Female Thread x Butt-Weld Union

As a professional manufacturer of pipe fittings in China, Shenchi presents the Female Thread x Butt-Weld Union—a composite pipeline connector that seamlessly integrates a female-threaded end with a butt-weld end within a single unit.

As a high-performance fitting, the core function of the Female Thread x Butt-Weld Union lies in facilitating the seamless interface between threaded connection systems and welded pipeline systems. The female-threaded end is precision-machined using advanced CNC technology, ensuring precise thread profiles and reliable sealing; it allows for direct connection to external-threaded devices such as valves, faucets, and instrumentation.

The butt-weld end features a pre-machined bevel (chamfer) designed to be fused directly to the pipeline via TIG (argon arc) welding, creating a permanent, leak-proof seal. Constructed from high-quality stainless steel or brass, this union is rated for a working pressure of over 1.6 MPa and operates within a temperature range of -20°C to 120°C. It is widely utilized in new construction projects to connect welded main pipelines with threaded branch lines, as well as in renovation projects to interface welded systems with threaded equipment. With its high-performance capabilities, it offers a simple yet reliable solution for complex pipeline connection challenges.

Product Specifications

Core Structure and Design Highlights

1. Integrated Composite Structure

The Shenchi Female Thread x Butt-Weld Union features an innovative integrated composite structure design, precisely combining the female threaded end and the butt-weld end within a single body. This eliminates the complexity associated with using multiple adapter fittings and significantly reduces potential leak points. The product is formed via a single-step forging process, resulting in a dense material structure and high mechanical strength.

2. Precision Internal Threading

The female threaded end is machined using high-precision CNC equipment; the thread profile is standardized, and the engagement is tight, fully meeting international standards for Female Thread x Butt-Weld Unions. Thread specifications cover BSPP, BSPT, NPT, and metric standards, ensuring perfect compatibility with a wide variety of male-threaded pipe fittings and equipment, both domestic and international.

3. Optimized Butt-Weld End Design

The butt-weld end features a pre-machined standard bevel (chamfer), eliminating the need for secondary on-site preparation during installation. When connected to piping via TIG welding, the weld joint achieves strength equivalent to that of the base material, creating a permanent, integral pipeline system. The pipe wall thickness has been optimized to ensure both welding integrity and ease of handling.

4. Intermediate Union Structure

The product incorporates a detachable intermediate union structure, featuring a precision-threaded connection and a high-quality sealing gasket. This design ensures flexibility during installation while facilitating future maintenance. For inspection or repair, the pipeline can be disconnected simply by loosening the intermediate union, thereby avoiding the need to cut or re-weld the pipe joints. II. Key Component Configuration

The Shenchi Female Thread x Butt-Weld Union consists of the following key components:

Body: Constructed from high-quality 304 stainless steel or brass, precision-forged in a single piece.

Union Nut: Made from high-strength material with an anti-corrosion surface treatment; designed to prevent thread stripping even after repeated assembly and disassembly.

Sealing Gasket: Composed of special rubber resistant to high temperatures and aging; embedded within a recessed groove to ensure automatic sealing.

Female Threaded End: Precision-machined using CNC technology, with various thread standards available for selection.

Installation Guidelines

1. Welded End Installation

Clean the welded end and the pipe bevel. Maintain a concentricity deviation of less than 0.5mm. Perform root pass welding using TIG (GTAW) to ensure full penetration at the weld root; after completing the cap pass, inspect the weld for any porosity or slag inclusions.

2. Female Threaded End Installation

Ensure the surface of the male-threaded pipe fitting is clean. Manually screw the male fitting into the female-threaded end of the union. Use a wrench to tighten it to the specified standard torque; the internal sealing gasket will automatically compress to form a leak-proof seal.

3. Precautions

During installation, prevent heat generated by welding from transferring to the sealing gasket area. Wait for the welded joint to cool down completely before performing any assembly or disassembly operations on the union nut.

Maintenance Guidelines

Regular Inspection: Every six months, check the union joint for any signs of leakage or loose threads.

Gasket Replacement: If the sealing gasket shows signs of aging or wear, simply loosen the union nut to easily replace it.

Thread Maintenance: After prolonged operation, apply a small amount of anti-rust lubricant to the threads.

Welded End Inspection: Check the weld seam for any corrosion or cracks; if issues are detected, perform remedial welding promptly.

System Servicing: When equipment requires disassembly for maintenance, simply loosen the central union nut—there is no need to cut the piping.

Why Choose Shenchi?

1. Strict Quality Control

Comprehensive quality control is implemented throughout the entire process, from raw material sourcing to final inspection. Every finished product undergoes 100% dimensional verification and leak testing before leaving the factory.

2. OEM/ODM Customization Services

We offer customized services for threading, packaging, and product marking. We provide rapid response capabilities for non-standard specifications and special material requirements.

3. Highly Competitive Factory Pricing

As a direct-from-factory supplier, we offer discounted pricing and tiered volume-based incentives.

4. Long-Term, Win-Win Partnerships

We actively seek to establish long-term cooperative relationships with wholesalers, engineering firms, and piping contractors. V. Related Product Recommendations

Our company also manufactures a complementary product within the same series: a union featuring an external thread on one end and a butt-weld connection on the other. One end utilizes an external thread to connect with internally threaded fittings, while the other features a butt-weld configuration. These two products complement each other perfectly, comprehensively addressing connection requirements across both threaded and welded piping systems. We warmly invite both new and existing customers to inquire and place orders.

Conclusion

Choosing the Zhejiang Shenchi Female Thread x Butt-Weld Union—proudly Made in China—means choosing innovative design, reliable performance, and convenient maintenance. We look forward to partnering with wholesalers worldwide to build a brighter future together.