As of pneumatic valve has the following advantages

pneumatic valve opening and closing is plug piece of pneumatic valve, sealing surface or cone, along the centerline of disc of the liquid in a straight line. Trunk and lifting lever ( Dry down, hand wheel lifting) Exercise, and rotating lifting lever ( With hand wheel and the rotation of the pneumatic valve rod lifting, nut in pneumatic valve body. ） Pneumatic valve is only applicable to all seated, tu shall not adjust and spending cuts.
pneumatic valve is forced to close the pneumatic valve, pneumatic valve is closed, the pressure on the disc must, forced sealing surface does not leak. When from the bottom of the pneumatic valve to valve 6, the business needed to overcome resistance, stems and friction and media pressure generated by the packing, the thrust close the pneumatic valves, pneumatic valves open than force, therefore, stem diameter, or stem bending failure. In recent years, since the sealing pneumatic valve, pneumatic valve, in order to change the way that the media stream pneumatic valve to the top of the pneumatic valve cavity, when the medium pressure, close the pneumatic valve is small, the force and the force open the pneumatic valve, stem diameter can be reduced correspondingly. At the same time, the role of the media, this kind of pneumatic valve is also closer. China's 'three to' flow pneumatic valve pneumatic valve, all the provisions of the top-down.
the pneumatic valve is fully open, the height of pneumatic valve opens, between % % of nominal diameter, flow has been achieved, the pneumatic valve has reached the highest fully open position. Pneumatic valve in full open position, therefore, pneumatic valve stroke should be determined.
brake pneumatic valve has the following advantages:
simple structure, manufacture and maintenance more convenient. Working stroke is small, opening and closing time is short. Sealing, sealing surface friction between the small, long service life. Brake the shortcoming of pneumatic valve is as follows:
fluid resistance is small, the force required to open and close more. Do not apply to particles, viscosity, easy to medium coke. Poor regulation performance. Pneumatic valves according to the kinds of pneumatic valve stem thread male classification, thread type. Divided by the flow medium, cut-through, once-through and Angle type. Divided by the pneumatic valve seal, packing seal bellows seal pneumatic valve and the form of the pneumatic valve.
brake pneumatic valve installation and maintenance should be paid attention to the following:
the handwheel, handle operating pneumatic valve can be installed in the pipeline in any position. The handwheel, handle and wei, are not allowed to reuse. In the flow direction of the arrow, as suggested by the media should be consistent with the body.