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Thies - Model 390 / 391 -High-Efficiency Safety Valves
These safety valves are for blowing-off saturated steam from pressure generators. THIES-Diaphragm High-efficiency Safety Valves meet the following German requirements: the AD Specification A 2 for „Safety Valves“, the Technical rules for steam boilers (TRD), the Safety Valve Code according to EN 12828. Response overpressure: 0,5 bar. Alternatively: 0,1 - 0,5 bar.
Constructions: Weight loaded, diaphragm type, high-efficiency safety valve, angled, with highly elastic seal and metal backing in valve head.
Series 390/391 with closed bonnet.
Liftable valve head. Force is transmitted centrally at the valve head via ball. Corrosion-resistant spindle guides ensure reliable and precise response of valve.
Flange connections:
Grey cast iron version: inlet and outlet as per DIN 2533 PN 16
Spheroidal graphite iron version, cast steel version and stainless steel version:
- inlet as per DIN 2545 PN 40
- outlet as per DIN 2543 PN 16
The safety valves are provided with a drain plug:
- up to DN 50 - R 1/4 ".
- over DN 65 - R 3/8 ".