Hawle HAWIDO 1505, Manual

Page: 11 / 30

-8-
D. Putting out of service and Maintenance
1. Putting out of service
The operating valve must first be hydraulically shut off as follows:
-
Slowly close the gate valves after and before the valve
- Slowly close the ball valves (2A, 2B, 2C)
The valve is taken out of operation and the maintenance can be accomplished.
2. Maintenance and Service
2.1 General
Our long experience with diaphragm valves that are controlled by the flow medium indicates that our
HAWIDOs normally function trouble-free for many years. Regular maintenance is, however, necessary to
ensure continued reliable operation.
Under normal operating conditions, the following should be carried out:
•
Once a year, the valve should be checked for correct operation (function check)
•
Once a year, the filters upstream of the valve and in the control lines should be cleaned
•
Every four or five years, the inner working components should be checked, and worn parts replaced
(maintenance).
Under unusual operating conditions (e.g., with water that contains quantities of suspended matter, high
pressure reduction, small flow rates etc.,) maintenance should be carried out more frequently.
Maintenance label
xx stands for the year.
2.2 Annual checks
Cleaning the strainer in the main supply
•
Unscrew the lid
•
Clean the filter with a brush or cloth, or replace it
•
Refit 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, or replace it
•
Refit the filter mesh and screw the filter lid back on