KSB BOA-S Flange Y-type Filter 

The BOA-S is a flanged Y-type filter from the German KSB Group, specifically designed for filtering impurities in industrial piping systems. This product conforms to DIN/EN standards, uses a flange connection, and is suitable for hot water heating, air conditioning systems, process engineering, and chemical industries.

As the "gatekeeper" of pipeline systems, BOA-S filters are typically installed upstream of critical equipment such as pressure reducing valves, pressure relief valves, level control valves, and pump sets. They intercept solid particles, welding slag, rust, and other impurities in the medium, preventing them from entering precision equipment and causing wear, blockage, or damage, thus effectively extending the service life of downstream equipment.

KSB BOA-S Flange Y-type Filter Model Description

The BOA-S series filters adopt the KSB standard naming convention. The following are typical model interpretations:

Model Example | Description

BOA-S DN50 PN16 | Nominal diameter 50mm, pressure rating PN16

BOA-S DN100 PN25 | Nominal diameter 100mm, pressure rating PN25

BOA-S DN200 PN16 | Nominal diameter 200mm, pressure rating PN16

Optional diameter range: DN 15 – DN 400

Pressure rating options: PN 6 / PN 16 / PN 25

KSB BOA-S Flange Y-type Filter Core Technical Parameters

Parameter Item | Specification Range

Nominal Diameter | DN 15 – DN 400

Pressure Rating | PN 6 / PN 16 / PN 25 (up to PN40)

Maximum Allowable Temperature | 350 °C

Minimum Allowable Temperature | -10 °C (up to -26 °C in some operating conditions)

Connection Method | Flange connection (DIN standard)

Valve Body Material | Gray cast iron (EN-GJL-250 / JL1040), ductile iron (EN-GJS-400-18-LT / JS1025), cast steel (GP240+N GH), 

stainless steel (1.4408)

Filter Screen Material | Stainless steel filter screen

Filtration Accuracy | Coarse sieve / Fine sieve (optional)

Product Certifications and Standards: BOA-S filters comply with DIN/EN standards, and the valve body material meets the 

requirements of the European Pressure Equipment Directive (PED 2014/68/EU). EN 10204 is available. Material certification. 

Our products are widely used in high-temperature and high-pressure applications such as steam, heat transfer oil, and hot water. 

ATEX explosion-proof certified versions are available upon request, suitable for industrial environments with flammable and

 explosive conditions.

KSB-BOA-S-Flange-Y-type-Filter Product Features and Design Advantages

1. Stainless Steel Filter Screen, Long Service Life

The BOA-S uses a high-quality stainless steel filter screen with excellent corrosion resistance and a long service life,

 effectively reducing maintenance frequency and replacement costs.

2. Equipped with Drain Plug for Convenient Maintenance

The product comes standard with a drain plug/discharge bolt, making filter inspection and cleaning simple and easy. 

Especially for large-diameter filters, drainage can be completed without disassembling the pipeline.

3. Filter Replacement Without Removing Insulation Layer

Using studs as a centering auxiliary device, filter replacement can be done quickly and effortlessly without removing 

the housing insulation layer, significantly reducing maintenance time and costs.

4. Abundant Material Options and Strong Adaptability to Operating Conditions

Depending on the media and operating conditions, various valve body materials are available, including gray cast iron, 

ductile iron, cast steel, and stainless steel:

Material | Applicable Scenarios

Gray Cast Iron (EN-GJL-250 / JL1040) | Conventional water systems, heating systems

Ductile Cast Iron (EN-GJS-400-18-LT / JS1025) | High pressure, low temperature impact conditions

Cast Steel (GP240+N GH) | High temperature steam, heat transfer oil systems

Stainless Steel (1.4408) | Corrosive media, pharmaceutical/chemical industry

5. Excellent High Temperature Resistance

The maximum allowable operating temperature can reach 350 °C, suitable for high-temperature hot water, heat transfer 

oil, and steam systems.

Core application areas

BOA-S filters are widely used in the following industries and scenarios:

Application areas Typical scenarios

Hot water heating systems Boiler rooms, district heating, thermal stations

Air conditioning system Central air conditioning cooling water/chilled water circulation

Process Engineering Chemical Processes, Pharmaceutical Production, Food Processing

Chemical industry chemical reactor, distillation tower, heat exchanger protection

Steam system: Main steam pipeline filtration, steam equipment inlet protection

Thermal oil system: heat medium circulation, high temperature hot oil filtration

Common industrial media: water, oil, gas, low-temperature materials, etc.

Installation and Maintenance Guide

Installation precautions

Installation location: should be installed at the inlet end of equipment that needs protection (such as pressure reducing 

valves, traps, pump units)

Flow direction confirmation: During installation, it is necessary to confirm that the flow direction arrow on the filter body is

consistent with the flow direction of the pipeline medium.

Space reservation: Sufficient space should be reserved under the filter for sewage discharge and filter removal.

Support measures: It is recommended to install independent pipeline supports for large-diameter filters to avoid weight 

acting on the connecting flange.

Maintenance steps

Close the valve: Close the stop valves upstream and downstream of the filter to cut off the flow of media

Pressure relief operation: slowly open the drain plug to release the pressure inside the filter

Remove the filter: Open the filter cover and take out the filter assembly

Clean the filter: Use a soft brush or compressed air to clean the impurities on the filter (replace if necessary)

Reinstall: Reinstall the cleaned filter, check the sealing gasket, and tighten the cover

Resume operation: slowly open the upstream and downstream valves and check for leaks

Maintenance reminder: It is recommended to check the status of the filter regularly. The cleaning cycle of the filter depends 

on the cleanliness of the medium and the operating conditions of the system.

Summary of product advantages

Advantages Description

✅ German quality, century-old KSB brand, German engineering design standards

✅ Ultra-high temperature resistance, can withstand high temperature media up to 350°C

✅ Stainless steel filter, corrosion-resistant, long life, good filtration effect

✅ Disassembly and maintenance-free. The filter can be replaced without removing the insulation layer, saving maintenance time.

✅With drain plug, inspection and emptying are simple and easy

✅ Flexible materials: various choices of cast iron, ductile iron, cast steel, and stainless steel to adapt to different working conditions

✅ Complete caliber DN 15 – DN 400 full coverage

Selection suggestions

Please select according to the following working conditions parameters to ensure that the filter meets the system requirements:

Medium type: water/steam/thermal oil/corrosive medium (specify the specific medium)

Operating temperature: maximum/minimum temperature (°C)

Working pressure: system pressure (bar)

Pipe diameter: nominal diameter (DN)

Filtration precision requirements: coarse screen / fine screen

Material requirements: whether stainless steel or special alloy material is required

Application scenarios: heating system/steam system/chemical process/other

Why choose us?

Authorized channels: As an authorized agent of KSB valves, we provide 100% original and authentic guarantee

Ready stock: stock of common specifications within the range of DN15-DN300

Full model coverage: DN 15 – DN 400 full series, covering PN6/PN16/PN25/PN40

Fast delivery: Standard specifications are shipped out on the same day, and special materials/specifications can also be 

responded to quickly.

Professional technical support: Provide selection guidance, installation suggestions and after-sales service

Important note: This product is an original KSB product, please look for the KSB brand logo. Choosing non-original substitutes

 may lead to safety hazards such as substandard performance and sealing failure. It is recommended to purchase through formal 

authorized channels.