What is the relationship between the nominal pressure of a flanged safety valve and the nominal pressure of the flange at the valve’s interface?
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What is the relationship between the nominal pressure of the safety valve and the pressure rating of its flange? The valve body of the safety valve is marked with DN50 and 16. Does this mean that the nominal diameter of the inlet flange of the safety valve is DN50, and the flange pressure rating is PN16? Or does the safety valve itself have a nominal diameter of DN50 and a nominal pressure of PN16, independent of the flange it is connected to? The code for this safety valve is A42Y-16C. What are the diameter of the inlet and outlet flanges, as well as the pressure rating of this safety valve?
It must be related to the flange connected. What is marked on the valve body corresponds to the corresponding connection flange.
When purchasing a safety valve, in addition to knowing the code A42Y-16, what else is needed, such as the nominal diameter, the pressure ratings of the inlet and outlet flanges, and the nominal diameter?
But his valve body has only one pressure rating – so which one, the inlet flange or the outlet flange, corresponds to that pressure rating? Don’t safety valves often have their pressure ratings changed? The pressure level behind the valve is usually one grade lower than that in front of the valve
It is necessary to know the nominal dimensions for import and export, the pressure rating, and most importantly, the starting pressure, also known as the set pressure
For flange-connected safety valves, whether at the inlet or outlet, they must be used in conjunction with the flanges provided on the valve for connection.
A safety valve marked PN16 on the valve body means that the valve’s own pressure rating is PN16. Safety valves with PN16 rating can have inlet and outlet flanges of type DN50X80-PN25X16, or they can also have flanges of type DN50X80-PN16XPN16; the pressure rating of the inlet and outlet flanges is determined when I purchase the safety valve, right?
Yes! Generally, the inlet diameter is small while the outlet diameter is large. High pressure is released to low pressure, involving a process of expansion; therefore, the outlet is generally larger than the inlet