First, there is a leak in the safety valve. The industry said that when there is a small leakage in the safety valve, it is generally not easy to find, but even a small leakage point will expand in the erosion.
The test method is to test the pressure, in the sealed seal surface test, the water is included in the sealing surface, and the pressure is investigated to see if there is foam. The industry points out that "the safety valve procedural rules for soft seals need to be bubble-free, and hard seals may be available, but bubble generation rates must be within a certain range." This should be done after the calibration is complete, as the safety valve may break the sealing face during the calibration process. ”
Second, the tension spring produces fatigue. It is understood that the tension spring is greatly affected by temperature, environment (if the safety valve is closed, the influence of the medium should also be considered), etc., if this reason needs to consider the selection of the safety valve or quality problems. This also requires users to consider whether the selection of the safety valve is reasonable and whether the quality is passable when selecting the safety valve.
Third, pipeline factors. For example, oscillation and impact cause the setting pressure of the safety valve to be too large, and the valve core is separated from the sealing surface of the valve seat, resulting in damage and slag inclusion.
The industry said that in fact, the manufacturing requirements of the safety valve are quite high, because the sealing force of the safety valve is equal to the tension spring force - medium pressure, and the general place such as the main steam of the power plant, the feed water pressure and the working pressure of the safety valve, so the practice of sealing surface sealing force is not too large, low effect hope for good sealing, sealing surface to process accuracy to be very high, the data has high requirements.
Fourth, the function of the tension spring is unstable. The industry believes that the tension spring function of the safety valve must be very stable, due to the high temperature of the medium, it will lead to a decrease in the output of the tension spring, which will lead to a poor seal. In particular, the steam safety valve is equipped with a backflush plate, and general leakage may cause the safety valve to trip, and then affect the power supply.
In addition, the industry advocates not to protect themselves, the safety valve is an important component to ensure the safe operation of the equipment, as long as the qualified inspection unit can check and protect the safety valve. It is advisable to disassemble and assemble once a year and submit it for inspection.
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