Pneumatic butterfly valve operating system principle
The pneumatic butterfly valve is composed of a pneumatic actuator and a butterfly valve for controlling solid materials. It is usually used as a discharge valve at the bottom of the water tank, such as cement tank, stone powder tank, etc., for discharge and quick cutting. Improper selection will greatly reduce the service life of the valve, seriously affect the use.
Therefore, generally in the process of operation, extend the motor vibration time, try to shake out all materials before closing the valve; Adjust the zero point of the weighing instrument, and when all the materials come out, the display is zero. At this time, the PLC sends out the signal to close the valve; Replace the three eccentric butterfly valve with a double eccentric elastic hard seal butterfly valve (also can use a midline seal rubber butterfly valve). Considering the material in the occasional larger particles, rubber seal may not be durable, if it is not fine powder particles, can consider to use soft sealing butterfly valve), because of the triple eccentric butterfly valve seat sealing surface is a tilt, the sealing surface, thus easy to accumulate on the surface of the sealing material, can't discharge quickly, but eccentric single or double eccentric butterfly valve without the disadvantages. Even if there is a small amount of material on the sealing surface, the valve plate will be scraped off when the valve is closed to ensure a good seal and durable sealing surface.
In such a system, there are other factors to consider, such as: when the material cannot be placed directly into the car from above, the static pressure of the material must not exceed the design pressure of the pneumatic butterfly valve, etc.
