The worm gear flange butterfly valve features a worm gear drive and flange connection design. Opening and closing are achieved through a rotating disc-shaped butterfly plate, with an opening and closing angle of 0°-90°. The streamlined structure of the butterfly plate reduces fluid resistance, and the valve stem undergoes a through-rod heat treatment to improve wear resistance. The sealing surface is made of rubber or plastic to meet low-pressure sealing requirements.
It is characterized by its small size, light weight, and easy operation, and is compatible with various connection methods such as flanges and wafers. It is suitable for large-diameter pipelines and reduces media residue, making it particularly suitable for controlling slurry-like fluids. Sealing types are available in two categories: elastic (nitrile rubber) and metal (stainless steel composite flexible graphite). The vertical plate structure results in a smaller pressure drop when fully open, which is beneficial for flow regulation.
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Worm Gear Flange Butterfly Valve Structure and Working Principle
Structural Composition:
Soft Seal: Nitrile butadiene rubber (NBR, -40℃～90℃), ethylene propylene diene monomer (EPDM, -40℃～120℃), or polytetrafluoroethylene (PTFE, -20℃～200℃). Excellent sealing performance, but limited temperature resistance.
Metal Hard Seal: Stainless steel, cobalt-based alloys, and other metal materials. High temperature resistance (up to 815℃), wear resistance, and long service life, but slightly inferior sealing performance compared to soft seals.
Triple Eccentric Structure: Reduces friction through the cam effect, achieving zero-leakage sealing. Resistant to high pressure and high temperature (≤600℃).
Worn Gear: Sector gear structure, directly connected to the valve stem, transmitting torque.
Worm: Helical drive shaft, drives the worm gear through rotation, amplifying torque (transmission ratio 15:1-60:1), significantly reducing operating torque.
Bearings and Seals: Support the valve stem and worm gear shaft, reducing friction; O-rings or packing seals are used to prevent media leakage.
Valve Body: Cylindrical channel design with flanges at both ends connecting to the pipeline. Materials include gray cast iron, ductile iron, and stainless steel, adaptable to different operating conditions.
Butterfly Plate: Disc-shaped opening and closing element, rotating 0°-90° around the valve stem axis to achieve flow regulation and shut-off. Streamlined design reduces fluid resistance and significantly improves energy efficiency.
Worm Gear Drive Mechanism:
Sealing Structure:
Working Principle:
Turning the handwheel rotates the worm gear, driving the worm wheel sector gear, which in turn drives the valve stem to rotate 90°, opening and closing the butterfly plate.
The worm gear drive mechanism amplifies the handwheel torque by 5-60 times, significantly reducing the opening and closing torque, especially suitable for large-diameter (DN200 and above) or high-pressure valves.
The helix angle design of the worm gear allows the valve to self-lock in any position, preventing the medium pressure from pushing the valve plate to open and close automatically.
Worm Gear Flange Butterfly Valve Technical Advantages and Performance Characteristics
Effort-Saving Operation:
The worm gear drive mechanism amplifies the handwheel torque, reducing the operating torque. For example, the opening and closing time of a DN800 valve can be reduced from 30 minutes to 15 minutes.
Suitable for scenarios with high switching frequency and high internal pressure, such as fire protection systems and petrochemical pipelines.
Sealing Performance:
Soft Seal: Zero leakage, suitable for applications with high sealing requirements such as gas and drinking water.
Metal Hard Seal: Resistant to high temperature and pressure, suitable for harsh conditions such as steam and slurry.
Triple Eccentric Structure: Achieves zero-leakage sealing, resistant to high pressure and high temperature.
Low Flow Resistance:
The thickness of the butterfly plate results in low flow resistance, with a flow resistance coefficient ≤0.3, reducing system energy consumption.
Flexible Installation:
The flange connection structure is compact and lightweight (DN300 valve weighs only about 80kg, flange-connected valves about 120kg), facilitating transportation and installation.
Easy Maintenance:
Simple structure, few parts, easy disassembly and maintenance, seals can be replaced online, reducing maintenance costs.
Long Life Design:
The bearing lubrication system and anti-corrosion coating extend the service life to over 20 years.
Worm Gear Flange Butterfly Valve Applications
Metallurgical Industry:
Regulation and cutoff of media such as blast furnace gas and converter gas; high temperature resistance (≤425℃) and wear resistance.
Power Industry:
Flow control in systems such as boiler feedwater and steam pipelines; high pressure resistance (≤42.0MPa) and high temperature resistance.
Petrochemical Industry:
Media transportation in units such as catalytic cracking and hydrocracking; corrosion resistance (e.g., sulfur-containing media) and erosion resistance.
Water Supply and Drainage Systems:
Flow regulation in systems such as urban water supply and sewage treatment; soft-seal structure achieves zero leakage.
Municipal Construction:
Cutoff and regulation of systems such as gas pipelines and heating pipelines; adaptable to large diameter (DN50-DN2000) requirements.
Worm Gear Flange Butterfly Valve factory
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