Pipe flanges are indispensable connecting components in industrial piping systems, widely used to connect, seal, and disassemble pipes, valves, pumps, and mechanical equipment. Different flange types feature unique structural designs and performance advantages, tailored for diverse pressure, temperature, and engineering working conditions. Selecting the right flange is critical to the safety, stability, and service life of the entire pipeline project.

Common Pipe Flange Types and Core Applications

Industrial pipe flanges are classified by structure, connection mode and usage scenario. The most mainstream types and their professional applications are as follows:

1. Weld Neck Flange (WN Flange)

With a long tapered hub for seamless butt welding with pipes, this flange features uniform stress distribution, high structural strength and excellent pressure resistance. It is the preferred choice forhigh-pressure, high-temperature and critical pipeline projects, widely applied in oil & gas transmission, petrochemical plants, power generation, and marine engineering systems.

2. Slip On Flange (SO Flange)

Designed for easy sleeving and fillet welding on pipe ends, slip on flanges are cost-effective and simple to install and align. They are ideal for medium and low-pressure conventional piping systems, such as water supply, drainage, general industrial circulation pipelines, and building piping projects.

3. Blind Flange (BL Flange)

As a solid plate-type flange without a central hole, it is used to block and seal pipe ends, isolate pipeline sections, or reserve interfaces for later maintenance and testing. It is commonly used in pressure testing, pipeline shutdown isolation, and equipment port sealing for chemical and energy projects.

4. Threaded / Screwed Flange

Featuring internal or external thread connection without welding operation, this flange is suitable for environments where on-site welding is prohibited, such as flammable, explosive and high-cleanliness working spaces. It is widely used in low-pressure gas pipelines, fire protection systems and small-bore industrial piping.

5. Socket Weld Flange

Designed for small-bore pipelines, it adopts socket insertion and local welding connection, with good rigidity and sealing performance. It is mainly used for small-diameter, medium and high-pressure process pipelines in chemical, pharmaceutical and instrument piping systems.

6. Lap Joint Flange

Matched with stub ends for movable assembly, it is easy to disassemble and adjust alignment, perfect for pipelines requiring frequent inspection, maintenance and replacement. It is widely used in corrosion-resistant alloy piping and long-term circulating industrial systems.

Reliable Flange & Pipe Fitting Supplier – Cangzhou Yunxinda International Trade Co., Ltd.

Cangzhou Yunxinda International Trade Co., Ltd. (Hebei Yunxinda) is a professional manufacturer and exporter dedicated to full-series pipe flanges and industrial pipe fittings in Cangzhou, Hebei, China. Rooted in China’s pipeline equipment manufacturing base, the company integrates production, processing and foreign trade sales, providing one-stop piping solution services for global customers.

Our core product lineup covers all mainstream flange types mentioned above, including weld neck, slip on, blind, threaded, socket weld, lap joint and reducing flanges. Meanwhile, we support complete supporting pipe fittings, such as elbows, tees, reducers, pipe caps, crosses and other butt-welded pipeline accessories. All products are available in carbon steel, stainless steel and alloy steel materials, strictly manufactured in accordance with international authoritative standards including ASME B16.5, ASME B16.9, DIN, EN, JIS and GB.

Our flanges and pipe fittings are widely applicable to petroleum, natural gas, petrochemical, electric power, water treatment, urban construction, marine engineering and other fields. We support standard mass production and customized processing according to customer drawings and technical parameters. With strict quality inspection, stable product quality, standardized export packaging and flexible delivery cycles, we have won long-term trust from customers in Europe, America, the Middle East, Southeast Asia and other regions.

Adhering to the business philosophy ofQuality Oriented, Customer First, Win-Win Cooperation, Cangzhou Yunxinda International Trade Co., Ltd. always focuses on providing high-quality, cost-effective industrial pipeline equipment and professional after-sales service. We sincerely welcome global buyers, engineering contractors and distributors to consult and establish long-term stable cooperative partnerships.