Gate valves are a common type of valve in industrial pipelines, primarily used for shutting off the flow of fluids. Based on the design of the gate and the sealing method, gate valves can be divided into wedge gate valves and parallel gate valves. Although these two types of gate valves serve similar purposes, there are significant differences in their structure, working principles, and application scenarios. 1. Valve plate design Wedge Gate Valves The gate of the wedge gate valve is wedge-shaped, and the contact surface between the gate and the seat is inclined. When the valve is closed, the wedge-shaped gate wedges into the seat, creating a tight seal. The wedge design enhances the sealing effect through the wedging action. Depending on the working conditions, the wedge gate valve can be designed as a rigid wedge, elastic wedge, or double parallel wedge. The rigid wedge gate has a simple structure but may jam due to thermal expansion in high-temperature conditions; the elastic wedge gate can adapt to temperature changes through deformation, reducing the risk of jamming. Parallel Gate Valves The valve plate of the parallel gate valve features a parallel double-plate structure, with the plates making parallel contact with the seat rather than wedging in. When the valve is closed, the valve plates are pressed against the seat by the pressure of the medium or external force, achieving a seal. The parallel design reduces the impact of thermal expansion on sealing, making it less likely to experience sticking due to temperature changes. 2. Sealing Method Wedge Gate Valves Wedge gate valves achieve sealing through the wedging action of the gate. When closed, the wedge-shaped gate makes tight contact with the seat, ensuring stable sealing performance even under high temperature and high pressure conditions. One advantage of the wedge design is that it can provide good sealing even without media pressure, thanks to the mechanical wedging action. Therefore, wedge gate valves are particularly suitable for applications requiring high sealing performance, such as steam and high-temperature fluids. Parallel Gate Valves The sealing of the parallel gate valve relies on the pressure of the medium or external force. If the medium pressure is low, the sealing performance may not be as effective as that of the wedge gate valve. The parallel design is typically used for low-pressure conditions, but some parallel gate valves utilize spring or lever mechanisms to assist with sealing. The parallel double-plate design of the parallel gate valve can adapt to temperature changes, preventing it from seizing due to thermal expansion like the wedge gate valve. 3. Operating Torque Wedge Gate Valves Due to the wedge design, the gate wedges into the seat when closed, requiring a larger torque for opening and closing. This is especially true in high-pressure conditions, where the friction between the gate and the seat increases, making the operation relatively laborious. For ap...

Wedge gate valves are a common type of gate valve, with the gate designed in a wedge shape, used to cut off or allow the flow of fluid in pipelines. Due to their excellent sealing performance, wedge gate valves are particularly suitable for harsh conditions such as high temperature and high pressure, and are widely used in industries like oil, natural gas, chemicals, and power generation. 1. Working Principle The core component of a wedge gate valve is a wedge-shaped gate. When the valve is closed, the gate descends gradually along the stem's movement, creating a wedging seal with the seat. Due to the wedge design, the gate not only relies on vertical pressure when closing but also makes close contact with the seat through the wedging action, ensuring that fluid does not leak. When the valve is fully opened, the wedge gate completely separates from the seat, allowing fluid to flow through the valve unobstructed. This makes wedge gate valves very suitable for on/off operations, but not ideal for flow regulation. 2. Structural Characteristics (1) Wedge-shaped gate: The gate is wedge-shaped and can be designed as a rigid wedge, elastic wedge, or double-parallel wedge. The rigid wedge structure is simple and sturdy, but under high temperatures, the valve may seize due to thermal expansion. The elastic wedge design allows the gate to slightly deform with temperature changes, accommodating expansion and preventing jamming. (2) Bidirectional sealing: Wedge gate valves are generally designed with bidirectional sealing, meaning that regardless of the direction of fluid flow, the valve can achieve effective sealing when closed. This feature enhances their flexibility in complex piping networks. (3) Unobstructed in fully open state: When the valve is fully opened, fluid flows through the valve with minimal resistance, reducing energy loss and turbulence. This is particularly important in applications requiring high flow transmission. 3. Advantages (1) Excellent sealing performance: The wedge design generates significant sealing force between the gate and the seat, giving wedge gate valves superior sealing performance, especially in high temperature and high pressure conditions. (2) High temperature and high pressure resistance: Wedge gate valves are commonly used in high temperature and high pressure environments, particularly in steam systems and hot oil transmission where there are significant temperature differences. The wedge design effectively addresses thermal expansion issues caused by temperature variations. (3) Sturdy structure: Wedge gate valves have a relatively simple and robust structure, making them easy to maintain and suitable for long-term use. 4. Application Scenarios (1) Oil and gas industry: Wedge gate valves are commonly used in pipelines for transporting oil and gas, especially in high-pressure pipelines and long-distance transmission networks. (2) Chemical industry: Wedge gate valves are often used in chemical installations to ensure ...

Recently, DERVOS successfully completed a local project in Singapore, providing high-quality globe valve products that ensured efficient operation and safety throughout the project. Background The client for this project was a Singapore-based on-site repair and maintenance company, primarily responsible for the daily maintenance and emergency repairs of industrial facilities. Their core requirement was to provide reliable isolation valves for high-pressure steam systems, ensuring efficient and safe operation under high-pressure and high-temperature conditions. Facing issues such as valve aging and high maintenance costs, the customer urgently needed a solution that could provide long-term stable performance. Product Features To meet the customer's strict requirements for steam medium management, we provided a high-pressure steam isolation globe valve. This valve is specifically designed for steam isolation, featuring excellent high-pressure resistance. It is manufactured using precision machining processes to ensure stable sealing and long-lasting performance, even under high-temperature and high-pressure conditions. The valve not only meets strict international standards but also underwent multiple tests at the project site, demonstrating exceptional performance. Project Results The globe valve was successfully installed and put into operation. The client reported that their high-pressure steam system is running smoothly, with more stable and safer operation. The precise control of the valve not only improved the efficiency of maintenance work but also significantly reduced system failures and safety risks. The client highly praised the performance and service of our products, stating that our solution greatly supported their daily maintenance and emergency response capabilities. The success of this project has not only enhanced the client's maintenance efficiency and system safety but also laid a solid foundation for future cooperation between both parties. We are proud to have been involved in this project and look forward to continuing to provide high-quality fluid control solutions for our clients in the future.