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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryIndustryMechanical Engineering IndustryHerzogenbuchseeDUAP AG
DUAP AG Logo
Verified· 4 sourcesTrust Score
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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Products & services

Industry:Mechanical Engineering Industry
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DUAP AG

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.
Trust & reputation

ranQ Trust Score of DUAP AG: 4.3 out of 5.0

Trust Score4.3/ 5.0

Very high

x

Data basis 100% · As of October 2026

DUAP AG scores 71.6 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.75.024%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.40.910%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.100.08%
DUAP AG scores 94.3 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.90.07%
DUAP AG scores 86.7 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).86.722%
DUAP AG scores 42.9 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.65.74%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.20.04%
Qualifications+0.00

DUAP AG reaches a ranQ Trust Score of 4.3 out of 5.0 — rated «Very high». The rating draws, among other things, on 5.0 out of 5 stars from 4 customer reviews. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
5
of 5

Aggregated from 4 reviews across all connected sources

Sources
GGoogle54
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

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
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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