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Perforation 0,8 mm  

Perforation 0,8 mm

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  Perforation 1,6 mm  

Perforation 1,6 mm

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  Perforation 3,2 mm  

Perforation 3,2 mm

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Perforation 4,8 mm  

Perforation 4,8 mm

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Ensuring Flow, Protecting Performance: Hayward Strainers for Reliable Pipeline Protection

Hayward Single and Duplex Strainers, along with our compact strainers made of PVC U, PVC C, Transparent, and PP, provide effective protection for pipeline systems.

In the field of plastic plant engineering and apparatus construction, particularly in the handling of acids and alkalis, Hayward Single and Duplex Strainers, as well as our compact strainers, are widely used to safeguard equipment components such as valves and pumps in large nominal sizes. These strainers play a crucial role for plant operators as they ensure long service life and prevent potential disruptions. They offer reliable protection against contaminants and contribute to the safety and efficiency of your equipment.

In contrast to conventional Y-type strainers, our strainers feature a larger screen area and higher dirt-holding capacity. This minimizes pressure loss even when dealing with regular contaminant buildup. Flowing fluids can contain particles that may cause blockages and failures in your pipeline system. Our strainers can be installed either at the fluid inlet to specific sections of the system or directly in front of vulnerable equipment components.

Cleaning or replacing the strainer basket is quick and straightforward. By closing the shut-off valves before and after the strainer, flow can be interrupted. Emptying the housing and opening the screw cover allows easy access to the strainer basket. The angled handles make it convenient to open the screw cover manually. The external thread of the housing doesn’t come into contact with the medium, reducing the need for thread cleaning in most cases.

Hayward Single and Duplex Strainers, along with our compact strainers, are available in various sizes and materials such as PVC U, PVC C, Transparent, and PP, catering to the specific requirements of your application. They can be customized with filter elements and perforations/mesh sizes to ensure optimal filtration performance.

Rely on the reliability and effectiveness of Hayward Single and Duplex Strainers, as well as our compact strainers, to protect your pipeline systems and ensure smooth operation of your equipment. Contact Kwerk GmbH for further information on available options, and let our experts assist you in selecting the right filtration solution for your needs.

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Plastic pipe systems

Overview of plastic pipe systems
Technical information on ABS pipe systems
Technical information on PVC  U pipe systems
Technical information on PVC  U transparent pipe systems
Technical information on PVC  C pipe systems
Technical information on PP pipe systems
Technical information on PP-R pipe systems
Technical information on PE pipe systems
Technical information on PVDF pipe systems

Chemiedur - pipe

Technical information on UP-GF (FRP) pipe systems
UP-GF (FRP) pipes
UP-GF (FRP) molded parts and connection
UP-GF-PP (FRP) molded parts and connection
UP-GF (FRP) adhesive collars
UP-GF (FRP) loose flanges
Pot Strainer DN 200 - DN 500 Inliner PP/FRP Coated
Pot Strainer DN 200 - DN 500 Inliner FRP/CBL Coated
Angle Seat Strainer DN 200 - DN 400 Inliner FRP/CBL Coated
Manhole mad of FRP and PP/FRP

Plastic pipes

Calculator for cutting pipes
Guidelines for sawing plastic pipe
Leftovers in plastic pipe
Standardization of plastic pipes and molded parts
PVC U pipes deviations
Pressure loss in pipe systems out of PVC U, PVC C and ABS pipe systems
Distinction between Rp, R and G threads
Screw lengths for flange connections

Plastic fittings

PVC U transparent ball valves
Diaphragm valves
Block valves
Butterfly valves
Plastic needle valves


Plastic Valves according to ATEX

New EU guideline 2014/34/EU
Plastic Valves in EX zones
Y-Strainers PP-EL DN 15 - DN 50
Check valves PP-EL DN 15 - DN 50
Angle seat valves PP-EL DN 15 - DN 50

Bonding of plastic pipes

Bonding manual
Video showing the bonding of pipes

Plastic welding

Guidelines for extrusion welding

Grids / support grids

GFK grids
Grids out of PP -el electrically conductive
Profile support grids out of PP -el electrically conductive

Molded ventilation parts

Ventilation technology

Chemical hose

PVC transparent hose with fabric inlay

Industrial tanks and chemical containers

Dosing tanks and outer containers 35 – 1000 Liter
Salt dissolving tanks 60 -5000 Liter
Storage tanks and vats
Storage tanks for water
Safety and collecting troughs
Industrial tank delivery program
Dosing tanks with agitator
Dosing tank agitators
Dosing tanks with attachments
Dosing tanks made of sheet material
Customized chemical containers
Dosing tanks with level indicators



IBC screw caps DN 150/DN 200
IBC adapters out of PE
IBC adapters out of PP

Attachment parts for tank construction

Vapor separators
CO2 - absorbes
Revision nozzles
Block flange

Filter housings and filter cartridges

PENTEK 3G Slime Line filter housings
PENTEK 3G Standard filter housings
PENTEK Big Blue filter housings
PENTEK PP high temperature filter housings
PENTEK PP all nature filter housings
PENTEK filter bags for Big Blue filter housings
PENTEK surface filter cartridges
PENTEK filter cartridges for depth filtration
PENTEK filter cartridges with activated carbon
CINTROPUR filter systems
CINTROPUR water filters

Flange configurator

Blind flanges, loose flanges,  rectangular flanges

Chemical resistance

Table of chemical resistance for plastic pipe systems

Machined plastic parts

Screw-in parts
Threaded fittings
Screw fittings

Milled plastic parts

Loose flanges and blind flanges made of sheet material

Static mixers

Static mixers made of plastic


Single-type and double-type strainers
Pot strainer DN 300
Angle seat strainer DN 500

Flow meters

Variable area flow meters
Configuration tool for flow meters

Filter presses

Laboratory filter presses

Injection molded parts

Scraper made of PE for filter press

Kwerk Practice Blog

The Kwerk team blogs from the field here

Partnership at the highest level.