Reliable Protection of Vacuum Systems from Pressures > 1.5 Bar

The main requirement of a modern pressure relief valve is its reliable and precise acting relief trigger. The 21.2 relief trigger is driven by a high durability pressure spring that is laid-out for extended lifetime. The trigger is calibrated to open the valve at a pressure of 1.2 to 1.5 bar. Its operating range is set between 1 x 10-8 mbar and 1.2 bar with a gas flow of max. 6 l/min.

Tested in thousands of demanding applications under various process conditions, the 21.2 series has proven its outstanding reliability.


The 21.2 Pressure Relief Valve is available in DN 16mm (5/8“). The valve body is made of stainless steel. The standard flange is ISO-KF. Its bakeout temperature is ≤ 150 °C.

Key features of the 21.2 Pressure Relief Valve


  • Vacuum system protection > 1.5 bar
  • Trigger calibrated to open valve at 1.2 to 1.5 bar


  • Extended lifetime
  • Precise operation
  • Low cost of ownership
Technical data
Sizes   DN 16 mm (⅝")
Body Material   Stainless Steel
Standard Flanges   ISO-KF
Leak Rate Vale Body, Valve Seat < 1 × 10-9 mbar ls-1
Pressure Range   1 × 10-8 mbar to 1.2 bar (abs)
Differential Pressure at Opening   1.2 to 1.5 bar
Temperature Ambient 0– 50°C
  Bakeout ≤ 150°C
Material Valve Body AISI 304L (AISI 1.4306)
Seal   FKM (Viton®)
Gasflow   0–6 l/min
Weight   0.046 kg / 1 lbs


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