Horizontal safety group assembly for hot water storage heaters

Observation on European Normative UNI EN 1487

It is specified that normative UNI EN 1487 define sizes, materials and requested performances (including test methods) of hydraulic safety groups for nominal dimensions from DN15 to DN40 and working pressure from 1 bar (0,10 MPa) to 7 bar (0,70 MPa). Hydraulic safety groups are to be connect to water heaters and tanks through the fitting of cold-water inlet source, with a temperature of distribution of 110° for all energy sources. Furthermore, they control and limit a pressure inside water heaters and forbid, having this function, reflux of the hot water into water system and contamination of the water inside heaters by drain water.

Hydraulic safety groups are not controlling temperature, but can control hydraulic safety of water heaters if mechanic resistance of heater remain at least equal to nominal pressure capacity.

So, it can be state that operators simply have to request and install safety groups in accordance with European Normative UNI EN 1487 by disposition of Ministry of Industry n°829571 from 26th March 2003.

P.S. “Ball-valve” type.

Technical characteristics

• Body: brass UNI EN 12165 CW617N chrome-plated
• Plugs and caps: PA6
• Diaphragm: EPDM 70SH
• Springs: steel UNI 3823
• Control knob: ABS
• Check valve: CLASS A
• Maximum working pressure: 10 bar (1 MPa)
• Maximum working temperature: 120 °C
• Safety relief valve pressure setting: 7 bar (0,7 MPa) ±0,1 bar (0,01 MPa)
• Maximum output of the water heater: size 3/4” 10 kW
• Discharge flow rate at 8,5 bar (+20% PS): with water: > 600 l/h. with steam: > 220 kg/h
• Usable with ART. 145 exhaust and adjustable siphon for safety group assembly