Fluid handling – Removable valve head and seat unit – Retained by bonnet or closure
Patent
1983-11-16
1988-09-20
Schwadron, Martin P.
Fluid handling
Removable valve head and seat unit
Retained by bonnet or closure
251327, 251328, 277166, 277183, F16K 2500, F16K 302
Patent
active
047718056
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In order to minimize maintenance and provide satisfactory operation over extended periods for high pressure valves as well as valves used in particular environments and/or with particular fluids, it is desirable to utilize metal-to-metal sealing rather than an elastomer or the like. It is further desirable that valves operated in high pressures or other severe environments be relatively easy to repair and be of a so-called unitized construction so that the interior parts of the vavle can be removed as a unit for easy replacement and/or repair.
BRIEF DESCRIPTION OF THE INVENTION
The present invention provides a gate valve that utilizes metallic sealing and is of unitized construction. The valve includes a valve body that has the usual through passage for the fluid that is to be controlled and has a bore for receiving the internal portions of the valve with this bore intersecting and traversing the through passage. The portion of the bore adjacent to the through passage is conical and there is received in this conical region a seat carrier. This seat carrier has a through passage in alignment with that of the housing bore. A seal is provided between the seat carrier and the body by means of an annular metallic seal member generally coaxial of these through passages and positioned at each end of the through passage in the seat carrier. The seat carrier is forced into its proper position in the valve body by means of assembling the valve and particularly the bolting down of the valve bonnet. This action squeezes the seal members or, in other words, energizes them into sealing position. When thus energized, the seal members maintain the conical surfaces of the seat carrier and the valve body in spaced relation. The action of forcing the seat carrier into position in the valve body causes compression of the seat carrier (deformation within the elastic limit) and tensioning of the valve body (deformation within the elastic limit) the result of which is to provide a resilient bias urging the seal member into sealing position notwithstanding expansion and contraction of these valve parts due to temperature and pressure variations.
The gate is loosely received within a suitable rectangular recess extending through the seat carrier and a seat arrangement is provided between the gate and the seat carrier so as to provide a metal-to-metal seal through the action of the controlled fluid against the gate.
The valve assembly is such that upon removal of the valve bonnet from the valve body, the entire internal valve assembly is removed as a unit.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a view partially insection of the gate valve of the invention with the gate in the closed position;
FIG. 2 is a similar view with the gate in the open position;
FIG. 3 is an exploded view of the gate valve of the invention;
FIG. 4 is a perspective view of the seal loading spacers that form a part of the valve;
FIG. 5 is a view of the gate with a phanthom view of the spacers as they are positioned relative to the gate in the valve;
FIG. 6 is a perspective view of the seat carrier and one of the metallic seal rings;
FIG. 7 is an enlarged section of the gate and the seat carrier with the gate in the closed position;
FIG. 8a is a sectional view of the ring taken along line 8--8 of FIG. 6; and
FIGS. 8b, 8c, and 8d are views similar to FIG. 8a by showing modified seal ring constructions.
FIG. 9 is an enlarged fragmentary sectional view of seal ring in position and energized.
FIG. 10 is a perspective view of another preferred embodiment of the seat carrier and one of the metallic seal rings.
FIG. 11 is an enlarged fragmentary sectional view of the seat carrier of FIG. 10 with the carrier forced down into its operative position in the valve body and with the seal ring energized.
FIG. 12 is an elevational view of still another preferred embodiment of seat carrier having a metallic sleeve insert to prevent inward distortion of the seal ring.
FIG. 13 is a sectional view taken from line 13--13 of FIG. 12.
FIG. 14
REFERENCES:
patent: 2173381 (1939-09-01), Waddell
patent: 2997057 (1961-08-01), Toth
patent: 3000393 (1961-09-01), Maynard
patent: 3006601 (1961-10-01), Anderson
patent: 3387817 (1968-06-01), Seguenot
patent: 3548875 (1970-12-01), Lagarelli
patent: 3656501 (1972-04-01), Buchta
patent: 3658087 (1972-04-01), Nelson
patent: 3671010 (1972-06-01), Scaramucci
patent: 3698418 (1972-10-01), Schmitt
patent: 3843141 (1974-10-01), Kohn
patent: 3989285 (1976-11-01), Yancey
patent: 4203608 (1980-05-01), Nicholson
Dwyer Joseph R.
Schwadron Martin P.
Vetco Gray Inc.
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