Valve Connection To Piping; Top-Mounted Valve Installation - Pentair SIATA V132-SFE-EV-VIRIDION Installer Manual

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Installer Manual Siata V132-SFE-EV-VIRIDION - 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.

Note

See chapter 3.4. Description and components 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.

In addition, 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 be also be installed stretched, avoiding excessive length. For

instance 20 - 40 cm is enough;

•

excessively long and non-stretched flexible piping connection will create stresses on the valve

and tank assembly when the system is pressurized, as illustrated in the below picture: on the left

the assembly when the system is unpressurised, on the right the flexible piping connection when

put under pressure tends to lift up the valve when stretching up. This configuration is even more

dramatic when using semi-flexible piping;

40 / 110

200 mm flexible

Support to the wall

Ref. MKT-IM-009 / C - 08.06.2018

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