为对系统中的工作介质参数(压力、温度和浓度等)进行控制,常需装设以介质本身为动力的直接作用或调节阀。通带我们力求介质参数的少量变化就能导致获得相当的阀门调节量,为此调节阀常有活塞式的放大执行机构。下面介绍一种新的以漂浮的球形关闭件为执行机构的调节阀。 In order to control the working medium parameters (pressure, temperature and concentration) in the system, it is often necessary to install a direct action or regulating valve powered by the medium itself. Passing through a small amount of variation in the medium parameter can lead to a considerable amount of valve adjustment, for which control valves often have piston-type actuators. The following describes a new spherical actuator with a floating float valve actuator.