截止阀又称球形阀，属于强制密封式阀门，所以在阀门关闭时，必须向阀瓣施加压力，以强制密封面不泄漏。当介质由阀瓣下方进入阀门时，操作力所需要克服的阻力，是阀杆和填料的摩擦力与由介质的压力所产生的推力，关阀门的力比开阀门的力大，所以阀杆的直径要大，否则会发生阀杆顶弯的故障。按连接方式分为三种：法兰连接、丝扣连接、焊接连接。
The globe valve, also known as the globe valve, is a forced sealing valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force the sealing surface not to leak. When the medium enters the valve from the lower part of the valve disc, the resistance to be overcome by the operating force is the friction between the valve rod and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the diameter of the valve rod is larger, otherwise the valve rod will be bent. There are three types of connection: flange connection, screw connection and welding connection.

近几年来，从自密封的阀门出现后，截止阀的介质流向就改由阀瓣上方进入阀腔，这时在介质压力作用下，关阀门的力小，而开阀门的力大，阀杆的直径可以相应地减少。同时，在介质作用下，这种形式的阀门也较严密。我国阀门“三化给”曾规定，截止阀的流向，一律采用自上而下。本阀要水平安装截止阀开启时，阀瓣的开启高度，为公称直径的25%～30%时.流量已达到**大，表示阀门已达全开位置。所以截止阀的全开位置，应由阀瓣的行程来决定。
In recent years, since the emergence of self-sealing valves, the medium flow direction of the stop valve has changed from the top of the valve disc to the valve chamber. At this time, under the medium pressure, the force to close the valve is small, while the force to open the valve is large, and the diameter of the valve rod can be reduced accordingly. At the same time, under the action of medium, this type of valve is also relatively tight. Our country's "three chemical supply" has stipulated that the flow direction of stop valves should be from top to bottom. When the valve is to be installed horizontally, the opening height of the valve disc is 25%~30% of the nominal diameter. When the flow has reached * *, it means that the valve has reached the fully open position. Therefore, the full open position of the stop valve should be determined by the stroke of the valve disc.
以上就是为大家介绍的有关上海良工阀门详细的介绍,希望对您有所帮助.如果您有什么疑问的话,欢迎联系我们.我们将以的态度,为您提供服务http://www.jnlgvf.com
The above is the detailed introduction of Shanghai Lianggong Valve, which I hope will help you. If you have any questions, please contact us. We will provide you with our service http://www.jnlgvf.com