Valve Connection To Piping; Top-Mounted Valve Installation - Pentair FLECK 3150 NXT Installer Manual

Installer manual Fleck 3150 NXT/NXT2 - Installation
• valve is designed for minor plumbing misalignments. Do not support weight of
system on the plumbing;
• be sure all soldered pipes are fully cooled before attaching plastic valve to the
plumbing.
5.5

Valve connection to piping

The connections should be hand tightened using PTFE (plumber's tape) on the threads
if using the threaded connection type.
In case of heat welding (metal type connection), the connections should not be made to
the valve when soldering.
Info
See chapter Components description and location [}Page 17] to identify the
connections.
When pressurized, any composite tank will expand both vertically and circumferential.
In order to compensate the vertical expansion, the piping connections to the valve must
be flexible enough to avoid overstress on the valve and tank.
5.5.1

Top-mounted valve installation

The valve and tank should not be supporting any part of the piping weight. This is hence
compulsory to have the piping fixed to a rigid structure (e.g. frame, skid, wall...) so that
the weight of it is not applying any stress on the valve and tank.
• The diagrams above illustrate how the flexible piping connection should be
mounted;
• in order to adequately compensate the tank elongation the flexible tubes must be
installed horizontally;
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Support to the wall
min 200 mm flexible
min 200 mm
flexible
Support to the wall
Ref. MKT-IM-010 / C - 18.10.2019