Unibloc-Pump UNIBLOC-PD Series, Operation & Service Manual

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UNIBLOC-PD Operation & Service Manual: PD200-576 33
4.6.2 Relief Cover Model #B
This type has bi-directional flow. No special orientation has to be adhered to.
Mark the location of the lock ring (2) on the spring adjuster (1). Unscrew the spring
adjuster (1) and remove it. Remove the spring (6). Look for the diaphragm washer (3)
either inside the adjuster or on top of the spring for replacement. Unscrew the dome nuts
(4) on the spring housing (5) and separate the housing (5) from the cover (12). The stem (7)
and disk (8) will now be removable as one unit. It is now possible to replace the diaphragm
(9 & 10). Press back the diaphragm (9&10) on the cover (12) after replacement. Slide
the spring housing (5) back on the cover bolts (11), hold the stem (7) and disk (8) on the
diaphragm (9 & 10) so they stay inside the housing. Fasten the spring housing (5) to the
cover (12) with the dome nuts (4). Place the spring (6) over the stem (7). Make sure you
have the diaphragm washer (3) placed either on top of the spring (6) or inside the spring
adjuster (1). Turn the lock ring (2) back to correct settings on the spring adjuster (1).
Thread the spring adjuster (1) back into the spring housing (5) and tighten. The pump may
now be returned to service.
1
2
4
10
12
9
11