Patent US3768518A successfully refreshed from Google Patents.
US3768518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid transfer valve
Assignee: Individual
•
Filing: 1971-03-01
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Granted: 1973-10-30
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Expires: 1991-03-01
Abstract
Abstract A fluid transfer valve has a housing with a hollow interior, and a tubular piston with a passage through it movably disposed within the hollow interior. The piston is normally maintained in a closed position sealed to the interior of the housing to prevent fluid communication between an inlet in the housing and the passage through the piston. The piston slides to an open position in which fluid under pressure flows from the inlet through the passage in the piston. When the piston moves to its open position, the fluid delivered to the passage through the piston flows out an outlet in the housing.
Inventors
- 👤 V Roth
- 👤 A Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:59
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86622; Y10T137/8663; Y10T137/8667; Y10T137/86694; Y10T137/86702
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
232 words
A fluid transfer valve comprising a housing having a hollow interior; an elongated tubular piston having a passage therethrough, an outwardly extending shoulder spanning the outer periphery of an intermediate portion of the piston, the piston defining an upper portion above the shoulder and a lower portion below the shoulder, an inlet port extending through the upper portion of the piston and opening into the passage through the piston, and an outlet port extending through the lower portion of the piston and opening into the passage through the piston, the piston being slidably disposed within the hollow interior to travel between a closed position and an open position; fluid inlet means in the housing communicating with the piston, the shoulder on the piston being maintained in sealing contact with the interior of the housing to prevent fluid communication between the fluid inlet means and the piston inlet port when the piston is in its closed position; fluid outlet means in the housing communicating with the piston; and means extending to a point outside the housing and coupled to the piston for slidably moving the piston to its open position for providing fluid communication between the fluid inlet means and the piston inlet port so that fluid under pressure can flow from the fluid inlet means, through the passage in the piston and the piston outlet port, and out the fluid outlet means.
Claim 2
Dependent Claim
232 words
A fluid transfer valve comprising a housing having a hollow interior; an elongated tubular piston having a passage therethrough, an outwardly extending shoulder spanning the outer periphery of an intermediate portion of the piston, the piston defining an upper portion above the shoulder and a lower portion below the shoulder, an inlet port extending through the upper portion of the piston and opening into the passage through the piston, and an outlet port extending through the lower portion of the piston and opening into the passage through the piston, the piston being slidably disposed within the hollow interior to travel between a closed position and an open position; fluid inlet means in the housing communicating with the piston, the shoulder on the piston being maintained in sealing contact with the interior of the housing to prevent fluid communication between the fluid inlet means and the piston inlet port when the piston is in its closed position; fluid outlet means in the housing communicating with the piston; and means extending to a point outside the housing and coupled to the piston for slidably moving the piston to its open position for providing fluid communication between the fluid inlet means and the piston inlet port so that fluid under pressure can flow from the fluid inlet means, through the passage in the piston and the piston outlet port, and out the fluid outlet means.
Claim 3
Dependent Claim
50 words
Apparatus according to claim 1 including fluid exhaust means in the housing for communicating with the hollow interior of the housing, the fluid exhaust means being located so it is in fluid communication with the fluid outlet means as the piston travels from its open position to its closed position.
Claim 4
Dependent Claim
79 words
Apparatus according to claim 2 including a shoulder formed in the interior of the housing between the piston outlet aNd the fluid exhaust means, said shoulder being located so that the lower portion of the piston can be maintained in sealing contact with the shoulder for preventing fluid communication between the fluid exhaust means and the piston outlet when the piston is in its open position to prevent communication between the fluid outlet means and the fluid exhaust means.
Claim 5
Dependent Claim
64 words
Apparatus according to claim 3 in which the piston has an exterior side wall, and including first and second seals extending between the piston side wall and the hollow interior of the housing and positioned on opposite sides of the fluid inlet port for confining fluid in the fluid inlet port at the piston side wall when the piston is in its closed position.
Claim 6
Dependent Claim
31 words
Apparatus according to claim 4 in which the piston inlet and outlet ports are positioned on opposite sides of the first and second seals, respectively, remote from the fluid inlet means.
Claim 7
Dependent Claim
42 words
Apparatus according to claim 1 including spring biasing means cooperating between the interior of the housing and the piston for urging the shoulder against the interior of the housing to maintain the shoulder in sealing contact with the interior of the housing.
Claim 8
Dependent Claim
55 words
Apparatus according to claim 6 including a shoulder in the interior of the housing between the upper portion of the piston and the fluid inlet means, the spring biasing means being operative to maintain the shoulder of the piston in contact with the shoulder of the housing when the piston is in its closed position.
Claim 9
Dependent Claim
63 words
Apparatus according to claim 1 in which the piston has an exterior side wall, and including first and second seals extending between the piston side wall and the hollow interior of the housing and positioned on opposite sides of the fluid inlet port confining fluid in the fluid inlet port at the piston side wall when the piston is in its closed position.
Claim 10
Dependent Claim
31 words
Apparatus according to claim 8 in which the piston inlet and outlet ports are positioned on opposite sides of the first and second seals, respectively, remote from the fluid inlet means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |