US3594745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve for signaling three conditions
Assignee: Norgren LLC
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Filing: 1969-05-08
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Granted: 1971-07-20
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Expires: 1989-05-08
Abstract
Abstract A piston-type valve operated by air or other gas characterized by an input supply port and an input control port to which equal pressures are applied, a first signal output port communicating with the supply port when the control pressure decays below a predetermined value, and a manually operated spool valve moveable to a position for disestablishing communication between the supply port and first signal port and also establishing communication between the supply port and a second signal output port. The first output port may operate an audible annunciator and visible red light which indicates that the control pressure has decayed and the second output port may operate a signal device, such as an amber light, which indicates that an operator has acknowledged receipt of the previous alarm signal. During normal operation, the control pressure may operate a green light only when its pressure is above a predetermined value. The lights thus operate sequentially, green indicating normal control pressure in the system, red indicating a danger condition and amber indicating acknowledgement of the alarm condition. When the control pressure is restored to normal, the valve parts are automatically moved to their original positions.
Inventors
- 👤 William M Nickels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:13
CPC Classifications
F; F15; F15B; F15B13/00; F15C; F15C3/00; F15C3/02; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8326
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
248 words
A valve device for detecting decay of a control pressure, comprising: a. a valve body, b. a piston slideable in the valve body between a normal position and a second position, c. the piston having one end in constant communication with an input control pressure port and an opposite end in communication with an input supply pressure port, the areas of said ends being so proportioned to urge the piston to its normal position when the control pressure is above a predetermined value, d. a first output port adapted to be isolated from the supply port when the piston is in its normal position and to communicate with the supply port when the piston moves to its second position. e. a valve member slideable in the valve body between a normal position and a second position, f. the valve member having a head end in communication with the supply port when it is disposed in its normal position, and a channel in same for communicating the supply port with a second output port only when it is moved to its second position, g. the construction and arrangement being such that after said piston moves to its second position, movement of the valve member to its second position disestablishes communication between the supply port and first output port and establishes communication between the supply port and the second output port, and resumption of control pressure to a predetermined value returns the piston and valve member to their normal positions.
Claim 2
Dependent Claim
248 words
A valve device for detecting decay of a control pressure, comprising: a. a valve body, b. a piston slideable in the valve body between a normal position and a second position, c. the piston having one end in constant communication with an input control pressure port and an opposite end in communication with an input supply pressure port, the areas of said ends being so proportioned to urge the piston to its normal position when the control pressure is above a predetermined value, d. a first output port adapted to be isolated from the supply port when the piston is in its normal position and to communicate with the supply port when the piston moves to its second position. e. a valve member slideable in the valve body between a normal position and a second position, f. the valve member having a head end in communication with the supply port when it is disposed in its normal position, and a channel in same for communicating the supply port with a second output port only when it is moved to its second position, g. the construction and arrangement being such that after said piston moves to its second position, movement of the valve member to its second position disestablishes communication between the supply port and first output port and establishes communication between the supply port and the second output port, and resumption of control pressure to a predetermined value returns the piston and valve member to their normal positions.
Claim 3
Dependent Claim
42 words
A device in accordance with claim 1 including a first alarm signal apparatus operatively connected to the first output port, and a second signal apparatus operatively connected to the second output port for acknowledging receipt, by an operator, of the alarm signal.
Claim 4
Dependent Claim
21 words
A device in accordance with claim 2 wherein the alarm signal apparatus includes an audible alarm device, such as an annunciator.
Claim 5
Dependent Claim
60 words
A device in accordance with claim 3 including a green light adapted to be illuminated only when the piston is disposed at its normal position, a red light adapted to be illuminated only when the piston moves to its second position, and an amber light adapted to be illuminated only when the valve member is moved to its second position.
Claim 6
Dependent Claim
65 words
A device in accordance with claim 1 wherein said valve member is a spool-type valve, said channel being an annular space between its ends, one end of the valve member normally projecting from the valve body and adapted to be manually depressed to its second position at which it remains, upon removal of a depressing force, until control pressure is resumed to a predetermined value.
Claim 7
Dependent Claim
35 words
A device in accordance with claim 5 wherein the projecting end of the valve member moves to the second position at which it is inaccessible to an operator to return it to its normal position.
Claim 8
Dependent Claim
55 words
A device in accordance with claim 1 wherein said one end of the piston is of greater area than said opposite end, and the control pressure is normally substantially the same as the supply pressure, whereby the piston is moved to its normal position by a force applied to the differential area of its ends.
Claim 9
Dependent Claim
27 words
A device in accordance with claim 1 wherein said valve body is provided with a threaded end adapted to be secured to an aperture in a panel.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |