HDRX-R Series
Stable hydrogen delivery from 350–500 bar storage, configured to your fuel cell’s required inlet pressure and peak flow.
Send us your fuel-cell model or datasheet. Our engineering team will propose the correct outlet pressure, flow configuration, interfaces, price and lead time.
Shipping today: original HDRX‑R450 450‑bar drone regulator line · configured platform: quotations open · qualification units planned 2027 Q2
Configured for fuel cells from manufacturers including Intelligent Energy, H3 Dynamics, Spectronik and Honeywell, and other compact PEM fuel-cell systems. Manufacturer names identify compatibility targets from public datasheets — no affiliation or endorsement implied.
A two-stage pressure regulator matched to the fuel cell’s inlet window (typically 0.2–1 barg) and peak flow, rated for the cylinder’s 350–500 bar supply. Single-stage units drift as the cylinder empties; a two-stage design reduces pressure in two steps, so the second stage works from a near-constant intermediate pressure and the outlet barely notices the cylinder emptying. MEYER configures the HDRX-R to the exact stack, verified to the ordered outlet and flow before shipment — request a configured quotation.
A high-pressure hydrogen cylinder can begin a mission at 350–500 bar and finish at a small fraction of that. At the same time, hydrogen demand changes through take-off, climb, cruise and power transients. The regulator must hold the fuel-cell inlet inside its permitted window despite falling cylinder pressure, changing hydrogen flow, temperature variation and rapid load changes — which is why the HDRX-R uses a two-stage architecture: the second stage works from a near-constant intermediate pressure, so the outlet barely notices the cylinder emptying.
Swipe sideways for the full schematic →
The HDRX-R is built around a configurable regulator platform: the pressure class, outlet setpoint, flow capacity and interfaces are defined for your specific fuel-cell system. You do not select from a generic industrial list — MEYER reviews the application and issues a controlled regulator configuration with its own part number.
Designed to limit outlet-pressure variation as cylinder pressure falls during operation — held to ±0.1 bar of setpoint as standard.
Outlet pressure and flow capacity are selected against the actual fuel-cell requirements, from its current manufacturer datasheet.
Designed for direct installation on MEYER and other M18 × 1.5 cylinder interfaces — no high-pressure interstage plumbing.
Wetted materials and sealing components selected for compatibility with high-pressure gaseous hydrogen service.
| Parameter | HDRX-R specification | Status |
|---|---|---|
| Gas | Gaseous hydrogen · helium and other media on review | Configurable |
| Supply pressure | 350 / 400 / 450 / 500 bar classes | Configurable |
| Outlet pressure | 0.2 – 10 barg, set at order · held to ±0.1 bar | Configurable |
| Regulation architecture | Two-stage | Design fixed |
| Flow | Configured to nominal and peak stack demand (SLPM) | Configurable |
| Mass | Approx. 245 g | Design target |
| Envelope | Ø 65 mm | Design target |
| Cylinder connection | M18 × 1.5 · 17E, 25E, 3/4″-16 UNF, 5/8″-18 UNF, M12×1 options | Standard |
| Outlet connection | M8 × 1.25 · customer-selected interfaces on request | Configurable |
| Wetted body material | 316 / 316L stainless steel | Design fixed |
| Mounting | Direct cylinder mount · remote mounting on review | Configurable |
| Documentation | Configuration record (PDF), series datasheet | Standard |
Legend: Configurable set per order · Design fixed platform architecture · Design target pre-production value, confirmed at qualification · Standard included. Final specification depends on outlet pressure, flow, temperature and interface configuration — MEYER issues a controlled specification for each quoted regulator.
Select your fuel-cell system — or state your own numbers. MEYER reviews the pressure and flow requirements before issuing a quotation; compatibility is confirmed by engineering review, not by the form.
Gas service · fuel cell (16 fitted stacks or your own numbers) · supply pressure · an 8-port map with COPV boss threads up to space-grade AS5202 / MS33649 · mounting with target mass from 125 g. The configurator compiles your part number and configuration record live; submitting requests a configured quotation — engineering reply within 2 business days, no payment. Your configuration record arrives as a PDF together with the series datasheet.
