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In the process of using the four-ring freeze-drying experimental freeze-drying machine
Time of Update: 2022-08-19
If the dry items are changed to be light in weight and small in size (in the form of small particles) after drying, a barrier net should be added to the vacuum port in the working room to prevent the dry matter from being sucked and damaging the vacuum pump (or solenoid valve) .
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Atmospheric microplastics have an impact on the climate, environmental monitoring instruments are dispatched
Time of Update: 2021-11-01
Environmental monitoring instruments and an exhaust gas mainly comprising air detector , a source of pollution and environmental water quality monitoring equipment, emergency on-site monitoring instruments, electromagnetic radiation and radioactive monitoring equipment four categories, each type monitors environmental factors on the quality of the corresponding The division of labor is different, and the purpose is the same .
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Product performance and production principle of urethane
Time of Update: 2021-08-14
2. Production principleAfter salting with urea and nitric acid , it is alcoholyzed with ethanol, sodium nitrite and sulfuric acid to obtain carbamate .
6. Production processIn the reaction pot, add absolute ethanol and urea, and add nitric acid dropwise at 40°C to obtain a urea nitrate solution .
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Six basic structures of centrifugal pump
Time of Update: 2019-06-13
The basic structure of centrifugal pump is composed of six parts: impeller, pump body, pump shaft, bearing, sealing ring and stuffing box 1 The impeller is the core part of the centrifugal pump It has
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Design features of vacuum packaging machine
Time of Update: 2013-06-08
Vacuum packaging machine is a kind of multi station continuous production equipment with conveyor belt It is easy to operate, simple to maintain, widely used and cheap Its characteristics are describe
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On the structure of disc filter
Time of Update: 2013-05-31
You should know that in fact, disc filter is indispensable in the transmission of media pipeline When we install the pressure relief valve and pressure relief valve, it is often used to eliminate the
