ZAZ series electric single seat, the sleeve valve, adjust the instrument to accept the direct current signal, changing the medium flow is adjusted, the controlled process parameters are kept at a given value. Widely used in the production of automatic control electricity, metallurgy, chemical, petroleum, textile, pharmaceutical, paper and other industrial sectors. This series of products nominal diameter from 20 to 200mm, nominal pressure has 1.0,1.6,4.0,6.4MPa, temperature range from the -40 ℃ ~ 450 ℃, receiving signal is 0 ~ 10mA.DC or 4 ~ 20mA.DC. Wherein electric single seat control valve is suitable for less pressure, medium viscosity or slightly larger particles of impurities occasions. Electric sleeve valve suitable for large pressure situations. Press Trim Material sealing portion have metal - metal and non-metallic - two metal seal, the valve is closed when the latter up to Class VI leakage (zero leakage) standard. Press the filler can be divided into two general packing and bellows seal, the former with the general situation, which is not allowed to use to leakage of important occasions. Flow characteristics such as linear or percentage. Equipped with different actuators can be divided into common type and electronic type two. Varieties to choose from a variety of scale. Features valve designed according to principles of fluid mechanics and other low flow resistance flow channel cross section, rated flow coefficient increases by 30%. Adjustable range, inherent adjustable ratio of 50, the percentage flow characteristics are linear and so on. Electric sleeve valve spool is provided on the bottom of the pressure equalization holes, small unbalanced force, the valve stability, interchangeable sleeve, use a large pressure difference. Adjustment cut-off with soft seal structure spool of Class VI leakage standards (zero leakage). Depth dynamic servo amplifier negative feedback, the automatic adjustment accuracy can be improved. Electric operation takes many forms, suitable for 4 ~ 20mA. DC or 0 ~ 10mA.DC. E-electric control valve can directly control the valve opening by the current signals, no servo amplifier. Bellows seal type valve stem to move form a complete seal, fluid leakage block extinction