TOV
Installation, Operation and Maintenance Manual
6
WKM-TOV-IOM
Disc/pipe clearance
Before beginning installation, note the following:
Disc/pipe clearance should be checked before
beginning installation to avoid the possibility of
scraping on the seal ring edge on the pipe I.D. and
damaging
the
sealing
surface.
Chamfer
is
recommended on the pipe flange.
Minimum pipe I.D. required for disc swing clearance:
Class 150 valves - Standard pipe or equivalent
Class 300 valves - Schedule40/XS pipe or equivalent
Class 600 valves - Schedule 100 pipe or equivalent
Consult Table 1 - Disc clearance for required flange
modifications for other pipe schedules (Figure 2).
Table 1
– Disc Clearance
Figure 2: Disc/pipe clearance
Pipe Flange
