â€œThe weather is cold and the streets are prone to ice after the streets are sprinkling water. Pedestrians are wary of falling.â€ Recently, the citizen Wang suggested that the sanitation department could adjust the working hours of the sprinklers.
In addition, the water pressure of the greening sprinkler is relatively large, affecting people's travel and vehicle driving order.
The person in charge of Lei San, a hot spring sanitation department, said that the sanitation operations are mainly to reduce air pollution and clean up road waste, and generally the temperature will be sprayed above 0Â°C. At present, the urban areas use high-pressure flushers and sewage suction trucks. The sprinklers carry dust and sediments to the side of the road and are cleaned up by sanitation workers. Some heavily polluted sections will also be deployed with sprinklers for cleaning.
At present, urban sprinklers work once in a rainy day and sunny three times. In order to avoid the peak of people's travel, the sanitation department stipulates that the sunny watering truck completes the first sanitation operation before 7 o'clock in the morning, followed by working hours at 9 o'clock and 2 o'clock in the afternoon.
Check Valve, clack valve, non-return valve or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.
Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items. Although they are available in a wide range of sizes and costs, check valves generally are very small, simple, or inexpensive. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. The bodies (external shells) of most check valves are made of plastic or metal.
An important concept in check valves is the cracking pressure which is the minimum upstream pressure at which the valve will operate. Typically the check valve is designed for and can therefore be specified for a specific cracking pressure.
Heart valves are essentially inlet and outlet check valves for the heart ventricles, since the ventricles act as pumps.
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