Pressure closure outlet, also known as reflection valve, is a common pipe connection, widely used in pipeline systems around the world. Its main function is to prevent liquid or gas backflow in the pipeline system and to withstand pressure. In this paper, the pressure closure outlet will be expanded from many aspects, introducing its principle, application field and use in the world.

First of all, the principle of sealing the outlet with pressure is constructed through the valve, so that the liquid or gas can only flow in one direction, and prevent the backflow. Its main components include a seat, a spool and a valve cover. When a liquid or gas enters the seat from the pipe, the spool is pushed open by pressure and the channel opens to allow the fluid to pass through. When the fluid flows in the opposite direction, the spool will be subjected to reverse pressure, so that the spool and the seat closely fit, thus preventing backflow. This design effectively protects the stable operation of the pipeline system.

Pressure closure outlet has a wide range of applications. First of all, in the industrial field, it is widely used in the pipeline system of petroleum, chemical, metallurgy, electric power and other industries. For example, in the oil industry, a pressure plug outlet is often used at the wellhead of an oil well to stop the flow of oil back and protect the stability of the wellhead equipment. Secondly, in municipal engineering, the pressure closure outlet is also commonly used in sewage treatment, water supply pipeline and other systems to ensure that the liquid flows in the right direction to avoid backflow and pollution.

The use of pressure sealed outlets is also very common around the world. For example, in the United States, it is widely used in pipeline systems in the oil, gas and chemical industries. In Europe, it is widely used in various industrial fields, such as oil refining, chemical industry, food processing and so on. In Asia, the pressure closure outlet is also widely used in petrochemical, water treatment, municipal engineering and other industries.

However, although the pressure closure outlet plays an important role in many fields, it also has some shortcomings. First of all, due to the fit of the spool and the seat, when the liquid or gas passes through, it will produce a certain resistance, thereby reducing the flow of fluid. Secondly, the outlet with pressure sealing is vulnerable to damage in high pressure environments and needs regular maintenance and replacement. In addition, its high cost may not be economical for some small projects.

In summary, the pressure closure outlet is a widely used pipe connection in the world, which has an important role in preventing backflow. Its principle is simple, the application field is wide, is widely used in petroleum, chemical, municipal engineering and other industries. Although there are some shortcomings, with the progress and improvement of technology, the performance of the pressure closure outlet will continue to improve, providing better protection for the pipeline system in all walks of life.