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About Us

The company was established in Oslo, Norway in 1947 by engineer Svein Dyrhoff. From 1947 to 1993, the company operated under the name ing. Svein Dyrhoff. In 1957, a new mechanical workshop was established in Elverum north-east of Oslo and in 1977 the business was moved from Oslo to Elverum.

Initially, the company’s business was orientated towards the local water supply, heating and sanitation industries and included products such as oil/wood-fired central heating systems, hot water tanks and pressure expansion tanks.

Dyrhoff A/S was established as a limited liability company in January 1994 continuing the business of ing. Svein Dyrhoff. At that time, production of oil/wood-fired heaters and hot water tanks was discontinued and a new business - production of electro vessels – was started in co-operation with ASEA Per Kure. The same electro vessels are still produced by Dyrhoff A/S but now in co-operation with Varmeteknikk A/S.

Manufacturing of mechanical equipment for the hydropower industry has and continues to be an important business for Dyrhoff A/S. Initially, the company worked as a supplier of bespoke equipment to Kvaerner Bruk A/S but, more recently, Dyrhoff A/S has become an independent supplier of spillway gate systems and inflatable rubber gates. This business is carried out in co-operation with Obermeyer Hydro Inc. of the USA and Sumitomo Electric Industries, Ltd. of Japan. In 2003, Dyrhoff A/S signed a license agreement with Sumitomo Electric for transfer of all Sumigate inflatable rubber gate design technology to Dyrhoff A/S. Today, Dyhroff A/S holds the exclusive worldwide rights for the sale of Sumitomo-manufactured rubber gates in all countries except Japan. The company also works in very close co-operation with Obermeyer Hydro supplying and installing the unique, patented, pneumatically-operated Obermeyer spillway gate system.

In 1997, Dyrhoff A/S established a separate division for crane hydraulics and lifting equipment. In these fields, the company co-operates with Gjøvik Kran and Hydraulikk A/S and Øyhaugen A/S for sales, assembly and servicing of Jonsred, Loglift and Hiab kolli - wood cranes.

Dyrhoff A/S also has a mechanical workshop in which stainless steel pressure tanks, forms for the concrete industry and special orders for local industry make up the largest part of the company’s production.

Dyrhoff A/S currently has 22 employees.

© 2003 Aksel Økseter