Hydrogen ball valves — ANSI flanged

Trunnion-mounted, fire-safe API 607, anti-static, ISO 11114-qualified materials. PED category III, ANSI B16.5 Class 150–1500 connections. For refining, ammonia, H2-methane blending, biomethane upgrading and HRS stations. Ribel brand.

ANSI ball valves for hydrogen service

Ball valves are the standard for on/off shutoff in hydrogen lines: reliable sealing, quick operation (90°), low pressure drop, simple maintenance. H2 service however requires dedicated configurations: seats qualified for class A leakage (very small H2 molecules), body in anti-embrittlement materials, certified anti-static device (hydrogen has minimum ignition energy 0.02 mJ — any electrostatic spark can ignite combustion), and fire-safe construction for ATEX environments.

Standard hydrogen plant configurations use ANSI B16.5 flanged connections: Class 150 and 300 for low/medium pressure (blending, upgrading), Class 600 with RTJ gaskets for high pressures, Class 900–1500–2500 for compressed storage and HRS at 350 and 700 bar. Valves are PED category III certified (or IV in the most severe configurations) and supplied with complete technical dossier.

Roffia distributes Ribel H2 ball valves in Italy: forged split body or top entry construction, trunnion-mounted ball, pure PTFE / PEEK / metal-to-metal seats, anti-static as standard, fire-safe API 607.

Technical specifications

Parameter Specification
TypeTrunnion-mounted (split body or top entry), full bore or reduced bore
PED categoryCategory III standard, IV for severe configurations (PED 2014/68/EU — Group 1 fluid)
DNDN 15 – DN 300 (larger sizes on request)
ANSI B16.34 classesClass 150, 300, 600, 900, 1500, 2500
Operating pressureUp to 420 bar (Class 2500) — temperature derating per ASME B16.5
ConnectionsFlanged ANSI B16.5 (RF, RTJ face), BW (butt weld) ASME B16.25, EN 1092-1 on request
Operating temperature−196 °C ÷ +260 °C (PTFE/PEEK), up to +540 °C metal-to-metal
SeatsVirgin PTFE, filled PTFE, PEEK, metal-to-metal (stellite/chromium carbides)
TightnessClass A or AA ISO 5208 (PTFE), class IV–V (metal-to-metal)
SafetyFire-safe API 607 / API 6FA, anti-static BS 5146 / ISO 7121, anti-blowout stem
ActuationManual (lever or gear), pneumatic, electric ATEX if required
DocumentationPED dossier, MTR 3.1/3.2, fire-safe certificate, anti-static, hydrostatic and tightness test

Hydrogen-compatible materials

Material selection for H2 ball valves follows the same anti-embrittlement compatibility criteria as safety valves, but with additional constraints for ball and stem, which undergo cyclic wear and torsional stress.

Component Material H2 service
Body / capF316L (forged), CF8M (cast), Inconel 625 (high pressure)Standard high-pressure H2
BallSolid 316L or hard-chromed, solid Inconel 625 (HRS 700 bar)Compatible
Stem17-4PH (HRC 32 max limit), 316L or Inconel 718HRC 22 hardness limit in H2 + H2S service
SeatsVirgin PTFE, filled PTFE, PEEK, stellite 6 (metal-to-metal)Pure PTFE recommended for cleanliness
Stem packing (gland)Expanded graphite, PTFE V-ring, fire-safe graphiteGraphite for fire-safe API 607
BoltingASTM A193 B7M / B8M (hardness limit for high-pressure H2)Verify NACE MR0175 compliance for sour service

Reference standards

Construction and materials

  • ASME B16.34 — flanged, threaded and welded valves
  • ASME B16.5 — flanges and flanged fittings class 150–2500
  • ASME B16.25 — BW ends for welding
  • API 6D — pipeline and gas pipeline valves
  • ISO 11114-1/-4 — material compatibility with gases (hydrogen)
  • NACE MR0175 / ISO 15156 — material hardness for H2/H2S service
  • ANSI/CGA G-5.6 — hydrogen piping systems

Safety and testing

  • API 607 (8th ed.) — fire-safe for soft-seated valves
  • API 6FA / ISO 10497 — heavy-duty fire-safe
  • BS 5146-1 / ISO 7121 — anti-static
  • ISO 5208 — seat tightness classes (leakage rate)
  • API 598 — workshop tightness tests
  • PED 2014/68/EU — pressure equipment directive
  • ATEX 2014/34/EU — accessories in explosive atmospheres
  • ISO 19880-3 — valves for hydrogen HRS stations

Brand: Ribel

Ribel manufactures trunnion-mounted ball valves in forged split body and top entry configuration, qualified for H2 service with ISO 11114-certified materials, PTFE/PEEK/metal-to-metal seats, fire-safe API 607 as standard, BS 5146 anti-static. The range covers DN 15–300, ANSI Class 150–1500, with Class 2500 availability for HRS 700 bar applications on request.

Roffia srl distributes Ribel valves with free engineering sizing, complete PED dossier, MTR 3.1/3.2, individual fire-safe and anti-static certificates, and competitive lead times thanks to the Cremona warehouse.

Manufacturer official catalog: ribelvalvole.it — see also the Ribel page on Roffia.com.

Related hydrogen components

Hydrogen safety valves →

PED category IV, free EN ISO 4126 sizing, anti-embrittlement materials, Ribel brand.

RTJ ring-type-joint flanges →

Single and double Ring Type Joint, ANSI B16.5 up to Class 2500. Standard for high-pressure H2.

ANSI flanges for hydrogen →

B16.5 and B16.47 in H2-compatible materials, Class 150–2500, complete MTR 3.1/3.2.

