Valve Body Parts Pneumatic Amplifier M425-2VO-06 Mokveld
Mokveld M425-2VO axial control valve technical specifications natural gas pipeline,Technical Overview of the Mokveld M425-2VO-06 RZD Series Axial Control Valve
Product Details
Mokveld M425-2VO-06 is a heavy-duty axial flow control valve belonging to Mokveld's renowned RZD series, engineered specifically for critical flow control and pressure regulation in high-pressure natural gas transmission pipelines. Manufactured by Mokveld Valves B.V. (Gouda, Netherlands), a global authority in axial-flow valve technology since 1922, this valve is rated at ANSI Class 600 (approximately PN100, maximum allowable working pressure ~15.3 MPa) and is designed for nominal pipe sizes in the NPS 16–18" range.
The valve operates on a fully axial-flow principle: a streamlined, venturi-shaped full-bore body ensures that fluid travels in a straight-through path with no directional change, eliminating turbulence, reducing erosion, and suppressing vibration — a fundamental advantage over conventional globe or angle-style control valves. At the core of its performance is Mokveld's proprietary Total Velocity Management® (TVM®) technology, which intelligently distributes and limits fluid velocity across all internal zones of the valve, effectively preventing cavitation, noise generation, and trim erosion even under severe pressure drop conditions.
The "2VO" trim designation indicates a double-seal, multi-orifice trim configuration with specific valve option modules, offering a rangeability (turndown ratio) of up to 650:1 and stable control capability from 2% to 100% of stroke. The pressure-balanced piston design minimizes actuator force requirements, allowing the use of compact pneumatic or electro-hydraulic actuators. The valve body is manufactured as a single-piece integral unit, reducing weight by 20–70% compared to equivalent globe valves and eliminating potential leak paths at flanged connections.
M425-2VO-06 belongs to the Mokveld RZD series axial flow control valves. Main technical parameter ranges:
| Parameter | Specification Range |
|---|---|
| Size Range | 2" ～ 72" (DN50 ～ DN1800) |
| Pressure Class | ASME 150 ～ 2500 / API 3000 ～ 10000 |
| Class 600 Equivalent | Nominal pressure approx. 10.0 MPa (PN100), working pressure approx. 15.3 MPa |
| Control Accuracy | Precise control from 2% ～ 100% stroke, rangeability 650:1 |
| Typical Media | Natural gas, condensate, CO₂, hydrogen, water, etc. |
| Temperature Range | Depends on material, typically -46°C ～ +250°C |
Core Technical Features
- Axial flow design: Fluid flows axially with symmetric, unobstructed flow path, minimizing turbulence, noise and erosion.
- TVM® Technology (Total Velocity Management): Full velocity management to prevent cavitation and vibration.
- Pressure-balanced piston: Low operating force, allowing compact actuator size.
- Full-bore body: Bore matches pipeline diameter with extremely low pressure drop, suitable upstream of flow metering.
- Low fugitive emission: Meets ISO 15848-1 Class B sealing standard.
- Fire-safe design: Complies with API 607 / ISO 10497 standards.
- Bubble-tight shutoff: Bi-directional bubble-tight shutoff.
