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Model Type 356 / 357 -High-Efficiency Safety Valves
356 / 357 type approval (D/G) (steam/gas), spring loaded for steam and gas and other heating systems according to EN 12828 / TRD. As safety valves for steam, gases and hot water in pressure vessels and steam boilers. Application also in accordance with DIN 4752.
Range of use:
- Grey cast iron: up to 300°C
- Spheroidal graphite iron: up to 350°C
- Cast steel: up to 400°C
- Stainless steel: up to 550°C
THIES High-efficiency Safety Valves meet the following German requirements: Pressure Vessel Safety Regulations, AD Specification A 2 for „Safety Valves", the Technical rules for steam boilers (TRD) and the Safety Valves Code.
Construction:
Spring loaded high-efficiency safety valve, angled.
- Series 356 gastight version.
- Series 357 version 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 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:
- up to DN 50 - R 1/4 ".
- over DN 65 - R 3/8 ".
