The application of exhaust valve in engineering is of great significance

In order to solve a series of accidents in the pipeline network and improve the efficiency of water supply, it is necessary to discharge the pipeline gas. In response to this topic, the article describes the hazards of pipeline gas and proposes effective solutions. The performance and efficacy of the new generation of exhaust products-Smart Exhaust King are summarized. There are three problems that plague water industry workers:

First, in urban water supply, the water supply efficiency of the pipe network is low. The main reason for this is that there are a large number of unexhausted gas in the pipeline, which forms an air bag floating on the upper wall of the pipeline, so that the flow cross section of the pipeline becomes smaller, the effective water supply is reduced, and the water supply efficiency is low. As a result, residents in individual counties and towns turned on the taps, and the gas was discharged first, and then a trickle came out. While bringing inconvenience to residents, it also affects the economic benefits of water supply enterprises to a certain extent. The author has heard similar complaints.

The second is a common accident in water supply pipelines-pipe bursts. In fact, from a certain point of view, the main cause of pipe bursting is also related to the silting of gas in the pipe. The pipe gas is rich in oxygen and adheres to the inner wall of the pipe, oxidizing the iron pipe, resulting in rust that gradually falls off, causing the upper pipe wall to become thinner and unable to withstand the corresponding nominal pressure, causing the pipe to burst. This is a long-term oxidation reaction. Due to the existence of airbags, rapid opening and closing of valves or pumps can also cause pipe bursts. This is because the opening and closing of valves or pumps changes the flow rate of the medium, causing a large pressure increase in the pipeline. The compressible characteristics of the gas cause stress concentration. When the airbag generates high pressure, the tube bursts. According to the case study of the tube burst, the height of the airbag reaching one-fourth of the tube diameter is the dangerous point of the tube burst, which is the critical point of the airbag. While the pipe burst affects citizens' water use, it also has a certain social impact. This is also a headache for the person in charge of the water supply company.

The third is a common accident in pipelines-water hammer. In the long-distance pressure water delivery project, the pipeline is long and the flow rate is large. The flow velocity in the pipe is generally large. There are many undulations along the main pipeline. In the long-distance water delivery project, multiple water column separations often occur and cause the flow to bridge the water hammer. The water column separation is precisely because the liquid water vaporizes when the pressure somewhere in the pipeline drops below the vaporization pressure of the water temperature at that time. However, the gas is not discharged. When the two water columns are re-bridged, due to the violent collision between the two water columns, a high-pressure cut-off cavity with direct water hammer characteristics will be generated to bridge the water hammer. Its hazards may cause the pump room to be flooded, or even unmanned monitoring pipelines have a large amount of long-term leakage, flooding large areas of fertile land.