FIELD: chemical and microbiology industry. SUBSTANCE: diaphragm mounted inside the housing defines hydraulically driving and working chambers. The surge tank filled with hydraulically driving fluid is connected with hydraulically driving chamber through valves. One of the valves is made up as a control delivery valve and the other one is made up as a suction valve. The valves are connected with the surge tank through common passage provided in the housing. A gate, which is rigidly coupled with the float, is pivotally secured at the outlet of the housing inside the surge tank. EFFECT: heightened accuracy of batching. 1 dwg
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