9
TC-003001-10/ Rev 2
END-OF-LINE SERVICE
Threaded style lug valves are recommended for end-of-line or equipment isolation service. To prevent
unintentional removal of the seat retainer while under pressure, the valve must be installed with the seat retainer
against the upstream flange (Figure 12).
GASKETS
Non-asbestos gaskets made in accordance with ASME B16.5 and B16.47 series A, Group 1a and 1b are standard for
the WKM DynaCentric MB High Performance Butterfly Valve.
ASME 16.20 standard spiral wound gaskets may also be used. Slip-in seat retainers provide 100% gasket contact.
The screw heads of bolt-in seat retainers protrude into the gasket surface less than 33%.
FLANGES
Recommended bolt and stud lengths for installation in ASME B16.5 and B16.47 series A flanges are provided in
Table 6.
Seat Retainer
Figure 12
