Based in Herzogenbuchsee, Switzerland, DUAP AG operates as an independent developer and manufacturer specializing in fuel injection systems for large-bore combustion engines. Established in 1943, the company has evolved from a general industrial manufacturer into a niche expert within the global maritime and power generation sectors. Unlike many competitors that function as subsidiaries of massive engine conglomerates, DUAP maintains a distinct status as a family and foundation-owned enterprise. This independent structure allows the firm to collaborate across the industry, supplying components and services to various engine builders and end-users without exclusive ties to a single original equipment manufacturer.
The core of DUAP’s operations revolves around the precision engineering required for marine propulsion. The company designs and produces complete injection systems, including nozzles, pumps, and injectors, specifically tailored for the demanding environments of ocean-going vessels. These components are critical for the reliable operation of both two-stroke and four-stroke diesel engines, which serve as the primary power sources for merchant ships, tankers, and other large marine assets. Beyond new manufacturing, the company has established a significant footprint in the maintenance and refurbishment sector. Through its headquarters in Switzerland and international subsidiaries in the United States and France, the firm provides reconditioning services that extend the operational lifespan of existing engine components, aligning with industry efforts to reduce waste and operational costs.
In response to the maritime industry's ongoing shift toward decarbonization, the company has expanded its engineering focus to encompass alternative fuel technologies. DUAP develops injection solutions compatible with dual-fuel engines, allowing vessels to utilize cleaner energy sources such as liquefied natural gas and hydrogen while maintaining the capability to run on traditional heavy fuel oil when necessary. This adaptability helps shipowners and operators navigate tightening environmental regulations regarding emissions. The company’s engineering capabilities also extend to updating older engine platforms with modern injection technology, aimed at improving fuel efficiency and reducing particulate matter without requiring complete engine replacement. By combining Swiss manufacturing precision with a global service network, DUAP functions as a key supply chain partner for fleet operators and engine builders requiring specialized, high-durability fuel systems for the rigorous conditions of the open sea.
