| 纹管截止阀属于强制密封式阀门 |
| 添加时间：2019/12/31 16:15:10 浏览次数： |
| 纹管截止阀属于强制密封式阀门，所以在阀门关闭时，必须向阀瓣施加压力，以强制密封面不泄漏。当介质由阀瓣下方进入阀体时，操作力所需要克服的阻力，是阀杆和填料的磨擦力与由介质的压力所产生的推力，关阀门的力比开阀门的力大，所以阀杆的直径要大，否则会发生阀杆顶弯的故障。近年来，从自密封的阀门出现后，截止阀的介质流向就改由阀瓣上方进入阀腔，这时在介质压力作用下，关阀门的力小，而开阀门的力大，阀杆的直径可以相应地减少。同时，在介质作用下，这种形式的阀门也较严密。 The corrugated pipe stop valve belongs to the forced sealing valve, so when the valve is closed, the pressure must be applied to the valve disc to force the sealing surface not to leak. When the medium enters the valve body from the bottom of the disc, the resistance to be overcome by the operating force is the friction force of the valve rod and packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the diameter of the valve rod should be larger, otherwise the valve rod will be bent. In recent years, since the appearance of self sealing valve, the flow direction of medium in the stop valve has changed from the top of the valve disc to the valve chamber. At this time, under the medium pressure, the force to close the valve is small, while the force to open the valve is large, and the diameter of the valve rod can be correspondingly reduced. At the same time, under the action of medium, this type of valve is also tight. |
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