12
APV_SI2_UK-6_012019.indd
UK
Safety Valve
DELTA SI2
Instruction manual UK-rev. 6
APV
12. Trouble Shooting
Failure
Remedy
Operating position: closed
Leakage at the discharge side.
Replace seat ring (3).
Check control of seat lift actuator.
Leakage between housing flange and
flange of spring cylinder.
Check housing seal (7) and shaft seal (34),
replace damaged seal.
Seat lift cylinder does not work
Check whether ring (19, 41) is stuck.
Replace piston seal (15).
Valve feedback does not work or is unprecise.
Carry out fine adjustment.
Check whether ring (19, 41) is stuck.
The item numbers comply with the spare parts lists. The
replacement of seals must be carried out
according to Service Instructions (see chapter 11).
! If damaged seals are replaced, generally all seals should be
changed. Complete seal kits for the valve service are available
(see spare parts lists).
13. Spare Parts Lists
The reference numbers of the spare parts for the different valve
designs and sizes are included in the attached spare parts drawings
with corresponding lists.
Please indicate the following data to place an order for spare parts:
- number of required parts
- reference number
- designation.
Data are subject to change
