THIS IS WHAT WE STAND FOR.
DÜKER.CERTIFIED MANAGEMENT SYSTEM.
Düker has existed for more than 555 years – sustainability is not a campaign for us, but part of our corporate culture. Our management systems for quality, environment, energy and occupational safety are audited by DEKRA as an accredited certification body and regularly recertified. These systems are not an end in themselves: they give us the data basis to systematically improve our environmental performance – year after year.
Four certified management systems.
- ISO 9001 – Quality Management Consistent product quality and continuous process improvement at every level – from raw material inspection to delivery.
- ISO 14001 – Environmental Management Systematic management and reduction of our environmental impact. Energy consumption, emissions, waste and water are continuously recorded, evaluated and optimised.
- ISO 45001 – Occupational Health and Safety Safe workplaces and the protection of our employees’ health are an integral part of our management system.
- ISO 50001 – Energy Management Structured recording and reduction of our energy consumption. Measurement is carried out using calibrated meters at our production sites.
Audited. Confirmed. Visible.
Our certificates and audit seals are awarded by independent auditors and reviewed regularly. This creates accountability – internally for our processes, externally for our customers and partners.
THIS IS WHAT WE STAND FOR.
DÜKER. WATER IS OUR CORE BUSINESS. AND OUR RESPONSIBILITY.
Water is the foundation of all life – and one of the resources around which the defining questions of the 21st century will revolve: availability, quality, distribution, efficiency. Anyone who manufactures products for water supply shapes this infrastructure for decades. That is our claim – and our responsibility.
Longevity is our strongest sustainability argument.
A valve that remains in the ground for several decades and works reliably avoids what every replacement costs: new material, transport and civil works. Every product we do not have to replace saves materials, energy, emissions and disruption to the infrastructure. That is why we build our products not for the next replacement cycle, but for long-term operation. For selected product ranges, we also offer a 10-year guarantee. Please contact us.
Efficiency saves water before it is lost.
Leaks, ageing network infrastructure and inefficient valves cause significant water losses in many supply networks. Our solutions are designed to minimise these losses – through precise shut-off technology, high-quality sealing systems and smart technologies that make the condition and operation of the network transparent.
Düker since 1469. That is the long-term test.
Anyone who has been around this long does not think in quarters. We have weathered wars, crises and industrial transformations – because we have always put quality before quantity, while keeping the application in focus. This attitude is the reason customers have trusted us across generations.And it is the foundation of our work towards our sustainability goals.
Our main product groups are verified to EN 15804+A2 (EPD). This makes our sustainability performance verifiable for our business partners – not through our own statements, but through independent bodies.
VERIFIED AND CERTIFIED.
OUR PRODUCTS. INDEPENDENTLY VERIFIED.
Anyone who takes sustainability seriously has it verified. Environmental Product Declarations (EPDs) according to ISO 14025 and EN 15804+A2 are available for our main product groups – based on full life cycle assessments and externally verified by Kiwa-Ecobility Experts.
EPDs are the established standard for environmental information on construction products. They form the data basis for DGNB, BNB, LEED and BREEAM certifications and enable architects and planners to compare materials reliably.
Three verified product groups.
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Düker SML drainage pipes
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Düker butterfly valves
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Düker hydrants and gate valves
We initially provide our EPDs on request. This way, we can supply you with all relevant documents tailored to your project – including current updates and individual consultation.
What an EPD tells you.
An EPD documents the environmental impact of a product across its entire life cycle – from raw material extraction through transport and production to use and recycling. It evaluates the carbon footprint, water and energy consumption, recycling rates and resource efficiency. Verification is carried out by independent, accredited bodies.
Düker EPDs are prepared in accordance with EN 15804+A2:2019 and are valid until 28 April 2031.
CIRCULAR ECONOMY
CAST IRON IS OUR MATERIAL. AND OUR CYCLE.
Cast iron can be melted down and reused multiple times. This makes it the ideal material for water infrastructure: This makes it the ideal material for water infrastructure: durable in operation and reusable as a raw material at the end of the product's life.
Recycling is our raw material base.
Our cast iron is made from melted-down scrap. Residues from our own production also stay in the cycle: foundry sand, residual coating powder and iron dust are processed and reused.
Our SML drainage pipes are externally verified: they consist of 100 % scrap iron, documented in our EPD according to EN 15804+A2. This makes Düker the only manufacturer in Germany to produce cast iron drainage pipes entirely from recycled material.
For valves and hydrants from Laufach, the share of recycled material in the cast iron is around 95 %. The corresponding EPDs according to EN 15804+A2 have been available since April 2026.
Circular principle.
We work in a material cycle: raw material → product → use → melting down → new product. Cast iron can be melted down and reused multiple times. The same material can be in use for decades in ever new products within the water supply network.
Production in Germany with short transport routes – three German manufacturing sites in Laufach, Karlstadt and Sarstedt.
Longevity through enamel coating.
Our enamelled products achieve a particularly long service life and can be returned untreated to the cycle at the end of their life. The longer a product remains in use, the better its environmental footprint – because every avoided product replacement saves materials, energy and emissions.
Take-back guarantee.
At the end of their life cycle, we take back Düker cast products. Acceptance at our plant is free of charge for you, worldwide and with no quantity limit. Delivery to our plant is at the sender's expense. The returned material flows directly into the production of new articles.
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THIS IS WHAT WE STAND FOR
ENERGY AND WATER. MEASURABLY REDUCED.
What is not measured cannot be managed. Since 2012 we have been operating an energy management system certified to ISO 50001 and an environmental management system certified to ISO 14001. These systems give us the data basis to continuously reduce our energy and water consumption – traceable, calibrated and independently audited.
Energy consumption reduced year after year.
Between 2019 and 2025 we reduced our energy consumption by an average of 10.8 % per year. Measurement is carried out using calibrated meters for electricity and gas at our production sites.
Targeted savings of drinking water.
In parallel, we reduced our drinking water consumption between 2019 and 2025 by an average of 14.1 % per year. Our production facilities are partly cooled with process water – which relieves the demand on drinking water at our Laufach and Karlstadt sites.
THIS IS WHAT WE STAND FOR
Sustainability starts with us. In the details, too.
For us, sustainability is more than certificates and targets. It shows in everyday decisions – where habits are formed and add up. We believe: those who take responsibility on a large scale must also be consistent in the small things.
Less single-use. More circularity.
In our office and staff areas, we have replaced disposable cups: water dispensers, glass bottles and reusable cups at the coffee machines are standard.
Trade fair stands that stay.
Our trade fair presence is based on a modular system: built once, used many times. The stand elements do not end up in a container after every event but travel on to the next one. This reduces material, transport and waste – while remaining visually flexible and adaptable.
Attitude in the details.
Many of these decisions are unspectacular. But that is precisely where their effect lies: sustainability is not a campaign but an attitude that shows in many small routines.
Any questions?YOUR CONTACT PERSON.
Seefa Yazarel
Phone: +49 6093 87 115
E-Mail: seefa.yazarel@dueker.de