Orifice measuring sections are throttle devices with a replaceable measuring module, provided with inlet and outlet sections. It can be manufactured as a standard orifice according to ISO 5167 part 2, a quarter circle nozzle or as a double cone orifice according to the corresponding operating conditions. In special cases it is possible to use standard venturi nozzles according to ISO 5167 part 3. The measuring module and, if necessary, its carrier-rings are sealed by a flat seal. The seal is precisely adapted to the medium and the operating conditions. The measuring sections are delivered completely mounted and ready for installation, either for flanging or welding.
Particularly with small pipes the measuring accuracy is influenced by installation faults. This can be avoided, if the inlet and outlet tubes form a unity with the carrier-rings on the measuring section and they are moved up to the orifice without obstruction. A centrical position of the measuring module is reached. This guarantees for the prescribed, trouble-free inlet and outlet lengths.