What is an appropriate pressure rating for steam valves?
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For a pressure of 6 kg and saturated water vapor at 165°C, is it acceptable to use a valve with a pressure rating of PN1.0 MPa? Is it too low?
Check the pressure-temperature ratings to find out the maximum allowable operating pressure for the material being used at the operating temperature.
It should be possible, but attention must be paid to the material properties; the pressure and temperature must be suitable for those properties.
Take a look at the temperature-pressure curves for the materials specified in ASME b16.34
A 1.0 MPa valve is suitable for systems using normal-temperature water as the medium, while a 2.5 MPa valve is more appropriate for steam systems