Hot water safety valve SV 422

stainless steelEPDMflange

 For installation upstream of gas heat exchangers as pressure safeguard for the entire heat circuit  Situated at the inlet and outlet nozzles of the heating medium at the gas pressure-resistant heat exchanger  Internal medium actuated with reliable triggering in case of pressure increase in the water system Benefits  The SV422 reliably blocks only the damaged heat exchanger from the system in the event of leakage  If there is only a minimal loss of water, the one reserve heat exchanger continues to function reliably  There is no freezing of the reserve controlled system  The compact design enables short, simple situation in the water circuit at the heat exchanger  The newly adapted structure allows for a simple and uncomplicated functional test  Diameter up to DN200, pressure levels up to class 1500, operating temperature up to 120°C Functional description The WW-SSV SV422 is installed at the heating medium inlet and outlet flange of the gas pressure-resistant heat exchanger in intermediate flange design. If the pressure in the water system increases (e.g. due to a leakage at a heat exchanger pipe), the SV422 blocks the flow to and from the heat generator. This safely limits the pressure in the water system. The SV422 remains closed while there is pressure in the heat exchanger that is higher than the trigger value of the SSV setting. Any slight increase in pressure in the water system is relieved by the pressure safety valve on the boiler. The structure of the valve is shown below. Under normal operating conditions, the same pressure prevails in all valve chambers. Due to the spring force, the pipe slide is in the open position.