Butterfly Valve

Introduction to Butterfly Valve

Butterfly valves are industrial valves used for shut-off, opening, or flow regulation of liquids and gases in piping systems. Their key characteristics include a simple structure, compact size, and fast operation, making them suitable for a wide range of installation scales. Compared to gate valves or globe valves, butterfly valves require less space, are lighter in weight, and are easier to install, especially in large-diameter pipelines.

In practical applications, butterfly valves are widely used in water supply and drainage systems, wastewater treatment, HVAC, fire protection systems, and various industrial utilities. Depending on the disc design, sealing material, and system requirements, they can function either as on-off valves or as control valves. Thanks to their quick response and minimal moving parts, butterfly valves help reduce pressure loss and improve overall system efficiency.

Watts butterfly valves are developed to meet demanding technical requirements in both residential and industrial systems. The products emphasize precision manufacturing, stable sealing performance, and high mechanical durability under continuous operation. With a wide range of models and multiple options for body materials, disc types, sealing materials, and actuation methods, Watts butterfly valves provide flexible selection for different operating conditions.

Operating Principle of Butterfly Valve

The operating principle of a butterfly valve is based on a quarter-turn (90°) rotation of the disc around a fixed shaft to control the flow through the pipeline. When force is applied to the actuator (lever, handwheel, or automated actuator), torque is transmitted through the stem to the disc. The disc (shaped like a butterfly) rotates within the valve body to vary the flow area.

During operation, the valve functions in the following states:

• Fully Closed (0°): The disc is positioned perpendicular to the flow direction and pressed tightly against the sealing seat. At this point, the fluid is completely blocked and cannot pass through the valve.
• Throttling (15° to 75° opening): The disc is rotated to an intermediate position. The flow rate is controlled depending on the opening angle of the disc. However, it is generally not recommended to keep the valve in this position for extended periods, as continuous flow pressure may cause vibration and accelerate seat wear.
• Fully Open (90°): The disc is aligned parallel to the flow direction, allowing maximum flow through the valve. Even in the fully open position, the disc remains within the flow path, resulting in a certain level of pressure drop.

Watts Butterfly Valve Product Line

Based on stable operating principles and the diverse requirements of different systems, Watts has developed a wide range of butterfly valves with various configurations and technical characteristics. Each model is designed to suit specific operating conditions, including pressure, temperature, media, and control methods. Below are typical Watts butterfly valve products widely used in water systems, HVAC, and industrial applications.

Series W W1111 L/G

The W-W1111 L/G is a wafer-type butterfly valve from Watts, designed for water systems, HVAC, irrigation, and general industrial applications. The valve features a compact structure, allowing direct installation between pipeline flanges, which helps save space and simplifies installation. Its concentric shaft design, combined with an EPDM rubber seat, ensures stable sealing performance during operation. This valve series is highly regarded for its mechanical durability, smooth operation, and reliable performance under continuous working conditions.

Below are the main technical specifications of the W-W1111 L/G butterfly valve:

• Valve size:
  • DN50 – DN150 (-L: Lever operated)
  • DN50 – DN600 (-G: Gear operated with handwheel)
• Body material: Ductile iron QT450-10 with epoxy coating
• Nominal pressure: PN16
• Temperature range: -20°C to 120°C
• Operation type: Concentric butterfly valve, wafer type, manual operation
• Design standard: EN 593
• Connection standard: EN 1092-2
• Working medium: Water
• Certification: WRAS (UK potable water approval)

Series W-W1111-G

The W-W1111-G is a concentric wafer-type butterfly valve installed between flanges, equipped with a handwheel-operated worm gear actuator. It is developed by Watts for large-diameter pipelines. The valve is suitable for municipal water supply systems, industrial water conveyance, and irrigation infrastructure, where stable and precise operation is required. The gearbox mechanism reduces operating torque and enhances safety when handling large valve sizes. Its robust construction, durable materials, and reliable sealing performance ensure long-term operation.

