Part of the performance test should be carried out before the installation of the control valve. Control valves and accessories from the factory to the pre-installation, transportation, and storage environment, different environmental conditions control valves and accessories performance change, therefore, the need for pre-installation inspection.
Instrumentation random vibration excited by means of transport and handling during transport by various shocks, during transport, ambient temperature, humidity, etc. · climatic conditions will change, therefore, in the transport process instrumentation The change in properties.
The instrumentation during storage due to changes in the storage environment, climate, biological and chemical environmental parameters, which led to changes in instrument performance.steam solenoid valves
Instrumentation during the installation process by the mechanical stress caused by handling or assembly, but also to the changes in the instrument performance of the device, but the installation process is generally relatively short, so the impact of the installation environment is smaller.pneumatic hand valve
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