Patent US3648733A successfully refreshed from Google Patents.
US3648733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spool valve having adjustable seals
Assignee: SPENCER HYDRAULIC Inc
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Filing: 1970-01-22
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Granted: 1972-03-14
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Expires: 1990-01-22
Abstract
Abstract A fluid flow control device including a housing having an inlet port and an outlet port and an intermediate chamber. A spool is slidably disposed in the chamber, and fluid seal rings are located in the chamber for fluid sealing with the spool. The seal ring is a resilient member which is flanked by compression members bearing inwardly on the ring to extrude the ring against the spool and against the housing wall defining the chamber, to fluid seal at those areas. The seal ring projects beyond the flanking compression members and towards the spool, and a threaded gland member acts upon the seal ring to compress it to the desired amount. Also, a check valve is operatively disposed in the housing and is actuated by the spool, and guide means are provided for acting on the spool and keeping the spool clear of the seat for the check valve so that the seat is not damaged in the movement of the spool. The spool has a taper for variable metering of fluid pressure in the release of fluid through the check valve. The entire fluid flow control device can be mounted in a plate which is serving as a mounting member with an electric motor on one side and a fluid pump on the other side of the plate.
Inventors
- 👤 Rea I Hahn
- 👤 Robert W Broberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:40
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; F16K11/0712; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/8671
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
333 words
A fluid flow control device comprising a housing having a fluid inlet port and a fluid outlet port and a chamber, a spool slidably disposed in said chamber and having a circumferential fluid-sealing surface extending around said spool for a limited length of said spool, a resilient and mechanically and hydraulically compressible fluid seal ring disposed in said chamber and having a circumferentially fluid-sealing surface in contact with and of the diameter of said fluid-sealing surface on said spool for mating with the latter and fluid sealing therebetween, spool actuating means for moving said spool to a position where said fluid-sealing surface is out of contact with said fluid seal ring, a first compression member in contact with one end of said fluid seal ring and being freely disposed in said chamber and being exposed to the fluid pressure in said chamber on the axial end of said first compression member away from said fluid seal ring and being movable toward said fluid seal ring under the influence of the fluid pressure, a second compression member in contact with said axial end of said first compression member at the radial outer edge thereof and being discrete relative to the latter and being of an area less than that of said first compression member at the area of contact therebetween for exposing said axial end of said first compression member to the fluid pressure in fluid pressurizing said fluid seal ring and for transmitting mechanical pressure to said fluid seal ring through force from said compression members, and an adjustable threaded member movably disposed in said housing on the axis of said compression members and at the axial end of said second compression member opposite the location of said first compression member, said housing and said adjustable member being threaded together with space therebetween in the axial direction from said adjustable member toward the other said members for adjustable movement of said adjustable member toward the other said members in applying the mechanical force.
Claim 2
Dependent Claim
333 words
A fluid flow control device comprising a housing having a fluid inlet port and a fluid outlet port and a chamber, a spool slidably disposed in said chamber and having a circumferential fluid-sealing surface extending around said spool for a limited length of said spool, a resilient and mechanically and hydraulically compressible fluid seal ring disposed in said chamber and having a circumferentially fluid-sealing surface in contact with and of the diameter of said fluid-sealing surface on said spool for mating with the latter and fluid sealing therebetween, spool actuating means for moving said spool to a position where said fluid-sealing surface is out of contact with said fluid seal ring, a first compression member in contact with one end of said fluid seal ring and being freely disposed in said chamber and being exposed to the fluid pressure in said chamber on the axial end of said first compression member away from said fluid seal ring and being movable toward said fluid seal ring under the influence of the fluid pressure, a second compression member in contact with said axial end of said first compression member at the radial outer edge thereof and being discrete relative to the latter and being of an area less than that of said first compression member at the area of contact therebetween for exposing said axial end of said first compression member to the fluid pressure in fluid pressurizing said fluid seal ring and for transmitting mechanical pressure to said fluid seal ring through force from said compression members, and an adjustable threaded member movably disposed in said housing on the axis of said compression members and at the axial end of said second compression member opposite the location of said first compression member, said housing and said adjustable member being threaded together with space therebetween in the axial direction from said adjustable member toward the other said members for adjustable movement of said adjustable member toward the other said members in applying the mechanical force.
