
8
Setting Dispense Volume
•
Once all air is eliminated from the metering chamber, the micrometer adjustment (10) can be used
to set a specific shot volume to be dispensed each cycle.
•
Turning the micrometer adjustment (10) clockwise will decrease the volume of material in each
shot, and turning it counter-clockwise will increase the volume of material in each shot.
Note: If the micrometer adjustment is turned all the way down it will not allow fluid to be dispensed.
•
Once the micrometer adjustment (10) setting is determined, the collar (E) can be turned clockwise
to lock the setting in place.
Note: Refer to Troubleshooting section for any problems.
Periodic Maintenance
Refer to the MV250-LL cross sectional view for location of parts referenced in the following procedures.
•
Lubricate the packing (4) and o-ring (24) on the MV250-LL valve every ~200 hrs by placing a
few drops of mineral oil or other light oil inside the packing nut (3).
Note: PVA offers a 2.5cc mineral oil lubrication kit; Part#: B62-0752
.
•
The packing nut (3) may require occasional tightening, as wear occurs in order to prevent leaks
around the packing.
Routine Cleaning and Disassembly
Cleaning and rebuilding the valve will be required from time to time.
A spare parts kit, part # MV250-LL-SP is available with all the normal wear parts included.
•
Begin disassembly by removing air and fluid pressure from the valve.
•
Remove all pneumatic tubing and fluid delivery fittings, hoses, etc. from the valve.
•
Using the tip of a 3/32" Hex key, loosen the packing nut (3).
•
Using the same 3/32" Hex key, evenly remove the two machine screws (15) that thread into the
fluid body standoffs (7).
Note: During removal that there is a spring (10) forcing the air section away from the fluid section.
•
Pull the air section (red anodized portion) away from the fluid section (stainless steel portion).
•
Clean off the tip of the stainless steel needle (1).
•
From the fluid section of the valve, unthread and remove the packing nut (3), followed by the
packing (4) and o-ring (24).
•
Using an adjustable wrench, unthread and remove the luer adapter (22) from the outlet check valve
housing (6) followed by the washer (18).
•
Using the same adjustable wrench, unthread and remove the outlet check valve housing (6) from
the fluid section (7).