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Half profile gate valve

  • US 5,884,899 A
  • Filed: 07/14/1997
  • Issued: 03/23/1999
  • Est. Priority Date: 07/14/1997
  • Status: Expired due to Fees
First Claim
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1. A gate valve for creating a vacuum tight seal to a vacuum chamber, comprisinga valve housing defining a valve chamber, the valve chamber having an opening therein for providing access to the vacuum chamber,a valve plate movable within the valve chamber from a first, open position away from the opening to a second, closed position wherein the valve plate closes the opening to the vacuum chamber,an actuator assembly including a movable piston component that is connected at one end to the valve plate and a cylinder component connected to the valve housing, the piston component and the cylinder component defining first and second working chambers for moving the piston component a travel distance,a bellows shield extending between the piston component and the valve housing for isolating the second working chamber from the valve chamber,the piston and cylinder components defining bellows isolating structure that isolates the bellows shield from the working pressure of the second working chamber, the bellows isolating structure extending along at least a portion of the bellows shield, the bellows isolating structure and bellows shield being positioned within the actuator assembly and out of the valve chamber.

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