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Title: Radial-directed fluid-pressure-loaded all-metal-sealed gate valve

A large diameter gate valve uses a radially directed fluid pressure loaded all metal seal formed by engaging and disengaging a fixed and a moveable seal element. The fixed element is formed of a circular flange which contains a pressure chamber with a deformable wall, and is mounted to the valve body. The moving seal element contains an annular recess which mates with the circular flange, and is carried on a moveable sub-frame which moves on a frame fixed in the valve body. The valve opening defines an axis in a first direction, and the sub-frame moves through the valve body in a second direction which is substantially perpendicular to the first direction. The sub-frame and moveable seal element move in the second direction until the moveable element reaches a stop mounted in the valve body at which position the moveable element is aligned with but spaced apart from the fixed element. As the sub-frame continues to move in the second direction, the moveable element is forced to move toward and engage the fixed element. The pressure chamber in the flange is then pressurized to complete the seal.
  1. (Livermore, CA)
Issue Date:
OSTI Identifier:
Batzer Vacuum Technology Associates, Inc. (Livermore, CA) LLNL
Patent Number(s):
US 5083748
Contract Number:
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
radial-directed; fluid-pressure-loaded; all-metal-sealed; gate; valve; diameter; radially; directed; fluid; pressure; loaded; metal; seal; formed; engaging; disengaging; fixed; moveable; element; circular; flange; contains; chamber; deformable; wall; mounted; moving; annular; recess; mates; carried; sub-frame; moves; frame; defines; axis; direction; substantially; perpendicular; move; reaches; stop; position; aligned; spaced; apart; continues; forced; engage; pressurized; complete; annular recess; substantially perpendicular; pressure chamber; spaced apart; fluid pressure; seal element; metal seal; gate valve; radially directed; seal formed; deformable wall; top mounted; frame moves; moving seal; seal form; /251/