Laboratory air conditioning gas flow measurement unit has throttle in constant cross section tube with semicircular throttle flap halves between pressure sampling points

摘要

A laboratory air conditioning gas flow measurement unit has a throttle in a constant cross section tube (1) with two flat semicircular throttle flap halves (7) moved synchronously by control shafts (5) symmetrically with respect to a central axis (4) in the flow (13) channel with pressure sampling points (11, 12) upstream and downstream.