Below are the main technical specifications of the W-W1111-G butterfly valve:

• Valve size: DN700 – DN1200
• Body material: Ductile iron QT450-10
• Nominal pressure: PN16
• Temperature range: -20°C to 120°C
• Operation type: The hand wheel controls the rotation of the sealing disc, opening and closing, and flow rate regulation of the valve.
• Design standard: GB/T 12238-2008
• Connection standard: GB/T 12221-2005
• Working medium: Water

Series W-W1111-EK/ET

The W-W1111-EK/ET is an electrically actuated butterfly valve from Watts, designed for on/off control or flow regulation in piping systems. The valve combines a concentric butterfly valve body with a directly mounted electric actuator, enabling automated operation and precise control. This series is suitable for municipal water supply, industrial and agricultural systems, and water transmission pipelines requiring remote control capability. Its robust design, reliable sealing performance, and high durability make it well-suited for continuous operation.

Below are the main technical specifications of the W-W1111-EK/ET butterfly valve:

• Valve size: DN50 – DN600
• Body material: Ductile iron QT450-10 with epoxy coating
• Nominal pressure: PN25
• Temperature range: -15°C to 120°C
• Design standards: GB/T 13927-2008, EN 593, BS EN 5155 / MSS SP-67
• Connection standard: GB/T 17241.6
• Working medium: Water

Series W-W1124-L/G

The W-W1124-L/G is a concentric wafer-type butterfly valve from Watts, designed for systems requiring higher working pressure than standard applications. The valve features a robust structure, high-pressure resistance, and stable performance during operation. Its optimized disc and sealing design help minimize leakage and ensure long-term sealing reliability. This valve series is suitable for water supply systems, HVAC, irrigation, and industrial applications that require durability and high reliability.

Below are the main technical specifications of the W-W1124-L/G butterfly valve:

• Valve size:
  • DN50 – DN150 (-L: Lever operated)
  • DN50 – DN300 (-G: Gear operated with handwheel)
• Body material: Ductile iron QT450-10
• Nominal pressure: PN25
• Temperature range: -20°C to +120°C
• Design standard: EN 593
• Connection standard: EN 1092-2
• Working medium: Water

Series W-W1124-EK/ET

The W-W1124-EK/ET is an electrically actuated wafer-type butterfly valve from Watts, designed for water systems requiring automatic shut-off/on or precise flow regulation. The valve inherits the robust structure of the W-W1124 series and integrates an electric actuator to enhance automation and operational stability. With a PN25 pressure rating and carefully selected materials, it ensures reliable performance under high-load conditions. This valve is suitable for municipal water supply, industrial and agricultural systems, and large-scale water transmission pipelines.

Below are the main technical specifications of the W-W1124-EK/ET butterfly valve:

• Valve size: DN50 – DN300
• Body material: Epoxy-coated ductile iron
• Nominal pressure: PN25
• Temperature range: -15°C to 120°C
• Design standards: GB/T 13927-2008, EN 593, BS EN 5155 / MSS SP-67
• Connection standard: GB/T 17241.6
• Working medium: Water

Series W-W1911-L/G

The W-W1911-L/G is a lug-type butterfly valve from Watts, designed for piping systems that require secure fixation and flexible installation. Thanks to its threaded lug design, the valve allows disassembly on one side of the pipeline without affecting the entire system, making it ideal for maintenance and partial replacement. The valve features a concentric shaft design, ensuring stable operation and reliable sealing performance during use. The W-W1911-L/G series is commonly applied in water systems, HVAC, irrigation, and standard industrial applications.

Below are the main technical specifications of the W-W1911-L/G butterfly valve:

• Valve size:
  • DN50 – DN150 (-L: Lever operated)
  • DN50 – DN600 (-G: Gear operated with handwheel)
• Body material: Ductile Iron (Epoxy Coating)
• Nominal pressure: PN16
• Temperature range: -20°C to 120°C
• Design standard: EN 593
• Connection standard: EN 1092-2
• Connection type: Lug
• Working medium: Water

Series W-W1911-G

The W-W1911-G is a lug-type butterfly valve with a worm gear handwheel actuator from Watts, specifically designed for large-diameter pipelines. The lug structure provides secure installation within the system and allows disassembly on either side of the pipeline during maintenance without affecting the entire line. The worm gear operator ensures smooth operation and precise control of the disc movement, making it suitable for continuous operating conditions. This valve is commonly used in municipal water supply systems, infrastructure projects, and large-scale industrial applications.

