Overview
The Worm Gear Operated Wafer Butterfly Valve is a concentric, resilient-seated valve designed for reliable isolation and flow control in water supply, wastewater treatment, HVAC, fire protection, irrigation, and general industrial piping systems.
The valve is installed between two pipeline flanges and uses a worm gearbox to rotate the disc through 90 degrees. Compared with direct lever operation, the gearbox provides increased mechanical advantage, smoother movement, and more controlled opening and closing, making it particularly suitable for larger sizes or applications requiring more stable manual operation.
The resilient rubber seat provides reliable bidirectional sealing under specified operating conditions. Multiple material options are available for the body, disc, stem, and seat, allowing the valve configuration to be selected according to the medium, pressure, temperature, corrosion conditions, and project requirements.
Product Advantages
● Smooth Manual Operation: The worm gearbox reduces the operating effort required, especially for larger valve sizes.
● Reliable Resilient Sealing: The rubber seat provides effective shut-off for compatible media within the specified pressure and temperature range.
● Compact and Lightweight: The wafer body requires less installation space than a double-flanged valve.
● Flexible Material Selection: Different body, disc, stem, and seat combinations are available for water, wastewater, HVAC, seawater, and other compatible services.
● Controlled Opening and Closing: Gear reduction helps avoid rapid manual operation and provides better control of disc movement.
● Simple Installation: The valve is mounted directly between matching pipeline flanges.
● Convenient Maintenance: The simple concentric structure reduces the number of internal components and facilitates routine inspection.
Size Range
● NPS 2\”–40\”
● DN50–DN1000
Larger sizes and special dimensional requirements can be discussed with the factory.
Pressure Rating
● PN10 / PN16
● Class 150
The available pressure rating depends on valve size, body material, seat material, flange standard, and operating temperature.
Material Options
● Body: Ductile iron / CF8 stainless steel / CF8M stainless steel
● Disc: CF8 stainless steel / CF8M stainless steel / C95800 aluminum bronze / Duplex stainless steel
● Stem: Stainless steel 416 / 420 / 431 / 17-4 PH (Type 630)
● Seat: EPDM / NBR / FKM / Silicone Rubber
● Operation: Worm gearbox with handwheel
Material compatibility must be confirmed according to the medium, chloride content, working pressure, operating temperature, flow velocity, and corrosion conditions. Special material combinations are available upon consultation with the factory.
Standards
● Design Standard: API 609 Category A / EN 593 / MSS SP-67
● Inspection and Testing: API 598 / EN 12266-1
● Face-to-Face Dimension: API 609 / EN 558 Series 20
● Flange Compatibility: EN 1092-2 / ASME B16.5 / ASME B16.47, according to valve size and pressure class
● Gearbox Mounting Interface: ISO 5211, where applicable
The applicable standard combination should be confirmed according to the selected size, pressure rating, material, and project specification. Other standards are available upon request.
Industry Applications
● Municipal water supply and distribution
● Wastewater collection and treatment
● HVAC and chilled-water systems
● Fire protection water systems
● Agricultural irrigation
● Water treatment and desalination auxiliary systems
● Power plant cooling-water systems
● General industrial water pipelines
● Seawater and corrosive-water services with suitable material selection
Suitability for seawater, drinking water, oil, gas, chemicals, abrasive media, vacuum service, or elevated temperatures must be confirmed according to the complete valve material configuration and actual operating conditions.
Tianjin Dingliu valve Industry Co., Ltd. is a high-tech enterprise specializing in the valve and automation industry.
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