Detection Of Seal Damage - SPX FLOW APV DELTA DE3 Instruction Manual

APV
APV_DE3_UK-7_082017.indd
Failure
Leakage at upper housing flange
Leakage at drain pipe
Leakage at the outside of the lower valve shaft
Valve closed and pressure in upper housing
Leakage from the leakage chamber
of the lower valve shaft
Valve closed and pressure in lower housing
Remove spray connection.
Leakage from the leakage chamber
of the lower valve shaft
Valve open
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 SPX FLOW supplies complete seal kits
(see spare parts lists).
23

16. Detection of seal damage

Remedy
Replace upper shaft seal (24, 25).
Remove the drain pipe (1) to verify the leakage.
Replace lower shaft seal (24, 25).
Replace upper seat seal (28).
Replace lower seat seal (28).
Replace middle seal (28).
UK
Double Seat Valve
DELTA DE3
Instruction manual: UK - rev. 7