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The LIANHE Stainless Steel Grooved Coupling is designed to provide a secure and efficient connection for medium- and large-diameter piping systems. Its grooved connection structure supports fast pipeline installation while providing dependable mechanical strength and sealing performance.
Manufactured from mechanically formed stainless steel pipe, the coupling offers good corrosion resistance, dimensional stability, and long-term durability. It is suitable for water supply, gas distribution, heating, cooling, environmental protection, and compatible industrial fluid systems.
Compared with connection methods that require extensive on-site welding, a correctly installed grooved coupling can simplify pipeline assembly, reduce installation time, and make future inspection, maintenance, or replacement more convenient.
Manufactured at our facility in Wenzhou, Zhejiang, China, LIANHE stainless steel grooved couplings are produced under established quality-control procedures to support commercial, residential, industrial, marine, and infrastructure projects.
Product Name: Stainless Steel Grooved Coupling
Size Range: 2"–8" (DN50–DN200)
Wall Thickness: 1.0–5.0 mm
Applicable Standards: GB, EN, DIN, and ASME
Available Materials:
0Cr18Ni9, SS304, S30408, SUS304, and 1.4301
0Cr17Ni12Mo2, SS316, and SUS316
SS304L, S30403, and 1.4306
SS316L, S31603, and 1.4404
Connection Type: Grooved Connection
Nominal Pressure: PN16
Hydrostatic Test Pressure: 2.5 MPa
Airtightness Test Pressure: 1.05 MPa
Applicable Gasket Temperature Range: -20°C to +110°C
Manufacturing Process: Mechanically formed from stainless steel pipes
Surface Treatment Options: Vibration Polishing, Magnetic Polishing, and Pickling
Product Marking: LOGO–OD–W.T.–Material. Customer logos, private brands, batch information, and other customized markings can be applied according to specific order requirements.
Brand: LIANHE
HS Code: 7307230000
Place of Origin: Wenzhou, Zhejiang, China
The actual working pressure and temperature limits depend on the coupling size, wall thickness, stainless steel grade, gasket material, transported medium, groove dimensions, and applicable project standard.
The stainless steel grooved coupling combines corrosion resistance, installation efficiency, mechanical stability, and convenient maintenance.
High mechanical strength and structural stability
Excellent corrosion and oxidation resistance
Good resistance to wear and deformation
Long operating service life under suitable conditions
Stable performance in demanding piping environments
Secure connection between compatible grooved pipe ends
Dependable sealing performance when installed correctly
Streamlined internal structure with limited flow obstruction
Good resistance to vibration and pipeline movement
Suitable for medium- and large-diameter piping systems
Fast and convenient mechanical installation
Reduced requirement for on-site welding
Shorter pipeline installation time
Convenient inspection, maintenance, and replacement
Reduced overall installation and maintenance costs
Suitable for concealed installation where permitted by project requirements
Durable and recyclable stainless steel construction
Corrosion-resistant internal surface
Suitable for compatible drinking-water systems
Reduced risk of secondary contamination under appropriate sanitary conditions
Multiple stainless steel grades and gasket materials available
Correct groove dimensions, gasket selection, pipe alignment, bolt tightening, and installation procedures are essential for reliable performance. Installers should follow the specified installation instructions and use components compatible with the selected coupling.
LIANHE stainless steel grooved couplings can be used with:
Drinking water
Cold water and hot water
Wastewater
Industrial water
Oil and compatible liquid media
Gas and compatible gaseous media
Compatibility should be evaluated according to the stainless steel grade, gasket material, operating temperature, system pressure, and chemical properties of the transported medium.
The stainless steel grooved coupling can be used in a wide variety of piping systems and engineering projects, including:
Water supply and distribution systems
Direct drinking-water pipelines
Gas distribution systems
Wastewater piping systems
Environmental protection pipelines
Steam systems within the confirmed temperature range
Heating networks
Air-conditioning and cooling-water systems
Industrial water pipelines
General compatible fluid-transportation systems
Engineering and infrastructure projects
Ships and marine installations
Commercial buildings
Residential buildings
Hospitals and medical facilities
Hotels and public facilities
Environmental protection equipment
Water-treatment facilities
Industrial processing plants
Heating and air-conditioning projects
Before ordering, customers should confirm the product material, gasket, pressure rating, temperature range, groove standard, pipe outside diameter, and intended medium.
LIANHE applies production and quality-control procedures throughout raw-material inspection, pipe cutting, forming, welding, heat treatment, surface finishing, grooving, pressure testing, marking, and packaging.
Available Certificates:
GB/T 19001-2016
ISO 9001:2015
CE documentation for applicable products
Sanitary License
The actual certificate scope and availability should be confirmed according to the selected product, intended application, and destination market.
