Valves and valve actuation – Rotary valves – Butterfly
Patent
1981-12-29
1983-08-16
Weakley, Harold W.
Valves and valve actuation
Rotary valves
Butterfly
251173, 251174, 137 72, 137 74, F16K 122
Patent
active
043986951
ABSTRACT:
A sealing structure for use in valves, including butterfly valves, having a body with a flow passage and a movable valve disc in the flow passage. Two sealing surfaces are mounted in the body to engage the disc when it is in a closed position to provide a bubble-tight seal. The sealing structure includes an annular seal retaining cavity with a slot opening to the flow passage. A metal seal ring having a lip portion (which has a first seat) projecting through the slot into the passage is contained within the cavity adjacent to a primary heat-destructible seal ring, which has a second seat. The first seat and the second seat are engageable with the sealing surface of the disc to provide two axial seals. When the valve is closed, a radially-directed force is developed at the second seat (on the heat-destructible seal) and at the first seat (on the lip portion of the metal seal) in response to contact with the disc to effect a heat-destructible seal and a second, metal-to-metal seal, respectively. In another embodiment, a C-ring, O-ring, or other suitable support means is used in place of the heat-destructible seal to hold the metal seal in position. In this embodiment the metal-to-metal seal is the sole sealing means.
REFERENCES:
patent: 4241895 (1980-12-01), Sternenberg
patent: 4244387 (1981-01-01), Snape
patent: 4272054 (1981-06-01), Zinnai
patent: 4373543 (1983-02-01), Brown
MCC Flowseal
Weakley Harold W.
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