This article analyzes how the solenoid valves of trailer-mounted refrigeration units receive signals from the industrial automation control system to drive differential pressure regulating valves. These valves change the cross-sectional area between the valve core and seat to control process parameters such as flow rate, temperature, and pressure of the pipeline medium, achieving automated regulation.

The electric actuator of the electric sleeve regulating valve is an integrated electronic structure with a servo amplifier. To ensure the regulating valve functions properly during startup and the system operates safely, the nameplate markings on the new valve should be checked to ensure they match the design requirements before installation.

If the regulating valves in the original system have undergone major repairs, in addition to verifying the above items, the sealing of the old valve's packing gland and connections should also be checked.

In field use, many problems with regulating valves are not due to the quality of the valve itself, but rather to improper installation and use of the trailer-mounted unit's solenoid valves. These problems may include improper installation environment, incorrect installation location and orientation, or unclean pipelines.