Manufacturer of metal-sealed specialty ball valves, wellheads and Kelly valves for energy and high-pressure applications

Hartmann Valves GmbH

Burgdorf-Ehlershausen · Celle · MengkofenNew on Amplifa

1946Founded

230Employees

3Locations in Germany

690 bar / -200 to +550 °CDesign range of the valves

About Hartmann Valves

Hartmann Valves GmbH is a family-owned company founded in 1946 and now run by the third generation, with locations in Burgdorf-Ehlershausen and Celle. The company manufactures metal-sealed, gas-tight specialty ball valves (including Twin Ball Valves and pigging valves), API 6A-compliant wellheads and API 7-1-compliant Kelly Valves. Design, assembly and testing take place exclusively at the German plants in Celle and Burgdorf-Ehlershausen. The products are designed for pressures up to 690 bar and temperatures from -200 to +550 °C and are made from steel, high-strength steels and nickel-based alloys; seat surfaces are hardfaced with tungsten or chromium carbide. Customers come from geothermal energy, oil and gas, energy transport, storage technology, chemicals/petrochemicals, power plant engineering, as well as the future fields of hydrogen, CO₂ (CCS/CCU), ammonia, oxygen and lithium production. Around 230 employees develop, assemble, test and service the components; a service location opened in 2026 in Mengkofen improves proximity to customers in southern Germany.

Site: Burgdorf-Ehlershausen
Processes: Manufacture of metal-sealed, gas-tight specialty ball valves (incl. Twin Ball Valve,, Manufacture of API 6A-compliant wellheads, custom-built, Manufacture of API 7-1-compliant Kelly Valves, Welded high-integrity shut-off valves for CO2 applications (CCS/CCU), Hardfacing of seat surfaces (tungsten or chromium carbide) and precision manufacturing of, Design/engineering of customised high-performance components, Assembly and testing (wear resistance tests, leak tests, e.g. with helium at 425 °C), Service: installation, maintenance and repair work as well as spare parts supply (24/7)
Materials: Nickel-based alloys, High-strength steels, Steel, Tungsten carbide (hardfacing of seat surfaces), Chromium carbide (hardfacing of seat surfaces), Tungsten carbide, Chromium carbide
Founded: 1946
Employees: 230
Industries: Geothermal energy, Oil/Gas, Energy production, Energy transport, Storage technology, Chemicals/Petrochemicals

01
Consulting and engineering
02
Custom design and development
03
Manufacturing and hardfacing of seat surfaces
04
Assembly
05
Testing
06
Installation/commissioning (e.g. wellheads)
07
Maintenance and repair service 24/7
08
Spare parts sales

Materials & Processes

Steel

Base material for high-precision ball valves and wellheads

High-strength steels

Corrosion- and pressure-resistant materials for CO₂ and high-pressure applications

NiB

Nickel-based alloys

Prevent leaks and material ageing with aggressive media such as CO₂

Tungsten carbide

Hardfacing of seat surfaces for permanently reproducible tightness

CrC

Chromium carbide

Hardfacing of seat surfaces for frequent switching cycles and pressure fluctuations

Locations

Burgdorf-Ehlershausen

Production site and founding site

Celle

Production site (design, assembly, testing)

Cold chamber (wear resistance testing)

Mengkofen

Service site (workshop, office, warehouse)

Workshop

Components

**Wellhead for geothermal energy**API 6A · Geothermal energy

**Metal-sealed specialty ball valve**Specialty valve manufacturing · Energy transport

**Twin Ball Valve with double isolation**Specialty valve manufacturing · Natural gas/storage technology

Inside the production

Assembly and testing at the Hartmann plants

Industries

Geothermal energyOil/GasEnergy productionEnergy transportStorage technologyChemicals/PetrochemicalsHydrogenOxygenCO₂ (CCS/CCU)AmmoniaPower plant engineeringLithium productionCO2 (CCS/CCU)

Processes & technical limits

Processes	Tolerance	Max. part	Weight	Lot size	Materials
Manufacture of metal-sealed, gas-tight specialty ball valves (incl. Twin Ball Valve,Valve manufacturing/Assembly	–	–	–	–	Steel, Nickel-based alloys
Manufacture of API 6A-compliant wellheads, custom-builtValve manufacturing/Assembly	–	–	–	–	Nickel-based alloys, high-strength steels
Manufacture of API 7-1-compliant Kelly ValvesValve manufacturing/Assembly	–	–	–	–	–
Welded high-integrity shut-off valves for CO2 applications (CCS/CCU)Valve manufacturing/Assembly	–	–	–	–	Nickel-based alloys, high-strength steels
Hardfacing of seat surfaces (tungsten or chromium carbide) and precision manufacturing ofSurface treatment	–	–	–	–	Tungsten carbide, Chromium carbide
Design/engineering of customised high-performance componentsEngineering	–	–	–	–	–
Assembly and testing (wear resistance tests, leak tests, e.g. with helium at 425 °C)Testing	–	–	–	–	–
Service: installation, maintenance and repair work as well as spare parts supply (24/7)Assembly	–	–	–	–	–

2 Anlagen & Maschinen

Machine	Manufacturer / model	Quantity	Working area	Year built	Site
Cold chamber (wear resistance testing)	–	–	–	–	–
Workshop (service site)	–	–	–	2026	Mengkofen

Additional services

Consulting and engineeringCustom design and developmentAssemblyMaintenance and repair service (24/7)Spare parts salesInstallation/commissioning of wellheadsResearch and developmentTesting

Reference customers

Nord StreamYara Brunsbüttel GmbHDEA Deutsche Erdoel AGStadtwerke München (SWM)Geothermische Kraftwerksgesellschaft Traunreutgec-co

History

1946
Founded as a small engineering office by Dipl.-Ing. Werner Hartmann in Ehlershausen
1979
Supply of the Bruchsal geothermal project – early commitment to geothermal energy
2015
Participation in a geothermal research project to prevent material failure
2016
Retrofit of the valve and control system on the Nord Stream Pipeline
2026
Opening of a service location in Mengkofen and 80th company anniversary