Control valves are often expensive units in the regulating loop, and as part of the process flow, failure can cause the process unit to shut down. Therefore, it is necessary to specify a detailed control valve sequence program.


Control valve maintenance is divided into two categories, one is preventive maintenance, including preventive measures taken during installation, online inspection of valve performance and treatment of environmental damage during use. The second category is the maintenance when the control valve cannot meet the operating requirements. The latter generally refers to repairs in the workshop, and in some industries, it is completed on the pipeline under the specified shutdown conditions.


We provide detailed installation and maintenance instructions for each type of control valve we manufacture.


Preventive maintenance refers to planned overhauls before failure occurs. This plan is usually developed based on experience with previous valve performance under known operating conditions. At the same time, minimize unplanned downtime to maximize safe operating time. Control valve repairs that are not part of a preventive repair program are called workshop overhauls.



At the beginning of the installation, a preventive maintenance plan for the control valve should be drawn up. Although the connection of the valve body and the control valve is a solid structure, they cannot be used to adjust the misaligned pipeline. Care must be taken that any stress caused by inappropriate piping arrangements should be ensured to be relieved elsewhere in the piping system. Line stress acting on the control valve can cause the valve stem guide and seat system to become misaligned and, in the case of split body valves, cause the valve body flange to disengage. This can cause deterioration, seat or flange leakage, packing leakage.