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Which is better, gate valve or ball valve

Posted by Bundor valve
Which is better, gate valve or ball valve?There is no answer to this question, because gate valve and ball valve are two different valves, the applicable working conditions are not quite the same, if you have to ask whether gate valve or ball valve is better, General valve will introduce you the advantages and disadvantages of the two inventions, we compare by ourselves.
gate valve,ball valve
Advantages of gate valve:
1, small flow resistance, the valve body internal medium channel is straight, the medium into a straight line flow, flow resistance is small.
2, the opening and closing time is less effort, compared with the globe valve, because whether open or close, the movement direction of the gate and the direction of the flow of the medium are perpendicular.
3, High height, long opening and closing time, the opening and closing stroke of the gate is large, and the lifting is carried out by screw.
4, water hammer phenomenon is not easy to produce, the reason is long closing time.
5, the medium can flow in any direction on both sides, easy to install, gate valve channel on both sides is symmetric.
Disadvantages of gate valves: the sealing surface is easy to cause erosion and abrasion, and maintenance is difficult.The external size is large, it needs certain space to open and close, and the opening and closing time is long.The structure is more complex.
Advantages of ball valve:
1. Have the lowest flow resistance (actually 0);
2. It can be reliably applied to corrosive media and low-boiling liquids because it will not get stuck when working (without lubricant);
3. Complete sealing can be achieved within a large pressure and temperature range;
4. Fast opening and closing can be realized, and the opening and closing time of some structures is only 0.05~0.1s, so as to ensure that it can be used in the automation system of the test bench.When the valve is opened and closed quickly, there is no impact in operation;
5. The spherical shutoff can be automatically positioned on the boundary position;
6. Reliable sealing of working medium on both sides;
7. When fully open and fully closed, the sealing surface of the ball and valve seat is isolated from the medium, so the medium passing through the valve at high speed will not cause the erosion of the sealing surface;
8, all welded valve ball valve body, can be buried directly in the ground, so that the valve inner parts are not corroded, the maximum service life can be up to 30 years, is the oil, natural gas pipeline the most ideal valve.
Disadvantages of ball valves: Seat ring material polytetrafluoroethylene has a low temperature resistance class and can only be used in the case of less than 180C.Beyond this temperature, the sealing material will age.In the case of long-term use, it is generally only used at 120℃.