Val-Matic 2-42 Flanged Vacuum Breaker - Manual (Page 6)

5
VALVE CONSTRUCTION
The standard vacuum breaker body (1) is
constructed of cast iron. See the specific Materials
List submitted for the order if other than standard
iron construction. The internal metal components
are bronze or stainless steel. The disc (3) and
spring (4) are the only moving parts and require no
maintenance or lubrication. The general details of
construction are illustrated in Figure 4.
The body (1) is flanged to connect to a pipe flange.
The seat (2) is retained in the body (1) with screws
(6) to allow assembly in the pipeline. 2-1/2” and
smaller valves have a threaded seat and no seat
screws (6). The screws will not retain the seat
against full pressure so the ring flange (10) must be
kept connected to the valve at all times. Do not
remove the ring flange while the pipeline is under
pressure or the seat (2) may become dislodged from
the body.
FIGURE 4. FLANGED VACUUM BREAKER
TABLE 2. PARTS LIST
MAINTENANCE
Vacuum Breakers require no scheduled lubrication.
MAINTENANCE: consists of keeping the outlet free
from debris on an annual basis.
INSPECTION: Periodic inspection for leakage can
be performed by inspecting the top of the valve for
accumulation of fluid. If leakage is heard, close the
isolation valve, drain the vacuum breaker
connection, remove the vacuum breaker, and
inspect the seating surfaces for wear or mineral
deposits. Clean, or repair trim as needed.
WARNING: Removal of ring flange without
draining the pipeline may cause
injury or damage to the valve.
ITEM DESCRIPTION MATERIAL
1 Body Cast Iron
2 Seat* Bronze or SS
3 Disc* Bronze or SS
(with Buna-N)
4 Spring* Stainless Steel
5 Bushing* Bronze
6 Screw*
Stainless Steel
8 Gasket* Non-asbestos
10 Ring Plate Steel
11 Fastener Plated Steel
*Recommended Spare Part