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The valve is a control component in the fluid conveying […]
The valve is a control component in the fluid conveying system. It has the functions of intercepting, regulating, diverting, preventing backflow, stabilizing, diverting or overflowing and relieving pressure.
The gate valve is used as a cut-off medium, and the whole flow is straight when it is fully opened. At this time, PVC Ball Valve the pressure loss of the medium is minimal. 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 use as regulation or throttling. For high-speed flowing medium, the gate may cause vibration of the gate under the condition of partial opening, and the vibration may damage the sealing surface of the gate and the valve seat, and the throttling will cause the gate to suffer the erosion of the medium. The gate valve can be applied to low temperature pressure or high temperature and high pressure, but it is generally not used in pipelines that transport mud and other media.
Advantages: ① small fluid resistance; ② small torque required for opening and closing; ③ can be used in the ring network pipeline where the medium flows in both directions, that is to say, the flow direction of the medium is not restricted; ④ When fully opened, the sealing surface is affected by the work The erosion of the medium is smaller than that of the stop valve; ⑤The body structure is relatively simple, and the manufacturing process is better; ⑥The structure length is relatively short.
Disadvantages: ①The size and opening height are large, and the space required for installation is also large; ②In the process of opening and closing, the sealing surface is relatively rubbed by people, and the abrasion is large, and it is easy to cause abrasion even at high temperatures; ③ Generally, the gate valve has two sealing surfaces, which adds some difficulties to processing, grinding and maintenance; ④The opening and closing time is long.