17
5 MAINTENANCE
5. 1. Seatring Disassembly/Assembly Procedures
5. 1. 1 Seatring disassembly procedure
For periodic inspection or in case of trouble due to
damage and wear of the Seatring, etc., carry out the
following procedures while referring to the expanded
view.
1) Secure the metal section of the body
①
using a
vice so that the flanges are not damaged. Open the
disc
②
approx. 30°. [Fig.-22]
2) Remove the Hex. socket set screws
on the front
of the Seatring retainer
⑦
. [Fig.-22]
3) Carefully grasp the inner side of the Seatring re-
tainer
⑦
and pull it out toward you by hand. The
ball
⑳
inserted on the outer side of the retainer
may pop out during removal, so care must be taken
not to lose it. [Fig.-22]
4) Remove the Seatring
⑤
from the seat ring retainer
⑦
. [Fig.-22]
5) Thoroughly clean the Seatring mounting faces of
the body
①
and the Seatring retainer
⑦
, and the
disc
②
using a suitable cleaning fluid, such as
alcohol or a neutral detergent. [Fig.-23]
5. 1. 2 Seatring assembly procedure
1) Set the disc
②
to the full-close position. [Fig.-24]
2) Install a new Seatring
⑤
to the Seatring retainer
⑦
. Set the ball
⑳
on the periphery of the Seatring
retainer
⑦
and install it on the body
①
. [Fig.-24]
3) Screw the set screws
into the tap hole provided
on the front face of the Seatring retainer
⑦
. Make
sure that the Hex. socket set screws
is com-
pletely screwed in so that it does not protrude from
the front face of the Seatring retainer
⑦
. [Fig.-25]
[Fig.-25]
4) Open and close the valve to ensure that the seat
ring retainer
⑦
is properly secured to the body.
[Fig.-22]
[Fig.-23]
[Fig.-24]
⑦
Seatring retainer
Hex. socket set screw
⑳
Ball
⑤
Seatring
②
Disc
Hex. socket set screw
⑳
Ball
⑤
Seatring
⑦
Seatring
retainer
②
Disc
①
Body
Hex. socket
set screw
⑳
Ball
Summary of Contents for 304YA
Page 28: ...27 MEMO...
