TEFZEL & PFA LINED DUAL WINDOW SIGHT FLOW INDICATORS MODEL 501

socket or butt weld dual window sight flow indicators

The Chem Flowtronics Model 501, offers a high performance tefzel liner with all the features of our 101/100 models. Rated at 300°F at Full Vacuum. The Model 501 is cost effective and yet maintains a high manufacturing integrity at all levels of the process.



The Chem Flowtronics Model 501, offers a high performance tefzel liner with all the features of our 101/100 models. Rated at 300°F at Full Vacuum. The Model 501 is cost effective and yet maintains a high manufacturing integrity at all levels of the process.

  • All wetted surfaces lined with Tefzel or PFA
  • Tempered borosilicate lens
  • PTFE gaskets
  • Light-weight construction
  • Lap joint rotating flanges for easy installation
  • PFA liner
  • Glass lined - see photo below
  • Stainless steel body and flanges
  • Flapper or rotor
  • Acrylic shields
  • Special face-to-face lengths
  • Larger sizes on request
  • Full ANSI Rating

Additional information/drawings are available in the PDF brochure.


tefzel-pfa-lined-dual-window-model-501-sight-flow-indicator tefzel-501 /mvc-0838 mvc-797S-000