Installer Manual Fleck 3900 - NXT - Installation
40 / 126 Ref. MKT-IM-015 / B - 08.06.2018
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.
Note
See chapter 3.3. 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
;
Min 200 mm flexible
Support to the wall
Min 200 mm flexible
Support to the wall
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