Transfer system
First Claim
1. A transfer device for the withdrawal of aliquots from a container of bulk solution comprising:
- body means having;
first walls defining a tapered chamber;
second walls defining a first passage venting the smaller end of said chamber to the surrounding air;
third walls defining a second passage communicating at one end with the larger end of said chamber; and
fourth walls defining a third passage having one end for withdrawal of fluid therefrom, said third passage being free of communication with said first and second passages and said chamber within said body means;
a tapered valve element received within said chamber for movement between first and second conditions in response to changes in the pressure differential between the first and second passages, said first condition providing a fluid seal between the first and second passages by engagement of said valve element with said first walls of the chamber for pressures within the second passage greater than that within the first passage, and said second condition providing a fluid path from the first passage to the second passage for pressures within the second passage less than that within the first passage; and
means for placing the other ends of said second and third passages in communication with the interior of the container of bulk solution;
whereby a path is provided for air to be drawn into the container through the first and second passages when aliquots are withdrawn from the container through the third passage, but fluid is not able to escape from the container through the first and second passages.
4 Assignments
0 Petitions
Accused Products
Abstract
A transfer device for withdrawal of aliquots from a container of bulk solution is provided with a body having a tapered chamber, a first passage venting the smaller end of the chamber to the surrounding air, a second passage communicating at one end with the larger end of the chamber, and a third passage having one end for withdrawal of fluid therefrom. A tapered valve element is received within the chamber for movement between first and second conditions in response to changes in the presence differential between the first and second passages. The first condition provides a fluid seal between the first and second passages by engagement of the valve element with the walls of the chamber for pressures within the second passage greater than that within the first passage, and the second condition provides a fluid path from the first passage to the second passage for pressures within the second passage somewhat less than that within the first passage. The device further includes structure placing the other ends of the second and third passages in commuication with the interior of the container of bulk solution, such that a path is provided for air to be drawn into the container when aliquots of solution are withdrawn from the container through the third passage.
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Citations
17 Claims
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1. A transfer device for the withdrawal of aliquots from a container of bulk solution comprising:
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body means having; first walls defining a tapered chamber; second walls defining a first passage venting the smaller end of said chamber to the surrounding air; third walls defining a second passage communicating at one end with the larger end of said chamber; and fourth walls defining a third passage having one end for withdrawal of fluid therefrom, said third passage being free of communication with said first and second passages and said chamber within said body means; a tapered valve element received within said chamber for movement between first and second conditions in response to changes in the pressure differential between the first and second passages, said first condition providing a fluid seal between the first and second passages by engagement of said valve element with said first walls of the chamber for pressures within the second passage greater than that within the first passage, and said second condition providing a fluid path from the first passage to the second passage for pressures within the second passage less than that within the first passage; and means for placing the other ends of said second and third passages in communication with the interior of the container of bulk solution; whereby a path is provided for air to be drawn into the container through the first and second passages when aliquots are withdrawn from the container through the third passage, but fluid is not able to escape from the container through the first and second passages. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for the dispensation of aliquots of a bulk solution, comprising:
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a container of bulk solution; and a transfer device comprising; body means having; first walls defining a tapered chamber; second walls defining a first passage venting the smaller end of said chamber to the surrounding air; third walls defining a second passage communicating at one end with the larger end of said chamber; and fourth walls defining a third passage having one end for withdrawal of fluid therefrom, said third passage being free of communication with said first and second passages and said chamber within said body means; a tapered valve element received within said chamber for movement between first and second conditions in response to changes in the pressure differential between the first and second passages, said first condition providing a fluid seal between the first and second passages by engagement of said valve element with said first walls of the chamber for pressures within the second passage greater than that within the first passage, and said second condition providing a fluid path from the first passage to the second passage for pressures within the second passage less than that within the first passage; and means for placing the other ends of said second and third passages in communication with the interior of the container of bulk solution; whereby a path is provided for air to be drawn into the container through the first and second passages when aliquots are withdrawn from the container through the third passage, but fluid is not able to escape from the container through the first and second passages.
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9. A system for the dispensation of aliquots of a bulk solution, comprising:
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a container of bulk solution; and a transfer device comprising; body means having; first walls defining a tapered chamber; second walls defining a first passage venting the smaller end of said chamber to the surrounding air; third walls defining a second passage communicating at one end with the larger end of said chamber; and fourth walls defining a third passage having one end for withdrawal of fluid therefrom, said third passage being free of communication with said first and second passages and said chamber within said body means; a tapered valve element received within said chamber for movement between first and second conditions in response to changes in the pressure differential between the first and second passages, said first condition providing a fluid seal between the first and second passages by engagement of said valve element with said first walls of the chamber for pressures within the second passage greater than that within the first passage, and said second condition providing a fluid path from the first passage to the second passage for pressures within the second passage less than that within the first passage; and means for placing the other ends of said second and third passages in communication with the interior of the container of bulk solution; and flow valve means having first and second ports, said first port communicating with said one end of the third passage and said flow valve means operable between a first condition providing a fluid path between the first and second ports and a second condition providing a fluid seal between the first and second ports; whereby withdrawal of fluid from the second port for the valve means in said first condition causes fluid to be drawn from the container through the third passage of the body means and provides a path for air to be simultaneously drawn into the container through the first and second passages of the body means, but fluid is in no event able to escape from the container through the first and second passages. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification