B - Operations – Transporting – 67 – D
Patent
B - Operations, Transporting
67
D
222/63
B67D 7/64 (2010.01) G01F 11/04 (2006.01)
Patent
CA 1195960
ABSTRACT OF THE DISCLOSURE A device is provided herein for dosing or for pumping a liquid or slurry in a controlled manner. The device has a piston freely recipro- cating in a cylinder. Members are connected to the cylinder on the opposite sides of the path of the piston movement for feeding the liquid or slurry under pressure into the cylinder in order to move the piston or for discharging liquid or slurry from the cylinder by means of the pres- sure of the liquid or slurry directed into the cylinder to the opposite side of the piston, when the piston returns. A valve is disposed in each of the feed and discharge members of the liquid or slurry for their alter- nate opening and closing. Switches are fitted at the ends of the cylinder for sensing the position of the piston. Finally a control unit is provided for controlling the stroke frequency of the piston, and thereby the volume flow of the liquid or slurry, and for transmitting the signal given by the switch to the valve member in order to open and close it at different positions of the piston. According to the invention, the con- trol unit is fitted to adjust the time interval between the starts of the piston movement. Thus the stroke frequency of the piston and the volume flow of the liquid or slurry remain constant in spite of variations in the feed pressure and viscosity of the liquid or slurry.
418843
Borden Ladner Gervais Llp
Kemira Oy
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