Filter selection and Application

Principle requirements for filter selection

The filter is a small equipment to remove a small amount of solid particles in the liquid, which can protect the normal operation of the equipment. When the fluid enters the filter cartridge with a certain size of filter screen, its impurities are blocked, and the clean filtrate is discharged from the filter outlet. When it needs to be cleaned, as long as the removable filter cartridge is taken out, it can be re loaded after treatment.

1. Inlet and outlet diameter of filter:

In principle, the inlet and outlet diameter of the filter shall not be less than the inlet diameter of the matched pump, generally consistent with the inlet pipe diameter.

2. Nominal pressure selection:

Determine the pressure level of the filter according to the highest possible pressure in the filter line.

3. Selection of hole number:

The selection of filter hole number mainly considers the impurity particle size to be intercepted, which is determined according to the technological requirements of medium process. Refer to the following table “screen specifications” for the interceptable particle size of various specifications of screen.

4. Filter material:

The material of the filter is generally the same as that of the connected process pipe. For different service conditions, the filter made of cast iron, carbon steel, low alloy steel or stainless steel can be selected.

5. Calculation of filter resistance loss

The pressure loss of water filter is 0.52-1.2kpa under the general calculation of rated flow rate.

 

Filter application

1. Stainless steel filter

Stainless steel filter is widely used in the pipeline of steam, air, water, oil and other media; it protects all kinds of equipment, pumps, valves, etc. of the pipeline system; it is free from the blockage and damage caused by rust, welding slag and other impurities in the pipeline. Stainless steel filter has the advantages of strong anti pollution, convenient blowdown, large circulation area, small pressure loss, simple structure, small volume and light weight. The filter screen is made of stainless steel with strong corrosion resistance and long service life.

2. Y filter

Y-type filter is an indispensable filtering device in the pipeline system of media transmission. Y-type filter is usually installed at the inlet end of pressure reducing valve, pressure relief valve, constant water level valve or other equipment to remove impurities in the media, so as to protect the normal use of valves and equipment. Y-type filter has the advantages of advanced structure, small resistance and convenient blowdown.

3. Y type pull rod expansion filter

The Y-type pull rod expansion filter adopts a new design, which combines the Y-type filter and expansion joint. It is simple in structure and convenient in use. It solves the defect of inconvenient installation on the fixed pipeline caused by the different length between the flanges of various standard products. The pull rod expansion filter is mainly used in the water supply and drainage piping of high-rise buildings, multi-storey buildings or factories, and is usually installed in the pressure reducing valve and pressure relief valve The inlet end of valve, constant water level valve or other main equipment is installed with pull rod expansion filter, which is convenient for removing pipe sundries or installation and disassembly to ensure the normal use of valve or equipment.

4. Basket filter

The basket filter can protect the compressor, pump and other equipment and instruments from normal operation by removing the small equipment with a small amount of solid in the liquid; it is also a small equipment to improve the product purity and purify the gas. Therefore, basket filter is widely used in petroleum, chemical industry, chemical fiber, medicine, food and other industries. Basket filter is composed of shell, drain cover, filter element, filter screen, bolt, etc.

5. T filter

T-type filter is widely used in the pipeline of steam, air, water, oil and other media to protect all kinds of equipment on the pipeline system, such as pumps, valves, etc., from rust, welding slag and other sundries in the pipeline to block and damage the pipeline. The T-type filter produced by Shanghai rimei Valve Manufacturing Co., Ltd. has the characteristics of strong anti pollution performance, convenient blowdown, large circulation area, small pressure loss, simple structure, small volume, etc.; the filter screen materials of T-type filter are all stainless steel, strong corrosion resistance, long service life; the T-type filter is also divided into direct current type and baffle type, the density of the filter screen is 10 mesh-120 mesh, and the temperature is 0 ~ 450 ℃ , which can be selected according to the needs of users.


Post time: Feb-27-2020


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