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INSTALLATION
The installation of the Vacuum Breaker is
important for its proper operation. The seat end
must be oriented upward. The device should be
installed on top of horizontal lines or tanks and
equipped with a full-ported isolation valve.
installed in a vault, adequate ventilation is
needed to supply air to the vacuum breaker.
It leakage occurs at the pipe connection, torque
valve tighter or reapply pipe dope to threaded
joint.
VALVE CONSTRUCTION
The Vacuum Breaker 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 shaft (20)
are the only moving parts assuring long life with
minimal maintenance. The general details of
construction are illustrated in Figure 2. The 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. 1/2"-3" VACUUM BREAKER
ITEM
DESCRIPTION
1
Body
2
Cover
3
Baffle
4
Seat*
5
Float*
If
6
Gasket*
7
Cover Bolt
8
Retaining Screw*
9
Guide Bushing*
14
Pipe Plug
20
Guide Shaft*
21
Spring*
*RECOMMENDED SPARE PART
TABLE 1. 1/2"-3" Vacuum Breaker Parts List
MAINTENANCE
The Vacuum Breaker requires no scheduled
lubrication or maintenance.
TROUBLESHOOTING
Several problems and solutions are presented
below to assist you in troubleshooting the
vacuum breaker assembly in an efficient
manner.
•Leakage
at
threaded connection. If leak persists, remove
device and seal threads with Teflon sealant.
•Leakage at Cover: Tighten bolts, replace
gasket.
•Device Leaks when Closed: Inspect seat for
damage and replace.
DISASSEMBLY
The device can be disassembled without
removing
it
convenience, the device can be removed from
the line.
All work on the valve should be
performed by a skilled mechanic with proper
tools.
WARNING:
2
MATERIAL
Cast Iron
Cast Iron
Ductile Iron
Buna-N
Stainless Steel
Non-Asbestos
Alloy Steel
Stainless Steel
Stainless Steel
Iron
Stainless Steel
Stainless Steel
Bottom
Connection:
from
the
pipeline.
The line must be drained
before removing the cover
or pressure may be
released causing bodily
harm.
Tighten
Or
for
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