normally closed butterfly valve
The butterfly plate is installed in the valve body and connected to the drive device through the valve stem. The rotation of the butterfly plate is realized by the action of the drive device, thereby controlling the on-off of the fluid in the pipeline. This valve plays a key role in various pipeline systems that require strict control of fluid flow direction and flow.
Advantages and features
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Precise flow control: By adjusting the stroke of the drive device and the opening angle of the butterfly plate, the fluid flow can be precisely controlled. In the industrial production process, for some process links that require precise control of the flow of raw materials or finished products, the normally closed butterfly valve can ensure the stability of the production process and the consistency of product quality.
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Strong and durable structural design: The valve body and butterfly plate are made of high-strength materials and are processed by special processing technology to have good pressure resistance, impact resistance and corrosion resistance. It can withstand the high-pressure impact of the fluid in the pipeline and various stresses of the external environment. It can still operate stably under harsh working conditions, reducing maintenance and replacement costs.
Application Scenario
✔ Sewage treatment system: In each treatment link of the sewage treatment plant, the normally closed butterfly valve is used to control the flow direction and flow of sewage and sludge. In the sewage lifting pump station, it is installed on the outlet pipe of the pump. When the pump stops running, the valve automatically closes to prevent sewage backflow; in the sludge treatment system, it is used to accurately control the sludge delivery volume to ensure the stable operation of the sludge treatment process.
✔ Power industry: In the cooling system, steam system and other pipelines of thermal power plants and nuclear power plants, it is used to control the on-off and flow of fluids. In the cooling system, when the equipment fails or needs maintenance, the normally closed butterfly valve is closed to prevent cooling water leakage; in the steam system, the normally closed butterfly valve is used to adjust the flow of steam to ensure the normal operation of the power generation equipment.
FAQ
Q: How quickly can it close in case of an emergency shutdown?
A: It is designed to close rapidly in case of an emergency shutdown. Equipped with high - speed actuators, it can typically achieve a full - close state within a few seconds. This quick response time is crucial for preventing potential disasters, such as in a gas pipeline system where sudden leaks could lead to explosions. The fast - acting mechanism ensures that the flow of the medium is halted promptly, minimizing the risk of accidents.
Q: What measures are in place to prevent it from accidentally opening during normal operation?
A: Firstly, it often has a locking mechanism on the actuator, which can be physically secured to prevent unauthorized operation. Additionally, the control system is designed with safety interlocks. These interlocks ensure that the valve remains closed unless specific conditions, such as a proper authorization signal or a change in the process control parameters, are met. This double - layer protection significantly reduces the chances of an unexpected opening.
Q: Can it be adjusted to have different closing speeds according to different application requirements?
A: Yes, it can be adjusted to have different closing speeds according to different application requirements. Many modern normally closed butterfly valves are equipped with adjustable actuators. On the other hand, in a chemical plant dealing with highly volatile substances, a faster closing speed may be required, and this can be easily achieved by adjusting the actuator settings.
Q: How does it maintain its sealing performance over a long - term period?
A: It maintains its sealing performance over a long - term period through the use of high - quality sealing materials. The seat and the disc are designed with precision - engineered sealing surfaces, and the materials are chosen for their durability and resistance to wear and tear. Regular maintenance, such as periodic inspection and replacement of the sealing elements when necessary, also helps.
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