对焊式电站闸阀

对焊式电站闸阀也有升降旋转杆式（手轮与阀杆一起旋转升降，螺母设在阀体上）。纹管截止阀只适用于全开和全关，不允许作调节和节流。

对焊式电站闸阀简介：

   焊接闸阀的启闭件是塞形的阀瓣，密封面呈平面或锥面，阀瓣沿流体的中心线作直线运动。阀杆的运动形式，有升降杆式（阀杆升降，手轮不升降），也有升降旋转杆式（手轮与阀杆一起旋转升降，螺母设在阀体上）。纹管截止阀只适用于全开和全关，不允许作调节和节流。

对焊式电站闸阀优点：

结构简单，制造和维修比较方便。

工作行程小，启闭时间短。

密封性好，密封面间摩擦力小，寿命较长。

结构简单，制造和维修比较方便。

工作行程小，启闭时间短。

密封性好，密封面间摩擦力小，寿命较长。

对焊式电站闸阀缺点：

流体阻力大，开启和关闭时所需力较大。

不适用于带颗粒、粘度较大、易结焦的介质。

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