公开(公告)号：US20200319064A1

公开(公告)日：2020-10-08

申请号：US16757769

申请日：2018-09-21

Applicant: AVL EMISSION TEST SYSTEMS GMBH

Inventor： SASCHA WILLICH ,  MARCUS WOLFF

IPC: G01N1/22 ,  G01N1/24 ,  F16K7/07

Abstract: An exhaust gas sampling system includes a main conveying line, a main throughput pump which conveys a sample gas in the main conveying line, a first Venturi nozzle, a second Venturi nozzle, a first control valve, and a second control valve. The first Venturi nozzle and the second Venturi nozzle are connected in parallel and are arranged in the main conveying line upstream of the main throughput pump. The first Venturi nozzle is assigned the first control valve. The second Venturi nozzle is assigned the second control valve. Each of the first control valve and the second control valve are provided as a pinch valve. Each pinch valve has a flexible, hose-like control element and a pressure chamber which is filled with a fluid and which is arranged to surround the flexible, hose-like control element.