THIES Diaphragm type High-efficiency Safety Valves

390 / 391 type approval (D) (steam), weight loaded according to EN 12828 - 0,5 bar / TRD 721

392 type approval (D) (steam), weight loaded according to EN 12828 - 1 bar / TRD 721

390 / 391

Application:
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 ".

392

Application:
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.
Alternatively: 0,55 - 1 bar.

 

Constructions:
Weight loaded, diaphragm type, high-efficiency safety valve, angled, with highly elastic seal and metal backing in valve head.

 

Series 392 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.

 

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 of size R 1/4 " up to
nom. diam. 50 mm.