Pressure reducing valve for steam

If there are two types of materials such as pistons, CAC and SUS, please tell me the difference.

CAC is a bronze casting that is often used for valve bodies and key components. SUS (stainless steel) has better corrosion resistance than CAC, but the price is high.
In addition, since both are the same in terms of troubles such as dust and scale, please select after considering the material of other valves on the piping.

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RD44N－F □

Contains characters that indicate pressure classification and options.

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