US4074688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pilot valve
Assignee: AXELSON Inc A DE CORP
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Filing: 1977-05-23
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Granted: 1978-02-21
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Expires: 1997-05-23
Abstract
Abstract There is disclosed a valve having a valving element longitudinally reciprocable within a bore in the body of the valve between alternate positions for controlling the flow of a first fluid between lateral ports connecting with the bore. A piston connected to one end of the valving element is urged in a direction to move the valving element to one position by a force due to the pressure of a second fluid acting over the piston, and a stem on the other end extends through the valve body to provide an externally accessible part which may be manipulated to shift the valving element between its alternate positions. Means are provided for holding the valving element in its one position, automatically in response to manipulation of the stem to shift it into that position and irrespective of the pressure of the second fluid acting over the piston.
Inventors
- 👤 David E. Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:29
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/04; F16K11/044; Y; Y10; Y10T; Y10T137/00; Y10T137/5109; Y10T137/8593; Y10T137/86485; Y10T137/86493; Y10T137/86574; Y10T137/86622; Y10T137/8663
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
427 words
A valve, comprising a body having a bore extending longitudinally therein and lateral ports connecting with the bore at longitudinally spaced locations, a valving element longitudinally reciprocable within the bore between first and second positions, said valving element having longitudinally spaced seal rings thereabout sealably slidable within the bore for controlling the flow of a first fluid between the lateral ports in each of said positions, said body having a chamber at one end of the bore including a cylinder having an inner enlarged diameter portion, an outer reduced diameter portion disposed coaxially of the bore and a circumferential recess at the intersection of the enlarged and reduced portions, a piston longitudinally reciprocable within the cylinder between first and second positions, means connecting the valving element to the piston for longitudinal movement therewith between its first and second position, said piston including an enlarged diameter portion longitudinally reciprocable within the enlarged diameter cylinder portion and a reduced diameter portion longitudinally reciprocable within the reduced diameter cylinder portion, said reduced piston portion having a first groove thereabout to receive a first seal ring for sealably sliding within the reduced cylinder portion said body having a port therein connecting with the reduced cylinder portion on the outer side of the first seal ring thereabout, said enlarged piston portion having second and third longitudinally spaced grooves thereabout each to receive second and third seal rings, respectively, for sealably sliding within the enlarged cylinder portion, the third groove being so located that when the third seal ring is received therein, it remains sealably engaged with the enlarged cylinder portion during reciprocation of the piston between its first and second positions, whereby, in the absence of said first and second seal rings, the piston is urged from its second toward its first position by a force due to the pressure of the second fluid acting over the third seal ring, and the second groove being so located that when the second seal ring is received therein, it is disposed within said recess when the piston is in its second position, but moves into sealing engagement with the enlarged cylinder portion when the first seal ring moves out of sealing engagement with the reduced cylinder portion, whereby, in the absence of said third seal ring, the piston is initially urged from its second toward its first position by a force due to the pressure of the second fluid acting over the first seal ring and then by a force due to the pressure of said second fluid acting over the second seal ring.
Claim 2
Dependent Claim
427 words
A valve, comprising a body having a bore extending longitudinally therein and lateral ports connecting with the bore at longitudinally spaced locations, a valving element longitudinally reciprocable within the bore between first and second positions, said valving element having longitudinally spaced seal rings thereabout sealably slidable within the bore for controlling the flow of a first fluid between the lateral ports in each of said positions, said body having a chamber at one end of the bore including a cylinder having an inner enlarged diameter portion, an outer reduced diameter portion disposed coaxially of the bore and a circumferential recess at the intersection of the enlarged and reduced portions, a piston longitudinally reciprocable within the cylinder between first and second positions, means connecting the valving element to the piston for longitudinal movement therewith between its first and second position, said piston including an enlarged diameter portion longitudinally reciprocable within the enlarged diameter cylinder portion and a reduced diameter portion longitudinally reciprocable within the reduced diameter cylinder portion, said reduced piston portion having a first groove thereabout to receive a first seal ring for sealably sliding within the reduced cylinder portion said body having a port therein connecting with the reduced cylinder portion on the outer side of the first seal ring thereabout, said enlarged piston portion having second and third longitudinally spaced grooves thereabout each to receive second and third seal rings, respectively, for sealably sliding within the enlarged cylinder portion, the third groove being so located that when the third seal ring is received therein, it remains sealably engaged with the enlarged cylinder portion during reciprocation of the piston between its first and second positions, whereby, in the absence of said first and second seal rings, the piston is urged from its second toward its first position by a force due to the pressure of the second fluid acting over the third seal ring, and the second groove being so located that when the second seal ring is received therein, it is disposed within said recess when the piston is in its second position, but moves into sealing engagement with the enlarged cylinder portion when the first seal ring moves out of sealing engagement with the reduced cylinder portion, whereby, in the absence of said third seal ring, the piston is initially urged from its second toward its first position by a force due to the pressure of the second fluid acting over the first seal ring and then by a force due to the pressure of said second fluid acting over the second 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) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |