Series 355bHL

Our proven technology combines versatility with material innovation to meet a wide range of requirements: The safety valve made of high-quality ductile iron GGG-40.3 is a cost-effective solution and offers an excellent alternative to corrosion-resistant variants made of gunmetal or stainless steel. Equipped with an elastomer bellows and a metal-supported elastomer seal, our D/G/H safety valves are specially designed and approved for use in large heating systems within industrial and building services engineering as well as in combined heat and power plants and district heating supplies.

These valves meet the strict requirements of the Swiss SWKI and offer an optimal solution for applications that require robust, durable and efficient safety technologies. Thanks to the special design with elastomer technology, our safety valves offer reliable performance under the demanding conditions of heating systems and help to maximize the safety and efficiency of installations.

• Flange connection

• biogas plants
• Combined heat and power plants
• District heating transfer stations/ house stations

For safeguarding closed, thermostatically protected water heating systems with flow temperatures up to 120°C for all static heights or nominal outputs above 350 kW according to TRD 721, DIN 4751 and DIN EN 12828.

In the event of failure of the thermostatic control and limiting devices, the safety valve must blow off the entire heating output of the boiler in the form of hot water and steam. 

Safety valves are permanently set and sealed at the factory.