The opening and closing part of the stop valve is a plug-shaped valve disc with a flat, conical or spherical sealing surface. The valve disc is driven by the valve stem and moves up and down in a straight line along the valve seat (sealing surface). The opening or closing stroke of the valve stem is relatively short and has a very reliable cut-off action. When the disc (opening and closing part) of the stop valve moves along the axis of the valve seat, the medium in the pipeline can be connected or cut off. Because of the simple structure of the stop valve, and once the stop valve is in the open state, there will be no contact between its seat and the sealing surface of the valve disc, so its sealing surface has less mechanical wear, less friction between the sealing surfaces, longer service life, convenient manufacturing and maintenance, and good adjustment performance, so it is widely used.

截止阀是一种常用的截断阀,主要用来接通或截断管路中的介质,一般不用于调节流量。截止阀适用压力、温度范围很大,但一般用于中、小口径的管道。根据阀体结构不同,截止阀分为直通式截止阀、直流截式止阀、角式截止阀和柱塞式截止阀。近年来,随着军工、核电等行业发展,一些系统中的截止阀要求无泄漏,在填料密封同时增加波纹管密封,双重密封阀门在一些重要系统中保持无泄漏

The stop valve is a commonly used block valve, which is mainly used to connect or cut off the medium in the pipeline, and is generally not used to regulate the flow. The stop valve is applicable to a wide range of pressure and temperature, but it is generally used for medium and small diameter pipes. According to the different structure of valve body, the stop valve is divided into straight-through stop valve, direct-current stop valve, angle stop valve and plunger stop valve. In recent years, with the development of military industry, nuclear power and other industries, stop valves in some systems are required to be leak-free, and bellows seals are added at the same time as packing seals. Double-sealed valves are kept leak-free in some important systems 

直通式截止阀

Globe valve 

止回阀的阀瓣借助介质的作用力而自动开闭,是能自动阻止流体倒流的阀门。用于介质单向流动的管路上。流体从进口侧流向出口侧。当进口侧压力低于出口侧时,阀瓣在流体压差、自身重力等因素作用下自动关闭以防止流体倒流。常用的有旋启式止回阀、升降式止回阀和蝶式止回阀等。

The valve disc of the check valve opens and closes automatically with the help of the force of the medium, which is a valve that can automatically prevent the backflow of the fluid. It is used on the pipeline with one-way flow of medium. The fluid flows from the inlet side to the outlet side. When the pressure at the inlet side is lower than that at the outlet side, the valve disc will automatically close under the influence of fluid pressure difference, self-gravity and other factors to prevent fluid backflow. Commonly used are swing check valve, lift check valve and butterfly check valve.

升降式止回阀可分为立式和卧式两种。旋启式止回阀分为单瓣式、双瓣式和多瓣式

Lift check valves can be divided into vertical and horizontal types. Swing check valve is divided into single-disc, double-disc and multi-disc

种。蝶式止回阀为直通式。旋启式止回阀,其阀体形状与闸阀相似,阀瓣绕固定在阀体上的销轴旋转,以接通或切断管路。

Species. Butterfly check valve is straight-through type. The valve body of swing check valve is similar to that of gate valve. The valve disc rotates around the pin fixed on the valve body to connect or cut off the pipeline.