Below are the main technical specifications of the W-W1911-G butterfly valve:

• Valve size: DN700 – DN1200
• Body material: Ductile iron QT450-10
• Nominal pressure: PN16
• Temperature range: -20°C to 120°C
• Connection type: Lug
• Working medium: Water

Series W-W1911-EK/ET

The W-W1911-EK/ET is an electrically actuated lug-type butterfly valve from Watts, designed for systems requiring automatic shut-off/on or stable flow regulation. The valve features a concentric shaft design, and its lug-type body ensures secure installation on the pipeline while allowing convenient maintenance on individual sections. The electric actuator enables remote operation and easy integration into centralized control systems. This valve series is suitable for municipal water supply, industrial systems, infrastructure, and water transmission pipelines.

Below are the main technical specifications of this butterfly valve:

• Valve size: DN50 – DN600
• Body material: Epoxy-coated ductile iron QT450-10
• Nominal pressure: PN16
• Temperature range: -15°C to 120°C
• Connection type: Lug (Single-flange / Lug type)
• Connection standard: GB/T 17241.6
• Working medium: Water

Series W-W1211-L/G

The W-W1211-L/G is a flanged butterfly valve from Watts, designed for piping systems that require secure connections and high operational stability. The flanged connection provides strong mechanical support, reduces vibration, and is well-suited for long-term fixed pipeline installations. The valve features a compact structure, low flow resistance, and stable sealing performance thanks to the EPDM seat. The W-W1211-L/G series is widely used in water supply systems, HVAC, and standard industrial applications.

Below are the main technical specifications of this butterfly valve:

• Valve size:
  • DN50 – DN150 (-L: Lever operated)
  • DN50 – DN600 (-G: Gear operated with handwheel)
• Body material: Ductile iron QT450-10
• Nominal pressure: PN16
• Temperature range: -20°C to 120°C
• Design standard: EN 593
• Connection standard: EN 1092-2
• Connection type: Flanged
• Working medium: Water

Series W-W1211-EK/ET

The W-W1211-EK/ET is a concentric flanged butterfly valve with electric actuation from Watts, designed for systems requiring automatic shut-off/on or precise flow regulation. The valve features a double-flanged connection, ensuring secure pipeline integration and stable long-term operation. The electric actuator allows seamless integration into centralized control systems, making it suitable for projects with high automation requirements. This valve series is widely used in municipal water supply, industrial and agricultural systems, as well as water transmission pipelines.

Below are the main technical specifications of the W-W1211-EK/ET butterfly valve:

• Valve size: DN50 – DN600
• Body material: Epoxy-coated ductile iron QT450-10
• Nominal pressure: PN16
• Temperature range: -15°C to 120°C
• Connection standard: GB/T 17241.6
• Connection type: Double flange
• Working medium: Water

Series W-W1224-L/G

The W-W1224-L/G is a high-pressure flanged butterfly valve from Watts, designed for systems requiring secure connections and stable performance under heavy-duty operating conditions. The double-flanged connection provides strong mechanical support, minimizes vibration, and is suitable for long-term fixed pipeline installations. The valve features a concentric design with a rotating disc, ensuring smooth operation and reliable sealing performance. The W-W1224-L/G series is commonly used in water supply systems, HVAC, irrigation, and industrial applications with higher-than-standard pressure requirements.

Below are the main technical specifications of the W-W1224-L/G butterfly valve:

• Valve size:
  • DN50 – DN150 (-L: Lever operated)
  • DN50 – DN300 (-G: Gear operated with handwheel)
• Body material: Ductile iron QT450-10
• Nominal pressure: PN25
• Temperature range: -20°C to 120°C
• Design standard: EN 593
• Connection standard: EN 1092-2
• Connection type: Flanged
• Working medium: Water

Series ZSDF7-Q-XXX-16

The ZSDF7-Q-XXX-16 is a concentric wafer-type butterfly valve with lever operation from Watts, designed for systems requiring stable shut-off and flow control. The valve features a compact structure, lightweight operation, and easy installation between pipeline flanges. Its pinless and lugless design improves sealing performance and reduces wear during operation. This valve is commonly used in water supply, drainage, and fire protection systems in both residential and industrial applications.