Swipe sideways for the full table →
| Fuel cell | Power | H₂ inlet (datasheet) | Fitted flow | Your regulator | |
|---|---|---|---|---|---|
| IE-SOAR 650W (legacy) Intelligent Energy | 650 W | 0.5 ± 0.25 bar | 10 SLPM fitted, sized | HDRX-R350… | Fit to my FC → |
| IE-SOAR 800W Gen2 Intelligent Energy | 800 W | 0.9 ± 0.1 bar.g | 15 SLPM fitted, sized | HDRX-R350… | Fit to my FC → |
| IE-SOAR 1.2kW (legacy) Intelligent Energy | 1.2 kW | 0.5 ± 0.25 bar | 18 SLPM fitted, sized | HDRX-R350… | Fit to my FC → |
| IE-SOAR 2.4kW Intelligent Energy | 2.4 kW | 0.9 ± 0.1 bar.g | 50 SLPM fitted, datasheet peak | HDRX-R350… | Fit to my FC → |
| Aerostak A-250 H3 Dynamics / HES | 250 W | 0.6 – 0.8 bar | 5 SLPM fitted, datasheet | HDRX-R350… | Fit to my FC → |
| Aerostak A-500 H3 Dynamics / HES | 500 W | 0.6 – 0.8 bar | 8 SLPM fitted, datasheet | HDRX-R350… | Fit to my FC → |
| Aerostak A-800 H3 Dynamics / HES | 800 W | 0.6 – 0.8 bar | 12 SLPM fitted, datasheet | HDRX-R350… | Fit to my FC → |
| Aerostak A-1000 H3 Dynamics / HES | 1 kW | 0.6 – 0.8 bar | 17 SLPM fitted, datasheet | HDRX-R350… | Fit to my FC → |
| Aerostak A-1500 H3 Dynamics / HES | 1.5 kW | 0.6 – 0.8 bar | 26 SLPM fitted, datasheet | HDRX-R350… | Fit to my FC → |
| Aerostak A-2000 H3 Dynamics / HES | 2 kW | 0.6 – 0.8 bar | 30 SLPM fitted, sized | HDRX-R350… | Fit to my FC → |
| Protium-300 Spectronik | 300 W | 0.4 – 0.7 bar | 5 SLPM fitted, datasheet | HDRX-R350… | Fit to my FC → |
| Protium-1000 Spectronik | 1 kW | 0.7 bar (10 psig) | 16 SLPM fitted, datasheet | HDRX-R350… | Fit to my FC → |
| Protium-2500 Spectronik | 2.5 kW | 0.7 bar (10 psig) | 40 SLPM fitted, datasheet | HDRX-R350… | Fit to my FC → |
| Protium-3000 Spectronik | 3 kW | 0.7 bar (10 psig) | 48 SLPM fitted, datasheet | HDRX-R350… | Fit to my FC → |
| 600U / 600U-HV Honeywell | 600 W | 12 – 18 psi (≈0.8–1.2 barg) | 10 SLPM fitted, sized | HDRX-R350… | Fit to my FC → |
| 1200U Honeywell | 1.2 kW | 12 – 18 psi (≈0.8–1.2 barg) | 19 SLPM fitted, sized | HDRX-R350… | Fit to my FC → |
Bundled fuel-cell regulators typically stop at 350 bar supply and ≤1 barg outlet — the HDRX-R series covers 350–500 bar supply and 0.2–10 barg outlet, set to order and held to ±0.1 bar as standard. Inlet figures quoted from the manufacturers' public datasheets; trademarks belong to their respective owners — no affiliation or endorsement implied; verify against your fuel cell's manual revision. Fuel cell not listed? Choose “custom” in the configurator above or tell us.
Datasheet lands in your inbox within a minute.
MEYER supplies the regulator alone or as part of a matched COPV + regulator system. Sourcing storage and regulation from one supplier removes interface uncertainty and simplifies pressure-class selection, cylinder-valve compatibility, mounting design, system mass estimation, filling architecture, leak testing, documentation — and supplier responsibility.
For programmes with an existing approved hydrogen cylinder. Configured regulator, controlled specification and installation instructions.
Matched MEYER COPV (hydrogen catalog), cylinder interface, HDRX-R regulator, selected ports and fittings, combined system documentation.
For prototype and research programmes: COPV + regulator, fill adapter, selected connections, operating instructions and engineering support.
Ask for a complete system proposal in the configurator notes, or state it in your quotation request — the configurator's COPV line adds the cylinder to your part-number configuration.
Each configured regulator carries a unique part number tied to its approved pressure, flow, connection and testing requirements. Further engineering documentation is scoped per programme at quotation.
| Two-stage platform architecture | Defined |
| Supply-pressure classes (350–500 bar) | Defined |
| Fuel-cell fitted-configuration engineering | Active |
| Configuration quotations | Open now |
| Qualification units | Planned 2027 Q2 |
| Series production | Following qualification |
Qualification units are intended for established fuel-cell developers, UAV OEMs and engineering programmes able to provide structured integration feedback — apply through the configurator, or state your programme in the quotation notes.
Fuel-cell datasheet review, preliminary regulator configuration, interface recommendation and budgetary quotation.
Configured development regulator with engineering documentation and integration support — for prototype aircraft and laboratory systems.
Configuration control, qualification planning, production documentation and volume pricing — for UAV OEMs and recurring production.
Pricing is provided after application review.
| HDRX-R350 | 350 bar hydrogen regulator — the match for every MEYER catalog hydrogen cylinder, from the 0.5 L HDRX-005-H2 to the 40 L HDRX-400-H2. The standard choice for fuel-cell UAS flying today. Browse the 350 bar cylinders |
| HDRX-R400 | 400 bar hydrogen regulator — headroom for higher-density systems and cylinder configurations operated above catalog pressure under project qualification. |
| HDRX-R450 | 450 bar hydrogen regulator — the class our original drone regulator was built in: R&D programs running reduced-safety-factor cylinder configurations and 450 bar fill infrastructure. |
| HDRX-R500 | 500 bar hydrogen regulator — for 500 bar systems and forward-looking platforms: maximum energy density per cylinder volume. |
The two variables that decide whether a stack sees its specified inlet for the whole flight are droop (outlet change with flow) and supply-pressure effect (outlet change as the cylinder empties). The full argument, illustrated:
Supply-pressure effect, illustrative: a single-stage regulator’s delivery pressure rises as the cylinder empties; two-stage regulation holds the setpoint across the whole flight.
Helium and other lightweight gas applications — airships, aerostats, balloon-launch systems — have their own page: helium regulators. The physics in 60 seconds: why two-stage.
MEYER will propose a regulator configuration matched to your fuel-cell inlet pressure, peak hydrogen flow, cylinder pressure and connection requirements.
You will receive a proposed part number, technical specification, price and estimated lead time after engineering review.