Joints

Introduction to Joints

In industrial piping systems, joints play an essential role in connecting pipe sections and equipment into one complete network. Beyond basic connection functions, joints also help absorb vibration, compensate for installation misalignment, and reduce stress generated during operation. As a result, the system remains more stable, and the risk of damage at high-load connection points is reduced.

As engineering requirements continue to rise, modern joints are designed to solve more than simple connection needs. Their ability to accommodate thermal expansion, reduce noise, and limit corrosion makes them important components in water supply systems, HVAC applications, and industrial piping networks. Selecting the correct joint type and suitable material, therefore, has a direct impact on long-term operating performance.

In this context, Watts joint products offer clear advantages in design quality and manufacturing standards. These products are developed to strict engineering requirements with a focus on stable performance and compatibility across different operating conditions. With a clearly structured product range and application-specific solutions, Watts joints meet the needs of engineers and contractors working on projects that demand high reliability.

Watts Joint Product Line

The Watts joint product range is developed for specific application groups, making it suitable for various installation conditions and operating requirements. Each joint series has its own construction and function, helping solve issues related to vibration, thermal expansion, and overall system stability. Below are some representative models widely used in practical applications.

Series W-XGD1-16

The W-XGD1-16 is a rubber flexible joint developed for piping systems that require effective vibration and noise control. Its multi-layer elastic design helps absorb movement, compensate for misalignment, and reduce stress transferred to the pipeline. The product is suitable for water supply, drainage, ventilation, and water circulation systems. With its flexible construction, the joint supports stable installation under various operating conditions.

Below are the key technical specifications of the W-XGD1-16 series, provided for engineers and contractors during system design and installation:

• Valve size: DN25 – DN600
• Materials:
  • Flanges: Zinc Plated Steel
  • Body: EPDM + Nylon
• Nominal pressure: PN16
• Burst pressure: PN48
• Temperature range: -15°C to 115°C
• Connection standard: GB/T 9119-2000
• Working medium: Water

Series W-LFDEU

The W-LFDEU is a dielectric union developed to protect piping systems from galvanic corrosion. It is installed at connection points between dissimilar metals where stray electrical currents are more likely to occur. The internal insulating structure blocks electrical conductivity, helping reduce pipe damage and corrosion. As a result, the system maintains durability and stable long-term performance.

Below are the key technical specifications of the W-LFDEU series:

• Valve size: DN15 – DN50
• Nominal pressure: PN20
• Temperature range: 0°C to 82°C
• Connection types:
  • NPT thread to ASME B1.20.1
  • BSPT thread to BS EN 10226 (BS21)
• Working medium: Water, non-corrosive liquid

Series W-ZKB

The W-ZKB is a single-bellow rubber expansion joint with a flanged connection, designed to absorb expansion, contraction, and vibration in piping systems. Its elastic construction helps reduce water hammer, limit noise, and protect pipelines from stress generated during operation. The product is suitable for water, oil, and gas systems in industrial plants and infrastructure applications.

Below are the key technical specifications of the W-ZKB series by Watts:

• Valve size: DN32 – DN600
• Materials:
  • Flanges: Galvanized carbon steel
  • Rubber element: EPDM / NBR
• Nominal pressure: PN10 / PN16
• Bursting pressure: PN48
• Temperature range: -20°C to 80°C
• Connection standards: ISO 7005-1, EN 1092-1
• Working medium: Water, oil, gas

Series W-ZKT

The W-ZKT series is a double-bellow rubber expansion joint with a union connection, designed for piping systems that require high flexibility. Its double-bellow structure provides more effective absorption of expansion, contraction, and vibration compared with a single-bellow design. The 360° rotating union ends help compensate for installation misalignment and reduce installation time. This product is suitable for water, oil, and gas systems under various operating conditions.

Below are the key technical specifications of the W-ZKT series:

• Valve size: DN20 – DN80
• Materials:
  • Union nuts: Color galvanized malleable iron
  • Rubber element: EPDM / NBR
• Nominal pressure: PN20
• Temperature range: -25°C to +120°C
• Test standards: ISO 5208-2008, BS EN 12266-2:2002
• Connection standard: ISO 7-1
• Working medium: Water, oil, gas

Series W-ZKT-F

The W-ZKT-F series is a double-bellow rubber expansion joint with flanged connection, developed for large-diameter piping systems that require high movement absorption capability. Its double-bellow structure effectively handles thermal expansion, pressure fluctuation, and vibration during operation. The standard flanged design provides strong stability at fixed installation points. This product is suitable for water, oil, and gas systems in industrial plants and infrastructure projects.

Below are the key technical specifications of the W-ZKT-F series:

• Valve size: DN32 – DN600
• Materials:
  • Flanges: Yellow galvanized carbon steel
  • Rubber element: EPDM / NBR
• Nominal pressure:
  • PN16: DN32 – DN300
  • PN10: DN350 – DN600
• Burstig pressure:
  • PN48: DN32 – DN300
  • PN30: DN350 – DN600
• Temperature range: -15°C to 115°C
• Test standards: ISO 5208-2008, BS EN 12266-2:2002
• Connection standards:
  • ISO 7005-2:1998 PN16
  • BS EN 1092-2:1997 PN16
• Working medium: Water, oil, gas

Series RGS/RGF

The RGS/RGF series consists of stainless steel flexible metal hoses designed to compensate for installation misalignment, absorb vibration, and reduce noise in piping systems. The corrugated stainless steel hose provides high flexibility while maintaining stable pressure and temperature resistance. The RGS series uses threaded connections and is suitable for smaller pipe sizes, while the RGF series uses flanged connections for larger pipelines and more demanding technical applications. These products are widely used in water, oil & gas, chemical, power, and food industries.

Below are the key technical specifications of the RGS / RGF series:

• Valve size:
  • RGS: DN20 – DN50
  • RGF: DN40 – DN600
• Materials:
  • Bellows body: Stainless steel 304
  • Flange: Carbon steel or stainless steel (optional)
• Nominal pressure: PN16
• Temperature range: -20°C to 180°C
• Connection standards:
  • RGS: Male thread to ISO 7-1
  • RGF: GB flanged to GB/T 9113
• Working medium: Water, oil, gas

Watts Joints – Exclusively Distributed by Toan Cau

In Vietnam, Toan Cau Building Materials Co., Ltd. is the exclusive distributor of Watts joint products. With many years of experience in construction materials and modern industrial equipment, Toan Cau ensures genuine products, complete CO/CQ documentation, and clear technical information. The company’s technical team works closely with engineers and contractors to help select the most suitable solution for each piping system.

In addition to joints, Toan Cau also supplies a full range of Watts industrial valves, such as safety valves, check valves, automatic control valves, backflow preventers, and many other flow control products. This integrated product portfolio helps customers build consistent systems that are easier to design, install, and maintain. For detailed consultation or a fast quotation, please contact the hotline 0911 771 551 for prompt support.