Patent US3677288A successfully refreshed from Google Patents.
US3677288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow control valve
Assignee: Micropump Inc
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Filing: 1970-10-08
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Granted: 1972-07-18
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Expires: 1990-10-08
Abstract
Abstract A structure is provided for use in a globe valve or the like in installations where constant flow is desired despite variations in inlet and outlet pressures. The valve stem is attached to the structure and movement of the stem determines the effective maximum flow through the valve. Inlet and outlet pressures operate upon opposite sides of a diaphragm, and the differential in pressure causes movement of a valve member relative to an orifice and thereby maintains constant flow through said orifice.
Inventors
- 👤 Thomas B Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:53
CPC Classifications
G; G05; G05D; G05D7/00; G05D7/01; G05D7/0126; F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7787; Y10T137/7788
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
308 words
A valve of the character described comprising a housing, a first partitiOn dividing the interior of said housing into inlet and outlet compartments, said first partition forming a cylindrical valve body having an end wall formed with a first orifice opening into said inlet compartment, a movable valve stem, means external of said housing for moving said valve stem toward and away from said first orifice, a hollow valve structure reciprocal within said valve body having an external first seal ring between said valve structure and said valve body and a first valve element in proximity to said first orifice, means connecting said stem to said valve structure to position said first valve element in relation to said first orifice, a movable second partition within said valve structure, having a second seal ring between said second partition and the interior of said valve structure dividing the interior of said valve structure into first and second chambers, a first passage for fluid communication between said first chamber and said inlet compartment through said first orifice, a second passage for fluid communication between said first orifice and said second chamber, a second orifice for fluid communication between said second chamber and said outlet compartment, whereby fluid flow from said first orifice passes through said second passage, then inside said second chamber, then out said second orifice and into said outlet compartment, a second valve element movable with said second partition and cooperable with said second orifice to adjust the pressure drop across said second orifice, and resilient means biasing said second valve element away from said second orifice, whereby the pressure of fluid flowing in said second chamber will be less than the pressure in said second chamber will be less than the pressure in said first chamber by an amount which is limited by the deflection of said spring.
Claim 2
Dependent Claim
308 words
A valve of the character described comprising a housing, a first partitiOn dividing the interior of said housing into inlet and outlet compartments, said first partition forming a cylindrical valve body having an end wall formed with a first orifice opening into said inlet compartment, a movable valve stem, means external of said housing for moving said valve stem toward and away from said first orifice, a hollow valve structure reciprocal within said valve body having an external first seal ring between said valve structure and said valve body and a first valve element in proximity to said first orifice, means connecting said stem to said valve structure to position said first valve element in relation to said first orifice, a movable second partition within said valve structure, having a second seal ring between said second partition and the interior of said valve structure dividing the interior of said valve structure into first and second chambers, a first passage for fluid communication between said first chamber and said inlet compartment through said first orifice, a second passage for fluid communication between said first orifice and said second chamber, a second orifice for fluid communication between said second chamber and said outlet compartment, whereby fluid flow from said first orifice passes through said second passage, then inside said second chamber, then out said second orifice and into said outlet compartment, a second valve element movable with said second partition and cooperable with said second orifice to adjust the pressure drop across said second orifice, and resilient means biasing said second valve element away from said second orifice, whereby the pressure of fluid flowing in said second chamber will be less than the pressure in said second chamber will be less than the pressure in said first chamber by an amount which is limited by the deflection of said spring.
Claim 3
Dependent Claim
86 words
A valve according to claim 1 in which part of said valve structure is dimensioned smaller than the interior of said cylindrical valve body, said valve structure formed with at least one opening leading into said second chamber and located on the side of said first seal ring toward said end wall, whereby fluid flow from said first orifice passes inside said valve body around the outside of said valve structure, then inside said second chamber, then out said second orifice and into said outlet compartment.
Claim 4
Dependent Claim
19 words
A valve according to claim 1 in which said movable second partition is in the form of a diaphragm.
Claim 5
Dependent Claim
109 words
A valve according to claim 3 in which said valve structure is formed with a hollow first portion formed with an internal first shoulder, and an internal second shoulder, an orifice plate defining said second orifice received against said first shoulder, said spring forcing said orifice plate against said first shoulder, said second valve member cooperating with the opposite end of said spring to bias said diaphragm away from said second orifice, a second valve structure portion securing the periphery of said diaphragm, means for holding said first and second portions of said valve structure in assembled position, said first passage consisting of an opening in said second portion.
Claim 6
Dependent Claim
45 words
A valve according to claim 11 in which said end wall is formed with an internal seat and in which said first valve element comprises an annular seal ring surrounding said first orifice and cooperable with said seat to meter fluid flow through said valve.
Claim 7
Dependent Claim
39 words
A valve according to claim 1 in which said first valve element consists of a tapering tip cooperable with said first orifice to meter fluid flow through said valve, said first passage comprising a central duct in said tip.
Claim 8
Dependent Claim
86 words
A valve according to claim 1 in which said valve structure is formed with an internal cylinder on the upstream side of said second orifice in alignment with said second orifice, said second valve element being formed with a shoulder portion cooperable with said second orifice to adjust the pressure drop across said second orifice, said second valve element also having a piston portion Reciprocable within said cylinder and formed with ducts to establish fluid communication between the inside of said cylinder and said second chamber.
Claim 9
Dependent Claim
26 words
A valve according to claim 7 which further comprises a filter enclosing said ducts to prevent ingress of foreign matter into said ducts and said cylinder.
Claim 10
Dependent Claim
70 words
A valve according to claim 1 in which said movable valve stem is formed with a constructed thickness spaced slightly outward from its inner end, said valve structure having a flange formed with a slot extending from the periphery of said flange, said constricted thickness received within said slot with wider portions of said stem both above and below said flange for mechanically connecting said stem to said valve structure.
References Cited (Backward Citations)
US2623331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |