Combination Air Valves
(Single Body Type)
Detail No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
29
30
34
Part Name
Body
Cover
Baffle
Seat
Float
Gasket
Cover Bolt
Retaining Screw
Guide Bushing
Float Arm
Orifice Button
Pivot Pin
Retaining Ring
Pipe Plug
Cushion
Plug
Float Retainer
Lock Nut
Cushion Retainer
Washer (internal)
Washer (external)
INTRODUCTION
This manual will provide you with the information to properly
install and maintain this valve to ensure a long service life. The
valve has been designed with stainless steel trim to give years of
trouble-free operation. The Combination Air Valve is typically
mounted at the high points in a piping system and performs the
functions of both an air release valve and air/vacuum valve.
The Combination Air Valve automatically vents air which accu-
mulates at high points in a system during its operation. The valve
will also exhaust and admit large quantities (volumes) of air dur-
ing filling or draining operations and after emergency conditions
such as a power failure. Both the air release and air/vacuum
functions are needed to maintain pipeline efficiency while provid-
ing protection from adverse pressure conditions.
The valve is a float-operated, resilient-seated valve designed to
handle fluids having minimal suspended solids. The Maximum
Working Pressure and Model No. are stamped on the nameplate
for reference.
RECEIVING AND STORAGE
Inspect valves upon receipt for damage in shipment. Handle all
valves carefully without dropping. Valves should remain boxed,
clean and dry until installed to prevent weather related damage.
For long term storage greater than six months, the valves must
remain in the box and stored indoors. Do not expose valves to
sunlight or ozone for any extended periods.
DESCRIPTION OF OPERATION
The Combination Air Valve is fully automatic and designed to
continuously remove air accumulating at high points in a piping
system. It also will exhaust and admit air during filing and drain-
ing of the pipeline or tank. The valve, as shipped, is a normally
open valve and has three functions.
During System start-up, the open valve will exhaust large
quantities of air until fluid enters the valve. The float will then
rise and press the orifice button located in the float arm,
against the plug stem and raise the plug. Pressure within the
valve body will force the plug upward tightly against the seat.
When system is drained the plug will open allowing air to
reenter the system.
1.
Figure 1. Custom Combination Air Valve
Figure 2.
Air Exhausted and Air
Intake During Pipeline
Fill and Drain.
As air accumulates in the piping system and enters the
valve, the float drops and the orifice button breaks contact
with the plug stem. Accumulated air will vent through the
plug stem. As the air is vented, the float raises once again
and closes the plug stem orifice. See Figure 2.
2.
INLET
Figure 3.
Accumulated Air
Continuously
Released
INLET
INSTALLATION / OPERATION / MAINTENANCE
Series
36
9
7
2
6
4
16
3
9
12
13
10
18
5
15
1
WORKING PRESSURE - 300 P.S.I.
TEST PRESSURE - 450 P.S.I.
14
8
11
17
29
30
34
18
14
FOR ILLUSTRATION ONLY
SPOKE SHOWN 90…
FROM ACTUAL ANGLE
34
Sizes 1” - 4” Threaded Inlet
