8
•
Using an adjustable wrench, unthread and remove the outlet check valve housing (8) from the
fluid section (7).
•
Holding the outlet check valve housing (8) upright with tip down, fill the well of this housing with
the fluid that is being dispensed. (A compatible solvent can also be used)
•
Keeping the outlet check valve housing (8) in the upright position, thread the assembly back onto
the fluid section (7) and tighten with an adjustable wrench.
•
Again pressurize the material to be dispensed between at about 10 psi.
•
If possible turn the valve vertical so the dispense tip is pointing up in the air. Note: Hold a cloth
over the dispense tip to catch fluid flow from the tip.
•
Once again cycle the valve several times until the fluid can be seen dispensing from the tip with
some force behind it.
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 cross sectional view for location of parts referenced in the following procedures.
•
Lubricate the packing (5) and o-ring (24) on the MV250 valve every ~200 hrs by placing a few
drops of mineral oil or other light oil inside the packing nut (4).
Note: PVA offers a 2.5cc mineral oil lubrication kit; Part#: B62-0752
.
•
The packing nut (4) may require occasional tightening, as wear occurs in order to prevent leaks
through the packing.
Routine Cleaning and Disassembly
Cleaning and rebuilding the valve will be required from time to time. A spare parts kit, part # MV250-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.
