PSM04-20 Rev -, Effective Date: 08/27/20
Viton®, Krytox®are registered trademarks of Dupont Corp.
Norman Filter Company
9850 S. Industrial Drive • Bridgeview, Illinois 60455
Phone: 708-233-5521 • Fax: 708-430-55961
3.0a 4300/4400 SERIES FILTER ELEMENT CLEANING
3.1a Stainless steel Filter Elements may be cleaned as follows:
3.2a Remove rough external dirt in a separate container with cleaning fluid. Acceptable
cleaning fluids can be but are not limited to acetone or mineral spirits.
3.3a Soak the filter for thirty minutes in unsoiled, high-quality cleaning fluid.
3.4a Following the soak, blow through the element (150 psi max.) from inside to outside with
clean compressed air or similar clean gas.
3.5a Remove any remaining water particles by dipping the filter in isopropyl alcohol.
3.6a Inspect element for uniform pleats. If there is any visible damage, the Filter Element is a
non-conforming product and requires replacement.
4.0a 4300/4400 FILTER HOUSING PLUG CLEANING
4.1a Assess thread and seal areas for physical damage, inspecting areas in full. The threads
should look shiny and smooth with no denting or galled areas and the seal area should
have no scratches or dents. If there is any physical damage to either area the Filter
Housing Plug should be replaced.
4.2a Clean using an acceptable cleaning fluid and a fine bristle brush. Acceptable cleaning
fluids can be but are not limited to acetone or mineral spirits. Move the brush in a
counterclockwise direction from the seal area to the end of the thread run. This is
repeated until all lubricants and fluids that entrap debris to the thread and seal area
surfaces are removed. With a clean air source, blow off any debris.
4.3a Re-inspect the threaded and seal areas again, as above, this time looking for debris as
well. If the inspection identifies debris in the threaded area, repeat the cleaning above.
4.5a Visually inspect for the presence of a flow arrow marking and heat numbers on the Filter
Housing Plug. If either is missing the part is a non-conforming product.
5.0a 4300/4400 FILTER HOUSING CASE CLEANING
5.1a Assess thread and seal areas. The threads should look shiny and smooth with no denting
or galled areas and the seal area should have no scratches or dents. If there is any
physical damage to either area the Filter Housing Case should be replaced.
5.2a Clean using an acceptable cleaning fluid and a fine bristle brush. Acceptable cleaning
fluids can be but are not limited to acetone or mineral spirits. Move the brush in a
counterclockwise direction from the seal area to the end of the thread run. This is
repeated until all lubricants and fluids that entrap debris to the thread and seal area
surfaces are removed. With a clean air source, blow off any debris.
5.3a Re-inspect the threaded and seal areas again, as above, this time looking for debris as
well. If the inspection identifies debris in the threaded area, repeat the cleaning above.
5.4a Visually inspect Filter Housing Case threads. If there is any visible damage, the part is a
non-conforming product.
5.5a Visually inspect for the presence of a flow arrow marking and heat numbers on Filter
Housing Case. If either is missing the assembly is a non-conforming product.
