Use
The internal thread the needle valve forging pipe and threaded connections,applicable gas equipment container connected to a pressure gauge measuring supporting gas pipeline.It has a good sealing performance,long service life.
Technical data
型号Model | 公称压力PN(MPa) Nominal pressure | 试验压力Testing Pressure(MPa) | 适用温度℃ Suitable temperature | 适用介质 Suitable medium | ||
壳体Shell | 密封(液) Sealing(Liquid) | 密封(气) Sealing(Gas) | ||||
J13W-16P | 1.6 | 2.4 | 1.76 | 0.6 |
P≤200℃ |
液化石油气、 水、油品等 Liquefied petroleum gas,water,oil,etc |
J13W-40P | 4.0 | 6.0 | 4.4 | 0.6 | ||
J13W-160C | 16.0 | 24.0 | 17.6 | 0.6 |
C≤425℃ | |
J13W-320C | 32.0 | 48.0 | 35.2 | 0.6 | ||
Meterial of main parts
零件名称Part name | 阀杆、阀盖Stem,bonnet | 阀杆、阀瓣Stem,disc | 填料Packing |
J13W-16P,J13W-40P | 铬镍不锈钢 Chrome-nickel stainless steel | 铬镍不锈钢 Chrome-nickel stainless steel |
聚四氟乙烯，柔性石墨 PTFE,Flexible graphite |
J13W-160C,J13W-320C | 优质碳钢 High quality carbon steel | 铬不锈钢 Chromium stainless steel |
Main dimensions and weight
DN (mm) | 管螺纹 Pipe thread |
D0 |
L |
H |
H1 |
d | 重量(kg) Weight |
6 | 1/4" | 60 | 55 | 92 | 102 | 4 | 0.63 |
10 | 3/8" | 60 | 60 | 90 | 100 | 5 | 0.65 |
15 | 1/2" | 65 | 65 | 97 | 107 | 6 | 0.8 |
20 | 3/4" | 80 | 80 | 109 | 121 | 8 | 1.07 |
25 | 1" | 100 | 100 | 122 | 132 | 10 | 1.8 |
32 | 11/4" | 140 | 140 | 180 | 191 | 15 | 5.0 |
40 | 11/2" | 160 | 160 | 200 | 215 | 18 | 7.2 |
Needle Valve: Installation, Maintenance, Quick Guide, and Component Overview
The Needle Valve is a precision control valve designed to regulate the flow of liquids and gases in high-pressure, low-flow, and instrumentation applications. Its tapered needle and finely threaded stem allow for accurate flow adjustments, precise shut-off, and reliable performance. Constructed from stainless steel, brass, or alloy materials, needle valves are widely used in chemical processing, oil and gas, power generation, laboratory systems, and fluid instrumentation.
This guide provides detailed information on installation instructions, maintenance procedures, quick installation tips, and a complete parts list, helping engineers and operators ensure long-term reliability and safety.
Proper installation is crucial for achieving optimal performance and preventing leakage or operational issues.
Pipeline Cleaning: Flush the pipeline to remove debris, dirt, or welding residues.
Compatibility: Ensure the valve material is compatible with the fluid or gas type.
Thread Inspection: Verify that the valve threads and pipeline fittings are clean and undamaged.
Seal Verification: Check the O-rings, packing, and gaskets for integrity.
Align the valve with the flow direction indicated by the arrow on the body.
Connect to the pipeline using flanged, threaded, or welded ends depending on the valve type.
Tighten all connections evenly to avoid distortion.
For valves with an actuator, ensure alignment between the stem and actuator.
Test the valve for leaks by applying low-pressure testing before full operation.
[Pipeline Inlet] ---> [ Needle Valve ] ---> [Pipeline Outlet] |--- Tapered Needle Stem for flow control |--- Adjustable packing for sealing
Regular maintenance ensures long service life, smooth operation, and safety.
Inspect the needle and seat for wear or corrosion.
Check packing and O-rings for leaks and replace as needed.
Lubricate the stem with a compatible, non-reactive lubricant for smooth movement.
Verify actuator or manual handle operation for consistent flow control.
Conduct periodic pressure testing to ensure sealing integrity.
| Problem | Possible Cause | Recommended Solution |
|---|---|---|
| Leakage at seat | Worn or damaged needle | Replace or regrind seat/needle |
| Stem difficult to operate | Corrosion or debris | Clean and lubricate stem |
| Packing leakage | Loose or degraded packing | Re-tighten or replace packing |
| Unstable flow | Improper installation or misalignment | Re-align valve and ensure proper orientation |
For field installations or rapid commissioning, follow this simplified procedure:
Ensure the system is depressurized.
Confirm that the valve and pipeline materials match.
Hand-tighten threaded connections first, then use torque wrench for final tightening.
Open and close the valve slowly to check smooth operation.
Apply a pressure test at 1.5 times working pressure to confirm leak-tightness.
This method minimizes installation errors and reduces downtime during maintenance or replacement.
Understanding the valve’s components aids in maintenance, repair, and ordering replacement parts.
| Component | Function | Material |
|---|---|---|
| Valve Body | Main structure; houses internal components | Stainless steel / Brass / Alloy |
| Needle Stem | Controls fluid flow by moving into/out of seat | Stainless steel |
| Valve Seat | Sealing surface for shut-off | Hardened stainless steel / Alloy |
| Packing | Provides stem sealing to prevent leaks | PTFE / Graphite / Elastomer |
| Bonnet | Protects internal components and supports stem | Stainless steel / Alloy |
| Handle / Actuator | Manual or automated control of stem movement | Stainless steel / Aluminum |
| Lock Nut / Gland | Secures packing in place | Stainless steel / Alloy |
Electric or pneumatic actuator for automated control
Position indicator for monitoring valve opening
Safety locking mechanism for high-pressure systems
Needle valves are widely used in critical applications requiring precision flow control:
Chemical Industry: Metering reagents or additives in precise quantities
Oil & Gas: Flow control in sampling lines, instrumentation, and pipelines
Power Plants: Regulation of fuel or steam flow in control systems
Laboratories: Precise dosing of gases or liquids
Hydraulic Systems: Fine-tuning flow rates in sensitive equipment
Needle valves often operate in high-pressure and hazardous fluid systems, making safety a top priority.
Always depressurize the system before installation or maintenance.
Use PPE such as gloves, goggles, and insulated tools.
Avoid oil/grease contamination for reactive or oxygen service lines.
Follow torque specifications to prevent valve or pipeline damage.
Monitor for leaks or unusual noises during operation.
The Needle Valve is a reliable, high-precision solution for controlling fluid and gas flow in low-flow, high-pressure, and critical applications. By adhering to installation instructions, routine maintenance, and safety guidelines, operators can ensure long service life, precise control, and operational safety.
Its durable construction, versatile materials, and optional automation capabilities make it suitable for industrial, laboratory, and instrumentation applications, providing a dependable choice for engineers and procurement professionals.
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