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Technical overview of Needle Valves including types, specifications, technical details, applications, and price ranges. Also included illustrative pictures for better understanding.

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🔧 What is a Needle Valve?

A needle valve is a precision flow control valve that uses a thin, tapered “needle-like” plunger to gradually open or close a very small orifice, allowing fine control of fluid or gas flow. 

It is mainly used in:

• Instrumentation systems

• Hydraulic & pneumatic lines

• Gas control systems

• High-pressure flow regulation

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📌 Types of Needle Valves (with details & images)

1. Straight Needle Valve

🔹 Specification

• Body type: Inline

• Size range: 1/8" to 1"

• Pressure: Up to 6000 PSI

• Material: SS304 / SS316 / Brass

• End connections: NPT, BSP, compression fittings

🔹 Technical Details

• Simple flow path

• Minimal pressure drop

• High precision throttling

💰 Price Range

• ₹250 – ₹1,500 (India market)

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2. Angle Needle Valve

🔹 Specification

• Body type: 90° angled flow path

• Size: 1/4" to 2"

• Pressure rating: 1500–6000 PSI

• Material: SS316 / Carbon steel

🔹 Technical Details

• Changes flow direction by 90°

• Used where space is limited

• Reduces pipe fittings requirement

💰 Price Range

• ₹800 – ₹3,000

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3. Multi-Turn Precision Needle Valve

🔹 Specification

• Micro-thread stem (fine adjustment)

• Extremely slow opening/closing

• Size: 1/8"–3/4"

• Pressure: Up to 10,000 PSI (special models)

🔹 Technical Details

• High-resolution flow control

• Used in labs & calibration systems

• Long stem travel for micro flow adjustment

💰 Price Range

• ₹1,500 – ₹6,000

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4. High-Pressure Hydraulic Needle Valve

🔹 Specification

• Heavy forged steel body

• Pressure: 6000–10000 PSI

• Temperature: up to 232°C (PTFE seals)

• Seat: metal or soft seat

🔹 Technical Details

• Designed for extreme pressure systems

• Leak-proof sealing (bubble tight)

• Used in oil & gas industry

💰 Price Range

• ₹2,000 – ₹10,000+

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📊 General Technical Specifications (Standard Needle Valve)

Parameter	Value
Size range	1/8" – 2"
Pressure rating	1000 – 10000 PSI
Temperature	-20°C to 230°C (standard)
Material	SS304 / SS316 / Brass / Alloy steel
Seat type	Metal / PTFE / PEEK
Flow type	Linear fine throttling
Connection	NPT / BSP / Socket weld

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⚙️ Working Principle

A needle valve works by:

• Rotating a threaded stem

• Moving a tapered needle into a seat

• Gradually opening/closing flow passage

👉 Small movement = very precise flow change

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💰 Price Summary (India Market)

Type	Price Range
Brass needle valve	₹200 – ₹800
Stainless steel	₹500 – ₹3,000
Angle needle valve	₹800 – ₹3,000
High-pressure type	₹2,000 – ₹10,000+

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🧠 Key Advantages

• Very precise flow control

• High pressure capability

• Compact design

• Leak-tight sealing

• Suitable for instrumentation

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⚠️ Limitations

• Not suitable for high flow rates

• Slow operation (multi-turn)

• Needle tip can wear if over-tightened