Quality-control personnel perform in-process and final inspections. Products are checked before delivery to verify that their materials, dimensions, grooves, surfaces, sealing performance, markings, and packaging comply with the confirmed order requirements.
Inspect the outside diameter, wall thickness, material grade, and surface condition of incoming raw materials.
Check the length, cutting position, and end condition of raw materials after cutting.
Inspect the groove, outside diameter, wall thickness, and other critical dimensions after machining and forming.
Check weld dimensions, weld appearance, and surface quality after welding and forming, where applicable.
Inspect the product surface, dimensions, and grooved connection area after heat treatment.
Verify surface quality after vibration polishing, magnetic polishing, pickling, or other surface treatment.
Perform hydraulic-pressure and airtightness tests according to applicable inspection requirements.
Inspect product markings, quantities, packaging materials, labels, and shipping marks before shipment.
Available testing procedures include:
Hydrostatic Pressure Test
Airtightness Test
Working Pressure Test
Negative-Pressure Test
Pull-Out Test
Cold- and Hot-Water Temperature-Cycling Test
Hydrostatic Bending and Torsion Test
Hydrostatic Vibration Test
Hydrostatic Impact Test
Delivery Inspection: Material grade, surface condition, product dimensions, groove dimensions, hydrostatic performance, airtightness, product markings, quantity, and packaging.
The applicable tests and sampling ratio depend on the selected product, governing standard, intended application, and confirmed inspection plan.
Inspection reports and quality documents can be supplied according to the confirmed product and order requirements, including:
EN 10204 3.1 Material Test Certificate
Raw-Material Inspection Certificate
Radiographic Testing Report, when applicable
Hydraulic Sealing Test Report
Dimensional and Groove Inspection Report
Pressure and Airtightness Test Report
Third-Party Inspection Report
Other project-specific quality documents
Inspection scope, testing ratios, documentation requirements, and third-party witnessing arrangements should be confirmed before production.
Our factory in Wenzhou, Zhejiang, China, is equipped to support the production of standard and customized stainless steel grooved fittings and press fittings.
Principal production equipment includes:
Five automatic pipe-welding production lines
Two laser-cutting machines
Five vibration-polishing machines
Two magnetic-polishing machines
Five airtightness and hydraulic-testing units
Three forming machines
Three grooving machines
Two drilling machines
Ten CNC lathes
Six end-processing machines
Two vertical hydroforming machines
Two frame-type hydroforming machines
Ten pipe-bending machines
Eight automatic argon-arc welding machines
Four hydraulic drawing machines
Four high-speed hydraulic punching machines
Two laser-marking machines
Two packaging units
Other related production and inspection equipment
These production capabilities support material preparation, mechanical forming, grooving, welding, heat treatment, surface finishing, pressure testing, marking, inspection, and export packaging.
Each coupling is protected with a plastic bag to reduce exposure to dust, moisture, and surface contamination. Products are then packed in reinforced export cartons and consolidated in wooden cases when required.
This multilayer packaging helps protect the stainless steel grooved couplings from impact, scratches, contamination, and handling damage during storage and international transportation.
Customized cartons, customer logos, labels, barcodes, pallet packing, and other packaging arrangements can be provided according to confirmed order requirements.
Minimum Order Quantity: Normally 5–10 pieces, depending on the product size and current inventory.
We maintain inventory for many regular products and commonly requested sizes. Selected products may have up to 5,000 pieces available. Because stock levels change continuously, actual quantities and immediate-delivery availability should be reconfirmed when requesting a quotation.
Delivery Time: Regular-size products available from stock can normally be delivered within 3–7 days. Orders requiring new production normally take approximately 25 days.
Quotation Time: Normally within three working hours after receiving complete specifications and quantity requirements.
Quotation Validity: Normally 3–7 days, subject to stainless steel raw-material prices, exchange rates, and current market conditions.
Free Samples: Samples may be provided free of charge for dimensional verification and quality evaluation. International express delivery charges are normally paid by the recipient.
Payment Terms: A 30% T/T deposit is required in advance, with the remaining 70% T/T balance paid before delivery. Specific payment arrangements can be discussed according to the order value and cooperation conditions.
Available payment methods include T/T, Western Union, PayPal, and other mutually agreed methods.
Available Trade Terms: EXW, FOB, CFR, CIF, DDP, and DDU
Products can be delivered by sea freight, air freight, land transportation, or international express service. The shipping method can be selected according to the order quantity, package volume, destination, required delivery schedule, and transportation budget.
Our standard product quality warranty period is one year. If a manufacturing-related quality problem is confirmed during the warranty period, our team will investigate the cause and provide an appropriate technical or after-sales solution.
Customers should provide the product model, order number, groove dimensions, installation conditions, operating pressure, working temperature, transported medium, and relevant photos or videos to assist with technical evaluation.
Manufacturer: LIANHE
Place of Origin: Wenzhou, Zhejiang, China
