there are several installation notes for butterfly valve
1、Before the installation should check the valve specifications,
pressure, temperature, and corrosion resistant whether meets the use
requirements. Should check whether the parts are damaged or loose.
2、the Valve can be installed on any angle of the pipeline, we should
close then to install is appropriate; when welding the pipe flange,
should use the plate to block the valve sealing mouth to prevent
particles, debris contusion sealing surface, after welding, remove the
valve, cleaning the sealing surface and pipe cavity, and then fixed the
valve.
3、When installation please note that the pressure bearing direction of
the valve closed state, general pipeline valve is installed according to
(Figure 1), pre-pump valve is installed by the (Figure 2).
4、before installation should clean the sealing surface (both ends of the
sealing surface, disc sealing surface, the valve seat sealing surface)
thoroughly, remove dust and dirt.
5、Before the installation should empty test valve, open and close should
be flexible, open and close position should in line with the position
of the pointer instructions.
6、manual operation clockwise is off, counterclockwise is open, after the
pointer direct is in place, it is not allowed to adding force to open
and close the valve.
7、When the valve takes the pressure test, are not allowed to use a
single flange for installation pressure test, you must use dual-flange
installation for the pressure test (see Figure 3). The test pressure
shall comply with standard requirements GB/T13927-92.
8、When fastening bolts should be symmetrical alternating fastening, are not allowed to separate fastening in turns.
9、Before the limit screw leaving factory, it has been adjusted well, not
allowed to be easily adjusted. If configured driving devices are
electric, pneumatic, please read the driving devices instructions.
10、When electric butterfly valve out of factory, it has been adjusted
well of the open and close stroke of control mechanism. In order to
prevent mistakes in the direction of power connection, before the first
power connection, the user should manually open to the semi-open
position, and then jog switch, check the instructions set direction and
the valve opened direction are the same.
11、If you found the valve hoist disorders, you should identify the
reason and repair and exclusion, to prevent adding force methods to
switch valves, causing valve damaged.
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