Emerson Process Management Bristol Series 9110 - Manual (Page 21)

CI-9110 2-3 Installation
shutoff valve allows the supply source to be closed down during maintenance checks
without disturbing other equipment operating on the line.
Figure 2-2 - Regulator Assembly
2.3.2 Moisture in Lines
The Regulator should be installed so that the supply and output lines slope downward and
away. This arrangement allows any condensate trapped in the lines to drain away from the
instrument.