Check valve– Hy-Lok 700H Series

by Hy-Lok D Vertriebs GmbH

  • 700H series check valve by Hy-Lok Corporation
  • Made of 316/316L stainless steel
  • Suitable for various stationary hydrogen applications
  • EC-79 certified design and materials
  • EPDM O-rings for internal and external seal
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Check valve – Hy-Lok 700H Series

  • The Hy-Lok valves, ball valves, fittings, filters etc. are the result of an ongoing optimisation process, driven by the findings from operation in various industries and laboratories and from innovative research.
  • The Hy-Lok products are manufactured using the latest production techniques with minimum tolerances and hardened surfaces, and meet the highest standards of gas and fluid technology with respect to precision, reliability and safety.
  • The Hy-Lok production process is certified in accordance with ISO 9001. All Hy-Lok products undergo individual quality control, from inspections of the starting materials and after the various production steps, right through to the final acceptance.

Key features

  • Check valve made of high-grade stainless steel type 316/316L
  • Proven quality through extensive test sequences according to (EG) No. 79/2009 and (EU) No. 406/2010:
    • Salt spray test
    • Durability test
    • Hydraulic pressure test
    • Double internal and external leakage test with compressed gaseous hydrogen
  • Non-metallic materials tested according to (EG) No. 79/2009 and (EU) No. 406/2010 for hydrogen compatibility, aging by oxygen and ozone resistance
  • Cracking pressure range available from 1/3 psig to 25 psig
  • EPDM O-ring for body seal against external leakage
  • Poppet with EPDM O-ring for lowest internal leakage
  • Available with Hy-Lok two ferrule tube fitting end connection for precision tubing with 6 mm, 8 mm, 10 mm, 12 mm, 1/4″, 3/8” and 1/2″ outer diameter or NPT female and male thread
  • Applicable for a maximum working pressure of 350 bar (5,076 psig) @21°C
  • Wide temperature range from -40 °C to +85 °C (-40 °F to +185 °F)
  • Internal orifice up to 7.8 mm depending on end connection size
  • Full material traceability due to heat tracing code (HTC) on valve body


  • Wide range of possible hydrogen applications

Contact us

  • Whether your demands are simple or complex, Hy-Lok D finds the right resources for you. Interested? Please contact the vendor directly by filling in the contact vendor form.
Max Pressure (in bar)

Max Ambient Temperature (in °C)

Min Ambient Temperature (in °C)

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      Hy-Lok D Vertriebs GmbH

      Hy-Lok D is competent in fluid systems in every branch of industry. Thanks to decades of cooperation with leading partners from fluid technology and gas supply systems, Hy-Lok D has developed into a dependable, competent and strong partner for various sectors including chemicals and petrochemicals, oil and gas industry, pipeline and plant engineering, power generation, semi-conductor industry and analytics.

      Through ongoing innovation, customized production, further developments and additions to our product portfolio, we offer not only fluid system products of the highest quality but also complete solutions for your system requirements from a single source.

      Whether your demands are simple or complex, Hy-Lok D finds the right resources for you. Creative product designers and experienced local sales engineers work hand-in-hand with short communication routes to create a quick and reliable solution for you. The employees at Hy-Lok D advise you exhaustively on site and are reliably at your disposal.

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