Molecular pump is a vacuum pump that transfer momentum to the gas molecules by high-speed rotation of the rotor to get directional speed, gas molecules will be compressed and was driven to the exhaust port. The molecular pumps are distinguished according to rotor structural characteristics as bel...

It often appear big noise and impeller cavitation problems during water ring vacuum pump running. Usually the reason is vacuum pump inlet pressure is too low, then resulting in rupture of the bubble. It can lead to vacuum pump’s rotor rupture and scrap when this situation become serious. When the...

The liquid ring vacuum pump and liquid ring compressor share same working principle, but their basic form and structure differs. The difference can be difined as following five aspects: 1. different circumferential velocity range of its mpeller The impeller circumferential velocity is mainly dete...

Vacuum system can be divided into low pressure vacuum system, high pressure vacuum system and ultra-high vacuum system according to the vacuum degree. Based on the properties of structural materials, it can be divided into glass system and metal system. According to the flow of gas in the system ...

Liquid ring vacuum pump can achieve 33mbar only, when the working vacuum is near to its ultimate vacuum, there will be cavitation. Simultaneously,liquid ring vacuum pump’s suction capacity decreased. To solve this problem, user can add an air ejector on liquid ring vacuum pump’s sucti...

Both EVP ZJ and ZJP belongs to roots pump. They are same in pumping principal, working curve and application. Pumping principal:effect through two”8”?shaped rotors in opposite direction to reach suction and exhaust. Schematic diagram as below: Feature of roots pump: The roots pump has to be work...

If the ultimate vacuum of the diffusion pump become bad or need to change the oil, the diffusion pump must be disassembled, cleaned and restarted assembly. 1, The disassembly of the diffusion pump (1), From top to bottom to disassemble the pump core. (2), Please keep cautious during the decomposi...

Generally speaking, we are required to calculate the required time from initial pressure to required pressure.So we should calculate it according to initial pressure, required pressure, volume of vacuum chamber.conversely,we could also select suitable pump according to initial pressure, required ...

Many users always confused about when to adopt by pass pipeline for their system. To understand whether by pass pipeline is necessary, we should firstly understand its function, below sketch can be good explanation: Generally, the evacuating time is main factor to decide whether to use by pass p...

Piston vacuum pump principle are similar to rotary vane vacuum pump but the structure is different. Piston vacuum pump use slide valve mechanism to change the suction chamber volume, so it is also called slide valve pump. Although it is an old pump, compare to the rotary vane pump, it is high wor...