Patent US4531710A successfully refreshed from Google Patents.
US4531710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expanding gate valve
Assignee: FIP SA de CV
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Filing: 1984-02-07
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Granted: 1985-07-30
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Expires: 2004-02-07
Abstract
Abstract There is disclosed an expanding gate valve having seats which are press-fitted into annular recesses in the valve body on opposite sides of the gate, each seat including a ring having at least one annular rib on its outer end which is of a harder material than that of the inner end of the recess and embedded therein to form a pressure barrier between the seat and recess.
Inventors
- 👤 Alejandro Tort O.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:42
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/16; F16K3/18; F16K3/184; F16K3/186; F16K3/0227; F16K3/0236
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
204 words
An expanding gate valve, comprising a body having a guideway therein and a flowway therethrough intersecting opposite sides of the guideway, a gate for reciprocation within the guideway to open and close the flowway, and including a pair of gate sections having wedge-shaped surfaces on their inner sides which are yieldably urged into conformity with one another but are slidable over one another to expand their outer sides as the gate moves into its opened and closed positions, a stem connected to one of the gate sections for so reciprocating it, and thus the other gate section carried by the one gate section, the flowway being radially enlarged at its intersection with each side of the guideway to provide annular recesses facing the guideway, and an annular seat mounted within each recess for sealing between the body and gate in both the opened and closed positions of the gate, each seat comprising a ring which has at least one annular rib on its outer end which is of a harder material than the oppositely facing inner end of the recess and which is press fitted into the recess so as to embed the end of the rib into the inner end of the recess.
Claim 2
Dependent Claim
204 words
An expanding gate valve, comprising a body having a guideway therein and a flowway therethrough intersecting opposite sides of the guideway, a gate for reciprocation within the guideway to open and close the flowway, and including a pair of gate sections having wedge-shaped surfaces on their inner sides which are yieldably urged into conformity with one another but are slidable over one another to expand their outer sides as the gate moves into its opened and closed positions, a stem connected to one of the gate sections for so reciprocating it, and thus the other gate section carried by the one gate section, the flowway being radially enlarged at its intersection with each side of the guideway to provide annular recesses facing the guideway, and an annular seat mounted within each recess for sealing between the body and gate in both the opened and closed positions of the gate, each seat comprising a ring which has at least one annular rib on its outer end which is of a harder material than the oppositely facing inner end of the recess and which is press fitted into the recess so as to embed the end of the rib into the inner end of the recess.
Claim 3
Dependent Claim
50 words
A valve of the character defined in claim 1, wherein the inner end of each seat ring has a radially outer face for engaging the oppositely facing outer side of the gate, and a radially inner relief having an outer diameter at least as great as that of the rib.
Claim 4
Dependent Claim
22 words
A valve of the character defined in claim 1, wherein the rib has inner and outer sides which taper toward one another.
Claim 5
Dependent Claim
29 words
A valve of the character defined in claim 1, wherein the seat ring has at least one additional rib formed on its outer end and surrounding the first-mentioned rib.
Claim 6
Dependent Claim
43 words
A seat for an expanding gate valve, comprising a ring of hard metal having a preformed, planar seating surface on one end and at least one annular rib on the other end which has inner and outer sides which taper toward one another.
Claim 7
Dependent Claim
43 words
A seat for an expanding gate valve, comprising a ring of hard metal having a preformed, planar seating surface on one end and at least one annular rib on the other end which has inner and outer sides which taper toward one another.
Claim 8
Dependent Claim
35 words
A seat of the character defined in claim 5, wherein the one end of the ring has a radially inner relief within the seating surface whose outer diameter is larger than that of the rib.
Claim 9
Dependent Claim
28 words
A seat of the character defined in claim 5, wherein the ring has at least one other annular rib formed on its other end about the first-mentioned rib.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |