"Negative pressure pump" and "positive pressure pump" are mainly artificially distinguished based on their function and main purpose. Negative pressure pumps are mainly used in situations that require vacuum (negative pressure), such as pumping, gas analysis, gas circulation, gas sampling, vacuum adsorption, indirect water absorption, etc; Positive pressure pumps are mainly used as power sources for gas transfer, pressurization of sealed containers, inflation, and indirect water pressure. They are commonly used in medical, scientific research, environmental protection, instrumentation, control, and other fields.

The exhaust end of a negative pressure pump also has positive pressure, only slightly positive pressure, which is much lower than the output pressure of a positive pressure pump. For example, micro vacuum pumps such as VM, VAA, PC series are called negative pressure pumps or suction pumps, and their exhaust end pressure is often only a few kilopascals (KPa); The suction end of a positive pressure pump also has a slight negative pressure to complete the suction function.

The gas booster pump series is a two-stage booster pump, which can increase the pressure of extremely low pressure gas to a very high pressure. The driving pressure is ≤ 7bar, and the pressure range of the gas input port is 0.5-10bar, with a maximum increase of 90Mpa. The reversing method of this series of pumps is completely the same as that of the N series, and the entire pump is made of aluminum alloy and stainless steel. In the gas drive part of the pump, lubricating gas is required for the sealing and other internal parts to be lubricated. The driving piston diameter of this series of pumps is 160mm. The gas booster pump series is a single-stage booster pump, and a certain degree of pre pressure is required to achieve the required pressure. The pre pressure increase varies depending on the maximum pressure shown in the gas booster pump image. The maximum pressure can be increased to 80Mpa.

The H series gas booster pump adopts a single gas controlled non-equilibrium gas distribution valve to achieve reciprocating motion of the pump, all made of aluminum alloy and stainless steel. All seals are imported high-quality products, with a maximum designed driving air pressure of 10 bar. To ensure the pump's lifespan, it is recommended to have a driving air pressure of less than 8 bar. The driving piston diameter of this series of pumps is 160mm, and it is a single acting pump. All single acting pumps are equipped with exhaust cooling. The reversing method of this series of pumps is completely the same as that of the B series, with a flow rate twice that of the B type