Patent US6206967B1 successfully refreshed from Google Patents.
US3754567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ball lock control valve
Assignee: AIR DRY CORP
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Filing: 1972-05-30
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Granted: 1973-08-28
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Expires: 1992-05-30
Abstract
Abstract A control valve in which a valve seat is engaged by a closure member carried by a poppet. The poppet is mounted within a surrounding piston. A plurality of balls disposed around the periphery of the poppet engage larger circular openings in the piston to provide a limited amount of longitudinal movement of the poppet within the piston. A poppet return spring urges the closure member toward the valve seat. A strong pressure reference spring engages the piston, but its pressure is exerted against the valve body and not against the valve seat. Since the valve seat is not subjected to high pressure, it may be made narrow and sharp and only a small pressure differential is required to move the closure member from seating to sealing position.
Inventors
- 👤 D Whitten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:06
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/042; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7835; Y10T137/7837; Y10T137/7866; Y10T137/7867
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
159 words
A control valve comprising a valve body having an inlet and an outlet, a valve seat surrounding an opening controlling flow from said inlet to said outlet, a poppet having a closure member normally engaging said valve seat, said poppet being mounted for longitudinal movement with respect to a piston, a poppet return spring disposed between portions of said poppet and piston, said poppet return spring urging said poppet away from said piston toward said valve seat, a pressure reference spring acting upon said piston, said pressure reference spring urging said piston into engagement with said valve body, the entire pressure of said reference spring being exerted against said piston and valve body, the only pressure exerted against said valve seat being that of said poppet return spring, and means engageable between said piston and poppet whereby upward movement of said piston moves said poppet upwardly to lift said closure member off said valve seat and open said outlet.
Claim 2
Dependent Claim
159 words
A control valve comprising a valve body having an inlet and an outlet, a valve seat surrounding an opening controlling flow from said inlet to said outlet, a poppet having a closure member normally engaging said valve seat, said poppet being mounted for longitudinal movement with respect to a piston, a poppet return spring disposed between portions of said poppet and piston, said poppet return spring urging said poppet away from said piston toward said valve seat, a pressure reference spring acting upon said piston, said pressure reference spring urging said piston into engagement with said valve body, the entire pressure of said reference spring being exerted against said piston and valve body, the only pressure exerted against said valve seat being that of said poppet return spring, and means engageable between said piston and poppet whereby upward movement of said piston moves said poppet upwardly to lift said closure member off said valve seat and open said outlet.
Claim 3
Dependent Claim
43 words
The structure described in claim 1, the means engageable between said piston and poppet comprising at least one ball carried by one of said members, said ball being movably mounted in an opening of larger dimension formed in the other of said members.
Claim 4
Dependent Claim
27 words
The structure described in claim 2, and a plurality of balls carried by said poppet, said balls extending into openings of larger dimension formed on said piston.
Claim 5
Dependent Claim
22 words
The structure described in claim 3, said poppet carrying four balls equally spacEd from each other around the periphery of said poppet.
Claim 6
Dependent Claim
28 words
The structure described in claim 3, said piston being substantially cylindrical and hollow, said poppet being cylindrical and being reciprocally mounted within the hollow interior of said piston.
Claim 7
Dependent Claim
34 words
The structure described in claim 5, said poppet return spring being disposed within said piston and extending between the inside of the upper end of said piston and the upper portion of said poppet.
Claim 8
Dependent Claim
26 words
The structure described in claim 6, said piston having a substantially circular lower edge which engages the portion of said valve body surrounding said valve seat.
Claim 9
Dependent Claim
32 words
The structure described in claim 7, and an O-ring carried by said valve body and engaging the exterior of said piston to provide a moving seal between said piston and valve body.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |