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2: The safety valve check is generally performed in the cold (also at room temperature), and the safety valve installed on the device may be lower because the medium temperature is too high and the opening pressure is lower than that set in the cold state (however, Usually there will not be such a large error value)
3: Look at the pressure gauge is not accurate, because it is possible that the safety valve is normal but the pressure gauge is not accurate.
4: Pressure fluctuations are too great.
Safety valve common trip failure:
1, leakage of safety valve.
2, safety valve delayed return seat time is too long.
3, frequency jump of safety valve.
4. The pressure of the safety valve is low or it does not return to the seat.
The most common should be failure of the safety valve due to poor sealing surface or damage to the sealing surface. The method to eliminate this kind of failure is to remove dirt and impurities that have fallen onto the sealing surface or to repair the sealing surface. When the valve setting pressure is too close to the normal working pressure of the equipment, the valve is also prone to leakage when it is subjected to vibration or the steam pressure fluctuates. The adjustment pressure should be properly adjusted according to the system conditions. Sometimes there is also a slackening of the spring to lower the set pressure and cause the valve to leak. It may be due to high temperature or corrosion. Replace springs and even replace valves and other measures according to the reasons.
There are several reasons why the setting pressure of the safety valve starts to jump in advance. 1: When setting the opening pressure, it is wrong (this is unlikely, but it does not mean it is not).