Изучение различных типов задвижек в промышленных приложениях

 
In industrial production, gate valves play a pivotal role as crucial fluid control devices. Different types of gate valves are designed and structured to suit various working conditions and mediums. In this article, we delve into the exploration of different types of gate valves, comparing their characteristics and application scopes, aiming to help readers gain a better understanding and make informed decisions when selecting the appropriate gate valve type to meet their specific requirements.
 

1. Wedge Gate Valve

 
Wedge gate valves feature a relatively simple design with a compact structure, making them suitable for high-temperature mediums prone to coking. However, their sealing performance may not be as robust as other types of gate valves at elevated temperatures, imposing certain limitations on their usage in high-temperature environments. Nonetheless, wedge gate valves still possess unique advantages, especially in specific industrial scenarios such as handling mediums prone to coking.
 

2. Flexible Wedge Gate Valve

 
The flexible wedge gate valve represents a special form of the wedge gate valve. Compared to its rigid counterpart, the flexible wedge gate valve exhibits superior sealing performance at high temperatures, with the gate not prone to jamming after being heated. This makes it suitable for mediums like steam, high-temperature oil, and gas, especially in applications requiring frequent operation. However, it's not advisable for use with mediums prone to coking, a crucial limitation to consider.
 

3. Double Disc Gate Valve

 
The double disc gate valve offers improved sealing performance compared to the wedge gate valve. Even when the sealing surfaces' angles and seat fittings are not precisely aligned, it still maintains good sealing. Additionally, maintenance is relatively simple, as worn sealing surfaces can be replaced with metal pads without the need for welding or grinding. However, its higher number of components may lead to increased maintenance costs. Apart from applications involving steam, oil, and similar mediums, it's also suitable for frequent operation and mediums with significant sealing surface wear, but unsuitable for coking-prone mediums.
 

4. Parallel Gate Valve

 
Parallel gate valves are suitable for low-temperature and low-pressure mediums, although their sealing performance is inferior to other types of gate valves. Their design simplicity makes machining and maintenance of the gate and seat sealing surfaces relatively easy. However, designs relying on wire fixation for two gate plates may suffer from reliability issues. Therefore, careful consideration of both sealing performance and reliability is essential when selecting parallel gate valves.
 
Choosing the right gate valve that suits the working environment and medium characteristics is paramount. Each type of gate valve has its own advantages and limitations, requiring comprehensive consideration based on specific circumstances. With continuous technological advancements and evolving industrial demands, gate valve types and designs will continue to evolve and improve to meet the ever-changing industrial requirements. Thus, staying updated and informed about the trends in gate valve technology is crucial for future industrial applications.