3 Bar diaphragm safety valve with rear attack, 1/2" MF threadThe diaphragm safety valves are used for pressure control on heat generators in heating systems and more generally on all powered systems with water or with mixtures of water and carrier liquids (e.g. glycol). When the calibration pressure is reached, the valve opens preventing, by discharge into the atmosphere, the circuit from reaching pressure spikes that could damage generator or circuit components. The pressure of the exhaust valve is calibrated by the manufacturer, and no variation from the set calibration is possible if it is not altered the valve itself. Disc opening height: micro safety valve -openingStructural shape: spring typeType (channel position): two-wayFlow direction: one-wayDriving mode: manual Note: The data is all measured manually, please allow 1-3cm error, due to the difference of light and display, there will be a certain color difference, the actual object received shall prevail. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.