Microsensor MDM7000 Operation Manual page 18

4.3.2 Valve manifold option and description
Various valve manifolds are available, as illustrated below:
Figure 29 Three-valve manifold
The two-valve manifold consists of a shut-off valve (on/off or conducting)
and a drain valve (typically for waste, water, or gas). Its function is to
open or close the pipeline, and during installation, the flow direction of
the applicable medium shall align with the direction indicated by the
arrow on the valve body.
Operating procedures
a) Check all valves to ensure they are closed.
b) To prevent pressure fluctuations, slowly open the shut-off valve
to allow the transmitter to operate normally.
To deactivate, follow the reverse steps.
Three-valve manifold consists of a valve body, two shut-off
Figure 28 Two-valve manifold
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Figure 30 Five-valve manifold