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In order to avoid valve damage caused by line impurities (swarf-, dirt,
welding residues) the pipeline must be emptied and cleaned before
installation of the valves. Prior to installation, ensure that the valve is in
open position and the valve end protection caps are removed. Check
the sealing surface of flanged valves for damage. In case the valve has
been stored without protection caps, please make sure that the valve is
clean inside. If necessary flush the valve with clean and dry air.
The valves must be installed stress-free in the pipeline. For example,
stress can occur due to misaligned pipelines. Place the valve in the
piping, if needed, by using lifting accessories. Flanges shall be bolted
constantly crosswise. Please consider the stipulated fastening torque of
the gasket manufacturer. Flanges and bolting should be clean. A flange
gasket which is suitable for the application shall be used. Please en-
sure that the valves are properly supported during installation. Normally
the valves can be installed in any position. However, please consider
a support / bearing for heavy actuators if the valve is mounted in a
vertical pipe or the actuator orientation is not on top of the valve / piping
(sideways).
In order to protect the valve’s internal sealing from
overheating, please make sure that there is suffi-
cient cooling if the valve is welded into the pipe
-
line (butt weld / socket weld end valves).
Please check the whole valve for proper operation by repeated
opening and closing before commissioning (<2 strokes per min-
ute). In case of prolonged storage of the valve the breakaway
torque during the first stroke may be higher than usual, after fre-
quent operation the torque will reduce to the normal level.
Please check if the hand lever or the actuator is installed in such
a manner that the valve closes clockwise. When installing multi
way valves (three-way, four-way etc.) please check the port form
and the switching positions in order to avoid incorrect connection
to the piping. The switching positions are shown on the position
