The pressure relief valves protect hot water storage heaters from internal overpressure. Furthermore, they restrict or prevent (according to requirements) water returning to main supply piping. Pressure relief valves essentially consist of 8 main devices: 3 controlling flow and 5 safety devices. The combination of these devices permits realisation which will satisfy customer’s requirements.
1. Water flow control device
Con questo particolare si controlla e gestisce il transito di acqua dalla rete di alimentazione allo scaldacqua qualora al suo interno si verifichi una pressione inferiore di 0,1± 0,2 bar (0,01 ± 0,02 MPa), and in the same time it runs or prevent water to go back into inlet source when the pressure inside water heater become higher for 0,8± 1,5 bar (0,08 ± 0,15 MPa).
2. Discharge pressure device ( Safety )
The function of discharge pressure device is to avoid excessive pressure increment inside water heater. Calibration setting of discharge device is reached by compression of a spring to the standard value of opening 8,5 bar with tolerance ± 1 (0,85 MPa ±0,1). This value can vary and be set according to the client’s request. The part is sealed with a disk to prevent tampering, and if the seal is tampered with and adjustment is made, it is not possible to open at pressures higher than 12 bar (1.2 MPa). During the testing the value of calibration setting is took on the second opening of discharge pressure device. During the discharge phase the device becomes watertight again when the pressure has decreased by 1 bar (0.1 MPa) with respect to the opening value 8.5 bar ±1 (0,85 MPa±0,1). All valves are calibrated and tested automatically before being packed and we guaranty high quality standards constant in quantities and time.
The body is made of hot moulded BRASS UNI EN 12165CW617N. Direction of the water flow. The surface is nickel – plated. Available (according to type) with threaded connections: 1/2 ” -3/4 ” -1 ” Gas. The valve body is also designed to withstand internal pressures up to 16 bar (1.6 MPa). Maximum operating temperature of fully assembled valves: 120° C. The valve is automatically calibrated and checked during assembling. Further testing in percentage is carried out once assembling is finished.