Membrane Safety Valve for Closed Water Heaters According to DIN 4753, 6 Bar, up to 75 kW, E 1/2 Inch - A 3/4 Inch

• Watts membrane safety valve for closed hot water heaters (blow-off pressure: 6 bar)
• Connections: input: 1/2 inch internal thread x output: 3/4 inch internal thread. Max. Performance up to approx. 50 KW
• Material: pressed brass CW617N according to EN 12165-99; membrane made of heat-resistant and ageing resistant material; rotating cap made of impact-resistant plastic; spring made of NiCr steel.
• The blow-off pressure is preset by the factory and secured against adjustment by a pressed safety disc bearing the blow-off pressure and the component test mark. The function of the safety valve must be checked once a year by a professional: by venting the rotating cap a manual release is effected to clean the valve seat.
• Installation requirements: the membrane safety valve must be installed at a point with minimum temperature, at the highest point or in the flow in the immediate vicinity of the heat generator, taking into account the direction of the arrow. The safety valve connection line shall be designed in such a way as to prevent build-up of dirt or residue, shall not exceed 1 m long, shall not have constrictions of the cross-section and shall not be allowed to install shut-off devices.

The blow-off pressure is pre-set in the factory, and is secured against adjustment by a fitted safety washer, which supports the blow-off pressure and the component test mark. Installation requirements: The Membrane Safety Valve must be fitted to a point with minimum temperature, at the highest point, or in flow of in the immediate vicinity of the heat generator in respect of the direction. The connecting cable for the safety valve must be designed so that no accumulation of dirt and residue is possible, shall not exceed 1 m length, should have no constriction in the cross section, and it is not permitted to install isolating equipment. The functioning of the safety valve must be tested by an expert once a year: by venting the rotating cap, a manual drain ensures that the valve seat is clean.