Pressure reducing valve for steam

I'm having trouble adjusting the pressure and the safety valve blows out. Is this a problem with the pressure reducing valve? Also, is it possible to exchange parts? (There is a video in the answer details)

The cause of the increase in pressure on the secondary side may be foreign matter entanglement, poor sliding, etc., and disassembly and maintenance is required.
Basically, it can be dealt with by replacing parts, but damage to parts that cannot be replaced locally, such as valve seats, will be replaced by the product.

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RD44N－F □

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