I would like to ask for advice
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What is the purpose of the sentinel valve on the turbine casing?
Your question reminds me of the saying \"one leaf obscures the view\":D Two images should be shown – a panoramic view of the device and a close-up. Or draw a simple diagram to facilitate discussion. Turbo cylinder bodies vary; if a \"whistle\" (pin) is involved, it should be a positioning pin. For reference.
You say this device should be a pressure relief valve, or rather a safety valve; however, it’s not used much these days, and a flange cover has been used in its place.
There should be safety valves or something similar to prevent overpressure in the control stage or steam chamber
Isn’t this Xiao Luan? For turbine overpressure relief