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A gate valve refers to a valve in which the closing member (gate) moves along the vertical direction of the centerline of the passage.
The gate valve is mainly used for cutting off in the pipeline.
Gate valve is a widely used valve. Generally, cut-off devices with a diameter of DN≥50mm are selected for use, and sometimes gate valves are also used for cut-off devices with a small diameter.

A pneumatic valve is an executive unit in a fluid control system in the industrial automation field. It is a combination of a pneumatic actuator and a valve, and when the actuator is driven by the air source pressure to control the operation of the valve. This chapter mainly describes It is a commonly used rotary switch type pneumatic valve.

There are mainly the following types of valves commonly used in sugar factories. 1. Globe valve (ball valve, ball valve) Because the shut-off valve can accurately adjust the flow rate and cut off the channel tightly, it is the main opening and closing device on the sugar liquid and steam pipelines, and can also be …

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The valve is a control component in the pipeline fluid conveying system. It is used to change the passage section and the flow direction of the medium. It has the functions of diversion, cutoff, throttling, check, diversion, or overflow pressure relief. There are two reasons for the damage to the sealing surface: man-made damage and natural damage. Man-made damage is caused by factors such as poor manufacturing, improper selection of materials, improper installation, poor use, and ineffective maintenance. Natural damage is the wear of the valve under normal working conditions and the damage caused by the inevitable corrosion and erosion of the sealing surface of the medium.

The gate valve is used as a cut-off medium, and the whole flow is straight when it is fully opened. At this time, the pressure loss of the medium is small. Gate valves are usually suitable for working conditions that do not need to be opened and closed frequently and keep the gate fully open or fully closed. Not suitable for fine-tuning or throttling.

The sealing pair of the sealed butterfly valve has a metal-to-metal hard seal and a metal-to-rubber or plastic soft seal. The sealing ring can be placed on the butterfly plate or on the valve body. According to the position of the butterfly plate in the valve, butterfly valves are divided into centerline butterfly valves, single eccentric butterfly valves, double eccentric butterfly valves, and triple eccentric butterfly valves. This article will briefly introduce their structural characteristics and applications.

Keywords: South Small North Big ，South High North Low ，South New North Old.