The screen is to be cleaned at regular intervals depending on the level of soiling caused by the respective medium. The strainers require no further maintenance.
Step 1: Shutting off the system
Whenever maintenance and cleaning measures are being carried out, the shut-off devices at the front and back of the strainer must be closed. This is to prevent the continued flow of the medium and to establish a pressure-free environment.
Step 2: Emptying the strainer
Caution: In order to carry out this work, the system must be entirely pressure-free!
Loosen the flat head cover with a suitable instrument. Carefully screw out the flat head cover and have a suitable container at the ready in order to catch any liquid that escapes.
Step 3: Removing flange cover
Loosen the bolts on the flange cover with a suitable instrument. Please take care to loosen and to screw out the nuts in a crosswise manner in order to prevent the cover from tilting.
Once all the nuts have been removed from the screws, you can remove the cover from underneath. Here too, you will need to have a suitable container at the ready in order to catch any remaining fluids.
Step 4: Removing the screen
Once the cover has been removed and the residual liquid has come out, you can remove the screen by also pulling it out from under the strainer.
Step 5: Cleaning screen and checking for damage
Depending on the medium, remove the dirt and deposits using water, a special cleaning liquid or a brush. In doing so, please adhere to your company regulations with regard to environmental protection and safety!
Following the cleaning procedure, check the screen for any damage.
Should you discover holes or other damage in the screen, then you will need to replace the screen! Only faultless screens can be re-fitted following cleaning.
Step 6: Fitting the screen
Carefully slot the screen back into the strainer from below.
Remove the cover seal from the cover in order to visually check it before fitting.
Step 7: Checking and fitting cover seal
Should the cover seal show any signs of damage, then it must be replaced. Only an entirely defect-free cover seal can guarantee that the strainer is reliably sealed.
If the cover seal is undamaged, then refit the respective nut in the strainer – not the cover!
Step 8: Fitting and screwing flange cover tight
Place the flange cover back onto the strainer and screw the nuts crosswise onto the screw thread. Finally, screw the nuts (crosswise) using the torque prescribed (50 Nm).
Make sure to remember to properly replace the flat head cover onto the lid!
Step 9: Commissioning the system
Following successful completion of cleaning / maintenance measures, you can restart your system by slowly opening the shut-off valves.