Maintenance; Service And Maintenance Of Atex Equipment - Nederman TAV 100 Manual De Instrucciones

8.4

Maintenance

For service and technical support, please contact AB Ph. Nederman & Co.
WARNING!
Risk of personal injury.
• Disconnect voltage prior to service.
• The compressed air supply must be disconnected and any remaining
pressure in the valve and pneumatic cylinders discharged before
commencing any maintenance work to the valve. A shut off valve before
each TAV valve is recommended.
• The compressed air supply to the TAV valve must be dry and clean
(according to standard ISO 8573-1 class 5). Dirt may result in malfunction
by clogging the control device and the restrictor valves. Installing an air
filter may be necessary if clogging occurs.
• Make sure the inside of the valve and the connection pipes are free
from deposits. Build up of deposits inside the piping system may cause
discharge of static electricity.
•
Make sure the outside of the TAV valve, and particularly the solenoid, are
free from dust layers.
•
Oily and sticky substances can sometimes stick to the valve blade
resulting in jamming so that the valve does not close completely. The
valve must then be dismantled for cleaning.
• The backup rings of chloroprene are resistant to most substances in
reasonable quantities. Oil in a large quantity can cause swelling to the
rings resulting in jamming. In extreme situations it may prove necessary
to change to viton rings, which are resistant to most substances. Please
consult the spare part list.
• After a few thousand operations the sealing rings and the back-up rings
should be exchanged in order to avoid leakage
8.5

Service and Maintenance of ATEX equipment

To ensure the required level of protection with regards to the equipment
category, check the following points:
•
Ensure that the TAV valve is regularly inspected for damage or
malfunction. If the valve is damaged it must be replaced or removed
immediately from the classified area.
• Ensure that no explosive atmosphere and/or dust layers are present
when cleaning, servicing or inspecting the TAV valve.
• Ensure that only original (OEM) spare parts are used.
• Ensure that the TAV valve is not covered with thick dust layers (> 5 mm).
This is prevented by setting up routines for regular cleaning and including
these in the explosion protection document.
TAV 100/150 EN
17