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(6) To reinstall the diaphragm, ﬁrst ﬁt a new diaphragm in the diaphragm base groove while aligning

the two diaphragm projections with their counterparts of the diaphragm base. Then, replace the

diaphragm ring in the diaphragm thus ﬁtted. At this time, this diaphragm ring must be a new one

supplied with the replacement diaphragm. (Figs. 11 and 12.)

This completes the diaphragm replacement procedure, and use this assembly as a new

diaphragm mounting block.

• At the time of changing diaphragms, be sure to replace the diaphragm rings also with the supplied

new ones. Since the old diaphragm rings may be likely to break, you may get injured when attemp-

tingto reﬁt them for reuse.

• Be sure to ﬁt the diaphragm ring as pump performance and life will be greatly affected, possibly

resulting in a failure.

Fig. 11

(7) Install a new diaphragm mounting block on one side of the rod, insert the rod in accordance with

the procedure reverse to that performed when the rod was removed from the pump.

• Do not use removed U-lock nut and washer again as they may be loosened, which causes failure

of the pump. Therefore, use new U-lock nut and washer every time for replacing diaphragms

without fail.

CAUTION

Diaphragm base

Projection

Diaphragm

CAUTION

Fig. 12

Diaphragm base

Diaphragm ring

Diaphragm

(Figs. 13 and 14)