FIELD: measurement of flow rate of gas in oil and gas industries. SUBSTANCE: holder with diaphragm is installed in through groove of body closed by covers from above and from below. Upper part of holder has shoes and bearing pads are made in body to accommodate them. Side walls of holder carry key inserts contacting side walls of groove. Rack-and-gear drive is used to remove holder with diaphragm out of body. EFFECT: high precision of diaphragm centering with simultaneous reduction of time for its mounting and dismantling. 5 dwg
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