Working principle of vacuum pump

To work the vacuum pump of the fecal suction truck, we must first understand its working principle. The more important thing in the working principle is the consideration of the source of power and stability. The power of the vacuum pump comes from the chassis engine. The engine is transmitted to the vacuum pump through the gearbox, power take-off and transmission shaft. During the suction operation, the vacuum pump draws the air in the sealed tank to form a negative pressure, and the atmospheric pressure outside the tank is used to press the dirt into the tank through the suction pipe. During the sewage discharge, the vacuum pump puts the atmospheric pressure outside the tank into the tank, and uses the air pressure to discharge the dirt out of the tank (the continuous working time of the vacuum pump generally does not exceed 30 minutes).

The flow sequence of the air flow in the air path is as follows: during suction, the vacuum pump sucks the air with a certain humidity in the tank into the water-gas separator, where the water is separated and flows back into the tank, and the gas enters the vacuum pump through the four-way valve along the pipeline Air inlet. Mixed with lubricating oil in the pump and discharged from the exhaust port through the compression chamber, especially the mixture is preliminarily separated by the strainer, and the separated oil flows back to the oil pump. The mixed gas is further separated by an oil and gas separator, and then enters a four-way valve to be discharged into the atmosphere. Manual operation of the four-way valve can change the direction of airflow, and the suction and discharge are free.

When the vacuum pump of the fecal suction truck is completed every time, it is necessary to formulate the corresponding inspection work of the fecal suction truck according to the different work intensity to ensure the working life of the fecal suction truck and the second working efficiency.


Mr. Zhu, Manager of the 1998 Factory Direct Sales Hotline

Company Profile

Xinxiang Lifeierte Filter Co., Ltd is specialized in manufacturing filter elements, filter housing, filter equipment, testing equipment and hydraulic parts.She is located in Xinxiang that is the center of filtration in China.Xinxiang Lifeierte Filter Co., Ltd integrates with oil filtration, water treatment and air purification to provide the society with more professional service and meet customers` demands. What`s more, Lifeierte has top-notch R&D team, professional technical team, effective production network and perfect after-sales service system. The corporate philosophy of Lifeierte is [to purify environment, to serve society, to manage faithfully,and to pursue excellence". The company also established the comprehensive cooperative relations with some famous design & research institutions and colleges. The quality of the product has reached the international advanced level and makes us achieve remarkable economic benefits.


Mainly including:

National standard filters and filter elements, replacement of abroad filters and filter elements, the hydraulic equipment like oil filter machines and filter series, the filter detective equipment;

Compressed air filters and filter elements, air cleaning filter drums and filter-bag series, various kinds of air cleaning facilities in different patterns;

Kinds of water treating equipment like stainless steel water filters and filter elements, full automatic backwashing filters.

We carry out ISO, DIN, IDF and 3A industry standard strictly during the manufacturing process and all the products can conform to the standards of GMP.

The endeavor makes us more professional. The performance and the effect of our replace products are comparable with imports; in addition the performance and the quality of domestically-made filters or filter elements are also stable and reliable. All those have been selected and recognized by customers and research institutions.

testing standards are satisfied by the products



ISO2941- filter elements- the testing for the cracking resistance

ISO2942- filter elements-the identifying for the structural integrity

ISO2943- filter elements-the identifying for the compatibility between material and the liquid

ISO3723- filter elements-the testing method for the end load of filter elements

ISO3724- filter elements-the identifying for the fatigue properties of the filter elements

ISO3968- filter elements-the testing for determination of pressure differential/flow characteristics

ISO4572- filter elements-the testing for the multi-pass method for evaluating filtration performance.

Hydraulic Filtration Service

Hydraulic Tank Filte,Hydraulic Return Filter,Hydraulic Fluid Filter,Hydraulic Return Line Filter

Xinxiang Lifeierte Filter Corp.,Ltd ,