JZJLG Roots series screw dry vacuum pump unit is consists of ZJ type roots pump as the main pump, LG series screw vacuum pump as a fore pump is composed of dry without oil vacuum unit. JZJLG Roots series screw dry vacuum pump unit than single screw vacuum pump is more suitable to work under low pressure, such as a vacuum distillation process to pumping rate 150L / s, work pressure is 2000Pa, choose JZJLG150-2 vacuum unit (10.5kw), than the selection of single LG180 screw vacuum pump (22KW) more energy-saving and the unit can reach the lower limit pressure.

As the main pump and the former pump are used to dry pump JZJLG, so Roots series vacuum screw dry pump vacuum unit with the following main features:

l The pump cavity has no oil, no pollution of the pumping system, can achieve clean vacuum.

l The pump cavity has no oil, very easy to achieve solvent recovery.

l Roots pump cavity all the nickel plating layer processing, screw pump cavity of the nickel plating and PTFE processing, smoke removing water vapor, solvent gas and other corrosive medium.

l Because no oil in the work process, wastewater discharge, no pollution to the environment.

l The requirements for cooling water pump for low cooling circulating water can meet the requirements of the ordinary, and the cooling water is small.

The primary pump adopts the company self-developed ZJ Roots series vacuum pump, our company will pump cavity and the bearing cavity sealing was improved after the ZJ Roots series vacuum pump in the pumping process of a large number of water vapor and various solvents oil pump is not easy to be emulsified.

Pre stage pump adopts the company self-developed LG series screw vacuum pump, stable and reliable operation, because between the pump chamber and a gear chamber adopts mechanical seal, LG series screw vacuum pump in not filled with nitrogen protection can still stable.

Model representation method

Example：J Z J L G 1 5 0 － 2

J-denotes the first letter of the unit.
ZJ-denotes the main pump is ZJ series Roots series vacuum pump
LG- denotes the fore pump LG series screw pump vacuum
150–denotes main pump (Roots pump) pumping speed L/s
2 - denotes pumping speed ratio code (that is, pumping speed ratio of the main pump and the former pump is 2)

Screw pumps JZJLG series unit specification:

Unit type	pump type		suction speed (L/s)	Max. suction pressure (Pa)	Limited vacuum (Pa) abs	Total power (kW)
Unit type	main pump	fore pump	suction speed (L/s)	Max. suction pressure (Pa)	Limited vacuum (Pa) abs	Total power (kW)
JZJLG70-2	ZJ70	LG30	70	6000	1Pa	5.5
JZJLG150-4	ZJ150	LG30	150	2000		7
JZJLG150-2	ZJ150	LG70	150	6000		10.5
JZJLG300-4	ZJ300	LG70	300	1500		11.5
JZJLG300-2A	ZJ300	LG100	300	2000		19
JZJLG300-2B	ZJ300	LG180	300	4000		26
JZJLG600-4A	ZJ600	LG100	600	1000		22.5
JZJLG600-4B	ZJ600	LG180	600	1500		29.5
JZJLG1200-8	ZJ1200	LG180	1200	400		37

Explanation:

1. The above table is recommended standard series, due to the different work conditions in actual production application, inhalation of gas and pressure will change a lot, so in the selection should be according to the actual pumping process, gas release process, condensable gas condensation, suction pressure change, check calculation or with reference to the existing equipment selection.
2.Single pump technical indicators refer to the pump parameters table.
3.Maximum suction pressure is the main pump can start the maximum pressure, such as a long time higher than the pressure to run, will cause the main pump overload.
4.Please specify the technical requirements of the gas extraction medium, working pressure, and the explosion proof and other technical requirements.

Application Site of LG Series Vacuum Screw Pump

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