The air compressor safety valve is a key safety guarantee for pressure pipelines and pressure vessels, and it is also one of the air compressor accessories. To ensure the normal operation of the safety valve and extend its service life, during use, regular inspections should be carried out to check for abnormal phenomena such as leakage, jamming, and spring rust of the safety valve in operation. Additionally, attention should be paid to observing whether the lock nuts of the adjusting screw sleeve, adjusting ring, and set screws are loose. If any problems are found, appropriate maintenance measures should be taken in a timely manner.

 The air compressor safety valve belongs to the category of automatic valves. Its working principle is: when the pressure of the medium in the air compressor or pipeline rises above the specified value, it will discharge the medium to the outside of the system to prevent the medium pressure in the pipeline or equipment from exceeding the specified value. By controlling the pressure not to exceed the specified value, it can play an important protective role in the operation of the air compressor and personal safety. According to the *Safety Technical Supervision Regulations for Safety Valves*, the regular calibration of safety valves should be carried out at least once a year, and the relevant safety technical specifications shall have corresponding provisions.

 How to Test Air Compressor Safety Valves?

1. Off-line calibration on a calibration bench: Install the safety valve on the calibration bench, then use a calibration medium to open the safety valve, and confirm the opening pressure by observing the pressure gauge. However, this method cannot take into account the calibration of backpressure safety valves or safety valves for high-temperature or low-temperature media.

2. On-line instrument calibration: Measure the downward spring force acting on the safety valve through external force, and use this to calculate the opening pressure of the safety valve. This method generally does not affect production, does not require changing the system pressure, and is relatively fast and convenient in detection. However, it cannot test the sealing performance of the safety valve.

3. Pressure-rising popping calibration: Install the safety valve in the system, artificially increase the system pressure until the safety valve pops open, and observe the opening pressure of the safety valve. This calibration method causes greater damage to the sealing surface of the safety valve and is relatively more dangerous to operate.

   Precautions for Using Air Compressor Safety Valves

1. When the pressure increases rapidly and the discharge speed of the safety valve is lower than the pressure increase speed.

2. When there are strict requirements for sealing.

3. When the materials in the container may cause the safety valve to fail (e.g., if the materials in the container contain many solid particles, the safety valve may have poor sealing after reseating).

4. When the materials in the container are highly toxic or have other properties that endanger public safety.