Below are the main technical specifications of the ZSDF7-Q-XXX-16 butterfly valve:

• Valve size: DN50 – DN150
• Body material: Epoxy-coated ductile iron QT450-10
• Nominal pressure: PN16
• Temperature range: -20°C to 120°C
• Design standard: EN 593
• Connection standard: EN 1092-2
• Connection type: Wafer
• Working medium: Water

Series ZSXDF7-Q-XXX-16

The ZSXDF7-Q-XXX-16 is a wafer-type signal butterfly valve from Watts, designed for systems requiring monitoring of the valve’s open/close status during operation. The valve is equipped with a signal switch that transmits status feedback to the control panel, making it suitable for water supply, drainage, and fire protection systems. Its compact structure, stable operation, and reliable sealing performance ensure consistent performance in continuous operation. A structure with no pin and no backrest ensures a more reliable sealing effect

Below are the main technical specifications of the ZSXDF7-Q-XXX-16 butterfly valve:

• Valve size: DN50 – DN250
• Body material: Epoxy-coated ductile iron QT450-10
• Nominal pressure: PN16
• Temperature range: -20°C to 120°C
• Test standard: GB/T 5135.6-2018
• Connection type: Wafer
• Working medium: Water

Series W-WGR11-L/G

W-WGR11-L/G is a PN16 grooved butterfly valve with lever operation from Watts, designed for piping systems that require fast installation and high flexibility. The grooved-end connection reduces installation time and allows convenient disassembly and maintenance during operation. The valve features a robust structure, with an optimized disc and seat design to ensure stable sealing performance. W-WGR11-L/G series is particularly suitable for clean water, wastewater, HVAC systems, and light industrial applications.

Below are the main technical specifications of the W-WGR11-L/G butterfly valve:

• Valve size:
  • DN80 – DN150 (-L: Lever operated)
  • DN80 – DN200 (-G: Gear operated with handwheel)
• Body material: Ductile iron
• Nominal pressure: PN16
• Temperature range: -20°C to 120°C
• Design standard: ATS 5200.012-2005
• Connection standard: ANSI/AWWA C606-06
• Connection type: Grooved end
• Working medium: 
  • Non-corrosive liquids
  • Maximum 30% glycol/water mix
• Approvals: WaterMark (License No. WMK26060)

Series W7000

The W7000 is a stainless steel butterfly valve from Watts, designed for systems requiring high cleanliness, excellent corrosion resistance, and stable operation. The valve is constructed entirely from stainless steel, making it suitable for liquid cooling applications, light industrial use, and environments with strict hygiene requirements. Its compact design and low operating torque allow smooth and precise operation. The W7000 supports multiple connection types, including welded and clamp connections, providing flexibility during installation.

Below are the main technical specifications of the W7000 stainless steel butterfly valve:

• Valve size: DN15 – DN200
• Body material: Stainless steel
• Nominal pressure: PN10
• Temperature range: -10°C to 100°C
• Connection standards:
• Welded type: DIN 11850 / ISO 2037
• Clamp type: DIN 32676 / ISO 2852
• Working media: Water, ethylene glycol mixtures ≤ 50%
• Approvals: WaterMark (License No. WMK26060)

Toan Cau – Exclusive Distributor of Watts Butterfly Valves in Vietnam

Watts butterfly valves stand out for their consistent quality, durable design, and ability to meet diverse requirements across water systems, HVAC, and industrial applications. In Vietnam, Toan Cau Building Materials Co., Ltd. (TCBM) is the exclusive distributor of Watts products, ensuring genuine supply along with accurate technical consultation.

In addition to butterfly valves, Toan Cau (TCBM) provides a full range of other Watts industrial valves, offering comprehensive solutions for water systems, HVAC, fire protection, and industrial applications. The product portfolio includes gate valves, butterfly valves, globe valves, check valves, automated control valves, pressure reducing valves, and various specialized valve types. This integrated supply approach enables Toan Cau to support customers in selecting suitable solutions for each application, ensuring technical compatibility, operational efficiency, and long-term system reliability.

With over 18 years of experience in delivering advanced building material solutions, Toan Cau continues to support customers across projects of all scales. For assistance in selecting suitable Watts valve products or to receive a prompt quotation, please contact the hotline: 0911 771 551.