Isn’t there a term for “recovery pressure” in the standards for safety valve instruments?
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Gentlemen, the Instrument List I have does not include the \"recovery pressure\" for safety valves, and I was wondering – is this value generally not provided? So how should the downward pressure be determined? (Obtain a pressure lower than that of normal equipment operation? ）
It must be there; otherwise how can it be controlled?
Safety valves have a setting pressure, a discharge pressure, a return pressure, and a design pressure; standards specify the return pressure clearly.
The seating pressure for domestic products is around 85% of the opening pressure, while imported products can achieve a precision of 90% of the opening pressure. As for the American brand CIRCLE SEAL, the precision of its products exceeds 95%!
I’ve seen school safety valves; it seems that the setting and testing of the opening pressure and closing pressure are done through calculations. For example, the opening pressure is set to 1.1 or 1.2 times the maximum operating pressure. I’ve forgotten exactly what the ratio for the closing pressure is