A good partner for liquid nitrogen container rehydration – liquid nitrogen supply tank, you can call it a self-pressurized liquid nitrogen tank, or a low-pressure liquid nitrogen tank;
It has a working pressure of no more than 0.1MPa and a non-working pressure of 0MPa;
When working, that is, when replenishing and infusing other liquid nitrogen biological containers, pressurization is achieved by relying on the booster valve in the open state and the vent valve in the closed state. Non-working, that is, when it is stored statically, there is no need for pressurization, no booster valve, but a vent valve is required to avoid pressurization!
Answer: It is on!
The purpose of setting the vent valve is to vent the residual liquid after the liquid replenishment is completed, and release the residual pressure at the same time, so as to avoid the internal pipeline freezing and external heat entering the inner tank of the liquid nitrogen supply tank to vaporize the liquid nitrogen and increase the daily steam loss.
Opening the vent valve is equivalent to providing a vent hole for the low-pressure supply tank, releasing the naturally evaporated nitrogen inside, avoiding the increase in the pressure inside the tank, and also avoiding the entry of external moist air and the formation of frost or ice when it comes into contact with liquid nitrogen. clogged pipes.
Therefore, when the liquid nitrogen supply tank stores liquid nitrogen, the vent valve must be open, otherwise it is easy to trigger the safety valve, make a hissing exhaust sound, and cause the tank to explode!