Selection and application of strainer

Strainer is an indispensable device in the medium pipeline. It is usually installed at the inlet of pressure reducing valve, pressure relief valve, constant water level valve, square strainer and other equipment. The strainer is composed of cylinder, stainless steel strainer screen, blowdown part, transmission device and electrical control part. After the water to be treated passes through the strainer cartridge of the strainer screen, its impurities are blocked. When it needs to be cleaned, as long as the detachable strainer cartridge is taken out and re loaded after treatment, it is very convenient to use and maintain.

Selection principle and requirement of strainer

The strainer 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 strainer cartridge with a certain size strainer screen, its impurities are blocked, and the clean filtrate is discharged from the outlet of the strainer. When cleaning is needed, just take out the detachable strainer cartridge and reload it after treatment.

1. Inlet and outlet diameter of strainer:

In principle, the inlet and outlet diameter of the strainer should not be less than the inlet diameter of the matching pump, which is generally consistent with the inlet pipe diameter.

2. Nominal pressure selection:

The pressure level of the strainer is determined according to the highest possible pressure in the strainer pipeline.

3. Selection of hole number:

The selection of the number of strainer holes mainly considers the particle size of impurities to be intercepted, which is determined according to the process requirements of medium flow. For the interceptable particle size of various specifications of screen, please refer to the table "screen specifications".

4. Strainer material:

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

5. Calculation of strainer resistance loss

The pressure loss of water strainer is 0.52-1.2kpa at the rated flow rate.

Application of strainer

1. Stainless steel strainer

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

2. Y-type strainer

Y-type strainer is an indispensable strainering device in the pipeline system of conveying medium. Y-type strainer 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 medium and protect the normal use of valve and equipment. The Y-type strainer has the advantages of advanced structure, small resistance and convenient discharge.

3. Y-type pull rod telescopic strainer

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

4. Basket strainer

Basket type strainer can remove small equipment with a small amount of solids in liquid, which can protect compressor, pump and other equipment and instruments; It is also a small equipment to improve product purity and purify gas. Therefore, basket strainer is widely used in petroleum, chemical, chemical fiber, medicine, food and other industries. Basket strainer is composed of shell, drain cover, strainer element, strainer screen, bolt, etc.

5. T-type strainer

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

Source: China Strainers Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)

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