Product details
Weiss Needle Valve | 25NVBR | 1/4″ NPT | Brass
Product Description
The 25NVBR is a heavy-duty isolation valve used extensively in mechanical plant rooms and industrial skids. The “25” denotes the standard 1/4″ NPT connection size, the “NV” identifies it as a Needle Valve, and “BR” confirms its Brass construction.
In the UAE’s mechanical sector, 1/4″ needle valves are essential for protecting sensitive pressure gauges. Unlike a ball valve, which opens instantly, the needle valve allows for very gradual “throttling.” This prevents “fluid hammer” or sudden pressure surges from damaging the gauge’s internal Bourdon tube. The 1/4″ NPT size is the most common connection for industrial pressure gauges, making the 25NVBR a universal accessory for Dubai and Abu Dhabi HVAC projects.
Key Features
- Precision Flow Throttling: The tapered needle-point stem allows for extremely fine adjustment, ensuring a smooth pressure application to the instrument.
- Corrosion-Resistant Brass Body: Provides excellent durability in chilled water, hot water, and compressed air environments common in the Middle East.
- Metal-to-Metal Seat: Engineered for a reliable, “bubble-tight” shut-off even in high-pressure industrial applications.
- 1/4″ NPT Standard Connection: Features a Female-to-Female configuration, allowing for direct installation between the process pipe and the pressure gauge.
- High Pressure Rating: Capable of handling significantly higher pressures than standard gauge cocks, making it suitable for booster pumps and high-head headers.
Technical Specifications
| Specification | Details |
| Brand | Weiss Instruments |
| Model | 25NVBR |
| Material | Brass |
| Connection Size | 1/4″ NPT (Female x Female) |
| Pressure Rating | Up to 3,000 PSI (Liquid) / 2,000 PSI (Gas) |
| Max Temperature | 200°F (93°C) |
| Handle Type | “T” Handle (Brass/Steel) |
| Application | Gauge Isolation / Pressure Throttling / HVAC |
Frequently Asked Questions
- Q: Why choose a 1/4″ Needle Valve (25NVBR) over a 1/4″ Ball Valve (LH-14FF)?
- A: The 25NVBR is rated for much higher pressures (up to 3,000 PSI) and allows for a slow, controlled opening. A ball valve is better for quick shut-off, but a needle valve is safer for protecting delicate gauges from sudden shocks.
- Q: Can this be used for steam?
- A: It is rated for 200°F, which is suitable for low-pressure steam. For high-pressure industrial steam, a Stainless Steel (25NVSS) model is typically required.
- Q: Is this suitable for potable (drinking) water?
- A: Yes, brass is widely used in UAE plumbing. However, if your project strictly requires Lead-Free (LF) certified components, you should check for the LF version.