What is a needle valve?
A needle valve is a regulating valve with a conical needle as the closure element. Unlike a ball valve or gate valve, its primary purpose is not isolation but fine-tuning of flow rate. Turning the handwheel moves the needle into or out of the seat. The free cross-section changes continuously. A stainless steel needle valve is particularly suited to high-pressure applications because the material resists corrosion and withstands mechanical stress.
VN217 stainless steel needle valve – technical data
- Nominal size: DN8 to DN50 (1/4" to 2")
- Connection: female thread ISO 7-1 / EN 10226-1 (F-F)
- Body: stainless steel A182 F316
- Needle: stainless steel A182 F6 (martensitic, hardened)
- Stem packing: PTFE + graphite
- Rated pressure: 205 bar / 3000 psi
- Temperature range: −30 °C to +260 °C
- Design: block body, rising stem
- Actuation: handwheel
- Conformity:EU Pressure Equipment Directive 2014/68/EU
A182 F316 provides high resistance to corrosion and pitting in aggressive media. The A182 F6 needle is martensitically hardened and withstands abrasive wear from throttling. The PTFE+graphite packing seals the stem reliably even at elevated temperatures.
Needle valve vs. globe valve vs. ball valve – when to use which?
| Feature | Needle valve | Globe valve | Ball valve |
|---|---|---|---|
| Primary function | fine regulation | shut-off | shut-off (fast) |
| Control precision | very high | medium | low |
| Pressure drop (open) | high | medium | low |
| Actuation | multi-turn | multi-turn | 90° quarter-turn |
| Typical use | metering, sampling, gauge lines | steam, water, piping | on/off, water, gas, oil |
When you need precise flow control, a stainless steel needle valve is the right choice. For pure isolation without regulation we recommend a ball valve or globe valve.
Applications – high pressure, sampling and metering
The stainless steel needle valve suits the chemical and petrochemical industry, oil and gas installations, power plants, laboratory equipment and the food industry. Typical applications are pressure regulation ahead of measuring instruments, process-line sampling, metering of gases and liquids, bypass control around isolating valves and pressure gauge connections. In high-pressure lines up to 205 bar the VN217 block body delivers the required mechanical stability. The A182 F316 stainless steel ensures corrosion resistance even in contact with chlorides, weak acids and caustic solutions.
Needle valve in stock – EU-wide delivery
Fergo stocks all eight sizes of the VN217 needle valve for immediate dispatch. Standard shipping via DHL reaches customers across Europe within a few working days. Each needle valve ships with a works certificate to EN 10204 2.1 and a product datasheet. Higher inspection levels (3.1) are available on request. For larger quantities or bespoke configurations the Fergo team coordinates scheduled deliveries and project pricing. Use our resistance check tool to verify material compatibility with your medium.
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