•Are of the
ball and
socket design.
•These
are self-adjusting and self
aligning to both
seating surfaces.
•The
disk is free to
adjust itself
to the seating surface if one-half of the disk is slightly out of alignment because of
foreign matter
lodged between
the disk half and the seat ring.
•suitable
for handling noncondensing
gases and
liquids at normal temperatures, particularly corrosive liquids.
• should
be
installed with the
stem in
the vertical position
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