8
Printed in Italy - EE162/0704
15- Maintenance
To maintain a good performance of the system, almost
once a year, an inspection of the valve is recommended.
External inspection
Turn off all power before servicing any part of the
system.
Check the conditions of the terminal board gasket. If
gasket is deteriorated, replace it with a new one.
Check the electrical connections are clean, dry and
correctly tightened.
Check the conditions of pipe connections: cover them
with a soap solution and check for leakages.
Internal inspection
To make an internal inspection of the valve, do the
following:
1. Close ball valve upstream the system.
2. Remove the coil like shown in the section 14.
3. Using an Allen key, remove the screws on the upper
flange, in cross way. The gas in the valve will come
out during this step.
4. Check the hydraulic brake is free of oil leakages
(small leakages are admitted). If it’s necessary,
replace it with a new one.
5. Check the main O-ring and, if it’s necessary, replace
it with a new one.
6. Clean the internal side of the stem with a clean cloth
and compressed air.
7. Remove the spring and blow it with compressed air.
Check the spring is corrosion free. Take attention to
the assembly direction of the spring.
8. Check the wear conditions of the sliding rings and, if
it’s necessary, replace them.
9. Clean the sealing disc assembly with a clean cloth
and compressed air.
10. Check the conditions of the sealing gasket. If gasket
is deteriorated, replace it with a new one.
11. Clean the sealing lip with a clean cloth. Do not use
tools, because a lip damage could result.
12. Remove the filter and blow it with compressed air.
13. Check the O-ring on the top of stem and, if it’s
necessary, replace it.
14.
Reassemble the valve following the inverse
sequence.
To assemble the sliding rings, wind them onto a lower
diameter (ex. Screw driver), then insert them from the
top.
When reassembling, take attention to the correct
position of the sliding rings and spring.
Fig. 8
When the reassembly is finished, verify the correct
sealing between the upper flange and the valve body:
1. Open ball valve to restore pressure into the valve.
2. Apply a soap solution between the upper flange and
the valve body and check for leakages.
3. Remove the soap solution with a clean cloth, before
to reassemble the coil.
WARNING
•
When reassemble, use all gaskets properly.
•
Perform functional test after mounting.
•
All works must be executed by qualified
technicians only and in compliance with local
and national codes.
Cap
O-ring
Stem
Screw
Upper
flange
Main O-ring
Spring
Sliding ring
Plunger
Disc + gasket
Filter
G1/4” plug
Coil assembly
Valve
body
Brake
O-ring