H2fl ow Controls
FlowVis®
6
Markings, Features, Warnings & Safety
This feature has no functionality relating
to the operation of the FlowVis and is
simply provided as an attribute to be
able to plumb in a drain down pipe and
valve. A typical use for this might be a
roof mounted solar system. Under no
circumstances should this hole be drilled
out when using the valve body with the
FlowVis, as doing so will invalidate the
product warranty.
5.2 Valve Body Feature
On the side of the valve body that is used for the 1.5”, 2”, and 2.5” models, you
may notice the feature shown in Fig.1.4. Note that models with valve bodies
produced aft er mid-2022 as well as all models with tees and saddle clamps do
not possess this feature):
Fig.1.4
5.3 Tygon Tubing
For models FV-3, FV-3-L, FV-4, FV-4-L, FV-6, FV-6-L, FV-8 and FV-8-L, the
Tygon tubing feature (shown Fig.1.5 and Fig.1.6), is installed to assist with initial
air extraction from the FlowVis lid aft er the pump is started. When installing
the lid assembly into the Tee (FV-3, FV-3-L, FV-4 or FV-4-L) or Saddle (FV-6,
FV-6-L, FV-8 or FV-8-L), care should be taken to ensure that the end of the
Tygon tubing is positioned downstream of the FlowVis, i.e., not tucked up inside
the FlowVis lid, Tee or Saddle. This feature creates a venturi eff ect that will cause
a negative pressure at the end of the tubing, thereby expelling air from inside the
lid. For applications using a variable speed pump, it is advisable to initially run
the pump at the highest possible safe speed in order to extract any air in the lid.
Fig.1.5
Fig.1.6
