DUAP

What DUAP does

DUAP AG is a Swiss independent manufacturer of fuel injection systems for large-bore internal combustion engines, headquartered in Herzogenbuchsee since its founding in 1943. The company designs, manufactures, and services precision injection systems (common rail, PLN mechanical, micro-pilot ignition, hydrogen direct injection) and a full range of spare parts (pumps, plungers, barrels, nozzles, valves, pre-chambers) for engines in the 500 kW to 20,000 kW power band. It serves engine manufacturers, shipyards, fleet operators, and railway companies across marine shipping, stationary power generation, rail, and specialized vehicles, and has developed a particular focus on alternative and sustainable fuels including LNG, CNG, hydrogen, methanol, ammonia, and biofuels. Duplication and service capability are anchored by three integrated revenue streams: equipment sales, the DUAP RECON reconditioning service (up to three recon cycles per unit with "as new" guarantee), and the renewed DUAP HÄRTEREI industrial heat treatment facility serving external Swiss industrial customers. Distribution is hybrid: five named regional sales managers cover Asia, Europe/Middle East/Africa, Scandinavia/Africa, and Americas/Oceania, supported by a distributor network across 60+ countries; on-site engine service worldwide is delivered through the wholly-owned French subsidiary ALLIANCE FRANCE (ADR Alliance Diesel Refit), which is an official YANMAR service partner with special expertise in Everllence (formerly MAN Energy Solutions) engines. The company is privately held with no disclosed parent company, funding rounds, revenue, or public listing, and operates with 11–50 employees under ISO 9001 certification.

Name

DUAP

Legal name

DUAP AG

Website

https://duap.ch

Company type

Private

Founded year

1943

Operating status

Operating

Headcount range

11–50 employees

Short description

DUAP AG is a Swiss precision manufacturer, founded 1943 and headquartered in Herzogenbuchsee, that designs, produces, and services fuel injection systems and spare parts for large-bore engines (500 kW–20,000 kW) serving marine shipping, stationary power generation, rail, and specialized-vehicle operators worldwide.

Ownership category

akta.pro rank

Headquarters

HQ city

Herzogenbuchsee

HQ country

Switzerland

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Fuel Injection Systems and Components: DUAP designs, manufactures, and sells fuel injection systems and related components (injectors, pumps, nozzles, valves, plungers, barrels, pre-chambers, spare parts) for large engines running on conventional, alternative, and sustainable fuels. Revenue is generated through direct sales of equipment to engine manufacturers, shipyards, fleet operators, and railway companies. The company also develops customized injection solutions and brings them from prototyping through to mass production.
2. DUAP RECON Reconditioning Services: Reconditioning service for injectors, pumps, and pressure valves. After 4,000–6,000 hours of operation, critical parts are replaced, components cleaned, reassembled, and tested. The recon process can be performed up to three times per unit, with an 'as new' guarantee. Revenue is generated through service fees for each recon cycle performed, and via an optional automatic renewal/overhaul service.
3. DUAP HÄRTEREI Industrial Heat Treatment Services: Heat treatment services offered to external Swiss industrial customers through the DUAP HÄRTEREI hardening shop, which was completely renewed in 2024. Services include vacuum hardening, nitriding, carburizing, annealing, solution annealing, tempering, and cryogenic treatment for a wide range of steel types. Revenue is generated through per-part processing fees, with optional pick-up and delivery (Hol- und Bring-Service) covering routes across Switzerland.

Go-to-market motion2 records

Distribution channels5 records

Marketing channels5 records

Core offering

DUAP designs, manufactures, and sells precision fuel injection systems and components for large 4-stroke engines (500 kW to 20,000 kW), covering common rail, PLN, and dual-fuel architectures and supporting conventional (diesel, HFO) and alternative fuels (LNG, CNG, hydrogen, methanol, ammonia). The company also provides DUAP RECON reconditioning services for injectors, pumps, and pressure valves; on-site engine servicing for ships and power plants through its ALLIANCE FRANCE group company; and industrial heat treatment (vacuum hardening, nitriding, carburizing) through its in-house DUAP HÄRTEREI facility for both internal production needs and external Swiss industrial customers.

Product overview

DUAP is a Swiss manufacturer specializing in fuel injection systems for large 4-stroke engines (500 kW to 20,000+ kW output). The core product portfolio centers on fuel injection systems supporting conventional fuels (diesel, HFO), dual-fuel, and alternative/sustainable fuels (hydrogen, LNG, CNG, methanol, ammonia, biofuels). Key products include complete injection systems, hydrogen direct injection, micropilot ignition systems, and a comprehensive range of spare parts (pumps, plungers, barrels, nozzles, valves, pre-chambers). The company also offers DUAP RECON, a top-quality reconditioning service for injectors, pumps, and pressure valves with up to three cycles and an 'as new' guarantee. Through its DUAP HARDENING SHOP division, the company provides industrial heat treatment services to external customers including hardening, vacuum hardening, nitriding, and related processes for various steel types. The group also includes ALLIANCE FRANCE for on-site engine services for ships and power plants, specializing in Everllence and YANMAR engines.

