VAL
S
TEAM
ADCA
Produced in accordance with Sound Engineering Practices of the European PED - Pressure Equipment Directive.
IMI PS130.08 E 00.22
19
9. MAINTENANCE
Before performing a maintenance procedure, refer to section 1 – Safety information.
The product requires maintenance to ensure that it operates correctly and safely
throughout its lifetime. Maintenance work should be performed in a planned manner
at periodic intervals. These intervals must be defined by the operator according to the
service conditions.
9.1. Maintenance procedure
1. Make sure all the necessary materials and tools are readily available during
maintenance work.
2. Perform the shutdown procedure – see section 7 – Shutdown.
3. Perform the maintenance procedure – see the following sections.
4. Put the product back into operation – see section 5 – Start-up.
9.2. Replacing the diaphragms and plug assembly
1. Completely relax the adjustment spring (21) or disconnect control pressure supply.
If the valve is removed from the line, fix the valve body (1) in a vise with soft jaws,
with the cover (2) pointing upwards.
2. Unscrew the cover (2), remove the O-ring (32), if any, and adjustment spring (21).
3.
Remove washer (17) and the diaphragm/plug assembly (5, 6, 12, 15, 16, 18, 19,
20).
4. Thoroughly clean the inside of the valve body (1) and cover (2).
5. Disassemble the diaphragm/plug assembly by holding the plug (5) in a vise and
unscrewing the nut (19).
6. Renew the serrated lock washer (20), upper diaphragm (16), lower diaphragm (15)
and plug assembly (5, 6, 12).
7. Clean reusable parts and reassemble the diaphragm assembly (5, 6, 12, 15, 16,
18, 19, 20). Hold the plug (5) in a vise and tighten the nut (19) until the lower
diaphragm (15) just starts to deform.
8.
Place the diaphragm assembly (5, 6, 12, 15, 16, 18, 19, 20) onto the body (1)
followed by the washer (17). Fit the O-ring (32) if any, and adjustment spring (21).
9.
Apply a suitable lubricant on the cover (2) thread and screw it into the valve body
(1) tightening with the recommended torque – see section 9.3 – Tightening torques.
