When the soil contains too much harmful substances and exceeds the self-purification ability of the soil, it will cause changes in the composition, structure and function of the soil, microbial activities are inhibited, and harmful substances or their decomposition products accumulate in the soil, affecting the green plants. Growth and development, which is called soil pollution.
On the other hand, there are road construction waste dumping, long-term plant rotation, unreasonable fertilization and pesticide fight, domestic sewage and garbage pollution and other factors cause soil compaction, soil fertility is continuously reduced, and soil quality is degraded to some extent.
Therefore, in the above situation, the soil needs to be improved.
Nowadays, landscaping workers generally apply soil amendments to improve soil physical and chemical properties and meet the quality standards of urban greening soil. The soil amendment can make the soil achieve a dynamic balance through self-biological adjustment, promote microbial growth and activate the regenerative elements in the soil, improve the soil aggregate structure, adjust the soil pH value, and normalize the soil growth crop conditions in the saline-alkali soil and the plated land. And to maintain the moisture and air in the soil, in order to achieve the purpose of "purifying the soil" and improve the yield and quality of the plant in the soil.
In general, the improved soil pH tends to be appropriate, the soil aggregate structure is better, the soil enzyme activity is enhanced, and the soil nutrient utilization rate is increased, which significantly reduces the amount of chemical fertilizer applied (generally can be reduced by more than 30%). At the same time, the soil beneficial microorganisms are improved and their reproduction is increased, thereby inhibiting the action of harmful pathogenic bacteria (such as various fungi, bacteria, etc.). For example, antibiotics produced by the anti-bacteria can significantly reduce the activity of pathogenic bacteria, thereby inhibiting and killing pathogenic bacteria in the soil.
Valves are found in virtually every industrial process, including water and sewage processing, mining, power generation, processing of oil, gas and petroleum, food manufacturing, chemical and plastic manufacturing and many other fields.
People in developed nations use valves in their daily lives, including plumbing valves, such as taps for tap water, gas control valves on cookers, small valves fitted to washing machines and dishwashers, safety devices fitted to hot water systems, and poppet valves in car engines.
In nature there are valves, for example one-way valves in veins controlling the blood circulation, and heart valves controlling the flow of blood in the chambers of the heart and maintaining the correct pumping action.
Valves may be operated manually, either by a handle, lever, pedal or wheel. Valves may also be automatic, driven by changes in pressure, temperature, or flow. These changes may act upon a diaphragm or a piston which in turn activates the valve, examples of this type of valve found commonly are safety valves fitted to hot water systems or boilers.
More complex control systems using valves requiring automatic control based on an external input (i.e., regulating flow through a pipe to a changing set point) require an actuator. An actuator will stroke the valve depending on its input and set-up, allowing the valve to be positioned accurately, and allowing control over a variety of requirements.
Stop Valves, Ball Cock, Angle Valves, Gate Valves, Check Valves
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