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NXF UNS S31603 ASTM 316L/EN 1.4404 Size 1/2-10'' Pressure 3000-9000PSI Stainless Steel Double Ferrule Needle Valve
2026-08-17 18:04 NXF GROUP
3
316L Introduce
Grade 316 is the standard molybdenum-bearing grade, second in importance to 304 amongst the austenitic stainless steels. The molybdenum gives 316 better overall corrosion resistant properties than Grade 304, particularly higher resistance to pitting and crevice corrosion in chloride environments.Grade 316L, the low carbon version of 316 and is immune from sensitization (grain boundary carbide precipitation). Thus it is extensively used in heavy gauge welded components (over about 6mm). There is commonly no appreciable price difference between 316 and 316L stainless steel.
The austenitic structure also gives these grades excellent toughness, even down to cryogenic temperatures.Compared to chromium-nickel austenitic stainless steels, 316L stainless steel offers higher creep, stress to rupture and tensile strength at elevated temperatures.
The austenitic structure also gives these grades excellent toughness, even down to cryogenic temperatures.Compared to chromium-nickel austenitic stainless steels, 316L stainless steel offers higher creep, stress to rupture and tensile strength at elevated temperatures.
316L Needle Valve Introduce
A needle valve is a precision flow control device used to accurately regulate or throttle the flow of liquids or gases. It
features a slender, tapered, needle-like plunger on the end of a threaded screw that fits into a precisely matched seat.How It Works Precise Throttling: As the handle is turned, the screw rotates to slowly lift or lower the "needle". It takes multiple turns of the fine-threaded handle to make a small adjustment to the orifice size, allowing for extremely accurate metering.
Pressure Drop: Because of the extremely small opening, needle valves generally yield low flow rates and a significant drop in pressure from the inlet to the outlet.Bi-Directional Flow: Unlike standard flow control valves (which regulate flow in one
direction and allow free flow in the other), needle valves control flow in both directions. Types of Needle Valves
In-Line vs. Angle: Inline models have straight-through connections, while angle patterns change the direction of the fluid flow by 90 degrees.Materials: Commonly constructed from brass, stainless steel, or specialized plastics (like PFA) depending on whether the mediais water, hydraulic oil, or aggressive chemicals.
features a slender, tapered, needle-like plunger on the end of a threaded screw that fits into a precisely matched seat.How It Works Precise Throttling: As the handle is turned, the screw rotates to slowly lift or lower the "needle". It takes multiple turns of the fine-threaded handle to make a small adjustment to the orifice size, allowing for extremely accurate metering.
Pressure Drop: Because of the extremely small opening, needle valves generally yield low flow rates and a significant drop in pressure from the inlet to the outlet.Bi-Directional Flow: Unlike standard flow control valves (which regulate flow in one
direction and allow free flow in the other), needle valves control flow in both directions. Types of Needle Valves
In-Line vs. Angle: Inline models have straight-through connections, while angle patterns change the direction of the fluid flow by 90 degrees.Materials: Commonly constructed from brass, stainless steel, or specialized plastics (like PFA) depending on whether the mediais water, hydraulic oil, or aggressive chemicals.
316L Needle Valve Drawing
316L Chemical Composition and Mechanical Properties
316L Needle Valve Factory and Product Pictures
316L PMI spectrum test certificate
Customer visit to the factory video
316L Needle Valve Product Processing
1. Material Selection:Common Materials: Valves are typically forged or machined from 316 Stainless Steel, Brass, Carbon Steel, or specialty alloys(e.g.,Monel or Hastelloy) depending on the corrosive environment.Raw Stock: Uses bar stock for smaller valves or hot-forged billets for larger, high-pressure bodies to improve structural strength.
2. Valve Body Processing:Hot/Cold Forging: Metal is heated and compressed into a rough valve body shape. This aligns the metal grain, increasing the body's durability against high pressures.CNC Machining: Using 5-axis CNC machines, the rough body is drilled and bored to create the primary fluid pathways.Threading & Tapping: Threads are precision-cut into the valve bonnet and body to accommodate the stem and handle assembly
3. Needle and Seat Processing:Turning: The tapered, needle-shaped plunger (the plug) is precision-lathed to a highly exact conical angle.Seat Creation: The mating seat is bored at an angle perfectly complementary to the needle.Grinding & Lapping: The needle and seat must create a bubble-tight, metal-to-metal seal. Abrasive lapping compounds are used to
rub the needle and seat together, resulting in perfectly matched, leak-proof surfaces.
4. Surface Treatment:Passivation / Electropolishing: Stainless steel valves undergo acid baths to remove surface contaminants and improve corrosion resistance.Coating: In some high-precision manufacturing processes, the tapered end of the needle may be plated with a softer metal (like tin) to allow it to "seat" perfectly during the initial closure.
