Flomatic Comboair Installation Instructions

Air Release Valves
Model Comboair® 1" thru 3"
Operation:
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Flomatic Comboair valves are designed to vent large volumes of air while the system is filling and expel
accumulated air while the system is under pressure. Should the system encounter a negative pressure as a
result of a main break for example, it will allow large volumes of air to re-enter the system to prevent the main
from collapsing. The valve has two orifices, a large one for the air and vacuum feature which handles the
large volumes of air and a small one to expel accumulated air. The orifices are closed by a float attached to
a lever arm mechanism that lifts the seat discs as the water rises in the valve. As the air accumulates in the
valve it displaces the water causing the float to drop, allowing the small orifice to expel the air and the water
to rise again closing the valve.
NOTE: These valves are designed for use on clean water systems. Using them on systems other
than water is not recommended. Consult factory for special applications.
Installation:
Installation must be performed by qualified, licensed personnel only.
Remove all plastic protection plugs that are covering inlet and outlet threads.
The Flomatic Comboair
water main. If they are not installed directly over the water main, the inlet piping to the valve should always
be upwards towards the valve with the valve being vertical only. To facilitate servicing and repairs it is
strongly recommended that an isolation valve be installed on the inlet side of the valve. Proper supports for
the valve and piping are required as needed.
These valves should NEVER be buried. In warm climate areas installing them above grade is acceptable as
long as precautions are taken to keep people away from them and protect them from being tampered with
(these precautions should be determined by the project engineer). Freeze protection is a necessity in colder
areas. Manholes should be adequately sized to allow access to the valves by service personnel.
Maintenance:
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The Comboair requires no schedule maintain, but should be inspected periodically for leakage in the orifice
area on top.
Disassembly / Reassembly:
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The Comboair can be disassembled without removing it from the line. No special tools are required and all
working should be performed by qualified, licensed personnel.
1. Close the isolation valve on the inlet of the valve or shut the system down if these are not a
valve. Be sure system pressure is relieved.
2. Remove top flange (#2), bolts (#24) and lift cover off.
3. Examine internal parts for signs of wear or damage.
4. Examine seats (#10 & 15) for damage to rubber or excessive wear.
5. If the air & vacuum seat rubber is damaged, you will need to remove the top (#1) by removing
interference pin (#25) and unscrewing it. Remove and replace the seat and then reassemble
top flange assembly.
6. The air release seat, (#10) is removed by removing plunger nut (#11) and then unscrewing the
plunger. When installing the new plunger screw it in to the same depth as the old one and
then the lift lever arm to see if it meets the seat plate evenly. Adjust as necessary and then re-
install plunger nut.
7. Replace any other parts as needed on the compound linkage mechanism.
8. Clean flange surfaces, use a new flange gasket (#22) and reassemble valve.
9. Put valve back in service and check for leaks.
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should be installed at the high points in the system in a vertical position above the
Flomatic Corp, 15 Pruyn's Island, Glens Falls, New York 12801
Phone: 518-761-9797
Installation Instructions
Fax: 518-761-9798 www.flomatic.com
Flomatic Corporation
Comboair
Rev. C