The apertures on the face of the nozzle fixtures in Fig. 3.2 A, C, and D, were dimensioned so that
once the CFVs were installed they are both sealed and held in place by friction. When the nozzle
fixture (with CFVs installed) was mounted in the pipeline, the pressure gradient necessary to
choke the CFVs also added to the integrity of the seal. An illustration of the single CFV nozzle
fixture installed in the appropriate sized pipeline is shown in Fig. 3.3. This figure corresponds to
the Stage 1 calibration setup of the LP CFVs.