YAMADA DP-20F/P, Maintenance Manual

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4
4. Diaphragm and Center rod
4.1 Removal
▪ Remove the balls or flat valves, valve seats, valve guides,
valve stoppers, etc. (see [3.1 Removal])
▪ Remove the 12 caps (16 caps for DP-38F/
□
) from both sides
of horizontal tie rods. [Fig.4.1]
▪ Unscrew the 12 retainer nuts (16 nuts for DP-38F/
□
) on the
horizontal tie rods. Then, remove the reinforcement plates
and out chambers. [Fig.4.2]
▪ Turn the diaphragms in the directions of the arrows to
separate the diaphragm on one side. [Fig.4.3]
Then, remove O rings (DP-25F/
□
).
▪ Remove the packings and wipers from both sides of the body.
[Fig.4.4]
▪
Hold the middle of the center rod by hand or clamp it with a
vise. Then, turn the diaphragm to separate from the rod.
[Fig.4.5]
＜
NOTE
＞
▪ When using a vise, be very careful not to damage the center
rod.
Fig.4.4
Fig.4.1
Fig.4.2
Fig.4.3
Fig.4.5
Fig.4.4