The safety valve is a special branch of the valve family. Its speciality is because it is different from other valves only as a switch, and more importantly, it is used to protect the safety of the equipment. In view of the need for equipment pressure relief, safety valves play a vital role in protecting equipment.
The opening and closing member of the safety valve is normally closed under the action of external force. When the pressure of the medium in the equipment or pipeline rises above the specified value, the medium is discharged to the outside of the system to prevent the pressure of the medium in the pipeline or equipment from rising above the specified value. A special valve that prevents the pressure of the medium in the pipe or equipment from exceeding the specified value by discharging the medium outside the system. The safety valve is an automatic valve. It is mainly used on boilers, pressure vessels and pipelines. The control pressure does not exceed the specified value, and it plays an important role in personal safety and equipment operation. According to the "Safety Valve Safety Supervision Regulations", the periodic verification of safety valves is generally at least once a year, and safety technical specifications should have corresponding regulations.
What are the methods for testing air compressor safety valves?
1. Calibration station offline verification: It is necessary to install the safety valve on the calibration table, and then use the calibration medium to open the safety valve. Observe the pressure by checking the pressure gauge. However, this method cannot take into account the safety valve check of the back pressure relief valve and the high temperature or low temperature medium.
2. On-line instrument calibration: It is the external force that measures the spring force acting on the safety valve. It can be used to calculate the opening pressure of the safety valve. This method generally does not affect the production and system pressure. Change, the speed of detection is relatively fast and convenient, but the method can not detect the sealing performance of the safety valve.
3. Boost jump method: the safety valve is installed in the system, the system is artificially boosted, until the safety valve takes off, to observe the opening pressure of the safety valve. This verification method will damage the sealing surface of the safety valve. Larger, the risk of operation is relatively large.
Whether a thing is useful or not, sometimes it depends on where it is. If it is not used well, it will be a big security risk. The air compressor safety valve is such a product. Under what circumstances can the air compressor safety valve not be used?
1. The pressure will increase rapidly, and the discharge speed of the safety valve will be less than the growth rate of the pressure.
2. When there are strict requirements for sealing.
3, the material inside the container will lead to the failure of the safety valve, such as the material in the container contains a lot of solid particles, the safety valve will lead to a tight seal after returning to the seat.
4. When the materials in the container are highly toxic or otherwise obstructing the nature of public safety.
The above situation is not suitable for the use of safety valves alone, and it is necessary to use a rupture disc or a safety valve in combination with a rupture disc.
