河源燃烧控制器DKG972-NMOD.28假一赔十

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Vickers威格士859160DG4V30BMUH760DG4V30BMUH760主要区别：1.暗杆法兰闸阀的提升螺杆是只旋转而无上和下移动，外露的只是一根杆，其螺母是固定在闸板上，通过螺杆的旋转来提升闸板，没有可见的门架；明杆法兰闸阀的提升螺杆是外露的，螺母紧贴手轮且是固定的（不旋转也不轴向移动），通过旋转螺杆来提升闸板，螺杆与闸板只有相对的旋转运动而无相对的轴向位移，外观为有门形支架。暗杆阀门就是看不见丝杠，而明杆的就是能看见丝杆的。暗杆阀门在开关时方向盘与阀杆是连接在一起相对不动的，它是通过阀杆在固定点转动来带动阀瓣向上提升和下闸来完成启闭的。