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DESCRIPTION OF OPERATION (Cont'd)
The only moving parts in the valve are the float
and the float guide. The float guide assures that
the float enters the seat at the optimum angle
and assures that the float will not make contact
with any surface other than the resilient seat
thus assuring long maintenance free life.
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.
venting and drainage should be provided. A full-
ported shut-off valve should be installed below
each valve in the event servicing is required.
VALVE CONSTRUCTION
The Air/Vacuum Valve body and cover are cast
iron. All internal components are stainless steel
with the exception of the valve seat which is
resilient. The float (5) and float guide (20) are
the only moving parts assuring long life with
minimal maintenance.
construction are illustrated in Figure 2.
body (1) is threaded for connection to the
pipeline. The seat (4) is retained in the cast
cover (2). The seat (4) is retained by a baffle
(3).
FIGURE 2. ½"-3" AIR/VACUUM VALVE
A vault with adequate
The general details of
The
Table 1. ½"-3" Air/Vacuum Valve Parts List
Item
Description
1
Body
2
Cover
3
Baffle
4
Seat*
5
Float*
6
Gasket*
7
Cover Bolt
8
Retaining Screw*
9
Guide Bushing*
14
Pipe Plug
20
Guide Shaft*
* Recommended Spare Part
MAINTENANCE
The Air/Vacuum Valve requires no scheduled
lubrication or maintenance.
INSPECTION: Periodic inspection for leakage
can be performed. A manual drain valve can be
installed in the lower drain plug to perform this
operation as shown in Figure 3.
FIGURE 3. INSPECTION PIPING
2
Material
Cast Iron
Cast Iron
Ductile Iron
Buna-N
Stainless Steel
Non-Asbestos
Alloy Steel
Stainless Steel
Stainless Steel
Iron
Stainless Steel
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