Product details
Weiss Needle Valve | 50NVBR | 1/2″ NPT | Brass
Product Description
The 50NVBR is a robust isolation and throttling valve used extensively in mechanical plant rooms. The “50” denotes the 1/2″ NPT connection size, while the “NV” identifies it as a Needle Valve, and “BR” confirms the Brass construction.
In the UAE’s mechanical sector, 1/2″ needle valves are preferred for main pump headers and industrial equipment where a standard ball valve may not provide sufficient control. The needle-point stem allows for very precise “metering” of the fluid flow, which is essential for protecting gauges from sudden pressure surges or for fine-tuning system pressure. The 1/2″ NPT size offers a heavy-duty physical connection, making it suitable for larger industrial pressure gauges and high-vibration environments in Dubai and Abu Dhabi.
Key Features
- Precision Throttling: The tapered needle stem provides excellent control, allowing operators to slowly open the line to prevent “fluid hammer” from damaging the pressure gauge.
- Heavy-Duty Brass Body: Offers superior durability and corrosion resistance in freshwater, chilled water, and compressed air systems.
- Metal-to-Metal Seat: Designed for a secure, leak-proof shut-off even in high-pressure applications.
- 1/2″ NPT Connections: Standard industrial sizing (typically Female x Female) for seamless integration into main piping manifolds and heavy-duty gauge headers.
- Compact “T” Handle: Provides a secure grip for manual operation, allowing for easy adjustment even in tight mechanical spaces.
Technical Specifications
| Specification | Details |
| Brand | Weiss Instruments |
| Model | 50NVBR |
| Material | Brass |
| Connection Size | 1/2″ NPT (Female x Female) |
| Pressure Rating | Up to 3,000 PSI (Liquid) / 2,000 PSI (Gas) |
| Max Temperature | 200°F (93°C) |
| Stem Material | Stainless Steel or Brass |
| Application | Gauge Isolation / Flow Metering / High-Pressure HVAC |
Frequently Asked Questions
- Q: Why use a needle valve (50NVBR) instead of a ball valve (LH-12)?
- A: A needle valve is designed for “metering” and handles much higher pressures. It allows you to open the pressure to the gauge very slowly, whereas a ball valve is “all or nothing,” which can shock the gauge.
- Q: Is this suitable for high-temperature steam?
- A: While brass is durable, for high-pressure steam service, the Stainless Steel (50NVSS) version is typically recommended due to its higher temperature rating and resistance to steam erosion.
- Q: Can this be used for domestic water?
- A: Yes, it is excellent for domestic water headers. However, check if your specific project in the UAE requires a Lead-Free (LF) certified model for potable water.