Operations were taken over by Lars Schuberth and Albrecht Behm, and the range of products was expanded to include water, waste-water, and HVAC products.
As general agents the company now had great success with several well-known brand names; KWC’s “spakblandar” programme for public spaces; sewerage systems and cisterns in plastic from Geberit; sanitation products from the Dutch company Sphinx and bathtubs from the Italian manufacturer Zoppas.
One of the most important events in the company's history took place in 1970 when the company was made general agent for Conex fittings for HVAC installations. The agency for these fittings that save on installation time came about because of the demand by heating and plumbing wholesalers and sales took off. Conex become the cornerstone of LK’s continued growth and profitability that was used to create a nationwide distribution network of installers and heating and plumbing wholesalers. The sales force continued to have access to new time-saving heating and plumbing products and systems to launch in the Swedish construction market.
With these successes the company grew in size. The old industrial building in Bromma was purchased in 1977 and an office and warehouse was built in Malmo, Helsingborg and Oslo in 1980, 1987 and 1990 respectively. In addition to the property in Oslo, Lagerstedt & Krantz Fastigheter AB markets, owns and manages other business sector properties in the company.
Over time, LK transformed from a trader of other companies’ products into a developer and producer of its own, more technically advanced, products and solutions.
LK starts manufacturing and selling a self-produced underfloor heating system.
The company was sold to the Behm family and Stikkan Anderssons’s Music Sweden AB. The Behm family would finally take overthe whole company in 1995. The company’s first location outside Sweden is established in Oslo.
LK Armatur is established in Helsingborg when LK increases its focus on supplying manufacturers of heaters and water heaters with valves and components. The company manufactures valves, components and prefabricated units for the global plumbing market.
For the further development of LK’s heat and tap water systems polyethylene pipes took on a central and strategically important role. With the task of developing and manufacturing this kind of pipe the company LK Pex AB was set up in Ulricehamn. Today, from its own factory, the company supplies not only its sister companies LK Systems and LK Armatur, but also retailers in Europe, the USA and the Middle East with its proprietary quality pipes.
LK started to produce and sell high-quality PE-Xa pipesat its production facility.
LK Armatur opens its production facility in Zrenjanin, Serbia. The Serbian production facility is an exact reflection of the pipe production in Helsingborg and is primarily used to produce prefabricated pipe systems in copper and stainless steel.
LK Systems grows and establishes a new company in Finland.
LK Armatur acquires Acaso and broadens its product range with energy-saving products for the heating industry.
The separate company LK International is established with the aim of being able to offer the UK market products from the LK Group’s three business areas - LK Armatur, LK Pex and LK Systems.
LK inaugurates a modern pipe factory of 10,000 m2. in Ulricehamn.
A single common brand platform is developed. All subsidiaries now belong to the one and the same brand - LK.
LK Armatur establishes its own sale company with office and warehouse in Germany, LK Armatur Deutschlad GmbH.
The office is located in Bad Oeynhausen and also establishes salesmen throughout Germany.
LK celebrates 110 years, 1910 - 2020.
LK Systems and Quandify commence collaboration.This new and unique water meter uses patented technology. In addition to this collaboration, LK also becomes a part-owner of Quandify.