Chemistry: physical processes – Physical processes – Crystallization
Patent
1975-05-30
1976-11-09
Serwin, R.E.
Chemistry: physical processes
Physical processes
Crystallization
73422R, 23253R, 01N 118, G01N 110, G01N 116, G01N 118
Patent
active
039908534
ABSTRACT:
A pneumatically operated liquid transfer valve structure formed of a pair of stationary elements sandwiching a slidably movable element which includes a two pair of spaced parallel arranged through passageways of precise known volume oriented normal to the direction of travel of the slidable element, said passageways adapted to communicate alternately between aligned ones of the two pair of similar passageways formed in each of the stationary elements and arranged axially aligned. The slidably movable element is propelled to its reciprocal positions by fluid pumps each of which includes a cylinder having a flexible diaphragm and a reciprocable plunger mounted on a piston. Each pump is arranged on opposite ends of the valve elements. The free ends of the plungers are arranged selectively to engage one or the other ends of the slidable element at the limits of its path of travel. Each pump includes entry and outlet ports, an interior cavity, and a flexible diaphragm mounted at the mouth of said cavity and adapted to be flexed by introduction of positive pressure depending upon the flow of fluid into or out of said cavity, the flexing of said diaphragm effecting a pressure applied to said movable member whereby to drive the plunger so that at one end force is applied thereby against the slidable element to translate same between the pair of selected positions. The opposite plunger is forced or otherwise withdrawn from the path of such element at the same time, causing the plunger of the opposite cylinder to assume an initiate condition so as to ready the same in condition for return.
REFERENCES:
patent: 2846121 (1958-08-01), Ronnebeck
patent: 3362228 (1968-01-01), Stuben
patent: 3567389 (1971-03-01), Coulter et al.
patent: 3567390 (1971-03-01), Rothermel
patent: 3615241 (1971-10-01), Low
patent: 3819330 (1974-06-01), Creighton
Coulter Electronics Inc.
Serwin R.E.
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