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NXF UNS S31603/1.4404/SUS316L OD 1/2-10'' Pressure 3000-9000PSI Needle Valve Stainless Steel 316L Double Ferrule Needle Valve
2026-10-26 17:22 NXF GROUP
1
Products Description
316L Introduction
SAE 316L stainless steel is an austenitic stainless steel and the second most common stainless steel after SAE 304 stainless steel. Its primary alloying constituents after iron are chromium (16–18%), nickel (10–12%), and molybdenum (2–3%). Up to 2% manganese and small (<1%) quantities of silicon, phosphorus, and sulfur are also present. The addition of molybdenum provides greater corrosion resistance than 304, with respect to localized corrosive attack by chlorides, hydrogen embrittlement and to general corrosion by reducing acids, and other acids such as sulfuric acid;[2] while sulfur is added to improve ease-of-tooling/machinability. 316L grade is the low carbon version of 316 stainless steel, which improves relative corrosion-resistance. When cold worked, 316 can produce high yield and tensile strengths similar to duplex stainless steel grades.
It is commonly used in chemical and petrochemical industry, in food processing, pharmaceutical equipment, medical devices, jewellery, luxury watches (especially diver's watches), in potable water piping,[3][4] wastewater treatment,[5] in marine applications[6] and architectural applications near the seashore or in urban areas.[7][8]
It is commonly used in chemical and petrochemical industry, in food processing, pharmaceutical equipment, medical devices, jewellery, luxury watches (especially diver's watches), in potable water piping,[3][4] wastewater treatment,[5] in marine applications[6] and architectural applications near the seashore or in urban areas.[7][8]
316L Double Ferrule Needle Valve Introduction
This 316L Double Ferrule Needle Valve is a high-precision manual needle valve designed for accurate flow regulation and positive shut-off of liquid and gas media in instrument piping systems. It is forged from high-quality 316L stainless steel, delivering outstanding corrosion resistance and stable performance under high-pressure working conditions.
Material performance: 316L stainless steel features low carbon content and molybdenum addition. It offers excellent resistance to general corrosion, pitting corrosion and intergranular corrosion, suitable for corrosive fluids, moisture and high-temperature environments. The whole wetted parts adopt 316L to avoid galvanic corrosion.
Connection structure: It adopts double ferrule compression connection. The front ferrule cuts into the outer wall of the tubing, and the rear ferrule provides supporting force. This structure forms a reliable metal-to-metal seal, easy to install on site without welding, threading or adhesive. It can withstand vibration and pressure fluctuation without leakage.
Operating mechanism: Equipped with a knurled black handwheel. The knurled surface increases friction for comfortable grip and fine adjustment. Rotating the handwheel drives the precision-ground needle stem to lift or lower, so operators can achieve micro flow control or full shut-off steadily. The flow direction marking is clearly stamped on the valve body for correct installation.
Pressure & sealing: The valve body is precision forged and machined. The matched sealing surface of the needle and valve seat is finely lapped to guarantee tight sealing. It is widely used for high-pressure instrument pipelines.
Application: Commonly used in oil & gas, chemical industry, power plants, laboratory gas systems, hydraulic test benches and analytical instrumentation for controlling water, oil, nitrogen, steam and various corrosive media.
Advantages: Compact body size, precise flow adjustment, convenient assembly and disassembly, zero leakage after proper installation, good vibration resistance, long service life and easy maintenance.
316L Double Ferrule Needle Valve Drawing
316L Chemical Composition And Mechanical Properties
Factory and Product Pictures
316L Double Ferrule Needle Valve Product Pictures
316L PMI spectral testing proves
Video of a customer visiting us
Product processing
316L Double Ferrule Needle Valve Product Processing
1.Raw Material Inspection:
Select certified 316L stainless steel round bar as the main blank for valve body. Conduct spectral composition test, hardness sampling check and ultrasonic flaw detection to confirm the alloy content, mechanical performance and internal metallurgical quality. Reject raw materials containing shrinkage cavity, non-metallic inclusion, internal crack and surface defect, and keep all inspection records for batch traceability. Auxiliary spare parts including valve stem, packing, double ferrules, back ferrule and handwheel also go through independent incoming quality inspection before production.
2.CNC Precision Machining:
2.CNC Precision Machining:
Fix the qualified 316L bar stock on CNC lathe and machining center. Complete rough turning and finish turning of the valve body blank, precisely machine the double ferrule connecting threads, internal flow passage, valve cavity and valve seat sealing groove strictly following drawing tolerance requirements. Control the surface roughness of the sealing contact zone to guarantee sealing stability. Machine the valve stem with precise cone sealing tip. Remove chips and perform preliminary deburring after all machining operations.
3.Sealing Surface Lapping & Deburring:
4.Ultrasonic Cleaning & Controlled Assembly:
5.Hydrostatic & Air Tightness Pressure Test:
6.Final Inspection & Packaging:
3.Sealing Surface Lapping & Deburring:
Carry out precision grinding and lapping treatment on the conical sealing surface of valve stem and valve seat with special abrasive paste. The matching lapping ensures close fit of the sealing pair to prevent leakage under high pressure. Clean all internal flow channels, thread grooves and ferrule mounting seats to thoroughly remove micro burrs, metal scraps and lapping residues, avoiding scratches on the ferrule and sealing surface during assembly.
4.Ultrasonic Cleaning & Controlled Assembly:
Put all machined metal components into the ultrasonic cleaning tank with degreasing agent to fully remove cutting fluid, polishing compound and dust. Rinse with purified water and dry with clean hot air. Assemble the front ferrule, back ferrule, valve stem, PTFE packing, gland and knurled handwheel sequentially in a low-dust workstation. Adjust packing compression properly to achieve stem sealing without hindering smooth rotation and adjustment of the handwheel.
5.Hydrostatic & Air Tightness Pressure Test:
Perform shell hydraulic pressure test and seat tightness test according to the rated pressure standard. Pressurize the valve body cavity and hold pressure for the specified duration, inspect leakage at ferrule connections, thread parts and the stem packing area. Check opening and closing flexibility during testing. Rework the leaking or unqualified products. After passing the pressure test, use laser marking to print material mark “316L” and medium flow direction arrow on the valve body surface.
6.Final Inspection & Packaging:
Carry out comprehensive final inspection: check dimension tolerance, thread integrity, lapped sealing surface quality, marking clarity, handwheel operating feel and internal channel cleanliness. Fit thread protective caps on both double ferrule ports to protect threads and sealing cone. Wrap the finished needle valve with anti-corrosion protective film, add desiccant inside the sealed bag, then pack into export cartons or wooden cases for transportation and storage.
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 quality certificate 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 a one-stop service.
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 quality certificate 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 a one-stop service.
Packing & Delivery
Packing
Delivery
Company Profile
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 in1980, XIFEI has been working diligently ever since to embrace the needs of our global customer base.We work to ensure absolute customer satisfaction. Our team has dedicated itself to perfecting our three core components, "Service, Management and 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:
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:
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 quality certificate 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 a one-stop service.
5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA,DDP,DDU；
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A,Credit Card,PayPal;
Language Spoken:English,Chinese,Spanish,Russian
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 quality certificate 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 a one-stop service.
5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA,DDP,DDU；
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A,Credit Card,PayPal;
Language Spoken:English,Chinese,Spanish,Russian
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