Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent
1984-10-10
1986-01-07
Weakley, Harold W.
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
251167, 251172, 251328, 251368, 267 74, F16K 2500
Patent
active
045629927
ABSTRACT:
A seal device for a gate valve is disclosed, in which annular members facing the front and rear surfaces of a gate valve member having a through hole are coupled to a valve cage by inner and outer bellows, each of the annular members has an annular recess formed on the side facing the gate valve member and closed by an annular mirror surface finished thin plate secured by welding to an opening thereof, the individual bellows are elongated by fluid under pressure supplied into annular spaces defined by the inner and outer bellows, and the annular mirror surface finished thin plates are strongly urged against the gate valve member by the pressure of the fluid forced from the annular spaces into the annular recesses. Edge portions of the annular mirror surface finished thin plates are to be very firmly mounted to the annular members, and the mechanical strength of the thin plates is to be increased. The two annular mirror surface finished thin plates are to be simultaneously brought into contact with the front and rear surfaces of the gate valve member, and are to be urged against the gate valve member with a uniform pressure over the entire circumference.
REFERENCES:
patent: 1047491 (1912-12-01), Bliss
patent: 1788373 (1931-01-01), Anderson
patent: 3391901 (1968-07-01), Wheeler
patent: 3684239 (1972-08-01), Schwartzbart
patent: 3770009 (1973-11-01), Miller
patent: 4415139 (1983-11-01), Potts
Ishimaru Hajime
Onoda Mutsuro
Sugisaki Kenzaburo
Fuji Seiko Kabushiki Kaisha
Ishimaru Hajime
Oujevolk George B.
Weakley Harold W.
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