Pneumatic relay
AssigneeHoneywell Inc.
InventorLouis J. Bentsen
Life of this patent
Estimating the term…
Abstract
A pneumatic apparatus or relay which, in one embodiment, maintains the output pressure at a fixed level until the signal pressure obtains a predetermined value at which time the output pressure varies according to the signal pressure and, in a second embodiment, maintains the output pressure at a first level, which may be essentially zero, until the signal pressure obtains a predetermined value at which time the output pressure assumes a second level until the signal pressure reaches a second predetermined value and then the output pressure varies according to the signal pressure.
Claims14
A pneumatic relay comprising:
- terminal means adapted to be connected to a source of pressure;
- first housing means divided by a diaphragm into a control chamber and a flow chamber and having a nozzle in said flow chamber;
- first means connecting said terminal means to said flow chamber for supplying pressure to said flow chamber;
- output means connected to said first means for providing an output pressure dependent upon said pressure within said flow chamber;
- biasing means within said first housing means acting against said diaphragm for establishing a minimum predetermined value for said pressure within said flow chamber;
- and,
- second means including condition responsive means connected to said nozzle, said condition responsive means applying a signal pressure to said flow chamber and having sufficient capacity to bleed off said pressure supplied by said first means above said predetermined value until said signal pressure achieves a value substantially equal to said predetermined value
- whereby said output pressure will be substantially equal to said predetermined value until said signal pressure attains said value substantially equal to said predetermined value at which time said output pressure will follow said signal pressure.
An apparatus for providing a minimum output pressure comprising:
- terminal means adapted to be connected to a source of pressure;
- first valve means having a flow chamber, a nozzle within said flow chamber, and closing means for seating against said nozzle;
- first connecting means connecting said terminal means to said flow chamber for supplying pressure to said flow chamber;
- output means connected to said first connecting means for providing an output pressure dependent upon said pressure within said flow chamber;
- biasing means acting against said closing means for establishing a minimum predetermined value for said pressure within said flow chamber;
- and,
- condition responsive means connected to said nozzle for supplying a signal pressure to said flow chamber, said condition responsive means having means of sufficient capacity for bleeding off said pressure supplied by said first connecting means above said predetermined value until said signal pressure attains a value substantially equal to said predetermined value,
- whereby said output pressure will be substantially equal to said predetermined value until said signal pressure attains said value substantially equal to said predetermined value at which time said output pressure will follow said signal pressure.
Dependencies are inferred from the claim text.