SPX FLOW APV DELTA DA3+ Instruction Manual page 32

APV
APV_DA3+_ATEX_UK-0_022018.indd
Failure
Leakage at the upper housing flange
Leakage from the leakage bore between
the connecting ports
Leakage from the bore of the spring cylinder (8)
Liquids from the drain pipe
Valve closed and pressure in the upper housing
Leakage at the inner side of the
lower valve shaft (3)
Leakage at the inner tube of the
lower valve shaft (3)
Valve closed and pressure in the lower housing
Leakage at the inner side of the
lower valve shaft (3)
Leakage at the outer side of the
lower valve shaft (3)
Open valve position
Leakage from the leakage chamber of the
lower valve shaft
!
When damaged seals are changed, generally all seals should be replaced.
For valve service actions we supply complete seal kits
(see spare parts lists).
27
16. Trouble Shooting
Remedy
Replace upper housing seal (32).
Replace lower housing seal (32) and
seat seals (36).
Replace upper shaft seal (33, 34) and
seals in flushing chamber (29, 30).
To be able to make a detailed diagnosis,
remove the drain pipe (1).
Replace upper seat seal (36).
Replace upper shaft seal (33, 34).
Replace lower seat seal (36).
Replace lower shaft seal (33, 34).
Replace middle seal (38).
UK
Double seat valve
DELTA DA3+ - ATEX
Instruction manual: UK - rev. 0