The pressure reducing valve vibrates and makes a loud noise. Why?
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The front section of the pressure reducing valve is a liquid storage tank. The upper part of the liquid storage tank is hydrogen and the bottom is liquid ammonia. The liquid ammonia passes through the pressure reducing valve from the bottom to a pressure of 25MPa. During decompression, the inlet and outlet pressure gauges swing and make a loud discontinuous sound. The greater the flow rate, the faster the sound frequency.
It is best to confirm whether the problem occurred during the original test run or whether it was an acquired problem. If it appears the day after tomorrow, it should be a valve problem. If it is congenital, it may be a design problem.
P1, pressure 25MPa, what is P2? The pressure difference is too large, the liquid ammonia vaporizes, or at least flashes, and the noise and vibration are natural.
1 When the fluid passes through the throttling component, the flow rate needs to be controlled within an appropriate range. 2 When the pressure drop before and after the throttling element is too large, the flow rate increases, and some fluids will flash, accompanied by noise and vibration. 3 Excessive flow rate is the cause, and noise and vibration are the symptoms.
Excessive pressure drop leads to excessive flow rate and instantaneous vaporization and flash evaporation!