Magnum Venus Plastech Megaject MKIV Revision 1_6 - Manual (Page 29)

Megaject MK V Issue 1_6 Page 29 of 41
Servicing Injection Head (Epoxy)
See drawing 22018
Note: During maintenance ensure resin and catalyst recirculation valves are in the
recirculate position. Avoid any cross contact of resins and/or catalyst.
Procedure
1. Remove air signal and solvent lines from the head. Using a 5mm allen key,
remove head block bolts. Split head into two sections. Remove head block O ring.
To remove NRV 3, (polyester option only) first remove spring retaining pin at top
of valve. Screw M10 bolt partially into the valve and pull to remove from head.
2. NRV 7’s may be unscrewed.
3. To remove NRV 4, (polyester option only) undo catalyst pipe swage fittings.
Unscrew 3 way ball valve from NRV 4. Unscrew NRV 4 from bottom head block.
4. Inspect all head block and NRV galleries. If hardened resin is evident, remove or
replace parts as necessary.
5. To disassemble all NRV’s, remove spring retaining pin. PTFE cone can be
replaced by removing spring from seat retainer.
6. When using a new PTFE cone, grind into NRV seat using thumb pressure only to
ensure a good seal. On reassembly a suitable hook must be used to stretch the
spring sufficiently to enable the retaining pin to be replaced.
7. Reassembly is a reversal of above procedures. Inspect head block O ring and
replace if necessary using a small amount of silicon grease to lubricate.
8. After reconnection of hoses and pipes, machine must be recirculated to expel air.
Note: We highly recommend catalyst and resin pipes are not removed from the recirculation
valves as leakage is inevitable.