US3744751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve
Assignee: Milwaukee Valve Co Inc
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Filing: 1971-10-21
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Granted: 1973-07-10
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Expires: 1991-10-21
Abstract
Abstract Flow from the inlet to the outlet of the valve is controlled by a spring-loaded check valve cooperating with a seat. The check valve has an annular valve face (made from a temperatureresistant, abrasion-resistant material and carried in a recess in a holder) and a stem guided in a bore provided in an adjustable spindle. The bottom end of the spindle acts as a stop limiting the valve travel upon opening. The opening travel of the check valve can be varied by adjusting the spindle position and flow can be shut off completely by bottoming the spindle against the check valve so it cannot open. A bellows surrounding the spring and spincle isolates the spring and stem guide from the flow system, thereby preventing excessive wear and gumming caused by the presence of the dry bulk material (when used in this type service) and other system contaminants in the moving parts of the valve. The stem guide is vented to the atmosphere to prevent a dash pot effect when the check valve opens.
Inventors
- 👤 D Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:45
CPC Classifications
F; F16; F16K; F16K41/00; F16K41/10; F16K17/00; F16K17/02; F16K17/04; F16K17/042; Y; Y10; Y10T; Y10T137/00; Y10T137/598; Y10T137/6161; Y10T137/6164; Y10T137/6181; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
226 words
A check valve adaptable for use in systems handling dry bulk materials comprising a body having an inlet and outlet; a valve seat in said body; a check valve member including an annular recess for receiving an annular, flat-surfaced valve ring which cooperates with said seat to control flow of material from said inlet to said outlet; a stem connected to and extending from said valve member; a spindle threaded into said valve body for adjustable movement therein and including a guide in which said stem is slidably mounted and a bottom which acts as a stop for limiting the opening travel of said valve member; means for adjusting the position of said spindle to vary the opening travel of said valve member; a spring surrounding said spindle and positioned between said body and said valve to urge said valve ring against said valve seat; a resilient sealing member surrounding said spindle and said spring and sealingly connected at the opposite ends to said body and said valve member to thereby isolate said spring and said guide from material flowing from said inlet to said outlet; and a vent port in said spindle communicating with said guide and the threaded connection between said spindle and said body, said threaded connection having sufficient clearance to provide a circuitous vent passage from said vent port to the atmosphere.
Claim 2
Dependent Claim
226 words
A check valve adaptable for use in systems handling dry bulk materials comprising a body having an inlet and outlet; a valve seat in said body; a check valve member including an annular recess for receiving an annular, flat-surfaced valve ring which cooperates with said seat to control flow of material from said inlet to said outlet; a stem connected to and extending from said valve member; a spindle threaded into said valve body for adjustable movement therein and including a guide in which said stem is slidably mounted and a bottom which acts as a stop for limiting the opening travel of said valve member; means for adjusting the position of said spindle to vary the opening travel of said valve member; a spring surrounding said spindle and positioned between said body and said valve to urge said valve ring against said valve seat; a resilient sealing member surrounding said spindle and said spring and sealingly connected at the opposite ends to said body and said valve member to thereby isolate said spring and said guide from material flowing from said inlet to said outlet; and a vent port in said spindle communicating with said guide and the threaded connection between said spindle and said body, said threaded connection having sufficient clearance to provide a circuitous vent passage from said vent port to the atmosphere.
Claim 3
Dependent Claim
56 words
A check valve according to claim 1 wherein said valve ring is made from a cold-flowable, heat-resistant, abrasion-resistant material; and said stem includes a flange connected to the bottom and thereof, said flange bearing against a non-seating portion of said valve ring and cooperating with said recess to constrain said valve ring against substantial cold flow.
Claim 4
Dependent Claim
12 words
A check valve according to claim 2 wherein said material is Teflon.
Claim 5
Dependent Claim
48 words
A check valve according to claim 2 wherein said resilient member is made from a heat-resistant, elastomeric material, is generally cylindrically shaped, and includes an integral inwardly extending circumferential ring at each end which sealingly fits into respective complementary grooves provided in said body and said valve member.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |