Title: Floating seat structure for gate valves

Abstract: A floating seat ring for a gate valve structure has an external pressure source to move the seat ring into engagement with the gate valve. A pocket for the seat ring is formed by a counterbore in the valve body and a tubular insert is inserted within the valve body bore extending within the seat ring. This inner end portion of the tubular insert defines with the counterbore the pocket for the seat ring for floating back and forth movement. An external pressure source is in fluid communication with the pocket behind the seat ring to move the seat ring outwardly.

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Inventors: Bond, John A. (Houston, TX, US)

Application Number: 840868
Filing Date: 1977-10-11
Publication_date: 1979-01-30
Assignee: ACF Industries, Incorporated (New York, NY)
Primary Class(es): 137/375 137/246.22, 251/172, 251/196
Other Classes:
US Patent Ref:

2591038	Apr, 1952	Allen	251/328.
2616655	Nov, 1952	Hamer	251/328.
3367625	Feb, 1968	Fortune	251/172.
3405911	Oct, 1968	Bolling	251/172.
3610569	Oct, 1971	Reaves	251/172.
3929316	Dec, 1975	Guthrie	251/328.

Other Refs: 921214

Mar, 1963	GB

Primary Examiner: Weakley, Harold W.
Assistant Examiner:
Attorney: Riddle; Eugene N.