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NXF UNS S31603 Stainless Steel 316L 1/2-10'' 3000-9000PSI Compression Straight Double Ferrule Tube Hydraulic Needle Valve
2026-07-09 16:35 NXF GROUP
10
Product Description
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.
316L Hydraulic Needle ValveIntroduce
The hydraulic needle valve, also known as an integral bonnet straight-through needle valve, features a valve body machined from a single piece of bar stock. The inlet and outlet have a 180° straight-through layout, making it a specialized control valve for precision instrument pipelines. The valve body is primarily made of 316 stainless steel, offering excellent resistance to acids and alkalis, and salt spray corrosion. It can withstand pressures up to 6000 PSI and is suitable for both high and low temperature conditions. The product consists of a valve body, regulating stem, packing, gland, and operating handle. The PTFE packing seal provides a stable seal, effectively preventing media leakage.The straight-through flow path ensures smooth media flow with minimal pressure loss. Precise throttling and fluid cut-off are achieved through the precise movement of the conical valve stem, enabling fine-tuning of even small flow rates. It supports various connection methods, including compression fittings and threads, and features a compact structure. Panel mounting is possible, facilitating easy disassembly and maintenance. It is widely used in hydraulic and pneumatic systems, petrochemical industries, laboratory testing, and pressure gauge pipelines, and is suitable for media such as gases, oils, and pure water. Compared to the split valve cover structure, the integrated steel neck design reduces leakage points and provides higher pressure resistance, making it a core component for high-pressure precision pipeline flow control.
316L Hydraulic Needle Valve Drawing
316L Chemical Composition and Mechanical Properties
Factory and Product Pictures
316L Hydraulic Needle ValveProduct Pictures
316L PMI spectral testing proves
Video of a customer visiting us
Product processing
316L Hydraulic Needle Valve Produce 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
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
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.
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 in 1980, 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."
316L Hydraulic Needle ValveCertification
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,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
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,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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