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Control Valves

Axial On-Off Valve - RZD-X

Mokveld Valves BV

  • Axial flow design
  • Streamlined full-port expanded body
  • Low pressure loss
  • Pressure-balanced trim
  • Excellent sealing (bi-directional, class VI)
  • Compact one-piece body (15–60% lighter vs ball/gate valves)
  • Certified fire-safe

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Description Vendor

The RZD X Axial On-Off Valve is an advanced valve designed for special applications, featuring a balanced piston mechanism. It offers a streamlined flow path through a full-port expanded body, which minimizes turbulence and prevents erosion and vibration, thereby reducing process downtime and maintenance costs. The valve is compact, with a one-piece body that provides a 15% to 60% weight reduction compared to ball or gate valves, making it especially efficient when combined with spring-opposed actuators. It ensures low pressure loss due to its high capacity, which reduces operating costs for pumps and compressors. The valve is fire-safe, with seals secured inside the body to resist external heat sources, and is certified for fire safety. It is pressure-balanced, allowing it to be opened against full differential pressure without damaging the seal, eliminating the need for bypass valve equalization. The valve is suitable for quick-acting on-off applications such as HIPPS and ESD, severe-duty on-off, flow line and header on-off, and critical isolation, start-up, and blow-down. It also offers excellent sealing, with a self-energizing system that ensures reliable bi-directional and bubble-tight shut-off (class VI). The valve supports a wide range of actuators, including pneumatic, hydraulic, electric, and electro-hydraulic options, and is ideal for infrequent use due to its consistent operating forces and lack of sticking. It is also certified for low fugitive emissions (tightness class B) and is custom-designed for specific applications.

Use Cases

  • Quick-acting on-off (HIPPS, ESD)
  • Severe-duty on-off (upstream)
  • Flow line and header on-off
  • Critical isolation, start-up and blow-down

Capabilities

  • Available in sizes 2”–72”.
  • Rated ASME Class 150–2500 or API 3000–10 000.
  • Pressure-balanced design allowing opening against full differential pressure.
  • Very fast stroke time: 20” Class 1500 in less than 2 seconds.
  • Optional low fugitive emission (ISO 15848-1 Tightness class B).
  • Fire-safe certified construction.
  • Suitable for infrequent use (no sticking over time).
  • Compatible with pneumatic, hydraulic, electric and electro-hydraulic actuators.
  • Custom-designed per application.
Mokveld Valves BV Mokveld Valves BV, a Dutch global leader in the development and production of high-quality control and safety valves with a distinguished history dating to 1922, has supplied the first valves for hydrogen applications over 30 years ago, with the company's axial control valves, on-off valves, and check valves currently operating in various H2 applications worldwide. Mokveld announced a long-term frame agreement with Gasunie (the Dutch gas network operator) to supply control valves for Hynetwork's Hydrogen Delivery Stations, part of Gasunie's plans to develop a countrywide hydrogen network in the Netherlands converting existing natural gas pipelines to transport hydrogen, with Mokveld's axial control valves (featuring one-piece body design, streamlined flow path, and high capacity) selected for their pressure-balanced trim and full surround flow enabling energy-efficient electric actuator use. The company's Zero Emission Valve (ZEV-R model), designed to eliminate fugitive emissions and hydrogen-ready, represents a world-first innovation alongside axial check valves (TKZ-Y), axial on/off valves (RZD-X), and axial control valves (RZD-R) offering low fugitive emission tightness class B conformance (ISO 15848-1), fire-safe design, and reliable bi-directional bubble-tight shut-off suitable for hydrogen service. As an active member of CEN TC 69 Working Group 19 (developing European standards for valves and hydrogen), and with the majority of Mokveld's delivered valves conforming to NACE MR0175/ISO 15156 (facilitating conversion of existing natural gas valve applications to hydrogen service), Mokveld continues providing expert engineering assistance for both new hydrogen applications and natural-gas-to-hydrogen service conversions, supporting the safe and efficient European hydrogen network transition alongside its established oil and gas, hydropower, water infrastructure, and carbon capture valve technology business.
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