Manual
PERMA PURE LLC
Model M8B User’s Manual
Doc. #580: Revision: 000
Page 18 of 22
Appendix C: Perma Pure Sample Pump Maintenance Instructions
Disassembly of head section and service diaphragm
1. Remove head section by unscrewing the four large bolts. A flat-bladed screw driver may be needed to
gently pry the head free of the service diaphragm. If you have Teflon coating on the heads, use
caution not to scratch the surface.
2. The valve body can then be removed by unscrewing the two smaller screws (also accessible on the top
of the head section). This part may be freed by gently tapping on these two screws after they have
been loosened about 3 or 4 turns. When the valve body is removed, check all internal surfaces fro an
accumulation of dirt. The two valve discs can be wiped clean and replaced as long as they appear
unaffected by usage. The valve gasket can be easily removed and should be inspected. As a matter of
good practice, the valve discs and valve gasket should be replaced during any routine maintenance
check of the head section. A once a year routing procedure is recommended.
3. The service diaphragm is secured by the single screw in its center. Remove this screw with a 5/32”
Allen wrench. The diaphragm and its clamping plate should be easily lifted off. Some slight adherence
to the metal may occur if the diaphragm has been in use for a long period.
4. When replacing the service diaphragm, a Teflon washer should be inserted under the head of the
diaphragm cap screw. This is added insurance against small gas leaks through screw heads and may
be essential in vacuum applications where outside air contamination cannot be tolerated. After
tightening the screw, the excess Teflon should be trimmed away.
5. NOTE: When replacing the service diaphragm, be sure the four projection studs of the base casting
are properly located in the four outer holes provided in the diaphragm before the part is clamped in
place. Be sure the diaphragm plate is firmly replaced with its center screw.
Replacement parts:
2PAM-002 Sample pump repair kit, dual head
Item
#
Description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
VALVEBODY
BEARING
CAP
CWEIGHT
CAPACITOR
ECCENTRIC
FAN, BLUE
FAN, WHITE
HEAD STD, SS
PLATE DIAPH.
CONNECTING ROD
TOL. RING
SCREW-HEAD/BASE
SCREW
PLATE SCREW
GROUND SCREW
SCREW
SCREW
SCREEN
SCREW
LOCK WASHER
DISC-VALVE
DIAPHRAGM
GASKET
WASHER