Liquid-Hydrogen Control Valves: A Chinese Unit Reports a 90 MPa Differential Test

Lead

A high-pressure-differential liquid-hydrogen control valve developed by the Chinese equipment maker Hangyang (杭氧) is reported to have passed a test at a differential of 90 MPa (about 13,050 psi) in liquid-hydrogen service.

The report comes from the China General Machinery Industry Association, which states that the valve is the first domestic control valve to pass a liquid-hydrogen test at that differential.

Facts

The valve. The test system integrated the maker's own high-pressure-differential liquid-hydrogen control valve. The source states that the valve regulated flow across a wide range over a differential falling from 90 MPa to 0.1 MPa, and that it held stability and consistency under complex dynamic load.

The source states that the valve is the first domestic unit to pass a 90 MPa differential liquid-hydrogen test. (Source: the China General Machinery Industry Association, 2026-04-23.)

The test system. The valve was part of a system that also carried the maker's 90 MPa motor-driven high-pressure liquid-hydrogen pump through a continuous four-hour liquid-hydrogen performance test.

The measured data the source reports: at an outlet pressure of 90 MPa, stable operation at a liquid-hydrogen flow rate above 100 kg/h. Specialists from the Beijing Institute of Aerospace Testing Technology (北京航天试验技术研究所) and Zhejiang Machinery and Electrical Testing Institute Co. (浙江省机电检测所有限公司) witnessed the test. (Source: the China General Machinery Industry Association, 2026-04-23.)

The service conditions. Liquid hydrogen has to be pressurised to 90 MPa at −253 °C (−423 °F). The source lists the properties it cites as making this difficult: very low temperature, a strong tendency to vaporise, easy leakage, a high expansion ratio, and flammability.

Programme context. The work sits under a national research programme on liquid-hydrogen refuelling-station equipment and safety. The source states that the team worked through hydrogen-service material study, heat management, sliding-valve dynamic control, low-temperature high-pressure sealing, and motor-drive matching. (Source: the China General Machinery Industry Association, 2026-04-23.)

Note on scope. Control valves are not among the five valve types this site screens, and this item is not an endorsement of the maker or of the product. It is recorded for the cryogenic test and the hydrogen-service content.

Where this connects on this site

• Why a duty at this temperature is handed over rather than answered — the site's seat and temperature rules stop the automatic route below −101 °C, and this duty sits far below that line: Soft-Seated vs Metal-Seated Valves: Where the Temperature Line Is
• What a cryogenic valve specification is expected to name, and why a withdrawn standard still appears in specifications: BS 6364: Withdrawn in 2015 — What a Cryogenic Valve Specification Should Name Instead
• The selector: industrialvalveselect.com

Sources

Note on sourcing. This item originates as an industry-association report of a developer's test result. We report the stated facts — what the unit is, what was measured, and who witnessed it. We do not repeat performance claims beyond those stated, and we do not rank or recommend suppliers.

What the source does not state

The report does not state the valve's nominal size, pressure class, body or seat materials, the number of units, or the test standard applied.

Update note

Append-only. Corrections marked Correction with date.