I-751.Europe / European Alarm Check Valve Stations / Installation, Maintenance, and Testing Manual
SECTION VIII
• Troubleshooting
TROUBLESHOOTING – SYSTEM
Problem Possible Cause Solution
The system water pressure gauge is uctuating with the supply
pressure.
The check valve in the bypass line is installed backward. Check the orientation of the bypass check valve. The arrow shall point from
the supply side to the system side.
Debris is present in the bypass check valve. Remove the threaded cap to the check valve, and remove any debris. Verify
that the clapper is free to move.
Water is leaking from the intermediate chamber. Water is getting past the seal. Check the clapper seal and seat for physical damage. Verify that no debris is
present on the clapper seal and seat.
Verify that there is no vacuum in the alarm line. If a vacuum is present in the
alarm line, install the Series 752V Retarding Vent Kit or create some means
of an air break in the alarm line.
There is ow coming from downstream of the valve. Shut o any ow that is coming from downstream of the valve.
A dierential has not been created across the valve. Verify that the bypass line is installed properly.
The water motor gong is not ringing or the ringing is weak. No water is going into the intermediate chamber. Verify that the holes in the valve body seat ring are not plugged.
Verify that the orice from the intermediate chamber to the alarm line is
not plugged.
Water from the alarm line could be leaking out of the restricted orifice/
alarm line drain of another valve.
Verify that there are check valves isolating the alarm line of each valve in
the system.
The wrong restrictor size is installed in the restricted orifice/alarm line
drain.
Verify that the proper restrictor size is installed in the restricted orifice/
alarm line drain. If the proper restrictor size is not installed, refer to the trim
drawing to replace the restrictor with the correct size.
I-751.Europe_26REV_G
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