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the use of additional leverage when turning the wheel is prohibited
the closing cannot exceed the value of "0 -0" on the wheel
–
operation of installed valves can be checked by repeated opening and closing
To ensure the safe operation of each valve, especially of the ones that are rarely used, they should be
regularly monitored. Inspection frequency should be determined by the user.
8. MAINTENANCE AND REPAIR
The balancing valves fig. 221 do not require any maintenance provided that they are used in accordance with
their intended use.
Before taking up any maintenance actions, make sure the flow of medium in the pipeline was cut off, the
pressure was reduced to ambient pressure, medium was removed and the system was cooled down.
–
all maintenance and repair work should be performed by qualified personnel using suitable tools and
original spare parts.
–
during maintenance and servicing use personal protective equipment appropriate to the risk involved,
–
after removing the valve, replace the seals with which the valve is connected to the pipeline system,
–
each time when the cover is removed, clean the valve sealing surface and apply new gasket of the same type
as previously used
–
tightening the cover to the body must be made with the valve opened (disc in the upper position)
– before reassembling the valve in the pipeline it is necessary to check valve operation and tightness of all
connections. Tightness test should be carried out with water pressure of 1,5 x nominal pressure of the valve.
9. VALVE SETTING Fig. 221
The valve opening degree can be read on the dial and its lateral part
Number of turns between the closed and fully open positions is: – 4
Locking the setting
–
for the proper adjustment of valve opening tables and flow charts drawn up for each valve size should be used,
So adjusted balancing valve can be closed many times now, but its opening is only possible to the set value.
