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The butterfly valve is a basic component in the field of fluid control and regulation. It is known for its simplicity and effectiveness and has applications in various industries that require precise control of fluids. The following is a detailed description of the composition, structure, working principle, applications and advantages of a typical butterfly valve.

Construction and components

A typical butterfly valve mainly consists of a round disc or plate that rotates on an axis inside the pipe to control the flow. The disc is installed in the center of the pipe and is connected to an actuator outside the pipe, which rotates it 90 degrees around the axis to control the flow. The valve body, disc, stem, actuator and seat are the main components of a butterfly valve.

Valve body: The valve body is usually composed of an elastomeric liner and a metal or thermoplastic shell, providing structural integrity and support.
Disc: The disc is located in the center of the pipe and the design varies - from a simple flat plate to a more complex profile with aerodynamic features, depending on the application.
Stem: Connects the actuator to the disc, transmitting the rotational motion to control the flow.
Actuator: An external mechanism (manual lever, pneumatic, hydraulic or electric motor) used to rotate the disc.
Seat: The sealing surface that the disc contacts, ensuring a tight closure when closed.

Working Principle

1. Open and close: When the actuator rotates, it turns the disc from a fully closed position (perpendicular to the flow) to a fully open position (parallel to the flow), or anywhere in between to regulate flow.

2. Flow control: In the fully open position, the disc is parallel to the flow direction, minimizing resistance and allowing maximum flow. In the closed position, it is vertical, completely blocking flow.

3. Sealing: The disc presses against the seat to form a seal to prevent leakage when closed.

Types of butterfly valves

Butterfly valves can be divided into many types according to different classification standards:
* Classification by end connection method: Common ones are wafer, semi-lug and lug, flanged and welded, etc.
* Classification by eccentricity: There are mainly concentric, double eccentric and triple eccentric butterfly valves. Each type of butterfly valve has its own unique characteristics and applicable scenarios.
* Classification by sealing material: Depending on different operating conditions, the sealing material of butterfly valves can be metal seats or elastomers such as nitrile rubber (NBR), polytetrafluoroethylene (PTFE), etc.

* Dongzheng Butterfly Valve is divided into Regular Butterfly Valve, Mixproof Butterfly Valve, Powder Butterfly Valve, Three-way Butterfly Valve

Applications

1. Water and wastewater: Control the flow in water treatment plants, pipelines and drainage systems.
2. Oil and gas: Regulate the flow in pipelines, storage tanks and refineries.
3. Chemical processing: Handle corrosive liquids and chemicals in the manufacturing process.
4. HVAC systems: Control cooling water, heating and ventilation systems in buildings.
5. Food and beverages: Manage the flow in processing and bottling plants.

Advantages
*Compact design: Takes up less space than other types of valves.
*Fast operation: Fast opening/closing action reduces downtime and improves efficiency.
*Cost-effectiveness: Lower initial cost and maintenance cost compared to gate valves or globe valves.
*Versatility: Suitable for a wide range of applications and fluid types.
*Low pressure drop: Minimal obstruction to flow when fully open.

Disadvantages:
*Pressure loss: Since the butterfly plate is always in the flow path, it will cause a certain pressure loss even in the closed state.
*Durability issues: Under certain extreme conditions, such as hard water environments, the sealing performance of butterfly valves may be affected.

In summary

The Regular Butterfly Valve embodies the efficiency and simplicity of fluid control mechanisms. The wide application of butterfly valves in various industries highlights their reliability and adaptability to various operational needs. From water treatment facilities to industrial processes, butterfly valves continue to play a vital role in ensuring efficient fluid management and system integrity.