5. Assembly and Quality Control:Packing & Gaskets: Internals like PTFE (Teflon) or graphite gland packing are inserted to seal the stem and prevent external fluid or gas leaks.Pressure Testing: Valves are mounted on testing rigs and subjected to high-pressure nitrogen or hydrostatic testing to ensure zero leaks through the seat and the packing
3. Needle and Seat Processing:Turning: The tapered, needle-shaped plunger (the plug) is precision-lathed to a highly exact conical angle.Seat Creation: The mating seat is bored at an angle perfectly complementary to the needle.Grinding & Lapping: The needle and seat must create a bubble-tight, metal-to-metal seal. Abrasive lapping compounds are used to
rub the needle and seat together, resulting in perfectly matched, leak-proof surfaces.
4. Surface Treatment:Passivation / Electropolishing: Stainless steel valves undergo acid baths to remove surface contaminants and improve corrosion resistance.Coating: In some high-precision manufacturing processes, the tapered end of the needle may be plated with a softer metal (like tin) to allow it to "seat" perfectly during the initial closure.
5. Assembly and Quality Control:Packing & Gaskets: Internals like PTFE (Teflon) or graphite gland packing are inserted to seal the stem and prevent external fluid or gas leaks.Pressure Testing: Valves are mounted on testing rigs and subjected to high-pressure nitrogen or hydrostatic testing to ensure zero leaks through the seat and the packing
Our NXF GROUP advantage as follow:
1.Our NXF GROUP have our own factory, and we can control the cost by producing by ourselves. We have a great advantage in price and can give you the lowest price based on best quality.
2.Our NXF GROUP can strictly control the quality. We have production,quality inspection, warehousing and other departments to coordinate and control the quality,Such as PMI and size testing.
3.Our NXF GROUP biggest advantage is 3S service. Small quantity, short time, special materials.
4.Our NXF GROUP have excellent qualitycertificate system and trademark certificate
5.Our NXF GROUP have a comprehensive after-sales service guarantee, such as the transaction guarantee provided by Alibaba International Station, as well as remote technical guidance and services.
6.Our NXF GROUP have a well-established logistics support system that can save you both time and money, providing you with aone-stop service.
3.Our NXF GROUP biggest advantage is 3S service. Small quantity, short time, special materials.
4.Our NXF GROUP have excellent qualitycertificate system and trademark certificate
5.Our NXF GROUP have a comprehensive after-sales service guarantee, such as the transaction guarantee provided by Alibaba International Station, as well as remote technical guidance and services.
6.Our NXF GROUP have a well-established logistics support system that can save you both time and money, providing you with aone-stop service.
Packing & Delivery
New XiFei (SuZhou) Business Co.,Ltd is one of the leading and most respected manufacturers in China. Our products include metals,machinery, containers, construction materials, mechanical products, electrical systems, and medical accessories.Established in 1980, XIFEI has been working diligently ever since to embrace the needs of our global customer base.We work toensure absolute customer satisfaction. Our team has dedicated itself to perfecting our three core components, "Service, Managementand Craftsmanship."
Our advantage:3S Service(Small Quantity/Short Time/Special Material).
Certification
FAQ
1. who are we?
We are based in Jiangsu, China, start from 2021,sell to South Asia(30.00%),Eastern Asia(10.00%),Mid East(10.00%),Eastern
Europe(10.00%),South America(10.00%),Domestic Market(5.00%),North America(5.00%),Northern Europe(5.00%),Central
America(5.00%),Africa(5.00%),Southeast Asia(5.00%). There are total about 101-200 people in our office.
2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;
3.what can you buy from us?
Pipe,Flange,Steel plate,Pipe fittings,Alloy products
4. why should you buy from us not from other suppliers?
Our advantage:3S Service (Small Quantity/Short Time/Special Material) We have our own factories, quality can be controlled
seriously. We Specialize in manufacturing about 21 years. We have professional testing department and testing equipment.
5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA；
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A;
Language Spoken:English,Chinese
6. Are you trading company or manufacturer ?
We are manufacturer.
7. How long is your delivery time?
Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to
quantity.
8. Do you provide samples ? is it free or extra ?
Yes, we could offer the sample for free charge but need pay the cost of freight.
9. What is your terms of payment ?
Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
We are based in Jiangsu, China, start from 2021,sell to South Asia(30.00%),Eastern Asia(10.00%),Mid East(10.00%),Eastern
Europe(10.00%),South America(10.00%),Domestic Market(5.00%),North America(5.00%),Northern Europe(5.00%),Central
America(5.00%),Africa(5.00%),Southeast Asia(5.00%). There are total about 101-200 people in our office.
2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;
3.what can you buy from us?
Pipe,Flange,Steel plate,Pipe fittings,Alloy products
4. why should you buy from us not from other suppliers?
Our advantage:3S Service (Small Quantity/Short Time/Special Material) We have our own factories, quality can be controlled
seriously. We Specialize in manufacturing about 21 years. We have professional testing department and testing equipment.
5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA；
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A;
Language Spoken:English,Chinese
6. Are you trading company or manufacturer ?
We are manufacturer.
7. How long is your delivery time?
Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to
quantity.
8. Do you provide samples ? is it free or extra ?
Yes, we could offer the sample for free charge but need pay the cost of freight.
9. What is your terms of payment ?
Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
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