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Safety valve 740 Cast iron series with bellows Protection of all collective installations and in particular heating circuits Cast iron bracket body Green coloured identification plate Instant-opening model with "POP" effect "High temperature elastomer valve Manual flush lever Large expansion chamber and oversize drain orifices. Very high heat flux rates Max. service temperature 110°C Chilled water: temperature up to -10°C (max. 30% glycol) The given flow rates are for a setting overrun of 0.5b