Table of Contents
Advertisement
FASANI ASSISTED SWING CHECK VALVE BOLTED BONNET
INSTALLATION AND MAINTENANCE INSTRUCTIONS
HANDLING
During handling operations, valves must be
lifted and handled as indicated in Fig. 1 by using
lifting equipment respecting the carrying limits
(valve weight indicated in the drawings).
Optional eyebolts on the valve body can be used
to lift the valve.
WARNING
• Do not use any lifting equipment that is either
damaged or/and of an inadequate/unknown size.
• Do not use the eyebolt in the bonnet to lift the
valve.
INSTALLATION
For correct operation of the valve, this must
be installed in horizontal position only as
indicated in Fig. 2. Different positions from
those indicated may cause non-correct valve
operation and/or quick deterioration of the
valve.
The following operations must be performed
only immediately before the installation:
1. Remove the protection caps of the end
faces.
2. Remove pin protection.
3. Check the pipeline sections upstream and
downstream. Make sure that there are no
solid particles or any other kind of dirt or
debris inside. If necessary, clean carefully
by using an air line.
4. Verify the flow direction in the line.
WARNING
Verify that the direction of the line corresponds
to the flow direction indicated by the arrow on the
valve body.
Make sure that the materials of construction
listed on the valve nameplates (service and
temperature), are appropriate for the service and
fluid of the plant.
Flanged valves
Place the valve between the two pipe flanges,
and the gasket between the valve's flange
and the pipe's flange. Make sure that it is
positioned in the center. Assemble the valve to
the pipe by tightening the bolts according to the
torques given by the Engineering Company that
designed the plant.
Butt-welding valves
Position the valve and verify its alignment
with the pipe. Proceed with the welding in
accordance with the procedure indicated by the
Engineering Company that designed the plant.
Usually, the first weld layer will be made with
TIG, while following weld layers will be made
with the appropriate electrode for the valve
body material.
Drain connection
Draining connection in the valve body (Fig.4) to
be connected to plant draining system before
putting valve in operation. In case of lack of
draining, condensate retained in the valve
bottom could flash generating pressure peaks
which may damage the valve and/or other
equipments in the plant.
WARNING
Protect eyes with appropriate welding masks or
goggles during all welding operations.
General notes
• Should one end not be connected to the line
for longer than half a day, the open end must
be properly closed and sealed in order to
prevent entry of dirt or debris.
• After the installation of the valve and before
the line testing, it is strongly recommend
cleaning the line in order to remove dirt
and/or foreign bodies that may damage the
tightness between the seat and the disc, and
the correct operation of the valve.
• We strongly recommend checking the torque
of the body-bonnet bolts, especially if the
valve is to operate at high temperatures.
Tightening must be done alternatively on
the bolts that are diametrically opposed, see
Fig. 3. The torque values are those reported
in Table 3.
FIGURE 1 - VALVE LIFTING AND HANDLING
FIGURE 2 - POSITION FOR VALVE INSTALLATION
Flow
FIGURE 3 - TIGHTEN BOLTS - FLANGE
TIGHTENING SEQUENCE
FIGURE 4 - CONNECTION FOR DRAINING
Drain in 'G' position
2
Advertisement
Table of Contents