Klinger hydrogen gaskets →

Spiral wound, RTJ, pure PTFE and graphite, qualified for H2 service per ISO 11114.

Go to the sector pillar

See a complete overview of Roffia components for hydrogen plants: applications, technical challenges, standards and all dedicated products.

Hydrogen sector — complete overview

Domande frequenti

Which ball valves are suitable for high-pressure hydrogen service?
For high-pressure H2, trunnion-mounted ball valves are used with split body or top entry construction, fire-safe seats in pure PTFE, PEEK or metal-to-metal, certified anti-static device and ISO 11114-qualified materials. Standard configurations use AISI 316L body, F316L forged or Inconel 625 for high pressures, 316L coated or solid Inconel ball, anti-blowout stem. PED category III certification is required for H2 (Group 1) above the directive's PS·DN thresholds. Ribel hydrogen ball valves cover DN 15–300, ANSI Class 150–1500, with full PED dossier and MTR 3.1/3.2. Pure PTFE seats are recommended up to ~200 °C, metal-to-metal seats for cryogenic or high-temperature applications.
What does PED category III mean for an H2 ball valve?
Category III of the PED 2014/68/EU directive applies to valves on piping with Group 1 fluids (hydrogen included) when the PS·DN product exceeds the threshold values in table 7 of the directive. In category III the valve requires: design per a harmonized standard or equivalent, verification and CE marking by a Notified Body, conformity assessment module (B+D, B+F, G or H1), EU declaration of conformity with NB number, material MTRs, individual hydrostatic test certificate (≥ 1.5 × PS), seat tightness test and body tightness test. For ANSI Class 600 or higher trunnion ball valves in high-pressure H2 service, category IV may apply in the most severe configurations — Roffia indicates the appropriate category and dossier based on design data.
Which ANSI classes are recommended for hydrogen?
The choice of ANSI B16.34 class depends on operating pressure and temperature: Class 150 (PN ~20 bar at ambient T) for low-pressure H2, blending in natural gas networks, biomethane upgrading. Class 300 (PN ~50 bar) for chemical and medium-pressure refining. Class 600 (PN ~100 bar) standard for many industrial H2 applications — this is where RTJ gaskets become common. Class 900 (PN ~150 bar) and Class 1500 (PN ~250 bar) for H2 storage, compression and HRS (Hydrogen Refueling Stations) at 350 bar. Class 2500 (PN ~420 bar) for HRS 700 bar service and special applications. Effective rating must always be derated based on temperature per ASME B16.5 table, also considering the body material.
Pure PTFE or metal-to-metal seats for hydrogen ball valves?
Seat selection is critical for H2 service tightness: Pure (virgin) PTFE guarantees soft sealing leakage class A or AA per ISO 5208, optimal up to ~200 °C and ANSI classes up to 600. It is the standard choice for H2 plants at ambient temperature. Filled PTFE (glass, carbon, MoS2) extends life in cyclic service but may slightly reduce tightness — acceptable for industrial applications. PEEK operates up to 260 °C, wear-resistant, recommended for frequent cycling and blowdown valves. Metal-to-metal seats (stellite 6, chromium carbides, tungsten carbide) are mandatory for: cryogenic temperatures (liquid H2 at −253 °C), high temperatures (>260 °C), fire-safe API 607/608 service in classified zones. Metal-to-metal sealing is leakage class IV or V per ISO 5208 — less tight than PTFE but indestructible in fire. Ribel valves are available in all configurations with traceable material MTRs.
Is fire-safe certification required for H2 ball valves?
Yes, in any hydrogen installation classified as a hazardous ATEX area (Zone 0, 1 or 2) ball valves must be fire-safe certified per API 607 (eighth edition, soft seated) or API 6FA/ISO 10497 (heavy-duty valves). The fire-safe test verifies that, after exposure to external flame at 750 °C for 30 minutes, the valve maintains: internal tightness within acceptable limits (maximum allowable leakage), external tightness to atmosphere, operability (must be closeable after the fire). Fire-safe construction includes: secondary metal-to-metal seats activated after PTFE damage, graphite stem packing, anti-static device between ball, stem and body. All Ribel H2 ball valves are fire-safe API 607 with individual test certificate; on request we also supply API 6FA valves for severe Oil & Gas service with H2S co-presence.
Anti-static sealing: what does the standard require for H2 valves?
Hydrogen has a minimum ignition energy of just 0.02 mJ — the lowest of any industrial gas. An electrostatic spark generated by friction between ball, stem and body during operation can ignite combustion. Therefore H2 valves require an anti-static device certified per BS 5146-1 and ISO 7121: a series of springs and contacts in stainless steel or nickel-base alloys that ensure electrical continuity between ball, stem and body, with measured resistance < 10 Ω. The body itself must be earthed to the plant. All Ribel valves for hazardous gas service are anti-static as standard with individual continuity test documented on the test certificate.
Does Roffia offer free sizing for H2 ball valves?
Yes, the Roffia technical service performs free of charge: size and ANSI class selection based on flow rate, pressure, temperature and allowable pressure drop, material selection per ISO 11114 and ANSI/CGA G-5.6, seat definition (PTFE/PEEK/metal-to-metal) based on service, actuator sizing pneumatic or electric if required, compliance verification with applicable standards (PED, ATEX, ISO 19880 for HRS). We provide complete technical offer with valve drawing, datasheet, construction material, certifications, and lead times. To request sizing simply fill the form on the quote page with process data.

Hydrogen ball valve selection and supply

Send us process data (pressure, temperature, fluid, cycle frequency, ATEX environment) and required ANSI class. We perform technical selection, actuator sizing and supply a Ribel valve complete with PED dossier, fire-safe and anti-static certificate.

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