Two-stage vacuum pump

In the last article, the structure and working principle of single stage vacuum pump were described. Next, we would like to introduce our two-stage vacuum pump. Our company’s best-selling double-stage vacuum pump mainly has two types: double-stage water ring vacuum pump and double-stage rotary vane vacuum pump.

2SK series two-stage water ring vacuum pump

2SK series two-stage water ring vacuum pump is equivalent to two SK series water ring vacuum pumps in series.
Because SK series water ring vacuum pump can only reach the limit vacuum of -700mmhg, in order to achieve a higher vacuum and a higher pumping rate under high vacuum, in the 1980s, domestic development of 2SK series vacuum pump.

2SK series water ring vacuum pump overview

The 2SK series two-stage water ring vacuum pump and the 2sk-p1 series two-stage water ring vacuum pump and air jet pump units are used to extract air and other non-corrosive, water-insoluble, non-solids gases in order to obtain a higher vacuum in an airtight container.

It is widely used in food, weaving chemical industry, medicine and metallurgy industry and electronic fields of vacuum evaporation, vacuum concentration, vacuum moisture, vacuum impregnation, vacuum drying and vacuum smelting. It is characterized by high vacuum, high pumping speed in high vacuum area, compact structure, reliable operation and convenient maintenance.

2SK series are suitable for operating conditions with suction pressure lower than 0.08mpa. 2sk-p1 series are suitable for working conditions with suction pressure lower than -0.096mpa. When equipped with large air pump, the ultimate vacuum degree can reach -750mmhg.

The operating vacuum range is 0.03-0.08mpa.

Product display

Two-stage vacuum pump

Technical specifications

Model Suction capacity Ultimate vacuum Power speed Water supply Inlet/outlet diam Water inlet
m³/min MPa(G) KW r/min L/min DN(mm) (mm)
2SK1.5 1.35 -0.097 4 1440 10-15 40 G1/2”
2SK-3 2.7 -0.098 7.5/11 1440 15-20 40 G1/2”
2SK-6 5.4 -0.098 15 1460 25-35 65 G1/2”
2SK-12 10.8 -0.098 22/30 970 40-50 100 G1/2”
2SK-20 18 -0.098 45 740 60-80 125 G3/4”
2SK-30 27 -0.098 55/75 740 70-90 125 G3/4”

Installation dimensions

2SK series two-stage water ring vacuum pump installation dimensions


Model 2X-A double stage rotary vane vacuum pump

2x-a type two-stage rotary vane vacuum pump features:

1. Working requirements: when the inlet pressure is greater than 6500Pa, the continuous working time shall not exceed 3 minutes to avoid pump damage caused by oil injection.
2. Working requirements: the inlet pressure is less than 1330Pa, allowing continuous working for a long period.
3, environmental temperature, vacuum pump generally in 5 ℃ and 40 ℃ at room temperature and is not higher than 90% relative humidity environment in use.
4. Type of gas: clean and dry air without other mixtures at room temperature. No other dust or moisture is allowed.
5. Equipped with air ballast valve, which can remove a small amount of water vapor and extend the service time of oil pump (except for 2X-4A);
6, neon lamp manufacturing special vacuum pump, single crystal furnace, polycrystal furnace, laminator supporting vacuum operations.
7, can be used alone for the middle vacuum pump, can also cooperate with other high vacuum pump group for the pre-pump.
8, more than one pump tap operation, improve efficiency, can save energy.

Product display

2x-a type two-stage rotary vane vacuum pump

Scope of application


2x-a type two-stage rotary vane vacuum pump scope of application

Technical specifications

2X-4A 2X-8A 2X-15A 2X-30A 2X-70A 2X-100A
Pumping speed(L/s) 4 8 15 30 70 100
Ultimate pressure(Pa) Partial pressure 6×10ˉ²(5×10-4Torr)
Total pressure 2.66(2×10-2 Torr)
Rotary speed(r/min) 450 320 320 450 420 360
Motor power(Kw) 0.55 1.1 2.2 3 5.5 7.5
Working voltage(v) 380 380 380 380 380 380
Cooling Mode Natural cooling Water cooling
InletDiam(mm) I.D. 25 40 50 65 80 80
O.D. 30 50 80 85 100 125
Dimensions(mm) Length 540 790 790 810 910 1130
Width 335 430 530 480 650 740
Height 380 540 540 560 700 690
Oil capacity(L) 1.0 2.0 2.8 3.0 4.2 5
Recommend solenoid valve DDC-JQ25 DDC-JQ40 DDC-JQ40 DDC-JQ65 DDC-JQ80
Noise (dB A) 65 70 70 70 75 90
Weight(kg) 60 158 202 230 480 560

Installation dimensions

2x-a type two-stage rotary vane vacuum pump installation dimensions


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