US3626977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination check and pressure relief valve
Assignee: CIRCLE SEAL CORP
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Filing: 1970-01-21
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Granted: 1971-12-14
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Expires: 1990-01-21
Abstract
Abstract A combination check and pressure relief valve utilizing a lightweight poppet valve member held closed by a calibrated spring and supplemented by a floating self-aligning resilient Oring seal held against dilation by an encircling channel-shaped retainer ring. The poppet and O-ring units are held captive in a one-piece cage permanently assembled between the surrounding valve housing components by welded seams, the cage being contoured to provide separate stops for the poppet and for the Oring retainer unit.
Inventors
- 👤 James H Riley
- 👤 Mathias Plotkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:23
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/025; F16K15/026; F16K15/028; F16K17/00; F16K17/02; F16K17/04; F16K17/0413; F16K2200/00; F16K2200/30; F16K2200/303; Y; Y10; Y10S; Y10S251/00; Y10S251/90; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7866; Y10T137/7904; Y10T137/7922; Y10T137/7923; Y10T137/7929; Y10T137/7937
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
175 words
In combination, fluid flow control means comprising a valve housing having a fluid flow passage and valve seat means concentrically thereof, valve means movable toward and away from said valve seat means, said valve seat means including a resilient O-ring encircling said flow passage and an annular valve seat, the outer periphery of said O-ring being closely embraced and confined within an inwardly facing annular groove formed in a continuous floating retainer ring effective to restrain said O-ring against radial expansion and distortion, means for holding said retainer ring and O-ring captive with limited freedom of movement radially and axially of said annular valve seat but in close proximity thereto, and said O-ring being sized to have simultaneous sealing engagement on one inner axial surface thereof with said valve means and on the opposite inner axial surface thereof with said valve housing in close proximity to said annular valve seat when said valve means is seated against said annular valve seat thereby to supplement and augment the sealing effectiveness of said fluid flow control means.
Claim 2
Dependent Claim
175 words
In combination, fluid flow control means comprising a valve housing having a fluid flow passage and valve seat means concentrically thereof, valve means movable toward and away from said valve seat means, said valve seat means including a resilient O-ring encircling said flow passage and an annular valve seat, the outer periphery of said O-ring being closely embraced and confined within an inwardly facing annular groove formed in a continuous floating retainer ring effective to restrain said O-ring against radial expansion and distortion, means for holding said retainer ring and O-ring captive with limited freedom of movement radially and axially of said annular valve seat but in close proximity thereto, and said O-ring being sized to have simultaneous sealing engagement on one inner axial surface thereof with said valve means and on the opposite inner axial surface thereof with said valve housing in close proximity to said annular valve seat when said valve means is seated against said annular valve seat thereby to supplement and augment the sealing effectiveness of said fluid flow control means.
Claim 3
Dependent Claim
25 words
The combination defined in claim 1 characterized in that said valve seat means and said valve means are metallic and said resilient O-ring is nonmetallic.
Claim 4
Dependent Claim
81 words
The combination defined in claim 1 characterized in that said valve seat is relieved on the exterior thereof and so shaped relative to adjacent surface of said valve means in the closed position of said valve means as to form an annular chamber radially outward of said valve seat means having outwardly flaring side walls positioned to have continuous ring contact with the juxtaposed axial faces of said O-ring and cooperating to place the I.D. of said O-ring in hoop tension.
Claim 5
Dependent Claim
45 words
The combination defined in claim 3 characterized in that said valve means comprises rigid disc means of substantially greater diameter than the seat proper of said valve seat means, and spring means urging said disc means toward seated position relative to said valve seat means.
Claim 6
Dependent Claim
35 words
The combination defined in claim 4 characterized in that said rigid disc means has a generally convex surface facing toward said valve seat means an an axially flanged rim projecting away from said convex surface.
Claim 7
Dependent Claim
69 words
The combination defined in claim 4 characterized in that said means for holding said retainer ring and said O-ring captive with limited freedom of movement comprises nonmetallic generally tubular cage means surrounding said retaineR ring, said valve means and the spring means therefore; said cage means including stop means for limiting axial movement of said retainer ring and other stop means for limiting opening movement of said valve means.
Claim 8
Dependent Claim
51 words
The combination defined in claim 6 characterized in that said valve housing comprises at least one tubular end fitting formed with said valve seat, and a tubular main body fitting closely encircling said tubular cage means and cooperating with said end fitting to hold said cage means assembled without end play.
Claim 9
Dependent Claim
19 words
The combination defined in claim 7 characterized in that the parts of said valve housing are permanently welded together.
Claim 10
Dependent Claim
26 words
The combination defined in claim 7 characterized in that said valve housing comprises a pair of end fittings and an intervening sleeve all permanently welded together.
Claim 11
Dependent Claim
44 words
The combination defined in claim 1 characterized in that said holding means for said O-ring retainer ring is effective to hold said retainer ring loosely adjacent and encircling said valve seat while said valve means is unseated and axially removed from said valve seat.
Claim 12
Dependent Claim
36 words
The combination defined in claim 6 characterized in that said valve disc means is effective in cooperation with said cage means to restrict fluid flow to a path out of contact with said compression spring means.
Claim 13
Dependent Claim
181 words
A pressure relief valve for use in the precise control of fluid pressure in excess of 25 p.s.i., said relief valve comprising a housing having a valve seat, valve means normally held seated on said valve seat by calibrated spring means, said valve means being larger in diameter than said valve seat and having the valve seat contacting surfaces thereof flaring outwardly away from said valve seat, the exterior surfaces of said valve seat being relieved and flaring outwardly away from the flaring portion of said valve means, an O-ring encircling said valve seat with the opposite faces thereof positioned to have sealing contact with the aforesaid oppositely flaring surfaces when said valve means is engaged with said valve seat, and a rigid retainer ring encircling said O-ring and in continuous contact with the O.D. and the adjacent portions of the opposite faces thereof to restrain the same against radial and circumferential expansion thereof whereby the area of said valve subject to fluid pressure is fixed with the result that cracking of said relief valve is governed by said calibrated spring.
Claim 14
Dependent Claim
181 words
A pressure relief valve for use in the precise control of fluid pressure in excess of 25 p.s.i., said relief valve comprising a housing having a valve seat, valve means normally held seated on said valve seat by calibrated spring means, said valve means being larger in diameter than said valve seat and having the valve seat contacting surfaces thereof flaring outwardly away from said valve seat, the exterior surfaces of said valve seat being relieved and flaring outwardly away from the flaring portion of said valve means, an O-ring encircling said valve seat with the opposite faces thereof positioned to have sealing contact with the aforesaid oppositely flaring surfaces when said valve means is engaged with said valve seat, and a rigid retainer ring encircling said O-ring and in continuous contact with the O.D. and the adjacent portions of the opposite faces thereof to restrain the same against radial and circumferential expansion thereof whereby the area of said valve subject to fluid pressure is fixed with the result that cracking of said relief valve is governed by said calibrated spring.
Claim 15
Dependent Claim
42 words
A pressure relief valve as defined in claim 12 characterized in that said relief valve includes means for holding said retainer ring and the O-ring therein captive with limited freedom to move as a unit radially and axially of said valve seat.
Claim 16
Dependent Claim
48 words
A pressure relief valve as defined in claim 13 characterized in that said relief valve includes a molded plastic retainer cage having annular shoulders about the interior thereof providing stop abutments respectively for said calibrated spring, for said valve and for said retainer ring and the O-ring therein.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |