Ball valve and flow control solutions for hydrogen applications
With years of experience in the gas sector, MHA ZENTGRAF offers reliable ball valve solutions for the hydrogen sector:
- Oroven MHA quality, ISO9001 certified
- PED 2014/68/EU as well as ISO11114 compliant materials for hydrogen
- High pressure leak test with nitrogen up to 880 bar and / or helium leak test
- Manual or automated product solutions
Since 2020 MHA ZENTGRAF is member of the German Hydrogen and Fuel Cell Association.
Why ball valves in hydrogen applications?
Ball valves offer an unbeatable advantage over other types of valves: full flow cross section in open position!
A DN13 ½“ ball valve has a Cv value of 22 gal / min. This Cv value can only be reached with sizes of approx. DN32 (1 ¼“) at other valve types, e.g. globe or needle valve". In addition, ball valves can be used to achieve a high degree of leakage free closure.
Our solutions for H2 apllications
MHA ZENTGRAF offers product solutions for applications along the entire hydrogen process chain. From manufacturing to transport / storage to fueling systems for hydrogen vehicles.
This application includes systems e.g. for electrolysis or power-to-gas systems. These systems typically work at pressure levels of up to 30 bar. Of course, ball valves from MHA can also be used at these lower pressure applications. Larger nominal widths of up to 4“ can also be offered to ensure maximum flow capacity. A leakage rate A according to DIN EN 12266 is guaranteed even at larger nominal diameters.
- Sizes: up to DN100 (4“) full flow
- Connections: threaded, flanged
- Manual or automatic actuation
Transportation and storage at medium pressure ranges
Gas transportation and storage usually sets higher requirements for valves. The pressure levels in this area are approx. 350 to 500 bar. During transport, vibrations and weather influences can put heavy strain on the system equipment. In addition, these valves are sometimes switched more frequently because filling and drain processes are carried out regularly.
For use as a maintenance valve, with occasional operations, we recommend our proven ball valves with gas seat system using hydrogen-compatible materials.
For ball valves with higher operation frequencies, we offer a special valve stem design for this area of application. Our ball valves are designed for switching under full differential pressure. On request, our ball valves can be supplied as a complete unit with assembled and tested actuator. These ball valves already meet the requirements of the new ISO 23826 and can probably be used for TPED-relevant areas starting mid of 2022.
Compression and storage at high pressure levels
The possibility of higher compression for hydrogen during transport and storage improves the efficiency of the systems, saves installation space and, last but not least, reduces costs.
Many storage and transport systems in the hydrogen sector are therefore already working at pressure levels of up to 600 bar.
With the new HFKH650 ball valve, MHA offers a reliable ball valve for this application. This ball valve can be used at operating pressures of up to 650 bar. In addition, it has a torque-optimized design so it can be conveniently switched by hand even at full differential pressure. The new ball valve series already meets the requirements of the new ISO 23826 standard and can probably be used for TPED-relevant applications starting mid of 2022.
Ball valve series HFKH
- Sizes: DN 13 (1/2“), DN20 (3/4“)
- Pressure rating: 650 bar
- Connections: threaded, flanged
- Tested according TPED guideline (ISO 23826)
- Rapid gas decompression proven o-rings
- Materials according ISO11114
H2 dispenser stations
In the case of hydrogen dispenser stations, a general differentiation must be made between car and truck fueling systems. Truck fueling systems work at operating pressures of approx. 350 bar. Car fueling systems, on the other hand, work at operating pressures of approx. 800 bar and higher.
Both variants have high requirements of switching frequencies for valves used in the fueling process. The switching frequencies are currently low due to the low prevalence of hydrogen vehicles. However, in medium term, the valve technology must be designed for much higher switching frequencies if more hydrogen vehicles are used.
For fueling systems for trucks, MHA offers its optimized ball valve design for increased switching frequencies. The ball valves are designed for switching under full differential pressure. Usually ball valves for refueling systems are operated by a pneumatic rotary actuator. Upon request, you can receive the complete unit consisting of ball valve and actuator from MHA.
MHA is currently developing a new ball valve concept for car refueling systems that require pressure levels up to 1,000 bar. The approach of the new concept is to meet the high requirements of ISO 19880 standard which , among other features, requires a lifetime of at least 100,000 switching operations under full differential pressure.