DeZurik APCO AVV-1800 Manuel d'instruction - Page 7
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APCO AVV-1800/1800K Dual Body Combination Air Valve
Maintenance
The APCO AVV-1800/1800K Dual Body Combination Air Valve with Optional CSV Surge Check Valve is
automatic in operation and requires very little maintenance. It should always be installed in a vertical
position.
A semi-annual visual inspection for leakage is recommended. A malfunction of the Air/Vacuum Valve
and Air Release Valve can be identified by the seepage of water through the exhaust port, while
malfunction of the Surge Check Valve would be a substantial amount of spillage through the Air/Vacuum
exhaust port during pump start-up. Should a malfunction occur, the following steps should be taken to
repair the valve.
Disassembly Procedure
Air/Vacuum Valve 1-20" (25-500mm) Only
See Figures 2-3 for part identification.
For information regarding 24" (600mm) Air/Vacuum Valves, contact your local DeZURIK sales
representative.
Servicing the Air/Vacuum Valve while the pipeline is under pressure can cause personal
injury or equipment damage. Relieve pipeline pressure or shut off isolation valve before
servicing the Air/Vacuum Valve.
1. Relieve pipeline pressure or shut off isolation valve at inlet to Air/Vacuum Valve before
servicing the Air Valve.
Do not completely remove pipe plugs or cover bolts while the valve is under pressure.
2. Slowly remove pipe plug near inlet of valve body (A1) to relieve internal pressure and to drain
the unit.
3. Check to see if foreign matter or dirt is preventing float (A14) from seating properly against
seat (A6). Clean as necessary.
4. Perform a seat test. Replace pipe plug and slowly fill valve chamber by cracking open
isolation valve on inlet pipe. If seepage persists, repeat Steps 1 and 2 and proceed as
follows:
5. Remove cover bolts (A4) and cover (A2).
6. Remove seat screws (A16/A34) and remove seat (A6) from cover (A2).
7. Inspect seat (A6) and float (A14) seating surfaces for damage. Replace if necessary.
8. Inspect all other parts of the valve such as guide bushings (A26 & A43), bumper (A40), and
float guide (A33) if applicable. Replace if necessary.
June 2019
with CSV Surge Check Valve
Page 7
DeZURIK
D12025