Stainless Steel Groove Coupling For Water And Gas Piping Systems

Designed for demanding fluid control environments, our Stainless Steel Groove Coupling provides a secure, reliable, and leak-free connection for water and gas piping systems. Manufactured in Wenzhou, China, under strict quality management systems, these couplings are engineered to ensure long-term operational stability and reduce maintenance requirements for complex engineering and commercial projects.

Technical Specifications

Our groove couplings are manufactured to precise dimensional and material standards to ensure seamless integration into your existing piping infrastructure.

• Size Range: 2”~8" (DN50~DN200)

• Thickness: 1~5MM

• Standards: GB, EN, DIN, ASME

• Material Grades: 0Cr18Ni9 SS304 S30408 SUS304 1.4301, 0Cr17Ni12Mo2 SS316 S31603 SUS316 1.4404, SS304L S30403 1.4306, SS316L S31603 1.4404

• Connection Mode of Socket End: Groove

• Nominal Pressure: PN16

• Water Pressure Test: 2.5MPa

• Air Tightness Test Pressure: 1.05MPa

• Matching Gasket Applicable Temperature Range: -20℃~110℃

• Process: Pipes - Mechanically formed

• Surface Treatment: Vibration polishing, Magnetic polishing, Pickling

• Product Marking: LOGO-OD-W.T-Material (Custom marking according to customer's requirement is available)

• HS Code: 7307230000

Product Advantages & Applications

Core Advantages

The structural and material design of our stainless steel groove couplings delivers significant value for procurement and installation:

• Durability & Reliability: High resistance strength, exceptional corrosion resistance, wear-resisting properties, and a long service life.

• Operational Efficiency: Low flow resistance and good sealing performance with zero leakage ensure system efficiency.

• Installation & Cost: Easy to install and suitable for embedded installation, which significantly lowers comprehensive project costs.

• Safety & Compliance: Features good seismic performance, environmental protection, health safety, and BABSL compliance.

Wide Application Scenarios

These couplings are highly adaptable and designed to handle various media including drinking water (cold and hot), wastewater, industrial water, oil, and gas. Typical applications include:

• Piping Systems: Water piping, gas piping, direct drinking water, environmental protection, steam, heating, air conditioning, and industrial water piping systems.

• Project Types: Engineering projects, ships, commercial and residential buildings, hospitals, hotels, and environmental protection facilities.

Quality Control & Production Capacity

We maintain a rigorous quality assurance system to minimize procurement risks and ensure every coupling meets international standards. Our brand, LIANHE, holds multiple certifications including GB/T19001-2016, ISO9001:2015, CE, and a Sanitary License.

8-Step Quality Control Process

Our QC personnel remain on the production lines to conduct both online and final inspections. All products are 100% inspected before delivery through the following steps:

1. Raw material outside diameter, thickness, and material inspection.

2. Length and end inspection of raw materials after cutting.

3. Socket, outside diameter, and thickness check after machine processing.

4. Weld size and surface inspection after welding forming.

5. Surface, size, and socket inspection after heat treatment.

6. Surface qualification check after surface treatment.

7. 100% Hydraulic air tightness test.

8. Marking and Packaging inspection.

Comprehensive Testing & Inspection Reports

We perform extensive test items including Hydrostatic test, Airtight test, Pressure test, Negative Pressure test, Drawing Test, Temperature change (cold and hot water cycle) test, Hydrostatic bending and Torsion test, Hydrostatic vibration test, and Hydrostatic impact test. Delivery inspections cover material, surface, size, hydrostatic, and airtight parameters.

Available Factory Inspection Reports and Certificates include: EN 10204/3.1B-MTC, Raw material inspection certificate, 100% Radiography Test Report, Hydraulic seal test report, Thread inspection report, and Third Party Inspection Reports.

Advanced Production Equipment

As a real manufacturer with our own factory in Wenzhou, our strong professional technical team utilizes a comprehensive suite of equipment to ensure top-quality production:

• 5 sets of automatic pipe welding production lines

• 2 laser cutting machines

• 5 vibration machines & 2 magnetic throwing machines

• 5 airtight and hydraulic test equipment

• 3 forming machines & 3 grooving machines

• 2 drilling machines & 10 CNC lathes

• 6 flat opening machines

• 2 vertical water expansion machines & 2 frame water expansion machines

• 10 pipe bending machines & 8 automatic argon arc welding machines

• 4 hydraulic drawing machines & 4 hydraulic high-speed punching machines

• 2 laser typewriters & 2 packaging and other related equipment

Packaging, Shipping & Trade Terms

We leverage our abundance of press fittings production and sales management experience, alongside a special cost control system, to provide favorable pricing and flexible trade conditions.

Packaging Details

Packing Method: Plastic bags + Cartons + Wooden Case to ensure secure transit.

Purchasing & Delivery Information

• MOQ & Inventory: 5~10 PCS. We maintain an inventory of 5000 PCS in stock for each product and size, supporting delivery at any time.

• Delivery Time: 3~7 days for products of regular size; 25 days for new production.

• Quotation Time & Price Validity: Quotations provided within 3 hours. Price validity is 3~7 days, depending on market conditions.

• Free Samples: Samples are available free of charge (express delivery fee is not covered).

• Payment Terms: 30% T/T Advance Payment + 70% T/T Payment Before Delivery (specifics can be discussed). Payments accepted via T/T, Western Union, Paypal, etc.

• Shipping Terms: EXW, FOB, CFR, CIF, DDP, DDU. We provide shipping by sea, by air, and by express.

• After-Sales Service: Our quality warranty period is 1 year. Any quality issues will be resolved to customer satisfaction.

FAQ

1. Can you provide free samples?

Yes, we provide free samples for all new clients to help you evaluate our product quality before making a purchasing decision.

2. Who will cover the shipping cost for the samples?

Generally, the shipping freight for sample delivery needs to be borne by the customer.

3. How do you ensure that the bulk goods will be as good as the samples?

We maintain strict production standards to ensure every batch perfectly matches the approved samples. At Lianhe, we do not do one-off business; we treat all customers as long-term partners by consistently providing reliable products, timely delivery, and competitive pricing.

4. Can you print our brand logo on the surface of the product?

Absolutely. We can customize your exclusive logo on the stainless steel groove couplings based on your specific needs or design drawings, which is a standard part of our dedicated OEM service.

5. Do you offer any discounts for bulk orders?

Discounts are determined based on the purchase quantity. The larger your order volume, the more favorable discounts, free accessories, or customized packaging services we can offer.

6. What is the maximum heat resistance of the gasket?

The gasket used in our groove couplings has a maximum heat resistance of 110℃, ensuring stable performance in demanding environments.

7. What are the applicable media for this product?

These fittings are highly suitable for food-grade media, including drinking water, milk, beverages, beer, and other sanitary fluid piping systems.

8. Have the products undergone annealing treatment?

Yes, all of our stainless steel groove couplings are fully annealed to eliminate internal stress and ensure optimal material durability.

9. What is the service life of the groove fittings?

Under normal operating conditions, the average service life of our grooved fittings is up to 70 years, providing a reliable and long-lasting piping solution.

Lianhe's purpose is "Customer First, Integrity First; Innovation, and Dedicated Service."