In many cases, there is a certain difference in the opening degree when operating the electric valve on the pneumatic valve. Today we will introduce to you in detail the opening between the electric valve and the pneumatic valve: the electric valve is the motor As the power of the opening and closing valve, it is generally used on large-diameter butterfly valves and ball valves, and can be used as an important control component in industrial control fields such as refrigeration of various papermaking petrochemical power plants.
Electric valves have the advantages of easy assembly, low failure rate and meeting the automation needs of the industry, making them a more cost-effective choice for owners. Because of the use of conventional conventional pneumatic valves, piping and solenoid valve compressors are used together. In the mastery of the continuous opening degree control and opening calculation method of the valve without continuous opening degree, the control precision of the valve is improved, and the electric valve can meet the requirements of various industrial occasions. The stepping PID controller electric valve opening degree control uses the controller to calculate the error value of the set value and the measured value to obtain the increased or decreased value of the valve position, and then outputs the pulse signal, and then the signal The drive motor rotates forward or reverse to achieve the purpose of controlling the valve. The controller does not require any output signal when the valve is to be held in a position.
The type of electric valve can be divided into non-opening feedback according to the type of opening feedback. Only two points are open or closed, and there is continuous opening feedback. In particular, valves with continuous opening feedback are ideal for valve manufacturers and operators, but for now. For the same type of valve, the valve cost of the unique continuous feedback is much higher than the feedback valve at the five opening and two points. Therefore, the five-continuous opening feedback valve is compensated by the general equipment, so that their continuous opening feedback is an effective method. The structural principle of the plug valve is basically based on the plug sealed in the tapered plug body. There is a passage in one direction of the plug. The valve is opened and closed as the plug is screwed into the valve seat.
The structural principle of the butterfly valve is basically based on the disc fixed to the shaft center. In the closed position, the disc is completely sealed from the valve seat. When the disc rotates (around the valve stem) and is parallel to the flow of the fluid, the valve is in the fully open position. Conversely, when the disc is perpendicular to the flow of the fluid, the valve is in the closed position. The structural principle of the ball valve is basically based on a polishing core (including the passage) sandwiched between the two seats (upstream and downstream), the rotation of the center of the ball intercepts or flows through the core, and the pressure difference between the upstream and downstream The resulting force keeps the core against the downstream seat (floating ball structure). Pneumatic valves use a pneumatic actuator and cylinder to maintain the valve's policy work, with a good use of control media. The electric valve is mainly driven by the motor as the valve. The installation is simple, time-saving and labor-saving, and the installation of the electric valve can be quickly installed with the original line of the factory.
This saves a part of the installation fee. The electric valve is naturally opened with a motor that is relatively heavy. By using such a driving method, the shortcomings of no excessive instantaneous force can be solved, and various failures are greatly reduced and reduced. Many customers think that the adaptation and production of electric valves is more expensive, in fact, the opposite. If the overall calculation, the traditional valve to add a lot of accessories and pipeline installation, the price is not dominant, but to bear more maintenance costs. Therefore, the prospect of electric valve is relatively broad. Ringing, always maintaining a high torque during the rest of the operation.
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