Page 8 of 10
Copyright © AVK Holding A/S, original version, rev. 10, 30-June-2020
9. Operation and maintenance
9.1. Operation
The complete assembly must be able to move freely and easily up and down between fully
open and fully closed. Make sure all pin joints and linkages are greased and checked for
freedom of movement.
By adding water into the float through the filler cap it is possible to finely adjust the regulated
height of the water surface level.
9.2. Maintenance
Once every month operate the valve a few times all the way between fully open and fully
closed. Check that it shuts completely off when closed.
Once every 6 months clean and lubricate cylinder, pin joints and linkages. Check for wear or
damage and for freedom of operation and movement.
WARNING: Prior to any maintenance work that requires disassembly make sure that the
pressurized line involved is isolated, depressurized and drained before starting any
disassembly. Failure to do so may result in sudden pressure release and subsequent severe
injury or death.
In case the valve does not operate easily check the internals of the valve:
1)
Support float and lever so that the mechanical load is removed from fulcrum- and hinge
pins
2)
Remove split pins from fulcrum- and hinge pins
3)
Remove fulcrum- and hinge pins and lift off lever and float
4)
Remove the fulcrum bracket
5)
Remove piston assembly
6)
Inspect piston O-ring/lip seal and valve main seal for wear, damage, cuts, etc.; replace
if necessary
7)
Check links, fulcrum and hinge pins for wear and replace if necessary
8)
Clean and lubricate seal groove and refit or replace seals
9)
Inspect valve guide and seat ring for damage or scoring from grit, stones or other
debris. Small damages can be smoothed out with a file and emery cloth, but replace
part if cuts are deep
10) Re-assemble piston components; be careful not to damage the piston O-ring/lip seal
11) Make sure the piston can move freely up and down
12) Install piston assembly in the cylinder and fit fulcrum bracket
13) Install lever/float assembly with new split pins
14) Check float for leaks or damage
