Installation and maintenance Of the Safety valve

The correct operation of the safety valve is very important, so what are the aspects that need to be paid attention to when installing, using and maintaining the safety valve?

List of content for this article：

1. The correct operating of the safety valve,

2. The measures for safety valve's installing,

3. The accurate working conditions for safety valve.

The quality of the safety valve itself is a prerequisite for safe and stable operation, but if the user does not operate properly, it is possible that the safety valve will not work properly, so installation and use are very important. Among the problems reported by users, safety valve failures due to improper installation and use accounted for 80%. This requires users to improve their knowledge of the safety valve products and technology, in strict accordance with the operating specifications.

The safety valve is a precision mechanical instrument, and its installation and use requirements are relatively high. For the continuous process industry, after the completion of a set of equipment, it will undergo several processes such as purging, air tightness, and pressure test, and then commissioning. One of the common mistakes made by users is that the safety valve is installed on the process pipe during the purge. Since the safety valve is in the closed state, the debris enters the safety valve inlet during the purge process, and the safety valve takes off when the pressure test is performed. The safety valve will fail due to debris.

In accordance with national standards, the following measures must be taken when purging:

1. The safety valve is allowed to be installed on the process pipe, but the inlet of the safety valve should be blinded and sealed.

2. If the safety valve is not installed, seal the connection between the safety valve and the process pipe with a blind plate, and return the safety valve after the pressure test is completed.

3. The safety valve is locked, but there is a risk in this measure, which may be forgotten due to the negligence of the operator, resulting in the safety valve not working properly.

In the process of use, the process operation must be stable. If the pressure fluctuations cause the safety valve to take off, according to the national standard, once the safety valve starts to jump, it must be re-calibrated.

In addition, the technical parameters provided by the user must be accurate, and the application medium must be fixed. For example, the medium provided is air, but if chlorine gas is mixed during use, chlorine gas and water vapor combine to form hydro chloric acid, which will be a safety valve. Corrosion or the technical parameters provided in the medium is water, but the actual medium contains sand, which will cause wear on the safety valve. Therefore, the user cannot change the process parameters at will. If it needs to be changed, it is necessary to check whether the safety valve provided by the valve manufacturer is suitable for changing the working conditions and communicate with the manufacturer in time.

If all of the above can be operated correctly according to the standard specifications, then the safety valve must be tested every year, and the operator should obtain the “Special Equipment Operator Certificate”.