Valve Connection To Piping; Top-Mounted Valve Installation - Pentair FLECK 2910 NXT Installer Manual

Installer manual Fleck 2910 NXT/NXT2 - Installation
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.
Tip
See chapter Components description and location [}Page 18] 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;
• should the flexible piping connection be installed in vertical position, instead of compensating
the elongation, it will create additional stresses on the valve & tank assembly. Therefore this
is to be avoided;
• the flexible piping connection must also be installed stretched, avoiding excessive length. For
instance 20 – 40 cm is enough;
42 / 172
Support to the wall
min 200 mm flexible
min 200 mm
flexible
Support to the wall
Ref. MKT-IM-002 / E - 12.11.2019