Series 37 Flanged Tideflex Internal Duckbill Check Valve

The Tideflex Series 37 In-Line Duckbill Check Valve is a simple, reliable, cost-effective solution for backflow prevention. The revolutionary design of the 37 is similar to the Series 35, but the Series 37 “bill” does not flare and is designed to be inserted into the downstream pipe and fastened between two mating flanges, eliminating the need for a valve body.

  • Installs between pipe flanges, eliminating valve body.
  • Offers minimal face-to-face dimension—only the thickness of the flange.
  • Features unique, maintenance-free, one-piece elastomer check sleeve design.
  • Eliminates chatter—silent, non-slamming.
  • Closes on entrapped solids.

Materials of Construction

  • Valves are available in pure gum rubber, neoprene, Hypalon®, buna-N, Viton® and EPDM.
  • ANSI Class 125 Flanges, DIN PN6, PN10, PN16.
  • Special coating available.