9
IOM D-070-P
3. OPERATION
When the system is charged and the pipeline begins to fill with water, air flows in the pipeline and enters into the
dynamic air valve, raising the rolling diaphragm sealing assembly to the open position.
Air is then discharged, mainly through the large orifice as well as small amounts of air released through the pilot
orifice. When the ensuing water enters the dynamic air valve, it fills the lower chamber and some of it flows up and
enters into the pilot, raising the pilot float which raises the sealing mechanism to its sealed position. Pressure
develops inside the pilot, bringing about a controlled lowering of the rolling diaphragm sealing assembly, which, in
turn, seals the large orifice.
3.
TROUBLESHOOTING
PROBLEM
REASON
SOLUTION
Leakage from the
Discharge Outlet
A. Debris or scale buildup on the
Rolling Seal (Number [5] on
the BOM table).
B. Torn Rolling Seal.
Follow instructions in the Maintenance of the Pilot
section of this document.
A. Debris or foreign object caught
in the Rolling Diaphragm
Sealing Assembly (Number [9]
on the BOM table).
Follow instructions in the Maintenance of the
Dynamic Valve Body section of this document.
A. Torn Sealing Assembly or
Diaphragm
Follow instructions in the Maintenance of the
Dynamic Valve Body section of this document.