Patent ID: 7905142
Filing Date: 2011-03-15
Classification: G01F

Abstract:
1. A servo type volumetric flowmeter employing a pump unit system, comprising a pump unit formed by providing inside a pump portion casing a pump portion having a first rotor and a second rotor having rotation shafts and a measuring chamber formed so as to surround the first rotor and the second rotor, wherein the pump unit has with one of the rotor shafts extending to an exterior of the pump portion casing as a drive shaft, wherein the servo type volumetric flowmeter with the pump unit further includes wherein, due to a presence of the pressure guide port, both inner and outer surfaces of the pump unit, which is accommodated in the unit accommodating recess and covered with the cover member, are kept wet, with the fluid pressures applied to inner and outer sides of the pump unit being equalized.