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FASANI BOLTED BONNET CHECK VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS
Flow
FIGURE 2
Installation positions recommended
Installation instructions
Check valves are normally installed in horizontal
pipe, but can also be installed in vertical pipe
with upward flow (not for piston check).
For a correct operation, Fasani recommends
that the valve shall be installed and oriented
following the indications of figure 2.
This can help minimize any problem associated
with solid particles present in the fluid that
otherwise could deposit in the lower part of
the body and be obstacle to the disc complete
closure. Different positions from those indicated
may cause a non-correct valve operation, and/
or a quick deterioration of the valve.
Unless otherwise recommended by Fasani, the
valve should be installed with the disc in the
closed position, to ensure that the seat ring in
the disc is not damaged during installation.
For operating temperatures above 200°C
(392°F) thermal insulation of the valve body is
recommended.
Handling and lifting of the valves during
installation MUST be performed following
the same criteria and instructions described
in previous points "Handling Requirements"
(page 1) and "Storage and Preservation before
Installation" (page 2).
Buttweld valves
Position the valve and check the alignment
with the pipe, then proceed with welding,
in accordance with the applicable welding
procedure.
Flanged valves
Place the valve between the two flanges of the
pipe and put the seal gasket between the valve
flange and the pipe flange; make sure that it is
correctly positioned. Then assemble the valve
to the pipe by the bolts which will be tightened
crossing. Progressively reach the requested
torque value indicated by the Engineering
Company that designed the plant.
Piston check
IMPORTANT
After the valves installation and before the line
testing, it is recommended to perform an accurate
cleaning of the lines to eliminate dirt and any
foreign objects that could seriously jeopardize
the tightness between seat/disc and the correct
operation of the valve.
After the valve installation on the line and
before the line pressurization, the following
activities must be performed:
- all the threads plugs tightening shall be
verified
- the torque of the body-bonnet bolts shall be
verified.
See Table 1 (Bolt Torque Figures for Body-
Bonnet Flanged Connections)
Swing check and tilting disc
3
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