Pneumatic diaphragm control valve has the advantages of compact structure, light weight, sensitive operation, fluid passage is streamlined, low pressure loss, valve capacity, precise flow characteristics, convenient assembly and disassembly. Widely used in precise control of gases, liquids, steam and other media, process parameters such as pressure, flow, temperature, liquid level remain at a given value.
Pneumatic diaphragm control valve features the following 9 points are as follows: 1. The input and output characteristics of the actuator of the pneumatic diaphragm control valve show a linear relationship, and the linear relationship between the output displacement and the input signal pressure. The output displacement is called the stroke and is displayed by the stroke display board. Some reaction actuators also install a valve position indicator on the top of the bellows to indicate the valve position. The strokes of the actuators for domestic pneumatic diaphragm regulators are available in six sizes: 10mm, 16mm, 25mm, 40mm, 60mm, and 100mm.
2. The effective area of ​​the diaphragm of the actuator is proportional to the thrust. The larger the effective area, the greater the thrust of the actuator.
3. The structure of the positive and negative acting actuators is basically the same, consisting of the upper film cover, the lower film cover, the film diaphragm, the push rod, the spring, the adjustment parts, the bracket and the travel display board.
4. The main difference between the positive and negative acting actuator structure is that the input signal of the reaction actuator is in the lower part of the bellows, and the push rod is also in the lower part. Due to the good sealing of the diaphragm, there is no need to seal the valve stem.
5. The initial force of the spring can be changed through the adjustment of the adjustment member, thereby changing the thrust of the actuator.
6, pneumatic diaphragm control valve can be added to the self-locking device to achieve control valve self-locking and retention.
7, can add a valve positioner, valve position detection and feedback, improve control performance.
8, pneumatic diaphragm control valve can be added to the displacement conversion device, the linear displacement is converted to angular displacement, used to rotate the valve body.
9. Pneumatic diaphragm control valve can add handwheel mechanism. When the automatic control fails, the handwheel is used for degraded operation to improve system reliability.
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