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Overview of ball valves
The author: Time:2019/9/10

        球阀的概述
        球阀(ball valve)亦称“ 球形阀”。阀体为球形、活门为圆筒形的一种阀门。开启时,过水流道是一个圆筒,其断面面积与钢管的断面相等,故阀门对水流的阻力极小。关闭时,活门旋转90截断水流,并由活门上一块可动的球面圆板密封盖在水压推动下压紧在阀体上,形成严密的水封。用作水轮机进水阀的球阀可动水关闭,但需静水平压才能开启,只有全开和全关两个工作状态,不允许部分开启来调节流量。优点是开启时水力损失小,关闭时漏水少,密封面不易磨损,阀门操作力小。但结构复杂,笨重,造价高。一般用于高水头。
 

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