Disc - Use Parts U77383 & U48728

This replacement disc is a wear component for LMI U-Series chemical metering pumps, functioning as part of the injection check valve assembly that sits at the point where treatment chemical enters the process line. The check valve is what allows chemical to flow forward into the water line during the pump's discharge stroke while preventing process water from flowing backward into the pump, and the disc inside it is central to forming that crucial one-way seal on every stroke the pump makes.

Over time, and with continuous exposure to the chemicals being metered, check valve components naturally harden, swell, crack, or wear out, and when they do the symptoms show up quickly as loss of prime, erratic or inconsistent dosing, or backflow that can damage the pump. Replacing the disc as part of routine, scheduled maintenance restores a crisp, reliable seal and keeps the U-Series pump injecting the correct dose accurately. This particular part is intended to be used together with companion parts U77383 and U48728, so the injection check valve assembly is serviced as a complete, matched set rather than piecemeal.

• Replacement disc for LMI U-Series injection check valve assemblies
• Helps restore a reliable one-way seal at the chemical injection point
• Supports accurate, repeatable chemical dosing on every stroke
• Designed for use together with parts U77383 and U48728
• Genuine LMI-compatible service component
• An economical wear part for routine pump maintenance

Chemical metering pumps are the workhorses of water disinfection and treatment, injecting chlorine, scale inhibitors, pH adjusters, and other chemicals stroke by precise stroke. Because their small soft-sealing components are subjected to constant cycling and chemical attack, these are the parts that wear out first and most often. Keeping replacements like this disc on hand lets service technicians refresh the check valve quickly during scheduled maintenance, avoiding dosing problems and unplanned downtime. Always refer to the pump's service literature for the correct orientation and assembly sequence when installing this part. Servicing the injection check valve as a complete set, rather than replacing only one element, ensures all of the sealing surfaces are refreshed together and helps avoid the frustration of a partial repair that fails again shortly after, which is why keeping the matched components on hand is the most efficient approach to maintaining accurate, reliable chemical injection over the long term.