Stainless Steel Threaded Unions

DIYE VALVE Stainless steel threaded unions are key detachable fittings in threaded piping systems. Utilizing CNC turning and precision threading processes, and with a professional anti-corrosion treatment, they effectively enhance corrosion and rust resistance, ensuring long-term stable use.

These fittings undergo rigorous quality inspection before leaving the factory, fully complying with international thread and pressure standards, guaranteeing quality. As a professional manufacturer, DIYE VALVE leverages mature production technology and a comprehensive testing system to provide global users with high-quality products that offer consistent performance and stable quality.

Product Features and Advantages:

1. Combines the convenience of threaded connections with the detachability of a union structure, supporting rapid installation and disassembly.

2. Stainless steel valve bodies possess excellent corrosion resistance, rust prevention, and resistance to high and low temperatures.

3. Stainless steel threaded unions are suitable for low-pressure transportation of fluids such as water, gas, and mildly corrosive media.

4. Standard sizes cover DN15–DN100, compatible with mainstream thread standards.

5. We are a trusted supplier for civil, municipal, and light industrial/chemical piping systems.

Technical Parameters

Material Selection and Application

Material selection is determined based on the transported medium, operating environment, and corrosion level; all materials undergo pickling and passivation treatment to enhance corrosion and rust resistance.

1. 304 Stainless Steel (ASTM A351 CF8)

- Common mainstream material, high cost-performance ratio.

- Resistant to corrosion from tap water, gas, weak acids and alkalis, cooling water, and air.

- Suitable for civil water supply and drainage, municipal water supply and drainage, low-pressure gas, central air conditioning condensate pipes, etc.

2. 316 Stainless Steel (ASTM A351 CF8M)

- Molybdenum-containing austenitic stainless steel with excellent resistance to chloride ion corrosion.

- Suitable for applications involving coastal salt spray, seawater desalination, food processing, and mildly corrosive media in light industrial and chemical industries.

- Good weldability; low-temperature resistance up to -70℃.

Applications

DIYE VALVE Stainless steel threaded unions are widely used in civil water supply and drainage systems, municipal water supply and drainage, light industrial and chemical industries, low-pressure gas systems, food and beverage processing, and low-pressure pipelines for coastal engineering and offshore platforms.

Q: How to choose between 304 and 316L stainless steel union , and what are the core differences?

A: The core difference lies in corrosion resistance, and the selection can be made according to actual working conditions: ① 304 stainless steel: a general-purpose type with resistance to weak acids, weak alkalis, tap water and fuel gas, featuring a high cost-performance ratio. It is suitable for conventional scenarios such as civil water supply and drainage, kitchen and bathroom plumbing, and municipal low-pressure pipelines. ② 316L stainless steel: a molybdenum-added upgraded type with resistance to chloride ions, seawater, coastal salt spray and weak corrosive chemical media. It is suitable for working conditions with high corrosion resistance requirements such as coastal areas, food and light industry, and chemical low-pressure pipelines.

Q: What are the quality inspection procedures for DIYE stainless steel threaded union joints, and are inspection reports provided?

A: We implement three strict inspection procedures throughout the whole process to prevent non-conforming products from leaving the factory: ① Raw material inspection: spectral composition analysis of stainless steel materials to ensure the compliance of 304/316L material grades. ② In-process inspection: online detection of thread precision and sealing surface flatness. ③ Finished product inspection: 100% inspection of appearance and dimensions, as well as pressure testing for sealing performance. Material certificates and dimension inspection reports can be provided for each batch, and re-inspection by authoritative third-party institutions is supported.