Commissioning; Normal Operation And Maintenance - GF DIASTAR Six FC Manual Instrucciones Original

7. Commissioning

Please observe all aforementioned safety and technical information before you start com-
missioning the diaphragm valve!
Diaphragm valve pressure testing is subject to the same regulations as the piping
s ystem; however, the test pressure may not exceed the PN of the diaphragm valve.
Operate the diaphragm valve
NOTICE
Use of higher control pressures or mechnical aids can cause damage to the
diaphragm valve.
• Use mentioned control pressure to actuate the diaphragm valve
Control operations
NOTICE
Due to cavitation the diaphragm valve could be damaged.
• Use valve only at optimal control operation conditions.
Information
Slight hysteresis occurs in the steady state characteristics when the direction of actuati-
on is changed.
Procedure commissioning
• Check that all valves are in the required open or closed position
• Fill the piping system and deaerate completely
• The component with the lowest PN determines the maximum allowable test pressure
in the piping section
• The valves and connections should be checked for a tight seal during the pressure test

8. Normal operation and maintenance

The connection between the bonnet and valve body should be checked for tightness at
regular intervals. Please consider at leakage or other defects the chapter "General safety
information" and additional information in the Planning Fundamentals.
Check functionality regularly
We recommend checking the functionality of diaphragm valves which are kept permanently
opened or closed. This can be done by unseating the diaphragm 1 to 2 times a year.
Safety messages for normal operations and maintenance
Diaphragm valve used as end valve
Medium can exit uncontrollably, if piping system is opened under pressure.
Death or serious injury could occur due to contact with the medium.
Warning
• The end valve may only be opened when the medium can be caught or car-
ried off safely and splashing is prevented by taking appropriate measures.
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