Electronic electric single-seat and double-seat control valves are composed of straight-stroke electronic electric actuators and straight-through double-guided single-seat and double-seat valves. It has compact structure, sensitive action, small pressure drop loss, large valve capacity, and accurate flow characteristics. It can directly accept control signals such as (4-20mA DC 0-10mA DC or 1-5V DC) input from the regulating instrument and single-phase power supply. Control operation and realize automatic adjustment and control of fluid media in process pipelines. It is widely used to accurately control the process parameters of gas, liquid, steam and other media such as pressure, flow, temperature, liquid level and other parameters to maintain at given values.
The double-seat regulating valve is the execution unit of the instrument in the automatic control system. It is powered by AC220V power supply voltage and accepts input from DCS, PLC system or regulating instrument, operator, etc. (4-20mA, 0- 10mA or 1-5VDC) current signal or voltage signal can control the operation. It adopts a mechatronic structure and has functions such as in-machine servo operation and opening signal position feedback, position indication, and manual operation. It has strong functions, reliable performance, and connectivity. The line is simple and the adjustment accuracy is high. The thrust output by the straight stroke changes the valve opening displacement to achieve precise adjustment and control of the process parameters of the fluid medium.
2． Double-seat control valves can be divided according to the mode of action;
Positive action: electrically closed-normally open type (the valve position moves downward when the electrical signal increases), "Type B"
Reaction: Electrically open type - normally closed type (the valve position moves upward when the electrical signal increases), "K type"
3. ZDLN electronic electric double-seat control valve is a straight-through double-seat cast spherical valve with a double-seat plunger valve core. It is suitable for medium with large pressure difference, large flow rate and not very clean, and situations where leakage requirements are not strict
4． The ZDLN electric double-seat control valve has a straight-through low flow resistance double-seat upper and lower double-guide structure. The valve core is stable and reliable during the displacement process. The double-seat valve body is composed of two valve cores and seats. The fluid medium passes through the upper and lower valves. The core valve seat flows out, has large flow rate, large allowable pressure difference, and small unbalanced force. It is a balanced structure double-seat valve
5. By changing the design of the valve core shape; different valve core shapes will obtain different flow characteristic values: equal percentage (logarithmic) characteristics, linear characteristics
This series of products are widely used in chemical industry, petroleum, metallurgy, and power stations Automated regulation and remote control of industrial production processes such as textile, papermaking and pharmaceuticals.
There are standard type, bellows sealed type, jacket insulation type and other varieties. Product pressure levels are PN1.6 4.0 6.4MPa; nominal diameter DN20~300mm; applicable fluid temperature is -100~500℃; different valve covers are equipped according to the temperature, which can be divided into normal temperature type, high temperature type and low temperature type