| ◎闸阀剖面图 Sectional Drawing of Gate Valve | |
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◎闸阀，也叫闸板阀、闸门阀是指关闭件（闸板）沿通路中心线的垂直方向移动的阀门。用于接通或截断介质。 ◎Gate valve is a valve with the disk moving vertical with the centre-axis of valve seat when it works. It's mainly used in connecting and stopping medium. 优点： 1、流体阻力小 2、开闭所需外力较小 3、介质的流向不受限制 4、全开时，密封面工作介质的冲蚀比截止阀小。 Advantages: 1.***all resistance with the fluid. 2.***all force is needed when open and close the valve. 3.Unlimited direction of flow medium. 4.Resistance between the working medium and the sealing surface is ***aller than that of stop valve's when the valve is opened completely. |
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◎闸阀应用建议 Suggesti*** on Application of Gate Valve 1、管螺纹连接的闸阀与管端的管螺纹相连接须控制管端外长度尺寸，以免管端过量旋入以致顶压闸阀管螺纹内端面，造成阀座变形而影响密封性。 2、黄铜闸阀的公称压力：1.6MPa，2.0MPa，金属密封的介质温度: -20℃~180℃。当闸阀用于饱和蒸汽时，饱和蒸汽压力≤0.6MPa。 3、为延长闸阀的使用寿命，闸阀应作全开和全关使用，不宜部分开启作节流使用，因为部分开启时，流动着的介质会冲蚀密封面，从而影响密封性。 4、 硬密封不宜装在终端。 1、IIf the gate valve with pipe thread connection is connected with the pipe threads on the pipe end, it is necessary to control the external length of the pipe end in order to ***oid excessive screwing in, which will pressurize internal end face of the pipe threads of the gate valve and result in deforming of the valve seat and damage its sealing performance. 2、NNominal pressure of brass gate valve is 1.6MPa ，2.0MPa，medium temperature for metal seal is -20℃~180℃. When the gate valve is used for saturated steam, the pressure of the saturated steam should be ≤0.6MPa. 3、TTo increase the service life of a gate valve, it should be fully opened or closed instead of partial opening for throttling purpose, as when it is partially open, the flowing medium will erode the ball and sealing surface and thus affect the sealing performance. 4、Hard seal is unsuitable to be mounted at the terminal. |