在管道系统中，倒置连续阀是控制元件，就像人的手一样，无论在生活中还是在各行各业中，其重要性不言而喻。
它的功能是什么？如何安装？下面就和大家一起来了解一下吧！
倒置连续阀的四大功能
1. 切断和开放培养基
流道为直通倒置连续阀，流阻小。通常选用倒置式连续阀来切断和开启介质。
下闭式倒置连续阀（截止阀、柱塞阀）由于其流道曲折，流动阻力比其他倒置连续阀高，故较少使用。在允许较高流动阻力的情况下，可以使用封闭的倒置连续阀。
2. 控制流程
通常选用易于调节流量的倒置连续阀作为控制流量。下闭式倒置连续阀（如截止阀）适用于此用途，因为其阀座尺寸与关闭件的行程成正比。旋转倒连续阀（旋塞阀、蝶阀、球阀）和柔体倒连续阀（夹管阀、隔膜阀）也可用于节流控制，但通常只适用于有限的倒连续阀直径范围内。
闸阀采用圆盘形闸板对圆形阀座开口作横切运动。它只有在接近关闭位置时才能更好地控制流量，因此通常不用于流量控制。
3、倒车调车
根据换向和分流的需要，这种倒置连续阀可具有三个或更多通道。旋塞阀和球阀更适合此用途。因此，用于换向和分流的倒置连续阀大多使用这些倒置连续阀中的一种。
但是，在某些情况下，也可以使用其他类型的倒连续阀进行换向和分流，只要两个或多个倒连续阀相互正确连接即可。
4. 有悬浮颗粒的介质
当介质中有悬浮颗粒时，最适合使用对关闭件沿密封面滑动具有擦拭作用的倒置连续阀。
If the back and forth movement of the closing member to the valve seat is vertical, it may hold particles. Therefore, this inverted continuous valve is only suitable for basic clean media unless the sealing surface material allows particles to be embedded. Ball valves and plug valves have a wiping effect on the sealing surface during the opening and closing process, so they are suitable for use in media with suspended particles.
Installation problem of inverted continuous valve
Check before installation
1. Carefully check whether the model and specifications of the inverted continuous valve meet the requirements of the drawing.
2. Check whether the valve stem and valve clapper open flexibly, whether there is jamming or skewing.
3. Check whether the inverted continuous valve is damaged, and whether the thread of the inverted continuous valve is straight and intact.
4. Check whether the combination of the valve seat and the valve body is firm, the connection of the valve disc and the valve seat, the valve cover and the valve body, and the valve stem and the valve disc.
5. Check whether the gasket, packing and fasteners (bolts) of the inverted continuous valve are suitable for the requirements of the nature of the working medium.
6. The pressure reducing valve that is outdated or left for a long time should be disassembled, and debris such as dust and sand should be cleaned with water.
7. Remove the port seal and check the degree of sealing. The valve disc must be closed tightly.
General regulations for installation
1. The installation position of the inverted continuous valve should not hinder the operation, disassembly and maintenance of the equipment, pipeline and valve body itself, and the aesthetic appearance of the assembly should be considered.
2. For the inverted continuous valve on the horizontal pipeline, the valve stem should be installed upwards, or installed at a certain angle, and the handwheel cannot be installed downward. The inverted continuous valve, valve stem and hand wheel on the high-altitude pipeline can be installed horizontally, and the opening and closing of the valve can be remotely controlled by a vertical low chain.
3. The arrangement is symmetrical, neat and beautiful; the inverted continuous valve on the riser, if the process permits, the handwheel of the inverted continuous valve is most suitable for operation with chest height, generally 1.0-1.2m from the ground, and the valve stem must be Follow the direction of the operator to install.
4. Inverted continuous valves on side-by-side vertical pipes should have the same centerline elevation, and the clear distance between handwheels should not be less than 100mm; inverted continuous valves on side-by-side horizontal pipes should be installed staggered to reduce the pipe spacing.
5. When installing heavy inverted continuous valves on water pumps, heat exchangers and other equipment, an inverted continuous valve bracket should be installed; when the operation is frequent and the inverted continuous valve is installed more than 1.8m away from the operating surface, a fixed Operating platform.
6. There is an arrow mark on the valve body of the inverted continuous valve, and the direction of the arrow is the flow direction of the medium. When installing an inverted continuous valve, make sure that the arrow points in the same direction as the medium flow in the pipeline.
7. When installing the flange inverted continuous valve, ensure that the end faces of the two flanges are parallel and concentric with each other, and double gaskets are not allowed.
8. When installing a threaded inverted continuous valve, in order to facilitate disassembly, a threaded inverted continuous valve should be equipped with a union. The setting of the union should consider the convenience of maintenance. Usually, the water flows through the inverted continuous valve first and then flows through the union.
Installation Precautions
1. The body material of the inverted continuous valve is mostly made of cast iron, which is brittle, so it must not be hit by heavy objects.
2. When carrying the inverted continuous valve, it is not allowed to throw it at will; when lifting or hoisting the inverted continuous valve, the rope should be tied to the valve body, and it is strictly forbidden to tie it to the handwheel, valve stem and flange bolt holes.
3. The inverted continuous valve should be installed in the most convenient place for operation, maintenance and overhaul, and it is strictly prohibited to be buried in the ground. The inverted continuous valve on the pipeline in the direct buried and underground trenches shall be provided with an inspection well to facilitate the opening and closing and adjustment of the inverted continuous valve.
4. Ensure that the threads are intact and undamaged, and wrap the threads with hemp, lead oil or PTFE tape. When screwing, a wrench should be used to clamp the hexagonal valve body screwed into one end of the pipe.
5. When installing the flange inverted continuous valve, pay attention to tighten the connecting bolts diagonally, and use even force when screwing, to prevent the gasket from running off or causing deformation and damage to the valve body.
6. The inverted continuous valve should be kept closed during installation. For the threaded inverted continuous valve close to the wall, it is often necessary to remove the valve stem, disc and handwheel during installation before turning it. When disassembling, you should turn the handwheel to keep the inverted continuous valve open before disassembling.
Related Recommendations
How to choose a 20mm aerosol valve?
Internal thread aerosol valve and external thread aerosol valve
