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D. Putting out of service and maintenance
1.
Putting out of service
The operating valve must first be shut off hydraulically by proceeding as follows:
•
Slowly close the gate valves before and after the valve
•
Slowly close the ball valves (2A, 2B, 2C).
The valve has now been taken out of operation, and a service can be carried out.
2.
Maintenance and service
2.1 General information
Through our many years of experience with diaphragm valves that are controlled by the flow medium, we
know that our HAWIDOs normally function trouble-free for many years. Regular maintenance is a
precondition for this, however.
Under normal operating conditions, the following should be carried out:
•
The valve should be checked for correct operation once a year (functional check)
•
The dirt trap upstream of the valve and the filter in the control line should be cleaned once a year
•
The inner working components should be checked and worn parts be replaced every four to five
years (maintenance).
Under unusual operating conditions (e.g. with water which contains quantities of suspended matter, very
high pressure reduction, small flow rates etc.), maintenance should be carried out more frequently.
Maintenance sign:
xx stands for the respective year.
2.2 Annual functional checks
Cleaning the dirt trap in the main line
•
Unscrew the lid
•
Clean the filter with a brush or cloth, or replace it
•
Install the filter and screw the lid back on
Cleaning the filter in the control line
•
Unscrew the lid of the filter
•
Clean the filter with a brush or cloth etc., or replace it
•
Re-install the filter and screw the filter lid back on
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