비교 소개: 웨지 게이트 밸브 및 평행 게이트 밸브

게이트 밸브는 통로의 중심선을 따라 디스크가 수직 방향으로 움직이는 밸브입니다.. 게이트 밸브는 주로 파이프라인 차단에 사용됩니다..

가장 일반적인 분류 중 하나는 밀봉 표면의 구성에 따라 웨지 게이트 밸브와 평행 게이트 밸브로 나눌 수 있습니다..

웨지 게이트 밸브는 다음과 같이 나눌 수 있습니다.: 단일 디스크 유형, 더블 디스크 타입과 탄력있는 디스크 타입; 평행 게이트 밸브는 단일 디스크 유형과 이중 디스크 유형으로 나눌 수 있습니다.

평행 게이트 밸브의 밀봉 표면은 파이프 축에 수직입니다., 그건, 두 개의 밀봉 표면이 서로 평행합니다. 수입 게이트 밸브.

웨지 게이트 밸브의 밀봉 표면은 파이프 축과 비스듬히 위치합니다., 그건, 두 개의 밀봉 표면을 쐐기 모양의 게이트 밸브로 만듭니다.. 쐐기의 경사각의 크기는 주로 매체의 온도에 따라 달라집니다., 일반적으로 작동 온도가 높을수록, 취한 각도가 클수록, 온도 변화 시 게이트 웨징 가능성을 줄이기 위해.

The design concepts, operating principles, performance characteristics, and suitable applications for these two structures differ significantly. For end-users, a thorough understanding of these differences is key to making informed selection decisions, ensuring system stability, and optimizing procurement costs.

As a globally recognized top-tier valve manufacturer, Farpro YD Valve possesses extensive valve data and information to enlighten our customers on gate valve knowledge. Here, the Farpro YD Team will provide a detailed explanation of the distinctions between parallel gate valves and wedge gate valves, offering valuable insights based on our vast experience. Farpro가 평행 게이트 밸브와 웨지 게이트 밸브의 차이점을 자세히 설명합니다.:

Part One: Gate Valve Fundamentals Recap

Before diving into the comparison, let’s briefly review the basic concepts of gate valves:

1. Operating Principle: By rotating a handwheel or activating an actuator, the valve stem is driven to perform a lifting motion (Outside Screw & 멍에 – 운영체제&Y type) or remain in place while the gate moves (비 상승 줄기 – NRS 유형). This action drives the connected gate up or down within the valve body, perpendicular to the fluid channel. When the gate is fully lifted, the passage is completely open, offering minimal resistance to flow. When the gate is fully lowered and seals tightly against the valve seat, the passage is completely closed, achieving shut-off.

2. Main Advantages:

   • Low Flow Resistance: 완전히 열면, the gate is completely withdrawn from the flow path, allowing the medium to flow almost straight through, resulting in very low pressure drop.

   • Relatively Low Operating Torque: Compared to globe valves, the gate moves perpendicular to the flow direction, requiring less force to overcome fluid pressure during opening and closing.

   • No Restriction on Flow Direction: Gate valves are typically bidirectional, meaning they can be installed and operated regardless of the flow direction.

   • Wide Range of Applications: Suitable for various media (liquids, 가스, 증기, 슬러리, 등.), 압력, and temperature ranges.

   • Relatively Simple Structure, 쉬운 유지보수.

3. Main Disadvantages:

   • Not Suitable for Throttling: In a partially open state, high-velocity fluid can easily erode the sealing surfaces, leading to valve damage and leakage. 뿐만 아니라, the relationship between flow rate and opening percentage is non-linear, making precise flow control difficult.

   • Slow Operation: The gate has a relatively long travel distance, requiring significant time to complete a full open or close cycle.

   • Large Overall Dimensions and Height: Especially for OS&Y types, the rising stem requires considerable overhead space when the valve is open.

   • Sealing Surfaces Prone to Abrasion: During opening and closing, relative friction occurs between the gate and seat sealing surfaces, particularly under pressure or when the medium contains solid particles.

평행 게이트 밸브의 특징

평행 게이트 밸브 가장 일반적인 더블 디스크 유형입니다., 밸브 본체와 두 개의 밀봉 표면 접촉 사이의 게이트를 단단히 닫으려면, 양면 스러스트 웨지가 있는 두 개의 게이트 플레이트 샌드위치에 자주 사용됩니다..

이런 식으로, 밸브를 닫을 때, 밸브 본체 바닥과의 양면 스러스트 쐐기 접촉이 점차적으로 응력을 받습니다., 게이트 밀봉 표면과 밸브 몸체가 밀봉되고 단단히 고정되도록 이중 게이트 플레이트를 밀어서 엽니다.. 이러한 종류의 이중 디스크 평행 게이트는 일반적으로 자주 열고 닫을 필요가 없는 작업 조건에 적용됩니다., 게이트를 완전히 열거나 완전히 닫아두세요..

Main Structural Types:

Parallel Slab Gate Valve / Through-Conduit Gate Valve:

• • • Structure: Typically features a single, flat gate (slab) with a bore (port) machined through it, matching the pipeline diameter. The slab slides between two parallel seats.

    • Operation: To close, the slab slides down, and its solid portion blocks the flow path. To open, the slab slides up, aligning the through-conduit port with the pipeline, creating a smooth, unobstructed passage. Sealing usually relies on line pressure pushing the slab against the downstream seat (self-sealing), sometimes assisted by spring-loaded seats providing initial sealing force.

    • Advantages:

      • 최소 흐름 저항: 완전히 열면, the port matches the pipe bore, offering a smooth, non-restrictive flow path, ideal for pipelines requiring low pressure drop, such as long-distance transport lines.

      • Sealing Surface Protection: In both fully open and fully closed positions, the sealing surfaces are shielded from the main flow, protecting them from erosion and wear, especially suitable for media containing solid particles or abrasives.

      • Suitable for Pigging: The smooth through-conduit allows pipeline inspection gauges (Pigs) to pass through.

      • Relatively Lower Operating Torque: Primarily needs to overcome friction, no wedging force involved.

    • Disadvantages:

      • Sealing tightness at low pressure might be less positive than wedge types, as self-sealing effectiveness depends on sufficient differential pressure.

      • Structural dimensions, particularly face-to-face length, can be larger.

      • Manufacturing costs can be higher, especially for large diameters and high pressure ratings.

병렬 이중 디스크 게이트 밸브:

• • • Structure: Comprises two parallel discs, usually with a spring or spreader mechanism (like a wedge or toggle) located between them.

    • Operation: As the gates descend near the closed position, the spring or spreader mechanism activates, forcing the two discs outwards against their respective upstream and downstream seats, achieving a double seal. During opening, this spreading force is released first, allowing the discs to lift freely.

    • Advantages:

      • Excellent Bidirectional Sealing: Provides effective sealing regardless of the direction of flow or pressure.

      • Reliable Low-Pressure Sealing: The mechanical spreading force ensures a tight seal even at very low differential pressures.

      • Avoids Thermal Binding: The absence of a wedge angle eliminates the risk of jamming due to temperature changes or pressure fluctuations, making it ideal for high-temperature, high-differential pressure, and thermal cycling applications.

      • Potential for Self-Relieving Function: Some designs allow overpressure trapped in the body cavity to automatically bleed off to the upstream side, enhancing safety (specific design must be confirmed).

    • