Gun Metal Needle Valve (BS 5154, Heavy-Duty Instrument Service)
Supreme Valves' Gun Metal Needle Valve is manufactured to IS 318 / BS 1400 / BS 5154 standards. It is specifically designed for throttling and isolation in power plants, pulp mills, and chemical lines. Featuring a premium Gun Metal LG2 body with a precision-ground, tapered SS316 needle spindle, providing bubble-tight shut-off for ash slurry water, instrument air, and steam lines.
Key Applications
Industrial Applications & Engineering Problem Solving
The Engineering Challenge
Ash handling plants, boiler blowdown systems, and instrument air lines deal with highly abrasive coal ash fines, entrained particulate matter, and aggressive water chemistry. Standard brass or carbon steel needle valves suffer from rapid seat erosion, cavitation, and stress corrosion cracking (SCC), leading to constant leakage, compromised sensor readings, and frequent plant shutdowns.
The Supreme Valves Engineering Solution
Crafted from Gun Metal LG2 (C83600) copper-lead-tin alloy, this valve offers exceptional resistance to cavitation and erosion. It is coupled with an SS316 precision-ground tapered needle tip that cuts through particulate build-up. The screwed BSP ends are manufactured to tight tolerances per BS 21 to prevent leakage, while the 225-micron FBE coating prevents external atmospheric degradation.
Operational Use Cases & Scenarios
Coal Fly-Ash Slurry Water Throttling
Operational Challenge: Precise flow regulation of high-velocity, highly abrasive ash-carrying water in bottom-ash disposal pipelines.
Engineering Benefit: Gun metal LG2 body offers zero cavitation wear while the hardened SS316 tapered tip prevents flow-by wire drawing.
Chemical Feed Calibration Lines
Operational Challenge: Isolating and fine-tuning chemical digestant additives in high-humidity, high-acid bleaching loops.
Engineering Benefit: Lead-bronze composition resists organic acid corrosion, ensuring stable flow calibration over extended runs.
Technical Specifications
Material of Construction (MOC)
Dimensions & Weights
| Size (NB) | Face-to-Face (L) | Height Open (H) | Handwheel Dia | Body OD | Unit Weight |
|---|---|---|---|---|---|
| 15mm (1/2") | 70 mm | 115 mm | 65 mm | 32 mm | 0.35 kg |
| 40mm (1-1/2") | 120 mm | 175 mm | 100 mm | 60 mm | 1.20 kg |
Purchase Options
Features & Benefits
Premium Gun Metal Body
LG2 grade copper-tin-lead alloy body offers superior cavitation and corrosion protection in ash-slurry water.
SS316 Precision Needle
SS316 spindle features a finely tapered tip for progressive, precise flow regulation and long seat life.
BSP Screwed Ends
Screwed BSP threads are manufactured precisely to BS 21 / IS 554 for leak-free instrument piping connections.
High DFT Protection
Finished in sky blue epoxy coating with 225 microns DFT, preventing atmospheric degradation in heavy-duty plants.
Frequently Asked Questions
Q What is Gun Metal LG2 C83600?
LG2 is a high-grade Lead Bronze (often called Red Brass in the USA) containing 85% Copper, 5% Tin, 5% Lead, and 5% Zinc. It offers exceptional casting quality, pressure tightness, and strong corrosion resistance.
Q Why is SS316 used for the spindle?
Ash handling plants transport highly abrasive particles. SS316 provides the necessary hardness and erosion resistance to withstand the high-velocity flow of slurry.
Q Can this needle valve be used for steam?
Yes, up to 100°C with standard PTFE packing, and higher with graphitic braided packing. It is ideal for auxiliary steam lines and condensate drains.