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US 2011/0033313 A1Published application
Air Flow Control Apparatus
AssigneeCampbell Hausfeld/Scott Fetzer Company
InventorsChristopher Gruber, David O. Shumate, James W. Happe, JR., Steven R. Salmons, Jeffrey P. VanHorn
Life of this patent
Estimating the term…
Abstract
An apparatus includes a valve housing having an inlet port, a first chamber with a first outlet port, and a second chamber with a second outlet port. A first valve opens between the inlet port and the first chamber under a first level of pneumatic pressure at the inlet port. A second valve opens between the first chamber and the second chamber under a second, greater level of pneumatic pressure in the first chamber. A third valve opens between the second chamber and the first chamber under a third level of pneumatic pressure in the second chamber, with the third level being less than the first level.
Claims18
An apparatus comprising:
- a valve housing having an inlet port, a first chamber with a first outlet port, and a second chamber with a second outlet port;
- a first valve configured to open a pneumatic flow path from the inlet port to the first chamber in response to a first level of pneumatic pressure at the inlet port;
- a second valve configured to open a pneumatic flow path from the first chamber to the second chamber in response to a second, greater level of pneumatic pressure in the first chamber;
- and
- a third valve configured to open a pneumatic flow path from the second chamber to the first chamber in response to a third level of pneumatic pressure in the second chamber, with the third level being less than the first level.
2 more elements
An apparatus comprising:
- a valve housing having an inlet port, a first chamber with a first outlet port, and a second chamber with a second outlet port;
- a first spring-loaded check valve configured to open a pneumatic flow path from the inlet port to the first chamber under pneumatic pressure at the inlet port;
- a second spring-loaded check valve configured to open a pneumatic flow path from the first chamber to the second chamber under pneumatic pressure in the first chamber;
- and
- a flapper check valve configured to open a pneumatic flow path from the second chamber to the first chamber under pneumatic pressure in the second chamber.
2 more elements
An apparatus comprising:
- a compressor;
- a tank;
- a pneumatic output line;
- a first valve configured to open a pneumatic flow path from the compressor to the output line in response to a first level of pneumatic pressure;
- a second valve configured to open a pneumatic flow path from the output line to the tank in response to a second, greater level of pneumatic pressure;
- and
- a third valve configured to open a pneumatic flow path from the tank to the output line in response to a third level of pneumatic pressure less than the first level.
4 more elements
An apparatus comprising:
- a compressor;
- a tank;
- a pneumatic output line;
- a valve housing having an inlet port coupled to the compressor to receive compressed air from the compressor, a first chamber with a first outlet port coupled to the output line to provide compressed air to the output line, and a second chamber with a second outlet port coupled to the tank to provide compressed air to the tank;
- a first valve configured to open a pneumatic flow path from the inlet port to the first chamber in response to a first level of pneumatic pressure at the inlet port;
- a second valve configured to open a pneumatic flow path from the first chamber to the second chamber in response to a second, greater level of pneumatic pressure in the first chamber;
- and
- a third valve configured to open a pneumatic flow path from the second chamber to the first chamber in response to a third level of pneumatic pressure in the second chamber, with the third level being less than the first level.
5 more elements
An apparatus comprising:
- a compressor;
- a tank;
- a pneumatic output line;
- a valve housing having an inlet port coupled to the compressor to receive compressed air from the compressor, a first chamber with a first outlet port coupled to the output line to provide compressed air to the output line, and a second chamber with a second outlet port coupled to the tank to provide compressed air to the tank;
- a first spring-loaded check valve configured to open a pneumatic flow path from the inlet port to the first chamber under pneumatic pressure at the inlet port;
- a second spring-loaded check valve configured to open a pneumatic flow path from the first chamber to the second chamber under pneumatic pressure in the first chamber;
- and
- a flapper check valve configured to open a pneumatic flow path from the second chamber to the first chamber under pneumatic pressure in the second chamber.
5 more elements
Dependencies are inferred from the claim text.