4.6.6 Parts of the non-return valve (P50)
Nozzle nut
Nozzle
Non-return valve
Dosing chamber
Parts of the non-return valve:
The non-return valve requires little or no maintenance. However, if a blockage does occur,
try to clear it first by cleaning the nozzle (see section 4.6.7).
Only when all obvious causes of blockage have been ruled out should you disassemble
and clean the non-return valve. TAKE CARE not to lose any of the small parts.
Coat all parts thoroughly with silicone spray before assembly. Use the supplied spanners to
tighten the nozzle nut.
50