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The main functions of the sprinkler are air purification, dust prevention on roads, summer cooling and cooling, etc. There are also some multi-function sprinklers, which also have some special functions such as pesticide spraying, aerial work, fire fighting operations, etc., while they have the function of watering. This is a functional part that is relatively easy to define. It is more difficult to control the amount of sprinkler spraying.
There is no standard data on the amount of water sprayed on the sprinkler. The actual operation depends on a weather condition and road conditions when the sprinkler is sprayed. When the dust is large and the road surface is dry, it is necessary to increase the sprinkling capacity of the sprinkler. After the rain, when the road surface is water or wet, the amount of sprinkling or watering should be reduced. If there is too much dirt or sand on the road surface, it needs to be cleaned by environmental sanitation. After the road car or workers have been cleaned, sprinkle the water.
For users who purchased the sprinkler for the first time, they always like to think that the bigger the sprinkler is, the better the watering is. In fact, this idea is not correct. The greater the sprinkling volume of the sprinkler, the shorter the road surface distance from the sprinkling water will be, resulting in an increase in the number of watering of the sprinkler tanks and an increase in the relative fuel consumption of the round-trip car, which will reduce the economic benefits.
And if the sprinkler is oversprayed, it will easily cause some road area water with poor drainage capacity, which will result in the waste of water resources; in case of too much soil, the road surface will become quite muddy and give pedestrian vehicles. The inconvenience caused by the passage of traffic may even block the situation of the sewers; after the ground is dry, there will be a lot of dust and dust, which greatly increases the work intensity of the sanitation workers.
It can be seen from the above situation that spraying a large quantity of sprinklers may result in wastage, and there is no practical effect on the cleaning and cooling of the road surface. Therefore, the majority of driver friends should use scientific methods to formulate a reasonable The amount of water sprayed can not only achieve the purpose of spraying, but also can reasonably use water resources without causing waste.
Globe valve, also known as cut-off valve, is a mandatory sealing valve, so when the valve is closed, pressure must be applied to the valve disc to force the sealing surface not to leak. When the medium enters the valve from under the valve disc, the resistance that the operating force needs to overcome is the friction force between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the valve stem The diameter of the valve should be large, otherwise the failure of the top of the valve stem will occur. According to the connection method, it is divided into three types: flange connection, thread connection and welding connection. After the appearance of the self-sealing valve, the medium flow direction of the globe valve is changed from the top of the valve disc into the valve cavity. At this time, under the action of the medium pressure, the force to close the valve is small, but the force to open the valve is large, and the diameter of the valve stem can be adjusted accordingly. decrease. At the same time, under the action of the medium, this form of valve is also tighter. my country's valve "Three Chemicals" once stipulated that the flow direction of the globe valve should be from top to bottom. When the globe valve is opened, the opening height of the valve disc is 25% to 30% of the nominal diameter. The flow rate has reached the maximum, indicating that the valve has reached the fully open position. Therefore, the fully open position of the globe valve should be determined by the stroke of the valve disc.
Shut-Off Valve,Shutoff Valve,Automatic Shut Off Valve,Auto Shut Off Valve
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