Control valve installed before the inspection should be part of the performance of the control valve before installation. From the factory to the front of the installation, environment by transportation, storage, etc, control valves and accessories of different environmental conditions that control valves and accessories change performance, therefore, the need for inspection before installation. Instrument equipment in the process of transportation random vibration excitation by the means of transport and handling of all kinds of shocks, in addition, in the process of transportation, the environment temperature, humidity, such as climate change, as a result, the performance of the instrument in the process of transportation equipment. Instrument equipment in the process of storage for storing environment change of climate, biological and chemical environment parameters, that cause the change of the instrument performance. Control valve before installation should pay attention to the operation instrument equipment during the installation process caused by handling or assembly of mechanical stress effect, also make the performance of the instrument equipment change, but as a result of the installation process is generally short, therefore, has little effect on installation environment. Control valve before the installation of environmental conditions and other similar instrument of environmental conditions, control valve before installation inspection site environmental conditions are as follows. Temperature: 10 ~ 35 ℃. Humidity, air relative humidity is not more than 85%. Have no corrosive gas. Have good lighting, clean, quiet, and the light is enough. Should not be in vibration, noise, moisture, dust and more places that have strong magnetic field interference test. f。 Shall have the power, air and hydraulic pump test equipment and water supply and drainage equipment. g。 Power supply requirements: 50 hz, 220 vac or 48 vdcil0 %, 24 vdci5 %. 7 mpa, stable pressure, plus or minus 10% shall not exceed the rating of the fluctuation. Control Industrial Valves before installation should pay attention to the operation of the control Industrial Valves before the installation of inspection content control valve before installation includes the following content: a. Static characteristics of control Industrial Valves test; B, air tightness test; Sealing test, if necessary, should replace the stuffing box; Leakage testing; Light travel time all tests; f。 Insulation performance testing; G, compression strength test. Before the actual installation, testing must have the appearance test, compression strength test starting point and end point error, dead zone, return difference, the basic error test, leakage test, no-load tests of total travel time, etc.
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