Page 2
When the system is drained, the plug will reopen allowing air
to rapidly re-enter the piping system. See Figure 2.
3.
Sizes 6” & 8” Flanged Parts List
INSTALLATION
The installation of the valve is important for its proper operation.
Valves must be installed at the system high points in the vertical
position with the inlet down. For pipeline service, a vault with
freeze protection, adequate screened venting, and drainage
should be provided. During closure, some fluid discharge will
occur so vent lines should extended to an open drain area in
plant services. A shut-off valve should be installed below the
valve in the event servicing is required.
CAUTION
: Always Install valve with “INLET” port
down or flooding will occur.
MAINTENANCE
The Combination Air Valve requires no scheduled lubrication or
maintenance.
INSPECTION: Periodic inspection to verify operation can be per-
formed. A manual drain valve can be installed in the lower drain
plug to plug to perform this operation as shown in Figure 7.
DRAIN
VALVES
INLET SHUT-OFF
VALVE
FIGURE 5. INSPECTION PIPING
With the inlet shut-off valve open, partially open the drain
valve until flow can be heard. If the air valve is working prop-
erly, water should be exhausted from the drain valve. If air
is exhausted, follow steps 2-6.
1.
Close the inlet shut-off valve.
2.
Slowly open the drain valve to allow the fluid in the valve to
drain. If draining is difficult, the valve may be clogged (valve
requires service).
3.
Close the drain valve
4.
Slowly open the inlet shut-off valve to fill the valve with water.
Observe the seating action and verify that the valve closes
without leakage.
5.
If leakage occurs, the valve should be removed and inspect-
ed for water or possible damage from foreign matter.
6.
23
24
25
9
4
26
2
6
8
5
1
15
28
9
19
21
30
8A
4A
28
11
7
12
22
34
18
3
13
17
10
5A
INLET
OUTLET
125 LB. FLG.
or
250 LB. FLG.
Detail No.
1
2
3
4
4a
5
5a
6
7
8
8a
9
10
11
Detail No.
12
13
15
17
18
19
21
22
23
24
25
26
28
30
34
Part Name
Body
Cover
Leverage Frame
Seat
Seat
Float
Float
Gasket
Cover Bolt
Retaining Screw
Retaining Screw
Guide Bushing
Float Arm
Orifice Button
Part Name
Pivot Pin
Retaining Ring
Cushion
Float Retainer
Lock Nut
Link
Locating Pin
Orifice Button Arm
Hood
Hood Retaining Screw
Washer - External
Seat Retaining Sleeve
Pipe Plug
Washer
Lock Washer
