Special  >  Special valves

Overview categories   Overview all products
Laboratory valves  

Laboratory valves

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  Laboratory fittings  

Laboratory fittings

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  Snaplock coupling  

Snaplock coupling

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Flow valves  

Flow valves

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  Needle valve  

Needle valve

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  Injection valves  

Injection valves

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Dosing lances  

Dosing lances

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  Suction filters  

Suction filters

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  Inspection glass  

Inspection glass

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Kwerk GmbH - Your Strong Partner for Premium Plastic Solutions and Excellent Service

Kwerk GmbH offers an extensive range of plastic products for various applications. We specialize in plastic semi-finished products, quick couplings, specialty fittings, pipeline sampling, static mixers, and CNC turned parts Our high-quality plastic products are used in a wide range of market segments, including machinery and plant engineering, device and apparatus construction, beverage and packaging industry, and food industry.

Our plastic semi-finished products serve as raw materials for machining at our CNC machining centers and play a crucial role in the quality of the end product. At Kwerk, we provide a wide selection of plastic semi-finished products and are available for technical consultations and inquiries. Our comprehensive range includes PMMA XT tubes, PMMA XT rods, PVC-U rods, PP rods, HDPE rods, natural PE rods, PVC U hollow rods, PVC-U hexagonal rods, HDPE U-profiles, PVC-U L-profiles, PVC-U square profiles, PVC-U T-profiles, PVC-U flat profiles, PVDF sheets, ABS sheets, PVDF-ELS sheets, PC sheets, PEEK sheets, PEEK-MOD sheets, PET sheets, POM-C sheets, POM-10PE sheets, and much more.

Our plastic quick couplings, particularly the SNAPLOK COUPLINGS, offer numerous advantages and the required flexibility. In collaboration with SAFI, we provide a comprehensive program for industrial, chemical, and process engineering applications. Our quick couplings are commonly used in handling intermediate bulk containers. When it comes to flexibility and operational reliability, Kwerk is your strong partner. Donít hesitate to reach out to us.

In partnership with our strong allies, we have developed special plastic fittings for measurement technology and laboratory technology. Our product range includes laboratory ball valves made of PVC-U and PVDF, flow control fittings made of PP for measuring parameters such as pH, REDOX, and TEMPERATURE, needle valves made of PVC-U, PVC-C, PE, PP, and PVDF for precise volume flow regulation, as well as suction filters and sight glasses made of PVC-U, PP, and PVDF. Our plastic fittings are designed for use in chemical and process engineering and are CNC-manufactured from high-quality plastic semi-finished products. They are suitable for applications in flue gas desulfurization plants and wastewater treatment. When it comes to strainers and large shut-off fittings like valves, Kwerk is your partner offering a high-level full-service package.

Kwerk has also developed an innovative sampling solution for chemical and process engineering. Our sampling cabinets enable safe extraction of aggressive chemicals and liquids from running processes. Equipped with a transparent protective shield, they provide reliable protection against liquid leakage. In the event of excessive dosing, the liquid is separately discharged through an integrated overflow system. The height-adjustable plate allows for adaptation to various container sizes, and an optional extraction can be attached.

Our plastic static mixers are pipeline fittings used for effective fluid mixing. They consist of plastic pipes (PVC-U, PVC-C, PP, PE, or PVDF) with a special static mixing element inside. This mixing element influences the flow and enables mixing of gases, aqueous liquids, highly viscous liquids, and liquids with significant viscosity differences. Our static mixers ensure a homogeneous mixture of fluids and provide various degrees of mixing based on requirements.

At Kwerk, you will find a wide selection of plastic static mixers in various variants. In addition to our standard product range, we also offer customized solutions for the chemical and process engineering industry. With our extensive practical experience and state-of-the-art CNC machining centers, we manufacture high-quality plastic turned parts and plastic milled parts. We produce turned parts from different plastic materials for pipeline construction and canproduce complex milled parts according to your requirements. Our experienced team also assists with material selection and offers innovative and cost-effective solutions for your projects.

At Kwerk, we prioritize quality, timely delivery, and customer satisfaction. Our full-service approach ensures that we understand your requirements precisely and can provide you with the exact solutions you need. Donít hesitate to contact us. We are your reliable partner for plastic products and solutions.

Optimize your shopping experience with our detailed delivery information

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.