Patent US3706322A successfully refreshed from Google Patents.
US3706322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve
Assignee: Individual
•
Filing: 1971-03-22
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Granted: 1972-12-19
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Expires: 1991-03-22
Abstract
Abstract A pressure actuated spool-type fluid valve in which the spool is shifted by the pressurized fluid with or without the assistance of mechanical spring means.
Inventors
- 👤 Carl M Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:18
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; F16K11/0716; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86622; Y10T137/8663
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
183 words
A pressure actuated fluid valve including in combination a valve body, a longitudinal bore formed in said body, a spool disposed within said bore and movable therein, a plurality of porting areas formed by facing surfaces of said spool and said body, a plurality of ports formed in said body and communicating with respective porting areas, valving pairs formed on said spool and said body cooperating in predetermined relative positions of said spool and said body to communicate respective porting areas, pilot and return chambers formed in said body, a normal position of said spool relative to said body in the unpressurized condition of said pilot chamber and a pressure position of said spool in the pressurized condition of said pilot chamber, said pilot and return chambers communicating with said spool in such manner that pressure in said pilot chamber from an external source urges said spool toward the pressure position and pressure developed in said return chamber urges said spool toward the normal position, a communication porting area, and a return chamber conduit communicating said return chamber and said communication porting area.
Claim 2
Dependent Claim
183 words
A pressure actuated fluid valve including in combination a valve body, a longitudinal bore formed in said body, a spool disposed within said bore and movable therein, a plurality of porting areas formed by facing surfaces of said spool and said body, a plurality of ports formed in said body and communicating with respective porting areas, valving pairs formed on said spool and said body cooperating in predetermined relative positions of said spool and said body to communicate respective porting areas, pilot and return chambers formed in said body, a normal position of said spool relative to said body in the unpressurized condition of said pilot chamber and a pressure position of said spool in the pressurized condition of said pilot chamber, said pilot and return chambers communicating with said spool in such manner that pressure in said pilot chamber from an external source urges said spool toward the pressure position and pressure developed in said return chamber urges said spool toward the normal position, a communication porting area, and a return chamber conduit communicating said return chamber and said communication porting area.
Claim 3
Dependent Claim
21 words
A pressure actuated fluid valve in accordance with claim 1 in which the return chamber conduit is formed in said spool.
Claim 4
Dependent Claim
34 words
A pressure actuated fluid valve in accordance with claim 1 in which said pilot chamber and said return chamber are formed in said body at opposite ends of said spool on the axis thereof.
Claim 5
Dependent Claim
36 words
A pressure actuated fluid valve in accordance with claim 1 in which upon pressurization of said pilot chamber and the movement of said spool towards said pressure position the communication porting area pressure condition is changed.
Claim 6
Dependent Claim
28 words
A pressure actuated fluid valve in accordance with claim 1 in which said communication porting area is exhausted in said normal position and pressurized in said pressure position.
Claim 7
Dependent Claim
221 words
A pressure actuated fluid valve including in combination a valve body, a longitudinal bore formed in said body, a spool disposed within said bore and movable therein, a plurality of porting areas formed by facing surfaces of said spool and said body, a plurality of ports formed in said body and communicating with respective porting areas, valving pairs formed on said spool and said body cooperating in predetermined relative positions of said spool and said body to communicate respective porting areas, pilot and return chambers formed in said body, a normal position of said spool relative to said body in the unpressurized condition of said pilot chamber and a pressure position of said spool in the pressurized condition of said pilot chamber, said pilot and return chambers communicating with said spool in sUch manner that pressure in said pilot chamber urges said spool toward the pressure position and pressure in said return chamber urges said spool toward the normal position, a communication porting area, said communication porting area being exhausted in said normal position and pressurized in said pressure position, and a return chamber conduit communicating said return chamber and said communication porting area whereby the pressurization of said pilot chamber causes a build-up of pressure in said return chamber preventing further movement of said spool when a balanced condition exists.
Claim 8
Dependent Claim
221 words
A pressure actuated fluid valve including in combination a valve body, a longitudinal bore formed in said body, a spool disposed within said bore and movable therein, a plurality of porting areas formed by facing surfaces of said spool and said body, a plurality of ports formed in said body and communicating with respective porting areas, valving pairs formed on said spool and said body cooperating in predetermined relative positions of said spool and said body to communicate respective porting areas, pilot and return chambers formed in said body, a normal position of said spool relative to said body in the unpressurized condition of said pilot chamber and a pressure position of said spool in the pressurized condition of said pilot chamber, said pilot and return chambers communicating with said spool in sUch manner that pressure in said pilot chamber urges said spool toward the pressure position and pressure in said return chamber urges said spool toward the normal position, a communication porting area, said communication porting area being exhausted in said normal position and pressurized in said pressure position, and a return chamber conduit communicating said return chamber and said communication porting area whereby the pressurization of said pilot chamber causes a build-up of pressure in said return chamber preventing further movement of said spool when a balanced condition exists.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |