Liquefied petroleum gas as pneumatic valve advantages and disadvantages

grain tube by pneumatic valve used throughout opened only close, not allowed to adjust and throttling. Pneumatic valve, pneumatic valve belong to mandatory canned liquefied petroleum gas as in pneumatic valve is closed, so must to pressure pneumatic disc, to force a sealing surface does not leak. When medium by pneumatic disc below 6 into the pneumatic valve, operating force required to overcome resistance, is pneumatic stem and packing of the friction force and the thrust produced by medium pressure, close the pneumatic valve force than the pneumatic valves open force is big, so the larger the diameter of the pneumatic valve stem, otherwise the pneumatic valve stem top bending will happen. Liquefied petroleum gas as pneumatic valve of liquefied petroleum gas by the pneumatic valve opening and closing is plug pneumatic valve, sealing surfaces appear flat or cone, pneumatic disc make linear movement along the centerline of the fluid. Pneumatic valve stem form of exercise, lifting lever ( Pneumatic valve rod and hand wheel lifting) And lift rotating lever ( The handwheel with pneumatic valve rod rotating lifting, nut is located in the pneumatic valve) 。 Grain tube by pneumatic valve used throughout opened only close, not allowed to adjust and throttling. Pneumatic valve, pneumatic valve belong to mandatory canned liquefied petroleum gas as in pneumatic valve is closed, so must to pressure pneumatic disc, to force a sealing surface does not leak. When medium by pneumatic disc below 6 into the pneumatic valve, operating force required to overcome resistance, is pneumatic stem and packing of the friction force and the thrust produced by medium pressure, close the pneumatic valve force than the pneumatic valves open force is big, so the larger the diameter of the pneumatic valve stem, or pneumatic stem top bending failure happens. In recent years, from the seal of the pneumatic valve, the flow direction of medium by the pneumatic valve is replaced by air above the disc into the pneumatic valve cavity, in the medium pressure at this moment, close the pneumatic valve is small, the force and the great strength of pneumatic valve, pneumatic valve stem diameter can be reduced accordingly. At the same time, in the role of media, this kind of pneumatic valve is tight. Pneumatic valve in China 'three for' regulation, by the flow of the pneumatic valve shall be applied. Liquefied petroleum gas as the pneumatic valve opens, the opening of pneumatic disc height, for the nominal diameter % ~ %, traffic has reached maximum, said the pneumatic valve to full open position. So by the pneumatic valve fully open position, should be determined by pneumatic disc trip. Liquefied petroleum gas as pneumatic valve has the following advantages: simple structure, manufacture and maintenance more convenient. Working stroke is small, opening and closing time is short. Good sealing, sealing surface friction between the small, long service life. As the disadvantage of pneumatic valve is as follows: fluid resistance is big, required when opening and closing force is larger. Do not apply to the medium with larger particles, viscosity, easy to coking. Poor regulation performance. Liquefied petroleum gas as the types of pneumatic valve according to the location of the pneumatic valve stem threads with external thread type, internal thread type. According to the flow of medium, have straight-through type, straight and Angle. By the pneumatic valve points, the form of the seal packing seal by the pneumatic valve and pneumatic valve bellows seal globe. Liquefied petroleum gas as pneumatic valve installation and maintenance should be paid attention to the following: the handwheel, handle operation of pipe as pneumatic valve can be installed in any position. The handwheel, handle and wei mechanism, does not allow for lifting. The flow of medium should be consistent with the direction arrow shown in pneumatic valve body. Liquefied petroleum gas by the pneumatic valve, also called door and is one of the most widely used pneumatic valve, it is popular, is due to open and close in the process of friction surface, more durable, opening, manufacturing easy, convenient maintenance, not only suitable for low voltage, and is suitable for high pressure. It is the closing of the principle, rely on the pneumatic valve rod pressure, pneumatic valve sealing surface and the pneumatic valve seat sealing surface fit closely, prevent medium circulation. Liquefied petroleum gas as pneumatic valve only unidirectional flow medium, the installation direction. Its length is greater than the brake the structure of the pneumatic valve, at the same time, fluid resistance is big, long runs, seal reliability is not strong. Line pipe by the pneumatic valve is divided into three categories: straight through, right Angle type and once-through inclined by the pneumatic valve. Grain tube as the pneumatic valve opens, the opening of pneumatic disc height, for the nominal diameter % ~ %, traffic has reached maximum, said the pneumatic valve to full open position. So by the pneumatic valve fully open position, should be determined by pneumatic disc trip. http://www pneumatic pneumatic valve manufacturer. /。