grain tube cut-off valve belongs to compulsory sealed valve, the valve is closed, must be pressure on the disc, to force a sealing surface does not leak. When medium by disc below into the body, operating force needed to overcome resistance, is stem and packing of the friction force and thrust produced by medium pressure, close the valve strength is stronger than open the valve, so it's bigger, the diameter of the stem or stem top bending failure happens.

in recent years, from the seal valve, cut-off valve is replaced by the disc above the medium flow direction into the valve cavity, in medium pressure at this moment, close the valve of the force is small, and the strength of the valve, the Industrial Valves stem diameter can be reduced accordingly. At the same time, in the role of media, this kind of valve is tight. Our valve & quot; Order to & quot; Has rules, the flow of cut-off valve, shall be applied.

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. Electric gate valve response is sensitive, safe and reliable, many factory of high control requirements for pneumatic instrumentation control components set the compressed air station. Electric is to electricity. And can control the flow of the device.

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. Bellows gate valve type 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.

ductile iron gate valve cast iron gate valve, as the name suggests, find extensive use in cast iron valve institutions. Since resilient gate valve has become much dependent on technology in today's world, there is wide use of such flow control valve.
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