As each water ring vacuum pump manufacturer's products are different, so the parameters are also different. But their pressure is determined by the structure and quality. Users can judge the limit pressure of water ring vacuum pump according to the following two points:
1. Limit relative pressure: the relative pressure is how much lower the measured internal pressure is than "atmospheric pressure". Because the air inside the container is pumped, the pressure inside the container is always lower than that outside the container. Therefore, when expressed in terms of relative pressure or gauge pressure, the value must be preceded by a negative sign, indicating that the internal pressure of the container is lower than the external pressure.
2. Ultimate absolute pressure: absolute pressure is the pressure higher than the theoretical vacuum. It compares the absolute vacuum pressure of the theoretical state. Due to the limitation of technology, we can't pump the internal pressure to the absolute vacuum value of 0Pa in any case. Therefore, the vacuum value pumped by the water ring vacuum pump is higher than the theoretical vacuum value.
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