ALFA LAVAL UNIQUE RV-ST VALVE INSTRUCTION MANUAL—REV 8/21
5 Maintenance
Study the instructions carefully. The items refer to the parts list and service kits section. Handle scrap correctly.
NC = Normally closed.
NO = Normally open.
S
Stteepp 33
M
Moouunnttiinngg pplluugg sseeaall rriinngg w
wiitthh A
Allffaa LLaavvaall pplluugg sseeaall ttooooll
M
Moouunnttiinngg ttooooll ffoorr eellaassttoom
meerr
pplluugg sseeaallss
D
DN
N4400
3388 m
mm
m
D
DN
N5500 -- D
DN
N6655
5511 m
mm
m -- 6633..55 m
mm
m
D
DN
N8800 -- D
DN
N110000
7766..11 m
mm
m -- 110011..66 m
mm
m
2404-0112
9613172901
9613172902
9613172903
Exhaust holes
for screwdriver
ø20 hole
for plug spindle
A
B
C
D
F
E
2404-01
14
1. P
Paarrtt B
B
“Part B” has a small and a large diameter as the tool can be
used for two plug sizes – e.g. plug tool = 9613172902 can be
used for DN50/ISO51 (small) and DN65/ISO63 (large).
“Part B” therefore has to be turned so it matches the plug
size diameter.
2. P
Paarrtt A
A
“Part A” has an upper and lower exhaust hole, as the tool can
be used for two plug sizes – e.g. plug tool = 9613172902.
The upper exhaust hole is for the small plug size e.g.
DN50/ISO51 (small) and the lower exhaust hole is for
DN65/ISO63 (large).
When using a “change-over plug” the ø20 spindle must also
be fitted in “part A” and “part B” (see drawing 2).
When using a “reverse acting plug” the ø20 spindle must only
be fitted in “part A” (see drawing 2).
When using a “standard shut-off plug” the ø20 spindle is only
fitted in “part B” (see drawing 1).
3. Fit the plug spindle in “part B” or “part A”.
Place “part A” onto “part B” and then press “hard” down on
top of “part A”.
Now fit the screwdriver into the exhaust hole and underneath
the plug groove meanwhile keeping the pressure on “part A”.
This should ensure correct removal of air behind the seal
ring. Normally the sound “Psst” can be heard one time (see
drawing 3).
A “drill press” can of course also be used to press down on
“part A”.
4. It is important to release compressed air behind the seal ring.
This is done with a screwdriver and always underneath the
plug as shown (see drawing 4).
A. Part A
B. Part B
C. Plugs
D. O-ring
E. Grease Paralique GTE703
from service kit
F. Screwdriver (no sharp corner)
30
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