Chemical Pump Encyclopedia

QEEHUA PUMP: Bag Filter Housing Material Selection

Chemical filter

Bag filter is a common filtration equipment widely used in chemical, food and beverage, pharmaceutical, electric power and other industries. It intercepts impurities in the liquid through the filter bag to achieve high efficiency filtration. Filter bags are becoming increasingly popular in the market due to their suitability for a wide range of applications and ease of replacement. In order to ensure optimal bag filtration performance, it is important to choose the right bag filter housing material for use.

Working Principle of Bag Filters

The liquid to be filtered enters the filter bag from the top or side and is supported by a basket that withstands the mechanical load. As the liquid passes through the filter bag, contaminants are trapped, and the purified liquid is discharged from the bottom outlet. During the filtration process, the upstream pressure gradually increases until the filter bag becomes completely blocked. At this point, the filter bag needs to be manually replaced or switched to another filter through a valve.

Advantages of Bag Filters

The use of bag filters has the following advantages:

  • Good sealing performance: The structure is designed to have strong circulation capability and is easy to clean.
  • High filtration efficiency: It minimizes the possibility of leakage and is resistant to corrosion and high temperatures.
  • Large dirt-holding capacity: It is suitable for handling high-viscosity liquids and large volume flows.

Types of Filter Bags for Bag Filters

Based on the number of filter bags, bag filter housings can be divided into two types:

  1. Single-bag filter: As the name suggests, it can accommodate only one filter bag. Suitable for small flow and low precision filtration.
  2. Multi-bag filter: It can accommodate multiple filter bags, providing higher filtration efficiency and larger dirt-holding capacity. It is suitable for high-flow and high-precision filtration applications.

Bag Filter Housing Materials

Bag filter housings are primarily made of two materials: stainless steel and plastic.

  1. Stainless steel bag filter housing: it has the advantages of corrosion resistance, high temperature resistance, high compressive strength, etc. It is suitable for harsh working conditions, such as chemical, petroleum, natural gas and other industries.
  2. Plastic bag filter housing: with the advantages of light weight, low cost, easy processing, etc., applicable to water treatment, food and beverage industries.

Applications of Different Materials for Bag Filter Housings

Bag filters are widely used in various industries. Both stainless steel and plastic housings perform well in suitable applications.

  • Stainless steel bag filter housing: Widely used in industries such as food and beverage, paints, coolants, water treatment, chemical, pharmaceutical, and automotive.
  • Plastic bag filter housing: Suitable for applications such as reverse osmosis systems, petroleum and natural gas, seawater desalination, petrochemicals, food and beverage, and pre-filtration of chemicals.

Find a Bag Filter

How to Choose the Right Bag Filter

The following factors need to be considered for selecting a suitable bag filter:

  • Working conditions: select the suitable material and structure according to the medium, temperature, pressure and other factors of the filtered liquid.
  • Flow rate requirements: select the appropriate size and number of filter bags according to the filtration flow rate.
  • Chemical compatibility: the filter bag material needs to be compatible with the viscosity, corrosiveness and chemical composition of the filtered liquid.
  • Cost and service life: Stainless steel housings are durable but have a high initial investment, while plastic housings are an economical alternative.

Bag Filters by QEEHUA PUMP

QEEHUA PUMP is a professional manufacturer of chemical pumps and filters with years of industry experience and strong technical capabilities. The company offers a wide range of bag filter housing options, available in stainless steel or plastic, to meet diverse customer needs.

QEEHUA PUMP’s bag filters have the following features:

  • High quality: Manufactured using premium materials for durability.
  • High efficiency: Provides high filtration accuracy and strong dirt-holding capacity.
  • Easy operation: Compact structure for convenient installation and maintenance.
  • Safety and reliability: Rigorously tested and compliant with national standards.

Find a Bag Filter?

QEEHUA PUMP is committed to providing customers with high-quality bag filter housings and comprehensive pre-sales and after-sales services. If you have any requirements, feel free to contact us for further assistance.


Bag filters are increasingly being used in various industries. Selecting the right type and material for the filter housing is crucial to ensure filtration efficiency and cost-effectiveness. As a leading and reliable manufacturer of chemical pumps and filters, QEEHUA PUMP offers a variety of bag filter housing options to meet the diverse needs of customers. If you have any questions regarding the selection of bag filter housings, please don’t hesitate to contact our professional team.

Related Posts