Pentair Evolio 255 Series - Page 32

Installer manual Evolio 255 740-760 - Installation
32 / 90 Ref. MKT-IM-037 / D - 25.10.2021
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 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;
• failure to provide enough vertical compensation may lead to different kinds of damage, either
on the valve thread which is connected to the tank, or on the female thread connection of the
tank. In some cases, damage may also be seen on the valve inlet and outlet connections;
• in any case, any failure caused by improper installations and/or piping connections may void
the warranty of Pentair products;