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Dosmatic U.S.A., Inc. (also known as Dosmatic) is a Texas-based company which manufactures dosing pumps, fertigators, medicators and chemical injectors. Dosmatic U.S.A. International, Inc. was founded in 1981 by Frank Walton as a small sales company for chemical injectors. [1]
The working fluid is 3 He, which is circulated by vacuum pumps at room temperature. The 3 He enters the cryostat at a pressure of a few hundred millibar. In the classic dilution refrigerator (known as a wet dilution refrigerator), the 3 He is precooled and purified by liquid nitrogen at 77 K and a 4 He bath at 4.2 K.
Figure 1 represents the Stirling-type single-orifice pulse-tube refrigerator (PTR), which is filled with a gas, typically helium at a pressure varying from 10 to 30 bar. From left to right the components are: a compressor, with a piston moving back and forth at room temperature T H
The pump used a leather hose which did not need to self-open when released by the rollers, instead relying on the incoming water having sufficient pressure to fill the open inlet end on each cycle. [1] The peristaltic pump was first patented in the United States by Rufus Porter and J. D. Bradley in 1855 (U.S. Patent number 12753) [2] as a well ...
The term "metering pump" is based on the application or use rather than the exact kind of pump used, although a couple types of pumps are far more suitable than most other types of pumps. [ 2 ] Although metering pumps can pump water , they are often used to pump chemicals , solutions , or other liquids.
Dosing is done in wet processes with dosing pumps but even more importantly in dry processes, just prior to the packaging of the product. Dosing of dry materials is commonly done through Gain-in-Weight dosing or Loss-in-Weight dosing using equipment on load cells. [1]