Patent US3912221A successfully refreshed from Google Patents.
US3912221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stem seal and retainer for gate valve
Assignee: United States Pipe and Foundry Co LLC
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Filing: 1974-06-26
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Granted: 1975-10-14
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Expires: 1994-06-26
Abstract
Abstract A gate valve of the non-rising stem type comprising a stem collar is located inside the bonnet section thus requiring no seal plate or seal plate bolts. A cartridge type seal unit is held in place by the operating nut and the stem and gates are held in the up position by a snap ring.
Inventors
- 👤 Abraham S Fenster
- 👤 Fred W Salloga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:08
CPC Classifications
F; F16; F16K; F16K41/00; F16K41/02; F16K41/023; F16K3/00; F16K3/02; F16K31/00; F16K31/44; F16K31/50; F16K31/508; Y; Y10; Y10S; Y10S277/00; Y10S277/91
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
215 words
In combination with a non-rising stem gate valve of the type comprising a body portion with flow openings, a bonnet portion attached to said body portion in fluid-tight relationship thereto, means for opening and closing said flow openings, said means including a stem extending through a tubular opening in said bonnet, the improvement comprising a stem seal shoulder on an inner surface of said bonnet surrounding said tubular opening, a collar surrounding an intermediate portion of said stem and being of greater diameter than said tubular opening to prevent said stem from movement outwardly with respect to said bonnet, an upper shoulder on said bonnet surrounding said tubular opening exteriorly of said bonnet, means, entirely within said tubular opening, connecting said stem and said upper shoulder to prevent said stem from moving inwardly with respect to said bonnet and a slip fitting seal cartridge surrounding said stem and resting on said upper shoulder, said cartridge having an annular notch, a first ''''O'''' ring seal inserted in said notch, and being radially compressed between said seal cartridge and said bonnet portion, said stem having an annular groove therein, and a second ''''O'''' ring seal inserted in said groove and being radially compressed between said stem and said seal cartridge to prevent fluid leakage along said stem.
Claim 2
Dependent Claim
215 words
In combination with a non-rising stem gate valve of the type comprising a body portion with flow openings, a bonnet portion attached to said body portion in fluid-tight relationship thereto, means for opening and closing said flow openings, said means including a stem extending through a tubular opening in said bonnet, the improvement comprising a stem seal shoulder on an inner surface of said bonnet surrounding said tubular opening, a collar surrounding an intermediate portion of said stem and being of greater diameter than said tubular opening to prevent said stem from movement outwardly with respect to said bonnet, an upper shoulder on said bonnet surrounding said tubular opening exteriorly of said bonnet, means, entirely within said tubular opening, connecting said stem and said upper shoulder to prevent said stem from moving inwardly with respect to said bonnet and a slip fitting seal cartridge surrounding said stem and resting on said upper shoulder, said cartridge having an annular notch, a first ''''O'''' ring seal inserted in said notch, and being radially compressed between said seal cartridge and said bonnet portion, said stem having an annular groove therein, and a second ''''O'''' ring seal inserted in said groove and being radially compressed between said stem and said seal cartridge to prevent fluid leakage along said stem.
Claim 3
Dependent Claim
26 words
A non-rising stem gate valve as recited in claim 1 in which said means connecting said stem and said upper shoulder is a detachable retainer ring.
Claim 4
Dependent Claim
37 words
A non-rising stem gate valve as recited in claim 1 in which an operating means is secured to the upper end of said stem and said seal cartridge is interposed between said operating means and said bonnet.
Claim 5
Dependent Claim
24 words
A non-rising stem gate valve as recited in claim 1 in which a seal is compressed between said operating means and said seal cartridge.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |