KRAL DKC Series - Replacing the seal ring of the control plug

12 Servicing
12.6 Replacing the seal ring of the control plug
12.6 Replacing the seal ring of the control plug
Personnel qualification: o Trained personnel
Personal protective equipment: o Work clothing
o Protective gloves
o Protective helmet
o Safety boots
o Face protection
Aids: o Collection tank
o Plastic calibrating mandrel
WARNING
Risk of injury through emitted pumped liquid.
Pumped liquids can be hot, poisonous, combustible and caustic.
► Wear personal protective clothing during all the work. Ensure face protection.
► Collect any discharging pumped liquid safely and dispose of it in an environmentally compatible
manner in accordance with the applicable local regulations.
► If work on the blocked part of the pump station takes longer, monitor the filling level of the strainer
housing and catch the leakage.
WARNING
Risk of injury through emitted pumped liquid when working on the pump station without previ-
ous pressure relief.
► Open the screw plug of the vent hole by a max. of 2 rotations in order to reduce the internal pres-
sure in the housing.
Requirement:
ü Pump station switched off
1. Close the pressure-side and suction-side shut-off devices.
4
3
2
1
2. In order to reduce the inner pressure in the housings open the screw plug if the vent hole4 by a
max. of two rotations and subsequently drain the pump station.
3. Remove the circlip1 and remove the control plug2.
4. Remove the seal ring3 with O-ring from the hole.
Operating instructions
OID 02en-GB Edition 2019-11
43