1. Should first stop cleaning and stop the safety valve, appearance inspection, and then stop the collapse of the safety valve, check the parts. It is found that the body, spring, stem and sealing surface of the valve are damaged; cracks; corrosion, deformation and other defects of the safety valve should stop repairing, adjusting and replacing. Safety valves with cracks in the body, sticking of the spool to the seat, serious corrosion and deformation of the spring, serious damage to the parts and unable to repair should be scrapped.

平安阀在线校验时，先将阀体恰当清洗、除锈，用肉眼检查平安阀阀体受压局部有无锈蚀和裂纹，假如有裂纹该阀应该立刻改换。

In the on-line check of safety valve, the valve body should be properly cleaned and rusted first, and the corrosion and cracks in the pressurized part of safety valve body should be inspected with naked eyes. If there are cracks, the valve should be replaced immediately.

无制造答应证的制造厂消费的平安阀或无铭牌或无校验记载的平安阀应该予以判废。

Safety valves consumed by manufacturers without manufacturing permits or without nameplates or verification records should be discarded.

2．整定压力校验

2. Setting Pressure Calibration

迟缓升高平安阀的进口压力，当到达整定压力的90％时，升压速度应当不高于O．OllVlPa／s。当测到阀瓣有开启或见到、听到实验介质的连续排出时，则平安阀的进口压

Slowly raise the inlet pressure of safety valve, when 90% of the setting pressure is reached, the boost speed should not be higher than O.Oll VlPa/s. When the valve disc is opened or continuously discharged from the experimental medium is seen or heard, the inlet pressure of the safety valve is measured.

力被视为此平安阀的整定压力。当整定压力小于0．5MPa时，实践整定值与请求整定值的允许误差为±0~014MPa；当整定压力大于或等于0．5MPa时为±3％整定压力。

Force is regarded as the setting pressure of the safety valve. When the setting pressure is less than 0.5 MPa, the allowable error between the practical setting value and the requested setting value is (+0~014 MPa); when the setting pressure is greater than or equal to 0.5 MPa, it is (+3%).

3．密封性能实验

3. Sealing performance test

整定压力调整合格后，应该降低并且调整平安阀进口压力停止密封性能实验。当整定压力小于0．3MPa时，密封性能实验压力应当比整定压力低0．03MPa；当整定压力大于或等于0．3MPa时，密封性能实验压力为90％整定压力。

After qualified adjustment of setting pressure, the inlet pressure of safety valve should be lowered and adjusted to stop sealing performance test. When the setting pressure is less than 0.3 MPa, the experimental pressure of sealing performance should be 0.03 MPa lower than the setting pressure; when the setting pressure is greater than or equal to 0.3 MPa, the experimental pressure of sealing performance is 90% of the setting pressure.

当密封性能实验以气体为实验介质时，关于封锁式平安阀，可用走漏气泡数表示走漏率。其实验安装和实验办法可按C。B／T12242《平安阀性能实验办法》的请求，合格规范见GB／T12243《弹簧直接载荷式平安阀》或其他有关规程、规范的规则；关于非封锁式平安阀，可依据封锁式平安阀走漏气泡和压力表压力降落值的关系，以相对应的压力降落值来判别。

When gas is used as the experimental medium in the sealing performance test, the number of leaking bubbles can be used to express the leaking rate for the sealing safety valve. The experimental installation and method can be according to C. For the request of B/T12242 "Safety Valve Performance Test Method", the eligible specifications can be found in GB/T12243 "Spring Direct Load Safety Valve" or other relevant regulations and rules. For non-blocking safety valves, the corresponding pressure drop can be judged according to the relationship between the leakage bubble of the blocking safety valve and the pressure drop value of the pressure gauge.

不能应用气泡和压力降落值停止判别时，可用视、听停止判别。在一定时间内未听到气体走漏声或阀瓣与阀座密封面未见液珠即可以为密封实验合格。

When bubbles and pressure drop values can not be used to stop discrimination, visual and auditory stop discrimination can be used. In a certain period of time, no sound of gas leakage or no liquid beads on the sealing surface of disc and seat can qualify the sealing test.

4．平安阀的校验应该连续停止整定压力校验和密封性能实验，普通不少于2次。关于盛装易燃、易爆或毒性水平为中度以上的介质等不允许有微量走漏的设备，其平安阀密封性能实验不可少于/3次并且每次都应当契合请求。

4. The check of safety valve should stop setting pressure check and sealing performance test continuously, usually no less than 2 times. With regard to equipment containing medium with inflammable, explosive or toxic level above moderate, which does not allow trace leakage, its safety valve sealing performance test shall not be less than/3 times and shall meet the requirements each time.