Diaphragm Pumps with Chamber Crossventing

摘要

Illustrative embodiments of diaphragm pumps with chamber crossventing, and methods of operating such pumps, are disclosed. In at least one illustrative embodiment, a method of operating a diaphragm pump may comprise communicating compressed fluid from a compressed fluid inlet to a first motive fluid chamber to cause first and second diaphragms to move to a first end-of-stroke position, communicating compressed fluid from the first motive fluid chamber to a second motive fluid chamber while the first and second diaphragms are in the first end-of-stroke position, communicating compressed fluid from the compressed fluid inlet to the second motive fluid chamber to cause the first and second diaphragms to move to a second end-of-stroke position, and communicating compressed fluid from the second motive fluid chamber to the first motive fluid chamber while the first and second diaphragms are in the second end-of-stroke position.

主权项

1. A diaphragm pump comprising:
a housing defining a first cavity and a second cavity; a first diaphragm disposed in the first cavity to separate the first cavity into a first motive fluid chamber and a first pumped media chamber; a second diaphragm disposed in the second cavity to separate the second cavity into a second motive fluid chamber and a second pumped media chamber; a shaft coupled between the first and second diaphragms and configured to move reciprocally with the first and second diaphragms between a first end-of-stroke position and a second end-of-stroke position; a main valve fluidly coupled between a compressed fluid inlet and the first and second motive fluid chambers, the main valve being movable between (i) a first position in which the main valve is configured to communicate compressed fluid from the compressed fluid inlet to the first motive fluid chamber and (ii) a second position in which the main valve is configured to communicate compressed fluid from the compressed fluid inlet to the second motive fluid chamber; and a crossvent valve fluidly coupled between the first and second motive fluid chambers, the crossvent valve being configured to (i) communicate compressed fluid between the first and second motive fluid chambers during a time period when the main valve is between the first and second positions and (ii) resist communication of compressed fluid between the first and second motive fluid chambers when the main valve is in either of the first and second positions.