Flowmeter

Abstract

In a flowmeter having a displacement meter (1), a pressure different sensor (3) connected in parallel has a bypass channel (8) which, when the piston (7) is at the maximum travel stop (9) thereof, enables a connection between the inflow and outflow sides (4, 5). A check valve (11) which prevents the return flow from the outflow side to the inflow side (5, 4) and therefore enables a purely pressure-induced return of the piston (7) is arranged in the bypass channel (8).

Description

technical field [0001] The present invention relates to a flow measuring device, the flow measuring device has a volumetric flowmeter, a differential pressure sensor is connected in parallel to the volumetric flowmeter in a bypass line, wherein the motor connected in rotation with the volumetric flowmeter is controlled by The differential pressure determined by the differential pressure sensor between the inflow side and the outflow side of the positive displacement flowmeter is controlled to achieve a constant differential pressure balance, wherein the differential pressure sensor has a free movement in the cylinder area of ​​the bypass line The piston whose deflection due to the pressure difference is determined and used to control the motor of the positive displacement flowmeter, and the bypass line has a bypass channel, when the piston on the outflow side rests on the maximum stroke stop When blocked, the bypass channel releases the communication between the inflow side an...

AI Technical Summary

Problems solved by technology

However, as soon as the piston rests against the stop, the piston is held on the stop by the system pressure, so that in order to return to the neutral position again, the pressure equalization is not enough, but other measures must be taken.

Images