Pressure balanced fluid control device

A device adapted to have a working fluid flow therethrough, said device comprising:

• a body;
• a bonnet coupled to said body;
• a valve stem operatively coupled to a gate positioned in said body, wherein said valve stem is operatively coupled to a roller screw;
• 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 formed in said bonnet that allows a pressure of said working fluid to be exerted in said sealed cavity above said valve stem seal.

A device, comprising:

• a body;
• a bonnet coupled to said body;
• a valve stem operatively coupled to a gate positioned in said body, wherein said valve stem is operatively coupled to a roller screw;
• 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 formed in said bonnet, said opening being in fluid communication with said sealed cavity and an interior region of said body.

A device adapted to have a working fluid flow theretbrough, said device comprising:

• a body;
• a bonnet coupled to said body;
• a valve stem operatively coupled to a gate positioned in said body, wherein said valve stem is operatively coupled to a roller screw;
• a valve stem seal positioned around said valve stem, wherein a sealed cavity exists above said valve stem seal;
• and
• an opening formed in said bonnet that allows a pressure of said working fluid to be exerted in said sealed cavity above said valve stem seal.

A device adapted to have a working fluid flow therethrough, said device comprising:

• a body;
• a bonnet coupled to said body;
• a valve stem operatively coupled to a gate positioned in said body, wherein said valve stem is operatively coupled to a roller screw;
• 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 formed in 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.

A device adapted to have a working fluid flow therethrough, said device comprising:

• 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.

A device adapted to have a working fluid flow therethrough, said device comprising:

• a body;
• a solid valve stem having a first end operatively coupled to a gate positioned in said body and a second end opposite said first end, said second end of said valve stem having an end face;
• a valve stem seal positioned around said solid valve stem, wherein a sealed cavity exists above said valve stem seal and said end face of said second end of said valve stem;
• 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 on an entirety of said end face of said second end of said valve stem.

A device adapted to have a working fluid flow therethrough, said device comprising:

• a body;
• a bonnet coupled to said body;
• a valve stem having a first end operatively coupled to a gate positioned in said body and a second end opposite said first end, said second end of said valve stem having an end face;
• a valve stem seal positioned between said valve stem and said bonnet, wherein a sealed cavity exists above said valve stem seal and said end face of said second end of said valve stem;
• and
• an opening formed in said bonnet that allows a pressure of said working fluid to be exerted in said sealed cavity on an entirety of said end face of said second end of said valve stem.

A device adapted to have a working fluid flow therethrough, said device comprising:

• a body;
• a valve stem having a first end operatively coupled to a gate positioned in said body and a second end opposite said first end, said second end of said valve stem having an end face;
• a valve stem seal positioned around said valve stem, wherein a sealed cavity exists above said valve stem seal and said end face of said second end of said valve stem;
• and
• an opening formed in said body that allows a pressure of said working fluid to be exerted in said sealed cavity on an entirety of said end face of said second end of said valve stem.