Hydronic Metering Station | 9407 Series | FNPT x MNPT | DZR Brass

The RWV 9407 Metering Station is a compact, high-precision flow metering valve designed for hydronic systems requiring accurate measurement in tight spaces. Made from durable DZR Brass (UNS C35330), this station integrates a Venturi insert for enhanced flow accuracy and reduced pressure drop. Compliant with BS7350 standards and rated to 300 WOG, it is ideal for both heating and chilled water applications.

Available in multiple NPT threaded sizes, the 9407 is suitable for a wide range of flow rates—from ultra-low microzones to large circuit applications. Integrated high/low pressure test points (with EPDM Perox gaskets) enable accurate differential pressure readings for flow calculation.

? Key Features:

• DZR Brass Body & Venturi Insert: Corrosion-resistant and lead-free construction ensures long-term reliability and BAA compliance.
• Venturi Technology for Precise Flow: Internally machined Venturi insert provides consistent Cv values and minimizes headloss.
• Threaded NPT Connections: ASME B1.20.1 F/M threaded ends make installation simple in new builds or retrofit systems.
• Wide Operating Temperature Range: Performs in conditions from 15°F to 260°F, including water with antifreeze or anti-boil additives.
• Tight Cv Tolerance (±3%): Precision-tested to meet flow accuracy as per BS7350.

? Installation Guidelines:

• Must be installed on a pipe with the same nominal size.
• Requires 5× pipe diameters of straight length before and after the station (10× if near a pump).
• Minimum 2× pipe diameters of straight length after a balancing valve for optimal flow reading.

⚠️ Safety & Compatibility:

When using a non-RWV manometer, ensure the minimum Δp sensitivity aligns with flow rate requirements. The 9407’s precision makes it ideal for commercial HVAC balancing, low-flow terminal units, and microzone regulation.

Dimension, Weight

Material

¹ Test points with EPDM Perox gaskets and polypropylene ties