US3640306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure relief valve
Assignee: Bobrick Aero Missile Products
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Filing: 1970-10-19
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Granted: 1972-02-08
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Expires: 1990-10-19
Abstract
Abstract A multiflapper relief valve wherein individual flapper valve members are sector shaped laying in a common plane and rotatable through an arc from the closed or seated position to the open position and wherein each of the flapper valve members are provided with a cricket spring of the leaf-type to preload them to a selected value, which value must be overcome by fluid in the system in which the relief valve is used in order to unseat the valve members. When the fluid pressure in the system is greater than the cracking pressure, unseating occurs and the cricket spring thereafter exerts a substantially insignificant, lower force in comparison once the flapper valve member is moved off of its seat and imparts a snap opening and closing action to each of the sector-shaped valve members.
Inventors
- 👤 Clarence L Vogt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:33
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; F16K15/035; F16K17/00; F16K17/02; F16K17/04; F16K17/044; F16K2200/00; F16K2200/20; F16K2200/203; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839; Y10T137/7898; Y10T137/7904; Y10T137/7905
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
101 words
In a pressure relief valve of the flapper type, wherein said flapper is pivotally mounted and movable through an arc from a closed and seated position to an open position, the improvement which comprises: the combination of said flapper and spring means to exert a substantially high force on said flapper during the movement thereof through a finite arc segment proximate the closed position thereof and a relatively low, in comparison constant force during the remainder of the arc of movement thereof and to effect a snap closing and opening action of said flapper when moved through said finite arc segment.
Claim 2
Dependent Claim
101 words
In a pressure relief valve of the flapper type, wherein said flapper is pivotally mounted and movable through an arc from a closed and seated position to an open position, the improvement which comprises: the combination of said flapper and spring means to exert a substantially high force on said flapper during the movement thereof through a finite arc segment proximate the closed position thereof and a relatively low, in comparison constant force during the remainder of the arc of movement thereof and to effect a snap closing and opening action of said flapper when moved through said finite arc segment.
Claim 3
Dependent Claim
23 words
The improvement in accordance with claim 1 wherein said spring means is deflectable through the transverse axis thereof to obtain said snap action.
Claim 4
Dependent Claim
26 words
The improvement in accordance with claim 2 wherein said spring means is a strip of spring metal of relatively small thickness sufficient to permit flexing thereof.
Claim 5
Dependent Claim
18 words
The improvement in accordance with claim 3 wherein said strip is of arcuate configuration in transverse cross section.
Claim 6
Dependent Claim
26 words
The improvement in accordance with claim 4 wherein said strip is trapezoidallike in shape and is supported cantilever fashion from the secured end of said flapper.
Claim 7
Dependent Claim
29 words
The improvement in accordance with claim 4 which additionally includes a torsion spring, one end of which acts upon the extremity of said strip opposite the secured end thereof.
Claim 8
Dependent Claim
34 words
The improvement in accordance with claim 6 which additionally includes a flapper contact member which is secured to said extremity of said strip and which transmits the force of said spring to said flapper.
Claim 9
Dependent Claim
25 words
The improvement in accordance with claim 7 wherein said flapper contact member is secured to said strip by said one end of said torsion spring.
Claim 10
Dependent Claim
29 words
The improvement in accordance with claim 8 which includes additional spring steel strips of like size and configuration as said spring means and mounted therewith in spring leaf fashion.
Claim 11
Dependent Claim
31 words
The improvement in accordance with claim 9 wherein said flapper is sector shape and a plurality of said flappers of pie-shaped configuration are disposed in coplanar relationship onto coplanar seating surfaces.
Claim 12
Dependent Claim
147 words
A multiflapper valve comprising an annular flapper support and seat member adapted to be received in a fluid conduit and being divided by intersecting seating bars into a plurality of sectors to form a plurality of valve seats, corresponding in number to said sectors; a flapper valve member pivotally mounted to said support and seat member in each of said sectors and being movable through an arc segment from a closed seating position with said valve seat to an open nonseating position; a cantilever supported spring member supported on each of said flapper valve members, said spring meMber being a flexible leaf capable of deflection in a direction substantially transverse to the longitudinal axis thereof to exert a substantially high force on said flapper valve member in the seated position and a relatively low, in comparison, force when said flapper valve member is in the unseated position.
Claim 13
Dependent Claim
147 words
A multiflapper valve comprising an annular flapper support and seat member adapted to be received in a fluid conduit and being divided by intersecting seating bars into a plurality of sectors to form a plurality of valve seats, corresponding in number to said sectors; a flapper valve member pivotally mounted to said support and seat member in each of said sectors and being movable through an arc segment from a closed seating position with said valve seat to an open nonseating position; a cantilever supported spring member supported on each of said flapper valve members, said spring meMber being a flexible leaf capable of deflection in a direction substantially transverse to the longitudinal axis thereof to exert a substantially high force on said flapper valve member in the seated position and a relatively low, in comparison, force when said flapper valve member is in the unseated position.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |