Maintenance; Maintenance Schedule; Cleaning; Replacing The Ball Valve - Grundfos 186 Installation And Operating Instructions Manual

8. Maintenance

WARNING
Toxic material
Death or serious personal injury
‐
Cleaning and maintenance must be carried out by
authorised and trained experts.
‐
Observe the material safety data sheets (SDS) of the
handled chemicals.
‐
Wear personal protective equipment when handling
chemicals.
‐
Shut down the whole system before any work at the
system components and lines.
‐
The system must be pressureless.
‐
Separate the whole system from the power supply
before any work at the system components.
‐
Safety installations, which have been disabled during
maintenance, must be enabled again immediately
after maintenance.
‐
Tightly close inlet flanges and outlet flanges to prevent
humidity from getting in.
‐
Check the tightness of the whole system before
recommissioning.
Observe the manuals of the system and all other
components.

8.1 Maintenance schedule

WARNING
Toxic material
Death or serious personal injury
‐
If the ball valve is defective, it must be replaced
immediately for safety reasons.
Before reassembling make sure, that all parts are clean,
dry and undamaged.
• Open and close the ball valve weekly to maintain correct
functioning.
• Check the tightness of the whole system monthly.
• Check the electrical grounding of the whole system according to
local requirements.
Related information
8.3 Replacing the ball valve

8.2 Cleaning

If necessary, clean all product surfaces with a dry and clean cloth.
12

8.3 Replacing the ball valve

5
8
Ball valve, exploded
Pos. Description
1 Upper flange part
2 Screws
3 Coupling sleeve
4 Screws
5 Horizontal screws
6 Lower flange part
7 Ball valve
8 Adjustment pin
1. Remove horizontal screws (5).
2. Take off the servomotor together with upper flange part (1) and
coupling sleeve (3).
3. Remove screws (4).
4. Take off lower flange part (6).
5. Shut down the whole system and make sure, that no residual
gas is in the system and lines.
6. Dismantle the ball valve (7) from the system.
7. Dismantle the handle from the new ball valve, if present.
8. Fix lower flange part (6) on new ball valve (7) with screws (4).
9. Attach coupling sleeve (3) to adjustment pin (8).
10. Place the servomotor with upper flange part (1) on coupling
sleeve (3).
11. Fit both flange parts together and fix them with horizontal
screws (5).
Check the tightness of the entire system.
1
2
3
4
5
6
7