The primary performance and testing criteria for an electric control valve include key indicators such as basic error, hysteresis, dead band, rated stroke deviation, leakage, sealing, compressive strength, appearance, rated flow coefficient, inherent flow characteristics, resistance, vibration, temperature, long-term reliability, explosion-proof capability, damping characteristics, power supply voltage variations, environmental temperature changes, insulation resistance, and dielectric strength. Among these, the first ten performance indicators and their testing methods align closely with those of a pneumatic valve. Specifically, the factory test items involving basic error, hysteresis, dead band, leakage, sealing, appearance, damping characteristics, power supply voltage variation, and insulation resistance share similar requirements and methodologies. Below are detailed descriptions of three critical performance standards and their respective testing procedures:
1) **Damping Characteristics**: For an electric control valve, the damping characteristics must ensure that oscillations during both forward and reverse movement of the stem do not exceed three "half-cycles." To conduct this test, input signals at 20%, 50%, and 80% of the signal range, then observe the stem's behavior during both positive and reverse strokes to count the number of "half-cycles."
2) **Power Supply Voltage Variation**: When the voltage of the electric control valve fluctuates between 190V and 240V (within ±20% of the nominal 220V), the stem's displacement should remain within 1.5% of its full stroke. This is tested by measuring the stem's travel at 20% signal input under 220V conditions, then repeating the measurement at 190V and 240V. Repeat the process for 50% and 80% signal inputs.
3) **Insulation Resistance**: At temperatures ranging from 10°C to 35°C and relative humidity below 85%, the electric control valve must maintain specific insulation levels: no less than 20MΩ between input terminals and the chassis, no less than 50MΩ between any input terminal and the power supply terminal, and no less than 50MΩ between power terminals and the chassis. Testing involves using a 500-megohm meter to verify these values.
These specifications are crucial for ensuring the reliability and functionality of electric control valves across various operational conditions. Additional considerations may involve stress testing under extreme environmental factors or prolonged usage scenarios to confirm long-term durability.
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