Dosing pump
AssigneeKNF Flodos AG
InventorsErwin Bolt, Traugott Durrer
Life of this patent
Estimating the term…
Abstract
A diaphragm dosing pump (1) has a rotary driving motor (3) electrically connected to control electronics (4). The motor is controlled in such a way that at the beginning and end of each dosing operation the driven diaphragm preferably always takes the same starting position, in particular a bottom dead center position. In order to achieve a reliable sealing behavior of the inlet and outlet valves even during slow working strokes and when the pressure difference between suction and compression sides is small, the valves are designed with elastic valve disks mounted without stress between their valve seat and an opposite rib-like stop.
Claims14
A diaphragm dosing pump comprising a rotary driving motor which rotates in one direction for a working diaphragm and a pump head with an inlet valve and an outlet valve, the rotary driving motor (3) is electrically connected to control electronics (4), the control electronics and the motor are designed for operation with a predeterminable starting position of the driven working diaphragm (6) at a beginning and end of each dosing operation, the inlet and outlet valves are designed with elastic valve disks (19) which in closed position have one face lying upon an opening edge (24) which forms a valve seat Qf an inflow passage (25), the elastic valve disks being mounted stress-free in the closed position, on a valve disc-side facing away from the inflow passage, within a projected extension of the inflow passage, a rib-like stop (28) is provided supporting the valve disc at least in an open position of the valve, and the valves in each case comprise complete, interchangeable units and are in a form of valve inserts (21) including a stop plate (18) presenting the stop (28) and an outflow passage (31) and further including a valve mounting plate (20) and the valve disc (19).
Dependencies are inferred from the claim text.