluid communication with said sealed cavity and an interior region of said body; and
a piston positioned in said piston chamber. - View Dependent Claims (53, 54, 55, 56, 57, 58)
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59. A device adapted to have a working fluid flow therethrough, said device comprising:
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a body;
a bonnet coupled to said body;
a valve stem operatively coupled to a gate positioned in said body;
a valve stem seal positioned between said valve stem and said bonnet, wherein a sealed cavity exists above said valve stem seal; and
means for allowing a pressure of said working fluid to be exerted in said sealed cavity while preventing said working fluid from entering said sealed cavity. - View Dependent Claims (60, 61, 62, 63, 64, 65)
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Specification