Adjustable Vacuum Relief Valves

  • Adjustable spring-loaded vacuum relief setting
  • Simple operation - the vacuum relief, or cracking pressure, is simply set by turning the adjusting nut
  • Robust and reliable design – minimal parts count not only leads to lower costs, easier production, and faster assembly but also improved quality and improved dependability and reliability
  • High integrity soft seat seal
  • Corrosion resistant stainless steel components
  • 100% factory acceptance tested - ensures reliable, consistent, leak-tight performance and product integrity


  • Protects vacuum systems
  • Adjustable from 5" to 25" Hg
  • Corrosion resistant stainless steel
  • Various NPT thread options available
  • Various sealing materials available: Buna-N (nitrile), Silicone, Viton, and EPDM



 Body 316 Cres Differential vacuum range 5" to 25" Hg
 Poppet 316 Cres Temperature range to 400°F
 Adjusting Nut Limit 316 Cres
 Jam Nut 316 Cres
 Spring 17-7PH Cres
 O-Ring seal (AS568) Buna-N (others)