US3583436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure valve indicating means
Assignee: Whitnash PLC
•
Filing: 1969-09-10
•
Granted: 1971-06-08
•
Expires: 1989-09-10
Abstract
Abstract A valve having two pistons slidable in a through bore and spring loaded apart from each other against stops, an inlet port communicating with the space between the two pistons and passages through the two pistons controlled by nonreturn valves which prevent back flow to the space between the two pistons. A plunger is slidable in a cylinder which is in communication with the space between the two pistons, the plunger carrying the movable contact of an electric switch which operates an alarm device. The arrangement is such that acceptable variations in the pressure of fluid fed to the space between the pistons through the inlet port is compensated for automatically by movement of the pistons to alter the volume of the space and thus maintain the pressure of fluid therein substantially constant, whereas the plunger, which is normally supported by the pressure of fluid within the space between the pistons so as to hold the electric switch open, moves with an unacceptable loss of pressure within the space between the pistons to close the electric switch and operate the alarm device.
Inventors
- 👤 Leslie C Chouings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:19
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T11/00; B60T11/10; B60T11/28; B60T11/32; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8326
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
A valve device for connecting a fluid pressure generating device to two fluid pressure storage devices, comprising a valve body having first and second valve ports interconnected by a valve bore within said valve body, a third valve port which opens into said valve bore between said first and second valve ports, two pistons in said bore urged by spring means against stops which locate them one either side of said third valve port, passages for the flow of fluid from said third valve port past said pistons to said first and second valve ports, and nonreturn valves in said passages to prevent backflow of fluid from said first and second valve ports to said third valve port.
Claim 2
Dependent Claim
118 words
A valve device for connecting a fluid pressure generating device to two fluid pressure storage devices, comprising a valve body having first and second valve ports interconnected by a valve bore within said valve body, a third valve port which opens into said valve bore between said first and second valve ports, two pistons in said bore urged by spring means against stops which locate them one either side of said third valve port, passages for the flow of fluid from said third valve port past said pistons to said first and second valve ports, and nonreturn valves in said passages to prevent backflow of fluid from said first and second valve ports to said third valve port.
Claim 3
Dependent Claim
47 words
A valve device as claimed in claim 1, having fluid pressure responsive control means for a warning device, the fluid pressure responsive control means including a plunger slidable in a cylinder connected to said valve bore in substantially the same cross-sectional plane thereof as said third port.
Claim 4
Dependent Claim
102 words
A valve device as claimed in claim 2, wherein said fluid pressure responsive means includes an electric switch which is spring-biased to its closed condition and which is arranged to be held open by the action on said plunger of fluid under pressure supplied to said valve bore through said third valve port, the arrangement being such that the fluid pressure acting upon said plunger to hold said electric switch open is reduced upon the occurrence of a loss of pressure at one only of said first and second ports so that the electric switch is closed to operate the warning device.
Claim 5
Dependent Claim
20 words
A valve device as claimed in claim 3, wherein said valve body affords a fixed contact of the electric switch.
Claim 6
Dependent Claim
85 words
A valve device as claimed in claim 4, wherein the end of the plunger remote from said valve bore carries a movable electrical contact which has a greater diameter than the plunger, the movable electrical contact being positioned within a space into which opens the end of the cylinder remote from said valve bore and being movable into engagement with a fixed annular contact surface defined by that part of said valve body which defines a wall of the space and surrounds the cylinder opening.
Claim 7
Dependent Claim
52 words
A valve device as claimed in claim 5, wherein the space comprises another cylinder having a greater diameter than both the plunger and the movable electrical contact, and including resilient means mounted within the other cylinder, the resilient means urging the movable electrical contact into engagement with the fixed annular contact surface.
Claim 8
Dependent Claim
14 words
A valve device according to claim 2, wherein the warning device Comprises a light.
Claim 9
Dependent Claim
16 words
A valve device according to claim 2, wherein the warning device comprises an audible alarm device.
Claim 10
Dependent Claim
23 words
A valve device according to claim 1, wherein a passage for the flow of fluid past a piston is formed in that piston.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |