Selection of safety valves
Thread Content
For the safety valves on steam boiler drums operating under a pressure of 2 megapascals, the A48-40 model (with a setting pressure of 2.08 megapascals) is commonly used. Can the A48-64 model be used instead? Why?
Of course not, because the safety valve on the steam boiler drum, which operates under a pressure of 2 MPa, has a lower set pressure of 2.08 MPa and a higher set pressure of 2.12 MPa. The spring operating pressure range corresponding to the selected safety valve should include two set pressures. The pressure levels for the operation of A48-40 springs in the range of 2.0~2.5 MPa meet the requirements. The lowest level of spring operating pressure for A48-64 is 3.0~4.0 MPa.