PVC butterfly valve is a type of butterfly valve made of polyvinyl chloride (PVC) material. It is mainly used for fluid control in low-pressure and medium pressure pipeline systems, and has been widely used in fields such as chemical industry, water supply, sewage treatment, and construction due to its characteristics of corrosion resistance, light weight, and low cost. The following is a detailed introduction to PVC butterfly valves and their application areas.
The structure and working principle of PVC butterfly valves
structure
Valve body: Made of PVC material, lightweight and corrosion-resistant.
Butterfly plate: usually made of PVC or other corrosion-resistant materials, located at the center of the valve body, rotating to control the flow of fluid.
Valve stem: connects the butterfly plate and actuator, transmitting operating torque.
Sealing ring: usually made of elastic materials such as EPDM, NBR, or FPM to ensure sealing performance.
Actuator: can be manual (handle operated), electric or pneumatic, used to control the rotation of the butterfly plate.
working principle
Butterfly valves control the flow of fluid by rotating the butterfly plate. The rotation angle of the butterfly plate is usually 90 degrees, from fully open to fully closed. When the butterfly plate is parallel to the direction of the fluid, the valve is in an open state and the fluid can pass through; When the butterfly plate is perpendicular to the direction of the fluid, the valve is in a closed state and the fluid is blocked.
The main characteristics of PVC butterfly valves
Corrosion resistance:
PVC material has excellent chemical corrosion resistance and is suitable for acidic, alkaline, and other corrosive media.
Lightweight:
PVC butterfly valves are lighter than metal valves, easier to install and maintain, and are particularly suitable for systems that require frequent operation and maintenance.
Low cost:
Low production cost, suitable for large-scale applications.
Easy to operate:
90 degree rotation for opening and closing, simple operation, flexible selection of manual, electric, and pneumatic driving modes.
Good sealing performance:
Using elastic sealing rings to ensure good sealing performance and prevent leakage.
Application fields of PVC butterfly valves
Chemical industry:
Used for transporting and controlling corrosive chemical media, such as acid, alkali, salt solutions, etc.
Water treatment and supply system:
Used for fluid control in municipal water supply, sewage treatment, and industrial water systems.
Food and Beverage Industry:
PVC butterfly valves that meet hygiene standards are used for conveying and handling food and beverage media.
Buildings and HVAC systems:
Used for cold and hot water pipeline systems, air conditioning systems, and fire protection systems inside buildings.
Swimming pool and water facilities:
The corrosion-resistant PVC butterfly valve is suitable for water treatment systems in facilities such as swimming pools and water parks.
Agricultural irrigation:
Lightweight and durable PVC butterfly valves are used for water flow control in agricultural irrigation systems.
Maintenance and operation precautions
Regular inspections:
Regularly inspect the sealing and operational performance of the valve, and replace worn or damaged components in a timely manner.
Pay attention to checking the condition of the sealing ring to prevent aging and damage.
Cleaning and maintenance:
Regularly clean the inside of the valve to prevent medium deposition and blockage.
Ensure that the system is completely depressurized and cleaned during maintenance and repair.
Operating procedures:
Operators must strictly follow the procedures to operate the butterfly valve, avoiding excessive or rapid force.
Conduct operational training to ensure that operators understand the performance and operating methods of butterfly valves.
Lubrication:
For components that require lubrication, use suitable lubricants to ensure flexible operation.
Summary
PVC butterfly valves have been widely used in various industries due to their excellent corrosion resistance, lightweight, and low cost characteristics. The correct selection, installation, and maintenance can ensure its efficient and reliable operation in various application environments.