Kolk is a manufacturer and supplier of fittings such as valves, hydrants, check valves and accessories for water supply and sewage network. We are expert in supplying the (drinking) water market at home and abroad. In addition to the delivery of products, we also offer specialized project support. Our range of products includes valves, hydrants, flange fittings and accessories. We have, based on years of knowledge and experience, specialized in the supply to the (drinking) water supply market. Our focus on this market is to act as a `one stop shop`. We also offer professional project support to pipeline projects. On the Dutch market, we have been a reliable partner for a long time for the major water supply companies and their suppliers (contractors). Our products are delivered to international groups and contractors for the European and African markets.
Kolk is a manufacturer and supplier of fittings such as valves, fire hydrants, check valves and accessories for the water and wastewater network. We are experts in supplying the (drinking) water pipeline market at home and abroad. In addition to the delivery of products , we also offer specialist project support.
About our organization
Our modern company has a rich history . We have a flexible organization with short communication lines and a full focus on the customer's needs. Flexibility, reliability, quality and sustainability are the core objectives of the organization.
Our products and services
Our range includes valves, fire hydrants, flange fittings and accessories. We have, from years of knowledge and experience, specialized in supplying to the (drinking) water supply market. Our focus for this market is to act as a 'one stop shop'. We also offer professional project support for the construction of pipe constructions .
Our product package is characterized by:
- technically high-quality products,
- innovative solutions,
- a wide variety,
- a large stock,
- own production and coating facilities,
- short lead times,
- flexible product adaptation to customer demand.
All our products comply with all relevant national and international standards and product qualifications .
In the Dutch market we have been a reliable partner for the large water companies and their suppliers (contractors) for years. Our products are purchased for the European and African markets by international groups and contractors. Also view our references.
More information about Kolk
We have a wide range in stock, so you quickly have well-functioning products. Our expert staff is ready for service and support. Thanks to our years of experience you can always count on expert advice. Would you like to know more about Kolk?
Appendagefabriek Kolk was founded in 1922 with the support of the Dutch water companies. The aim was to be able to guarantee a Dutch share in the supply of materials during the construction and expansion of the drinking water pipeline network. To this day, Kolk is an independent family business in which the fourth generation is active. With the knowledge and experience built up by rich history, the products developed and manufactured by Kolk are continuously further developed, improved and modernized.
Knowledge and experience form the basis for progress
The first Kolk hydrant was designed in 1923 and our fire hydrants are still a household name. In the past, Kolk has supplied many products to the former Dutch colonies such as Indonesia, Surinam and the Antilles. In the sixties, shipbuilding, in particular tanker construction, was a major customer of the products.
All the valves were supplied by Kolk for the construction of the Oosterschelde storm surge barrier.
Technological developments are a common thread through the history of Kolk. The developments that have taken place in recent years in the drinking water supply have translated into an expansion of the product range, product innovation, short delivery times, modern distribution channels, etc. The products and production techniques have been continuously adapted to the latest state of technology and the need from the market.
Kolk has developed over the years from a traditional production company into a modern flexible organization. The organization now concentrates on the composition, coating and testing of high-quality products in which the raw materials and components are sourced from a worldwide network of qualified suppliers.
Highlights from the history of Kolk
Below you will find an overview of some highlights from the history of Kolk.
1923: the first fire hydrant
The first Kolk fire hydrant was designed in 1923. Our fire hydrants are still a household name.
From 1923 until after the Second World War
In the past, Kolk has supplied many products to the former Dutch colonies such as Indonesia, Surinam and the Antilles.
The 60s: shipbuilding
In the sixties, shipbuilding, in particular tanker construction, was a major customer of the products.
The 70s and 80s
The construction of the Oosterschelde storm surge barrier was approved in 1979 by the parliament, after which the construction was started. Kolk has delivered all valves for the storm surge barrier.
From past to present
Technological developments are a common thread through the history of Kolk. The developments in the drinking water supply of recent years have translated into Kolk among others:
- an extension of the product package,
- product innovation,
- short delivery times and
- modern distribution channels
The products and production techniques are constantly adapted to the latest technical developments and the need of the market. The organization now concentrates on the composition, coating and testing of high-quality products in which the raw materials and components are sourced from a worldwide network of qualified suppliers.
The facilities of Kolk in Hengelo guarantee complete control of the product cycle in-house, from design to dispatch and administrative handling. The design department uses 3D CAD systems, which are used for engineering of own products and for customer-specific solutions. Kolk has a modern machine park at its plant. The machine park is tailored to the needs of the market, where quality, flexibility and production costs are important preconditions. The production capacity and stock positions are set to short delivery times (also for customization)
The production facilities consist of:
- Machining (CNC)
- Create parts
- Steel blasting and coating (GSK certificate)
- Assembly, extorting, testing and final inspection
- Packaging and shipping
Delivery reliability and short lead times are core values in Kolk's policy. The production capacity and production planning are fully geared to this. Coating of the products plays a crucial role in this. Kolk can guarantee quality and lead time by independently carrying out all coating work.
The facilities consist of:
- Turning (CNC)
- Milling (CNC)
- Drilling and tapping
All operations are concluded with a quality check