APV DELTA DA3+ SLD, Operating Manual

Page: 26 / 45

21
UK
DELTA DA3SLD-UK0.qxp / 12.2007
Double Seat Mixproof Valve with Seat Lift Detection
DELTA DA3+SLD
Operating Manual: Rev. 0
F a i l u r e R e m e d y
13. Trouble Shooting
Leakage at the upper housing flange. replace upper housing seal (35).
Leakage from the leakage bore between
the connecting ports. replace lower housing seal (35) and
seat seals (39).
Leakage from the bore of the spring cylinder (8) .
replace upper shaft seal (36, 37) and
seals in flushing chamber (33, 32).
Liquids leaking from the drain pipe.
To be able to make a detailed diagnosis,
remove the drain pipe (1).
Leakage at the inner side of the
lower valve shaft
(3) .
replace upper seat seal (39).
Leakage at the inner tube of the
lower valve shaft
(3) .
replace upper shaft seal (37, 36).
Leakage at the inner side of the
lower valve shaft
(3) .
replace lower seat seal (39).
Leakage at the inner side of the
lower valve shaft
(3).
replace middle seal (41).
Leakage at the outer side of the
lower valve shaft
(3) .
replace lower shaft seal (37, 36).
Va l ve c l o s e d a n d p r e s s u r e i n t h e u p p e r h o u s i n g
Va l ve c l o s e d a n d p r e s s u r e i n t h e l o we r h o u s i n g
Va l ve p o s i t io n o p e n
W h e n d a m a g e d s e a l s a r e ch a n g e d , g e n e r a l l y a l l s e a l s s h o u l d b e r e p l a c e d .
F o r va l ve s e r vic e a c t io n s A P V s u p p l i e s c o m p l e t e s e a l k i t s
( s e e s p a r e p a r t s l i s t s ) .
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