When the internal pressure of the gas ballast valve is lower than the external pressure, the gas ballast valve opens and the pressure of the compressed gas has reached the discharge pressure before the gas enters the pump chamber to make the partial condensable gas pressure in the pump chamber reach the saturated vapor pressure at the pump temperature , The condensable gas will be discharged; when the internal pressure of the gas ballast valve is higher than the external pressure, the gas ballast valve is closed and the other function of the gas ballast valve is to restore the ultimate pressure of the vacuum pump. Sometimes we use it to extract the general air, containing fewer condensable gases, the general gas ballast valve is closed, but as time goes by, the oil is gradually being contaminated with a small amount of condensable gas contained in the air , For the vacuum pump without gas-bearing mechanism, it can only replace the new oil, or pump the oil to evaporate the liquefied steam to restore the pump's original limit pressure, but for the vacuum pump with gas-operated valve , Just open 1 to 2 hours to restore the vacuum pump ultimate pressure.
Microscope Slides And Cover Slips
1. The glass slide is used to put the sample to be tested, and the cover glass is covered on the sample to be tested.
2. The glass slide is at the bottom, which is the carrier for the material you want to observe, that is, you want to put something on it.
3. The cover glass is smaller than the slide glass. The glass slide is mainly used to hold the observation objects. The cover glass is covered on the slide glass and used for fixing.
4. The glass slide is a thicker piece of glass in the transfer slide, which is used to carry the real object. The cover fragment is the small round or square thin one.
5. Mounting is a general term for a set of things, including slides, coverslips and loaded objects
6. The cover glass is square, the slide glass is rectangular, and the width is longer than the side of the cover glass.
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