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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,041 companies indexed · Last updated: today
DirectoryIndustryMechanical Engineering IndustryHerzogenbuchseeDUAP AG
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DUAP AG

Summary

About the company

DUAP AG develops and manufactures fuel injection systems, fuel pumps and spare parts for large engines and provides reconditioning, repair and maintenance services. The company also produces injectors, valves and complete assemblies and offers industrial services such as heat treatment in its hardening facility.

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Industry:Mechanical Engineering Industry
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12
Injection systems for Diesel & Dual Fuel
Injection systems for large-bore engines running on diesel, HFO and dual fuel, as Common-Rail or PLD solutions, including spare-part support for applications from 500 kW to 20,000 kW.
Injection systems for alternative fuels
Blow-in systems for gases and pure hydrogen for large-bore engines using alternative, sustainable fuels; developed for high power density and efficiency.
Micro-Pilot injection for gas engines
Micro-Pilot injection systems for gas engines for igniting hard-to-burn gases such as natural gas using a small amount of diesel.
Fuel pumps
Fuel pumps for large-bore engines, including Common-Rail pumps and mechanical PLD pumps for various fuels such as MDO, HFO and biofuels.
Injection nozzles
Injection nozzles manufactured in-house, focusing on precise radiusing, grooves, blind bores and coatings such as ADLC/TIN.
Injection valves
Injection valves manufactured in-house in Switzerland, designed for high functionality and long service life.
Pump plungers & cylinders
Pump plungers and cylinders, designed, manufactured and tested in-house, as spare parts for injection systems.
Pre-chambers for gas engines
Pre-chambers for gas engines made in Switzerland, with temperature-resistant base materials and designed for long service life.
Spare parts
Spare-part range including pump elements, roller tappets, sealing and spare-part kits, connecting parts as well as high-pressure lines and pipes.
Customer-specific injection solutions
Tailor-made injection systems and components, including analysis, consulting, project management, development, prototyping, simulation, testing and series production.
Reconditioning (DUAP RECON)
Overhaul and renewal of injectors, pumps and pressure valves with cleaning, reassembly, testing and optional automated renewal service.
Heat treatment
Heat treatment of steel parts in our own hardening facility, including hardening, case hardening, vacuum hardening, annealing, tempering, nitriding and other processes.
Reviews

Aggregated rating

Aggregated rating
5
of 5

Aggregated from 4 reviews across all connected sources

Sources
GGoogle54
★TrustpilotSoon
PProvenExpertSoon

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Press

Media

October 7, 2020Media
Das ist der beste Polymechaniker der Schweiz
bernerzeitung.ch
April 17, 2018Media
Hier ist der Dieselmotor weiter in
bernerzeitung.ch

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Location

Waldgasse 19
3360 Herzogenbuchsee

At a glance

Legal form
Corporation
UID
CHE-102.628.670
Founded
1948 · 78 years
Last commercial register change
August 16, 2024
Employees
51 to 100

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