Feb 11, 2026
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21.2 Pressure Relief Valve
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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
Features：
- Vacuum system protection > 1.5 bar
- Trigger calibrated to open valve at 1.2 to 1.5 bar
Benefits：
- 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 |
