the kinds of bellows gate valve according to the position of the stem thread with external thread type, internal thread type. According to the flow of medium, have straight-through type, straight and Angle. Cut-off valve, the form of the seal packing corrugated pipe gate valve and bellows seal globe valves. Hand wheel, lever operation of pipe cut-off 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 the body. Corrugated pipe gate valve, also called door and valve is one of the most widely used, 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 valve rod pressure, sealing surface and the Industrial Valves seat valve sealing surface fit closely, prevent medium circulation.

bellows gate valve only unidirectional flow medium, the installation direction. The structure length is greater than the gate, and at the same time fluid resistance is big, long runs, seal reliability is not strong. Bellows gate valve can be divided into three categories: straight through, right Angle type and once-through Angle globe valve. The bellows gate valve opens, the opening of the disc height, is 25% ~ 30% of nominal diameter, flow has reached maximum, said valve to full open position. So stop valve fully open position, should be determined by disc's schedule. 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. The shortcoming of corrugated pipe gate 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.

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