To less than the output pressure of a positive pressure pump. Vacuum pump exhaust end, but also a positive but slightly positive pressure. Previous article has been specifically explained over so if you are more concerned about the Web site, how to adjust the pump pressure? * On this issue. So it is not difficult to answer this question, however, for its principles, that is, pump principle, since there is no specific discussion over the front, so we may not be very clear. So Now, on first look pump principle, and then explain some other aspects of the intellectual content of the pump. Pump Principle: The gas cylinder gas pressure regulating valve pump imported by an accumulator airway. Thus the gas cylinder pressure control. When the gas cylinder pressure regulator valve adjusted to reach a given pressure, pressure regulator valve to open the top talent enough to enter the airways, making the pump can empty load operation, and then be able to reduce power consumption, and pump protection. There are negative and positive pressure pump pumps the points, pump in. And it is not only between different, but related, then here's a simple analysis. Difference: while the positive pressure pump is the opposite. A negative pressure pump is external air is sucked into the suction mouth. The positive pressure pump is used to pump as the power required, two vacuum pump is mainly used in the vacuum required locations. And gas transfer, inflatable cheer, indirect pressure water and other locations. Vortex fan, whirlpool fan, vortex pump www.mingxintm.com