THIES Diaphragm type High-efficiency Safety Valves
393 type approval (D) (steam), spring loaded according to EN 12828 - 1 bar / TRD 721
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 721), the Safety Valves Code according to EN 12828.
Response overpressure: 1 bar.
Spring loaded, diaphragm type, high-efficiency safety valve, angled, with highly elastic seal and metal backing in valve head.
Series 393 with closed bonnet.
Valve head is liftable. Force is transmitted centrally at valve head via a ball. Corrosion-resistant spindle guides ensure reliable and precise response of the valve.
Grey cast iron version: inlet and outlet as per DIN 2533 PN 16
Spheroidal graphite iron version and cast 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 ".
Models 393 Order Code No.
Series 393 of grey cast iron PN 16 393 GN
Series 393 of spheroidal graphite iron PN 40 393 GGG
Series 393 of cast steel PN 40 393 SNC