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Muffler performance evaluation
The performance of the muffler can be evaluated from the following three aspects: (I) Muffler performance, namely the muffler volume and spectrum characteristics. The amount of muffler muffler is usually expressed in terms of acoustic loss and insertion loss. In the field test, it can also be exp ....
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Globe valve three categories and selection skills
There are several commonly used globe valves: 1) DC globe valve: In the DC or Y-type globe valve, the flow path of the valve body is inclined with the main flow path, so that the damage of the flow state is smaller than that of the conventional globe valve , So the pressure loss through the meter va ....
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·Zunyi, Guizhou Province, April 1
Since April 1st, the Zunyi Central City will classify and implement motor vehicle exhaust pollution restriction measures in phases. The first batch of restricted vehicles: heavy-duty and medium-sized trucks It is reported that the first batch of restricted vehicles is heavy-duty and medium-duty tr ....
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Refined oil prices may rise on April 11
On March 27, 2013, the price of oil dropped for the first time in the year. According to the new pricing mechanism, oil prices may usher in another adjustment on April 11. The reporter learned that due to changes in the oil sustenance of the new mechanism, it is difficult for the industry to ....