Address:H7/1-2, Qingyang Industrial Headquarter Base, No. 1 Chengfei Avenue, Qingyang District, Chengdu, Sichuan

Overseas Dept in Shenzhen:

Tel: 86-755-83234282


Skype: ellenhu.selectech


Address: E-605 Yuetong Building,MeiLong South Road, MinZhi,Longhua,ShenZhen , GuangDong,China,518131

AT:   home <<  Durable Variable Speed Vacuum Pump
¤ VAJ Series
  • Performance parameters
  • Diagram
  • Wiring instructions
  • Corresponding accessories
  • Operation video
  • Attentions


1.Our company has two brands to meet different requirement of clients,"Tianying" and "Cheehie".The "Tianying"
is economical product, while the "Cheehie "is high-grade products which with excellent performance in the service
life, electromagnetic interference suppresion, low noise (especially after prolonged use) etc. But VAJ series enjoy
a good reputation as brush motor pump in same industry.Small volume, low energy consumption

2.It can run continuously around the clock . Stable performance and high reliability. Maintenance-free . Damp gas as
the medium is acceptable. No pollution during the gas transmitted as it is oilless operation. Corrosive gas is allowed
to be input.The material for the parts which come in contact with gas : Glass fiber reinforced nylon ,EPDM rubber)It
can be mounted in any plane.such as horizontal plane, vertical plane, slope.








Electro  Magnetic  



●Technical Specifications




Operating Voltage

(V DC)

Load Current


Flow rate (L/min)

(negative pressure)
Continuous loading service life (hours)

Peak value

Effective value







>4200 hours







>3000 hours


Tips for service life test:

1.Test condition: The service life test results based on clean & non-corrosive laboratory,
the pumps run continuously around the clock with full load. If the operation condition is
better than that of our, service life will be greatly extended.
Laboratory conditions:
Ambient temperature: 5℃-33℃, fluctuates according to the climate
Relative humidity: 50%-85%, fluctuates according to the climate
2.Instructions for Loading Test:When the inlet completely been blocked, gas outlet through
to the atmosphere without any connection.
3.Because the test is undergoing checking, the data may be updated in future without any notice.


1.The inlet of this pump can run in heavy duty,even completely blocked, both are proper functioning.

2.The outlet of this pump should remain unobstructed. If not ,as the result of the blockage, the high-pressure
will be caused and threat to safety. If you need large damping components for the outlet, please select the FML
or FNY、FKY、FCY serials.

3.Electromagnetic interference : If the system is equipped with a precision circuit or precision circuit around
the pump ,these brush-motor pumps may cause the electromagnetic interference problems, so the products with
brushless motor are highly recommended.

4.All the products use DC power. The battery with corresponding voltage can be used for the power supply. The
port near red dot shall be connected to the positive pole, and the other shall be connected to the negative pole.
Please specify the working voltage when ordering.

5.Weight: approximately 80 g.

6.Customization is available.

7.All parameters presented in this instruction are based on the standard atmospheric pressure at 25℃, unless
otherwise defined. The free flow is referred to as the flow.



●User Instructions

1.Service Conditions
The pump shall not be exposed to direct sun light.It shall work in clean and non-corrosive environment.
Ambient temperature:0-50 ℃ (No condensation)
Relative humidity: ≤ 90 %

2.Working medium
Damp gas is allowed,but with solid particles are not acceptable.Temperature range allowed for gas suction:0~50℃
The materials and names for the parts which come in contact with gas as below:

Part name

Part material


Pump body

SPS(Syndiotactic polystyrene resin)

All material has certain ability of corrosion resistance,
please evaluate the tolerance of the parts which come in contact with gas pumped.


EPDM Rubber



VAJ Series Micro Vacuum Pump Dimensional Drawings


Drawing unit: mm


 Optional Accessories

Filter Silicone tube(Note: inner diameter is about 3mm, and outer diameter is about 5mm.)

Note: A small size filter and a 10cm silicone tube will be included in the package for each



     1.No foreign matter should keeping in the nozzle, or the micro pump may be damaged.

     2.The product has not explosive-proof performance. No using in inflammable and explosive environment.

     3.When the gas input is hazardous, users must re-seal the pump for the sake of safety!

     4.All gas circuit elements such as pipeline and gas tank must be provided with enough strength for the sake of safety.

Chengdu Qihai Electromechanical Equipment Manufacturing Co., Ltd
成都气海机电制造有限公司 蜀ICP备12008449 成公网备字[200600057]号