DOSING PUMP Drawing Figure
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r 16 for dosing agent comprises a flexible bag 17 containing the dosing agent and being supported by a supporting container 18. The supporting container comprises venting holes 19. The conduits 41 and 43 are tightly connected with the interior of the flexible bag 17. In this manner there is formed a bacteria-tight connection between the conduits 41, 43 and the container for dosing agent, since no venting of the dosing agent is required. In particular for not fumigating dosing agents also a conventional container for dosing agent may be used, which is entered by air corresponding to the amount of dosing agent removed by suction. A bacteria filter may be provided in the venting hole in order to allow disinfected air to enter the container. Directly at the outlet 3 there is provided a pressure valve 20 being formed as a spring-biased ball valve in the embodiment shown. The pressure valve is connected with a connecting conduit 23 leading to a dosing point 22. The pressure valve 20 is provided as close as possible at the pump cylinder and preferably directly at the outlet thereof. An approximately horizontally formed conduit section 48 ending in the upper portion of a sump 27 branches off from the section 47 of the suction conduit 41 connecting the container 16 for dosing agent with the suction valve 42 before the suction valve 42. At its bottom 28 positioned below in vertical direction the pump cylinder 2 comprises an opening 29 leading into the interior of the sump 27 via a suction valve 30 directly adjacent to the opening 29 and a suction conduit 31. The suction conduit extends nearly down to the bottom of the sump. As shown in the FIGURE the diaphragm 11 is connected with the dosing piston, for example by means of a fastening washer 32 such that the diaphragm is displaced by the upward and downward movement, resp., of the dosing piston. At the displacement of the diaphragm 11 upwardly from the lower dead centre in the first stroke the air within the suction system is sucked off and thereby the dosing agent is delivered from the flexible bag 17 into the predelivery chamber 9. With the lifting of the diaphragm 11 the dosing piston 4 is emerged from the pump cylinder 2 such that a part of the delivered dosing agent completely covers the pump cylinder 2 and an excess 32' of dosing agent remains within the predelivery chamber 9. The dosing is performed at the downward movement of pump piston 4 and diaphragm 11 and the major part of the dosing agent s