Claim 3
Dependent Claim
66 words
The subject matter of claim 1, wherein the ends of said compression members at said area of contact between said compression members are of two different overall sizes, and with said end of said second compression member being smaller in overall size than the overall size of said end of said first compression member, for exposing said end of said first compression member to fluid pressure.
Claim 4
Dependent Claim
68 words
The subject matter of claim 1, wherein said compression members are cylinders throughout the entire lengths of both in the direction of contact therebetweeN, and with said second compression member being of a lesser overall area on its end of contact than is the overall area of said first compression member on its end of contact, for exposing said end of said first compression member to fluid pressure.
Claim 5
Dependent Claim
134 words
The subject matter of claim 1, wherein said spool extends through said fluid seal ring, said fluid seal ring having a continuous planar surface extending radially thereof along its axial end adjacent said first compression member, said first compression member being a cylindrically shaped washer having a continuous planar surface on the axial end thereof in contact with said planar surface of said fluid seal ring and having an internal diameter greater than the internal diameter of said fluid seal ring to have the latter extend beyond said washer and into contact with said fluid-sealing surface of said spool, and said second compression member being cylindrically shaped throughout its entire length and having an internal diameter greater than the internal diameter of said washer, for exposing said end of said washer to fluid pressure.
Claim 6
Dependent Claim
166 words
The subject matter of claim 1, wherein said spool extends through said fluid seal ring and is cylindrical in shape and has alternate large and small circular surfaces extending along the axial length of said spool, said spool fluid-sealing surface existing on each of said large circular surfaces, a plurality of said fluid seal rings, one of said fluid seal rings for each of said large circular surfaces and with the latter being in fluid-sealing contact with the internal circular surface of the respective one of said fluid seal rings, said fluid seal rings being spaced along said chamber and said spool being movable along said chamber and said spool large and small circular surfaces being spaced along said spool, all for axial displacement of said large circular surfaces out of contact with said fluid seal rings upon axial movement of said spool, and with said inlet port and said outlet port being at opposite axial ends of at least one of said fluid seal rings.
Claim 7
Dependent Claim
56 words
The subject matter of claim 5, wherein said first compression member is a cylindrically shaped washer having an internal diameter greater than the internal diameter of said fluid seal ring, to have the inner circular surface of said internal diameter of said first compression member spaced radially outwardly from said large circular surfaces on said spool.
Claim 8
Dependent Claim
90 words
The subject matter of claim 6, wherein there is one of said inlet port and there are a plurality of said outlet ports, two of said seal rings on opposite sides of said inlet port for fluid sealing beyond said two seal rings and relative to said inlet port and along said large circular surface of said spool, and there being one of said fluid seal rings between every two of said outlet ports for fluid sealing between said outlet ports and along said large circular surface of said spool.
Claim 9
Dependent Claim
35 words
The subject matter of claim 7, including a spring operative on said spool for yieldingly axially urging said spool to a position where said large circular surfaces are in contact with said fluid seal rings.
Claim 10
Dependent Claim
64 words
The subject matter of claim 7, wherein said spool has a fluid passageway extending from one of said circular surfaces to one axial end of said spool, one of said outlet ports being located to be in constant fluid flow communication with said passageway, and with said passageway being in fluid flow communication with said inlet port in one axial position of said spool.
Claim 11
Dependent Claim
35 words
The subject matter of claim 6, including a spring operative on said spool for yieldingly axially urging said spool to a position where said large circular surface is in contact with said fluid seal ring.
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |