The primary performance parameters and testing criteria for electric control valves 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 fluctuations, environmental temperature variations, insulation resistance, dielectric strength, and more. Among these, the first ten performance metrics share similarities with those of pneumatic valves. In particular, the factory inspection items related to the initial ten indicators—basic error, hysteresis, dead band, leakage, sealing, appearance, damping characteristics, power supply voltage changes, and insulation resistance—are evaluated using comparable methodologies.
Here’s an overview of the requirements and testing procedures for three critical aspects:
1) **Damping Characteristics**: For electric control valves, damping characteristics ensure smooth operation. In both forward and reverse directions, the stem movement should not exceed three "half-cycles" of oscillation. To test this, apply input signals at 20%, 50%, and 80% of the signal range and observe the corresponding positions of the valve stem during both strokes to count the number of "half-cycles."
2) **Power Supply Voltage Fluctuations**: Electric control valves must maintain consistent performance when the supply voltage varies within the range of 220 ± 20–30V. The stem displacement under these conditions should not exceed 1.5% of the full stroke. Testing involves measuring the stem's travel at 20% of the signal range with an input voltage of 220V, then adjusting the voltage to 190V and 240V to record any changes. Repeat the process for signals at 50% and 80%.
3) **Insulation Resistance**: At temperatures between 10°C and 35°C and with relative humidity not exceeding 85%, the insulation resistance of electric control valves must meet specific standards: at least 20MΩ between input terminals and the chassis; at least 50MΩ between each input terminal and the power supply terminal; and at least 50MΩ between power terminals and the chassis. This is measured using a 500-megohm meter.
These tests ensure that electric control valves operate reliably across varying conditions while maintaining precise control and durability. Additional considerations like sealing integrity, temperature resilience, and long-term stability further enhance their functionality and safety.
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