Check Valve Maintenance; Cleaning With Mppc - Microfluidics Microfluidizer LM20 User Manual

Picture 4 - Install Pump Body
3. Obtain the spanner wrench (P/N 16.2102) and wrap it around the 2.75" diameter locknut. Make
sure the wrench tooth is inserted into one of the locknut grooves. Strike the end of the spanner
wrench handle with a rubber head mallet. Two or three strikes may be required to tighten the
locknut. When the locknut cannot rotate any farther it is tight.
4. Re-attach the process piping beneath the pump body.
5. Obtain the reservoir and re-attach it to the check valve body.
6. Re-attach any liquid quench tubing if applicable.
7. Make sure all process tubing, the pump body and reservoir have tight and proper connections.

4.2 Check Valve Maintenance

The Inlet Check Valve is located below the inlet fitting on top of the pump body. Its purpose is to allow
flow into the pump during the suction stroke and to prevent back flow into the reservoir during the power
stroke of the pump. If the pump fails to generate pressure, and there is back flow into the reservoir, then
the check valve should be cleaned. If the material clogging the Check Valve can be dissolved, then use the
appropriate solvent referencing chemical compatibility with the plunger seal.
NOTE: If the optional MPPC kit is purchased try first to clean the check-valve by using the Manual
Priming and Purging Cylinder (MPPC) with a suitable solvent.

4.2.1 Cleaning with MPPC

1. Replace the product reservoir with the MPPC.
2. Open the Prime Relief Valve.
3. Fill MPPC with liquid.
4. Insert the Teflon® plunger into the MPPC.
5. Turn on the pump while applying manual pressure on the MPPC.
6. Shut off the pump before the plunger reaches the bottom of the MPPC.
7. Repeat above steps until product is coming out of Prime Relief Valve with no air bubbles.
MANUAL.LM20 Revision C January 2023 Page 27 of 52