11 Valves as parts of heating, steam generation, cooling, drying, ventilation, air conditioning, water supply, gas, electricity, hydrogen and energy installations; manifold blocks and manifolds as parts of heating, steam generation, cooling, drying, ventilation, air conditioning, and water supply, gas, electricity, hydrogen and energy installations; filters as parts of heating, steam generation, cooling, drying, ventilation, air conditioning, water supply, gas, electricity, hydrogen and energy installations; metal filters for industrial and domestic use; pressure relief apparatus for heating, steam generation, cooling, drying, ventilation, air conditioning, water supply, gas, electricity, hydrogen and energy installations; pressure relief devices for heating, steam generation, cooling, drying, ventilation, air conditioning, water supply, gas, electricity, hydrogen and energy installations; systems composed of the aforementioned goods for hydrogen distribution and hydrogen supply.