B - Operations – Transporting – 67 – D
Patent
B - Operations, Transporting
67
D
222/9.2
B67D 1/00 (2006.01) G01F 11/00 (2006.01) G01F 11/04 (2006.01)
Patent
CA 1067462
ABSTRACT OF THE DISCLOSURE An apparatus for automatically dispensing a mea- sured volume of liquid. The liquid is fed into a cylinder and displaces a piston which expels quantity of liquid pro- portional to the piston stroke. At the end of the stroke, the piston is made to abut a close a switch which actuates an electric motor driving a four-way rotary valve to reverse the liquid flow direction in the cylinder, whereby the piston moves in the opposite direction to discharge a measured amount of the liquid which was previously used to push the piston. The piston, at the end of its second stroke, again strikes and causes the closing of a second electric switch which produces rotation of the four-way valve to again reverse the liquid flow to its original direction. The back-and-forth movement of the piston can be automatically repeated a predetermined number of times, being governed by an electric counter or any similar electri- cally-operated device. Means are provided to prevent the formation of air pockets in the clyinder, which would affect the measuring precision. The position of the electrical switches can be varied to vary the piston stroke and, therefore, the quantity of the liquid dispensed. As a modification, one or more additional cylinder and piston assemblies are provided with their pistons mechanically connected to the piston of the main cylinder and arranged to dispense two or more liquids in exact proportional amounts. Another embodiment shows a variable volume cylinder to adjust the amount of liquid being dispensed. The four-way valve is leak-proof between the two liquid circuits because its valve member is frusto-conical and is pushed in seating position by a by-pass of the liquid under pressure. The apparatus can measure with great precision liquids of various viscosities and under very low or very high pressure.
286981
Demers Normand
Martin Claude
Demers Normand
Martin Claude
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