360 / 361 type approval (F) (liquids), spring loaded for liquids and district heating systems


Safety valves for blowing-off liquid from fixed pressure vessels, subject to the condition that no evaporation occurs. Also suited to district heating systems. If the liquid to be blown off does not have similar properties to the liquid (water) used in the valve testing procedure, then the properties of the liquid, in respect to chemical aggressiveness or sticking tendency, must be taken into account in the acceptance testing of the pressure vessel.


THIES High-efficiency Safety Valves meet the requirements of the German Pressure Vessel Safety Regulations and AD Specification A 2 „Safety Valves“.


Spring loaded high-efficiency valves, angled, with
O-ring seal in the valve head.



Series 360
with closed protective bonnet and closed lift housing.
Series 361
with closed protective bonnet and open lift housing.

Valve head is liftable. Force is transmitted centrally at the valve head. Corrosion-resistant spindle guides ensure reliable and precise response of the valve.


Flange connections:
Spheroidal graphite iron version:

  • inlet as per DIN 2533 PN 16 = DIN 2545 PN 40
  • outlet as per DIN 2543 PN 16


The safety valves are provided with a drain plug:
size R 1/4 ".



Models 360 / 361                                                                        Order Code No.
Series 360 of spheroidal graphite iron   PN 40 = PN 16             360 GGG
Series 361 of spheroidal graphite iron   PN 40 = PN 16             361 GGG