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Hydrogen Pressure Reducing Valves

Pressure Reducing Valve DM 652 ATEX H2

Mankenberg GmbH

  • Pressure reducing valve for ex atmospheres and medium to high flow rates
  • Self-acting pressure reducers with accurate control and easy installation/maintenance
  • Diaphragm-controlled spring-loaded and balanced proportional control valve
  • Manufactured from deep-drawn stainless steel with excellent corrosion resistance
  • Soft seal on valve cone

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Description Vendor

The Pressure reducing valve DM 652 ATEX H2 is a self-acting pressure reducer designed for use in explosive atmospheres (ATEX) and suitable for medium to high flow rates. It is a diaphragm-controlled, spring-loaded, and balanced proportional control valve, constructed from deep-drawn stainless steel for excellent corrosion resistance. The valve cone is fitted with a soft seal, and the spring module, comprising spring cap, spring, adjusting screw, diaphragm, and internal components, is connected to the valve body via a clamp ring and two bolts. This design allows for easy replacement of the diaphragm or spring assembly without special tools. The valve operates by balancing the outlet pressure against the force of the valve spring, adjusting the outlet pressure through the adjusting screw. It is compliant with ATEX directive 2014/34/EU and DIN EN ISO 80079-36, featuring a leakage line connection, adjusting screw seal and lock, potential equalization, protected body connections, and a grounding lug. The valve is suitable for liquids, gases, and steam, with a temperature range of -10°C to 130°C and a nominal pressure of 40 bar. It offers various Kvs values and setting ranges, and is available in different materials and configurations to suit various applications.

Use Cases

  • Typically used in hydrogen and related industrial applications.

Capabilities

  • Reduces inlet pressure up to 40 bar to a controlled outlet pressure within defined setting ranges (0.1–12 bar).
  • Operates without pneumatic or electrical actuation (self-acting).
  • Suitable for liquids, gases, and steam within the specified temperature and pressure limits.
  • Designed for use in explosive atmospheres in accordance with ATEX 2014/34/EU.
  • Supports DN 15–50 with Kvs values from 5 to 22 m³/h (depending on size).
Mankenberg GmbH Mankenberg GmbH, founded in 1885 by Gustav Mankenberg and headquartered in Lubeck, Germany with 185 employees (end of 2024), is a manufacturer of self-acting control valves for pressure and level control, focusing on standard products alongside customized solutions for demanding industrial applications, and has developed products specifically supporting hydrogen production via PEM electrolysis. The company's ATEX-compliant hydrogen pressure regulators, including the DM 555 (spring-loaded proportional control valve for small/medium flow rates, stainless steel 316L body and wetted parts), DM 652 (diaphragm-controlled, spring-loaded, and balanced proportional control valve for medium/large flow rates), and UV 5.1/UV 3.5 back pressure regulators/pressure sustaining valves, are manufactured entirely of high-quality stainless steel via deep-drawing processes for lightweight, compact, corrosion-resistant construction meeting DIN EN 60534-4 and ANSI FCI 70-2 leakage classification standards. Mankenberg's ATEX marking (Ex II 2G Ex h IIB+H2 85 degrees C) certifies suitability for use in explosive hydrogen atmospheres, with the company's self-acting valve technology featuring compact design, pressure resistance, and high corrosion resistance particularly suited to PEM electrolysis (protone exchange membrane electrolysis, considered to have the greatest potential among current hydrogen production processes) applications requiring precise pressure control without pneumatic or electrical control elements. As green hydrogen breaks down water into hydrogen and oxygen via electrolysis using electrical voltage and becomes increasingly important for electricity, heat, and energy storage as a flexible energy carrier, Mankenberg continues supplying specifically-developed self-acting control valve products supporting the growing hydrogen production infrastructure market.
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