The plug valve is a commonly used fluid control valve, widely applied in industries such as oil, natural gas, and chemicals due to its high sealing performance and ease of operation. The valve features a simple design, where a rotating plug controls the flow direction of the fluid, ensuring safe operation in systems involving high pressure, high temperature, and hazardous media. 1. Working Principle The core structure of a plug valve is a cylindrical or conical plug with a through passage. When the plug rotates, the passage aligns or misaligns with the fluid pathway of the valve body, thus controlling the opening and closing of the valve. (1) Open Position When the passage on the plug valve aligns with the fluid pathway of the valve body, the fluid can flow directly through the valve, ensuring an unobstructed flow. This design minimizes pressure loss during fluid flow, making it suitable for applications where maintaining stable flow is essential. (2) Closed Position When the plug is rotated 90 degrees, the passage becomes perpendicular to the fluid pathway, completely cutting off the flow of fluid, achieving the closed position. The 90-degree rotation of the plug valve allows for a complete shutdown of the fluid flow, offering a quick response, making it ideal for emergency shut-off applications. 2. Structural Characteristics (1) Types of Plug Valves Plug valves typically come in two types: conical and cylindrical plugs. The conical plug provides better sealing performance but may require additional lubrication or material support at high temperatures, while the cylindrical plug operates smoothly and is suitable for applications requiring frequent on/off operation. (2) Sealing Materials The sealing design of plug valves typically uses PTFE (Polytetrafluoroethylene) or other non-metallic lining materials, which offer high corrosion resistance and flexibility, ensuring good sealing performance even under high pressure. Additionally, some high-end plug valves employ metal-to-metal sealing for extreme environments, preventing seal failure. (3) Wear and Corrosion Resistance The internal materials of plug valves are typically made of corrosion-resistant materials such as stainless steel or nickel-based alloys, preventing wear caused by medium corrosion. This makes them suitable for transporting acidic or corrosive media and is commonly used in the chemical industry and refining systems. (4) Simple Maintenance The internal structure of the plug valve is simple, with no complex springs or valve disc mechanisms, making disassembly and maintenance relatively easy. In high-temperature and high-pressure environments, specific materials and designs can be selected to extend the valve’s service life and reduce subsequent maintenance costs. 3. Application Scenarios The application of plug valves is commonly found in critical situations where leakage prevention is essential, as well as in systems requiring rapid opening and closing or fluid shut-off. Below are ...
A sleeved plug valve is a specific type of plug valve designed with a non-metallic sleeve or liner that surrounds the plug, creating a tight seal. This sleeve, often made from materials like PTFE (polytetrafluoroethylene), ensures a low-friction, corrosion-resistant seal, making the valve suitable for various applications where leakage prevention, durability, and chemical resistance are crucial. 1. How Sleeved Plug Valves Work In a sleeved plug valve, the plug rotates within a sleeve liner rather than directly against the metal body. This design reduces wear on the valve body and allows for smoother, more consistent operation. When the valve handle is turned, the plug rotates, opening or closing the flow path. The sleeve not only provides a tight seal but also allows for a self-lubricating effect, enhancing the valve’s longevity and performance. 2. Key Features and Advantages (1) Leakage Prevention The non-metallic sleeve acts as a reliable seal around the plug, minimizing the risk of external leakage. This feature is especially important in industries handling hazardous chemicals, as it prevents leaks and potential environmental contamination. (2) Corrosion and Chemical Resistance Sleeved plug valves are ideal for handling corrosive or abrasive fluids. The PTFE or other chemically resistant materials used for the sleeve make the valve suitable for environments where standard metal-on-metal contact would degrade over time. (3) Low Maintenance Due to their self-lubricating design, sleeved plug valves require less frequent maintenance compared to traditional plug valves. The sleeve also absorbs some wear, reducing the need for frequent replacements and improving overall valve durability. 3. Applications Industries such as chemical processing, water treatment, and oil and gas frequently use sleeved plug valves due to their reliability and ability to handle tough operating conditions. These valves perform well in systems that require minimal leakage, resistance to aggressive fluids, and easy maintenance.
1. 게이트 밸브의 핵심 기능 문 밸브는 밸브가 완전히 열리거나 완전히 닫히는 산업용 파이프라인의 켜기/끄기 제어에 주로 사용됩니다. 이로 인해 특히 적합합니다. 최소한의 압력으로 막히지 않는 흐름 경로가 필요한 응용 분야용 떨어지다. 2. 직선 흐름 시스템에 가장 적합 하나 게이트 밸브의 이상적인 응용 분야 중 직선 흐름 시스템이 있습니다. 흐름 제한을 최소화해야 하는 경우. 완전히 열리면 게이트 밸브가 명확하고 중단되지 않는 흐름 경로를 제공하므로 다음과 같은 경우에 탁월한 선택이 됩니다. 그러한 환경. 3. 격리 서비스에 널리 사용됨 문 밸브는 완전히 차단하거나 차단하는 데 사용되는 격리 서비스에 탁월합니다. 흐름을 허용합니다. 따라서 신뢰성이 요구되는 시스템에 필수적입니다. 석유, 가스 및 화학 산업과 같은 차단. 4. 대구경 및 고압 시스템에 이상적 을 위한 대구경 파이프라인 및 고압 응용 분야, 게이트 밸브는 매우 효과적인. 그들은 대량의 산업에서 일반적으로 사용됩니다. 내구성과 내구성으로 인해 유체 및 고압을 관리해야 합니다. 안정적인 작동. 5. 사용상의 제한 단, 게이트 밸브는 스로틀링, 빈번한 작동 또는 사용을 권장하지 않습니다. 잔해물이 있는 시스템에서. 이러한 조건은 밸브 시트의 마모를 유발할 수 있습니다. 시간이 지남에 따라 성능이 저하될 수 있습니다.
