What is the electric control valve? Its performance and what? And how to test it? OLS below the valve to recount.
Electric control valve is connected by the electric actuator and control valve combination mechanical connection assembly, commissioning install constitute electric control valve. It is important execution unit in the industrial automation and process control instrumentation. Electric control valve performance indicators are: basic error, hysteresis, deadband, rated travel deviation, leakage, sealing, compressive strength, appearance, rated flow coefficient inherent flow characteristics and resistance to vibration, temperature, long-term reliability , explosion-proof, damping characteristics, supply voltage change, the impact of changes in ambient temperature, insulation resistance, dielectric strength. Requirements and test methods of the 10 indicators and pneumatic valve or similar, which is the basic error, hysteresis, dead zone, the amount of leakage, sealing, appearance, the damping characteristics of the impact of changes in the supply voltage, insulation resistance for factory test project, after three performance requirements and test methods as follows: 1) the damping characteristics of the damping characteristics of the electric control valve, the stem does not exceed 3 times the half cycle "swing required on the positive and negative stroke of the two directions. The test method is added at the input, respectively the value of the input signal range of 20%, 50%, 80% of the signal observed oscillating number of the stem in the positive and negative stroke of the corresponding position on the "half-cycle". 2) Power supply voltage changes affecting the supply voltage of the electric control valve 220 +20-30 V range changes, the the stem displacement value should not exceed 1.5% of the whole trip. The test method is the stroke value of the the power supply voltage of 220V, was added at the input signal range of values 20% of the signal measurements corresponding to the stem, and then the power supply voltage was adjusted to 190V and 240V, the measurement corresponding Stroke change value . Then followed by adding 50% of the range of values of the signal of 80% of the signal, measuring the changes in the value of the stem travel. 3) Insulation resistance when the ambient temperature is 10 ~ 35 ℃, relative humidity does not exceed 85%, the insulation resistance of the electric control valve shall meet the following requirements: the input terminals of the casing is not less than 20MΩ; each input terminal of the power supply terminals are not less than 50MΩ; power terminals on the casing is not less than 50MΩ. Test Method 500 megger test.
With the rapid development of China's industry, the electric control valve applications in the fields of metallurgy, petrochemical and other more widely, its stability, reliability is becoming more and more important, its working condition is good or bad will directly affect the automatic control process.
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