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真空蝶阀在使用过程中仍然存在以下几个问题
真空蝶阀在使用过程中仍然存在以下几个问题：
The following problems still exist in the use of vacuum butterfly valves:
1、由于多层软硬叠式密封圈固定在阀板上，当阀板常开状态时介质对其密封面形成正面冲刷，金属片夹层中的软密封带受冲刷后，直接影响密封性能。
1. Because the multi-layer soft and hard overlapping sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium forms a positive erosion on its sealing surface. The soft sealing belt in the interlayer of metal sheets is eroded, which directly affects the sealing performance.
2、受结构条件的限制该结构不适应做通径DN200以下阀门，原因是阀板整体结构太厚，流阻大。
2. Restricted by structural conditions, this structure is not suitable for making valves with diameters below DN200. The reason is that the overall structure of the valve plate is too thick and the flow resistance is large.
3、因衬胶蝶阀的原理，阀板的密封面与阀座之间的密封是靠传动装置的力矩使阀板压向阀座。正流状态时，介质压力越高密封挤压越紧。当流道介质逆流时随着介质压力的增大阀板与阀座之间的单位正压力小于介质压强时，密封开始泄漏。
3. Because of the principle of rubber-lined butterfly valve, the seal between the sealing surface of the valve plate and the seat is to press the valve plate to the seat by the moment of the transmission device. In the positive flow state, the higher the medium pressure, the tighter the sealing extrusion. When the flow channel medium countercurrent, with the increase of the medium pressure, the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, the seal begins to leak.
The following problems still exist in the use of vacuum butterfly valves:
1、由于多层软硬叠式密封圈固定在阀板上，当阀板常开状态时介质对其密封面形成正面冲刷，金属片夹层中的软密封带受冲刷后，直接影响密封性能。
1. Because the multi-layer soft and hard overlapping sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium forms a positive erosion on its sealing surface. The soft sealing belt in the interlayer of metal sheets is eroded, which directly affects the sealing performance.
2、受结构条件的限制该结构不适应做通径DN200以下阀门，原因是阀板整体结构太厚，流阻大。
2. Restricted by structural conditions, this structure is not suitable for making valves with diameters below DN200. The reason is that the overall structure of the valve plate is too thick and the flow resistance is large.
3、因衬胶蝶阀的原理，阀板的密封面与阀座之间的密封是靠传动装置的力矩使阀板压向阀座。正流状态时，介质压力越高密封挤压越紧。当流道介质逆流时随着介质压力的增大阀板与阀座之间的单位正压力小于介质压强时，密封开始泄漏。
3. Because of the principle of rubber-lined butterfly valve, the seal between the sealing surface of the valve plate and the seat is to press the valve plate to the seat by the moment of the transmission device. In the positive flow state, the higher the medium pressure, the tighter the sealing extrusion. When the flow channel medium countercurrent, with the increase of the medium pressure, the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, the seal begins to leak.
