Installation of regulating valve

The installation and commissioning of the regulating valve is the most complex, the most difficult and the most prone to problems. In the whole process, the instrument major and the pipeline major should coordinate, support and cooperate closely with each other.

Problems should be reported and solved in time, and the operation should be carried out in strict accordance with the requirements and regulations. Only in this way can the installation quality and commissioning quality of the regulating valve be guaranteed. In order to ensure the smooth progress of the entire installation project and the smooth commissioning of the entire industrial plant. At present, with the rapid development of control valve technology, there are many production forms of control valves with different functions.

The following focuses on the common problems that should be paid attention to before installation and operation of various types of control valves.

Valve body, valve trim specifications. This content mainly includes: valve model, type, nominal size, valve seat size, valve core form, flow characteristics, leakage grade, valve body material, valve core material, valve seat material, Kv (Cv) value, flange standard grade Size and sealing surface form, etc., as long as one of the contents is found to be inconsistent with the design, it should be determined and approved by the designer.

 

b. Actuator part. This content should mainly check the actuator model, type, action form, spring range, air supply pressure, etc.

c. Locator section. This content mainly checks the input signal, air source pressure, electrical and air source interface size and explosion-proof grade of the positioner, of which the explosion-proof grade shall not be lower than the design grade requirements.

d. Attachments. Carefully clean up various accessories according to the design and technical requirements of the regulating valve, such as filter pressure reducing valve, valve position switch, solenoid valve, handwheel mechanism, and special tools.

The inspection of the above content can be achieved by cleaning, measuring instruments, viewing nameplates and special detection methods (such as flange and bolt materials can be identified by spectral analysis) and other methods.

Complete solutions for Industrial valves