Differentiator

Problem solved

Functional benefit

Brands

• DUAP RECON: Reconditioning service for injectors, pumps, and pressure valves offering maintenance and renewal services for engines
• DUAP HÄRTEREI
• ALLIANCE

Products and services

• Fuel Injection Systems for Diesel, HFO, and Dual-Fuel Large 4-Stroke Engines Complete fuel injection systems (common rail and PLN) for diesel, HFO, and dual-fuel large 4-stroke engines with outputs from 500 kW to 20,000 kW, sold to engine manufacturers, shipyards, fleet operators, and railway companies.
• Fuel Injection Systems for Alternative (Gaseous) Fuels Fuel injection systems for gaseous alternative fuels including natural gas, LNG, CNG, hydrogen, methanol, and ammonia for large engines using sustainable fuels.
• Hydrogen Direct Injection Systems for Large Engines Direct injection systems for hydrogen fuel in large combustion engines, delivering short injection times to increase power density and engine efficiency with associated micro-pilot ignition support for marine and stationary applications.
• Micro-Pilot Ignition Systems for Gas Engines Micro-pilot injection systems that ignite difficult-to-ignite gases (natural gas, hydrogen) by injecting a small diesel or biodiesel pilot charge via a separate pump, high-pressure line, and injector alongside the main gas injector.
• Customized Injection Solutions Customer-specific development of fuel injection systems, from analysis and design through prototyping, simulation, testing, and series production, tailored to engine manufacturers and fleet operators.
• Fuel Pumps (Common Rail and PLN) Standalone common rail and mechanical PLN fuel pumps for large 4-stroke engines, sold as spare parts and replacement components with advanced coatings, sealing elements, and valve technology.
• Plunger and Barrel Sets Precision plungers and barrels for fuel pumps, designed and manufactured in-house for replacement and maintenance of DUAP fuel injection pumps.
• Fuel Injection Nozzles with ADLC/TIN Coatings High-precision fuel injection nozzles with advanced ADLC and TIN coatings, sold as spare parts for fuel-saving and longer service life in large engines.
• Fuel Injection Valves Precision fuel injection valves manufactured in-house in Switzerland and sold as replacement components for DUAP fuel injection systems.
• Pre-Chambers for Gas Engines High-quality, temperature-resistant pre-chambers for gas engines, manufactured in Switzerland and sold as replacement components for DUAP gas fuel injection systems.
• Spare Parts and Kits for Fuel Injection Equipment Comprehensive range of in-house designed spare parts and kits (pump elements, roller tappets, seal kits, connectors, high-pressure lines, pipes, injection nozzles, etc.) for DUAP fuel injection systems.
• DUAP RECON Reconditioning Service Factory-grade reconditioning service for DUAP injectors, pumps, and pressure valves, performed after 4,000–6,000 operating hours and repeatable up to three cycles per unit with an 'as new' guarantee.
• ALLIANCE Engine Services (On-Site) On-site engine services delivered worldwide by ALLIANCE FRANCE (a DUAP group company), including technical audits, repair, recon, refit, spare parts, performance optimization, commissioning, and preventive maintenance for large engines on ships and in power plants, with particular expertise in Everllence and YANMAR engines.
• DUAP HÄRTEREI Industrial Heat Treatment Services Outsourced industrial heat treatment (hardening, vacuum hardening, nitriding, carburizing, annealing, solution annealing, tempering, carbonitriding, soft nitriding, nitrocarburizing, precipitation hardening, cryogenic treatment) for a wide range of steel types, offered to external Swiss industrial customers and DUAP's internal production, with pick-up and delivery available.
• Industrial Services (Contract Manufacturing of Complex Parts and Assemblies) Contract manufacturing services for selected customers, covering production of complex parts and assemblies including hardening and assembly operations.

Quantifiable outcome

• Engines from 500 kW to 20,000 kW supported with fuel injection equipment; even wider range achievable with serial pressure sensor elements
• +3 more outcomes

Named customers5 records

Segments6 records

Ideal customer profiles6 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature9 records

Partnerships

Two partnerships are on record, tiered core and minor.

• ALLIANCE FRANCE (ADR Alliance Diesel Refit)coreStrategic or Co-development PartnerALLIANCE FRANCE is a DUAP group company (ADR Alliance Diesel Refit) that offers spare parts, technical assistance, and service for engines directly on ships and in power plants worldwide. ALLIANCE technicians have special expertise in Everllence (formerly MAN Energy Solutions) and YANMAR engines. The company is an official YANMAR service partner for commercial marine engines, offering technical audits, repair, recon, refit, custom parts, performance optimization, commissioning, and preventive maintenance services.
• YanmarminorChannel Partner/ Reseller/ DistributorALLIANCE FRANCE is an official YANMAR service partner for commercial marine engines, providing on-site service, maintenance, repair, and recon services for YANMAR-powered vessels and installations. This is a channel partnership where ALLIANCE (on behalf of DUAP) provides certified service for YANMAR engines in the marine commercial segment.

Scale indicators5 records

Recent moves6 records

Expansion highlights5 records

Market position

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutu.be/TlbA4l2ejk4

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 records

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about DUAP