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 <<  Variable Speed Vacuum Liquid Pump
¤ WAJ Series
  • Performance parameters
  • Diagram
  • Wiring instructions
  • Corresponding accessories
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  • 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 WAJseries enjoy a good reputation as brush motor pump
in same industry.

2,This kind of pump has dual function that can be used for liquid or gas sampling.It is a self-primin
g pump. (When turned on ,the pump starts to do the liquid sampling, no extra water is needed at the beginning.)
It also allows dry running.(When the liquid runs out or without liquid ,the pump can run smoothly without any damage)

3.Small volume, low energy consumption.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. It can be mounted in any plane.such as horizontal plane, vertical
plane, slope.Corrosive gas is allowed to be input.The material for the parts which come in contact with gas
(or liquid) : SPS(Syndiotactic polystyrene resin) ,EPDM(rubber)








Electro  Magnetic  



●Technical Specifications


As the vacuum pump

As the liquid pump

Continuous loading service life

Operating Voltage
Load Current
Flow rate
(effective value)
(negative pressure)
Flow rate
(effective value)


















Remark : customized is available


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:
Make the service life test separately with two kinds of loaded, take the minimum value. Test 1 ,
input the liquid continually ; Test 2 ,completely block the inlet, gas outlet through to the atmosphere
without any connection and continually do the gas suction.

3.Because the test is undergoing checking, the data may be updated in future without any notice.



1.To be used as vacuum pump,the inlet of this pump can run in heavy-duty ,and blocked for a while,
the pump can work properly, but the outlet of pump should remain unobstructed.

2.To be used as liquid pump,both inlet and outlet should remain unobstructed. Otherwise, please select
other series, such as WPY、WKY、WNY.

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.Customization is available.

5.Weight: approximately 60 g.

6.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:

Economical version: 0-50 ℃ (No condensation)
Relative humidity: ≤ 90 %

2.Working medium

Gas or liquid is allowed, but with solid particles are not acceptable. The materials and names for the parts
which come in contact with gas (or liquid) 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


Temperature range allowed for gas(or liquid) suction:0~50℃


WAJ Series Micro Vacuum &Liquid 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 medium size filter and a 10cm silicone tube will be included in the package for each



     1.No foreign matter should keeping in the nozzle,the outlet of this pump should remain unobstructed,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(or liquid) input is hazardous,users must re-seal the pump for the sake of safety!

     4.All gas circuit elements such as 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