Double Block and Bleed Sandwich-Type Valve
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United States of America Patent
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N/A
Issued Date -
Oct 6, 2011
app pub date -
Apr 1, 2010
filing date -
Apr 1, 2010
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An improved sandwich-type valve made according to this invention has two seals that move and seal independent of one another. The first seal is located on the upper surface of the valve member or disc and moves with the valve disc toward and away from the upper plate in response to fluid pressure. The second seal is a floating seal that is received by a seat of the lower plate portion of the valve body. The second seal moves toward and away from the lower plate in response to fluid pressure. A bleed port may be provided in the spacer flange between the first and second seal.
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