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.

截止閥是一種常用的截斷閥,主要用來接通或截斷管路中的介質,一般不用于調節流量。截止閥適用壓力、溫度范圍很大,但一般用于中、小口徑的管道。根據閥體結構不同,截止閥分為直通式截止閥、直流截式止閥、角式截止閥和柱塞式截止閥。近年來,隨著軍工、核電等行業發展,一些系統中的截止閥要求無泄漏,在填料密封同時增加波紋管密封,雙重密封閥門在一些重要系統中保持無泄漏

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 

直通式截止閥

Globe valve 

止回閥的閥瓣借助介質的作用力而自動開閉,是能自動阻止流體倒流的閥門。用于介質單向流動的管路上。流體從進口側流向出口側。當進口側壓力低于出口側時,閥瓣在流體壓差、自身重力等因素作用下自動關閉以防止流體倒流。常用的有旋啟式止回閥、升降式止回閥和蝶式止回閥等。

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.

升降式止回閥可分為立式和臥式兩種。旋啟式止回閥分為單瓣式、雙瓣式和多瓣式

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

種。蝶式止回閥為直通式。旋啟式止回閥,其閥體形狀與閘閥相似,閥瓣繞固定在閥體上的銷軸旋轉,以接通或切斷管路。

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.