summary
The electric double seat regulating valve is composed of a straight stroke electronic electric actuator and a straight through double seat valve. The electronic electric actuator has functions such as internal servo operation, opening signal position feedback, position indication, manual operation, etc. It is powered by a power source and directly receives control signals such as 4-20mA DC 0-10mA DC or 1-5V DC input from the regulating instrument to control operation, converting the current signal into corresponding linear displacement, Automatically control the valve opening to achieve automatic control of parameters such as working flow rate, pressure, temperature, and liquid level. The ZDLN electric double seat regulating valve has a compact structure, sensitive action, small pressure drop loss, large valve capacity, and precise flow characteristics. The seat valve has the characteristics of small unbalanced force, large allowable pressure difference, and large flow capacity, making it suitable for clean media situations with low leakage requirements and large pressure difference. Widely used in automatic control of industries such as electricity, metallurgy, light industry, food, petroleum, and chemical industry.
principle
The electric double seat regulating valve has a larger excess flow than the electric single seat regulating valve with the same nominal diameter, because the valve seat of the electric double seat regulating valve has two valve cores, upper and lower. The medium flows in from the left side of the valve body and out from the right side after passing through the valve seat and valve core. The flow capacity can be increased by 20% to 25% compared to a single seat valve. When using an electric double seat regulating valve, the force exerted by the medium on the upper and lower valve cores can cancel each other out, resulting in small unbalanced force and large operating pressure difference. However, due to the difficulty of closing both the upper and lower valve cores tightly at the same time, there is a large amount of leakage when closing. However, due to its strong flow capacity, it is allowed to use a pressure difference ratio but with a larger regulating valve, making it suitable for situations with high leakage requirements and differential pressure.
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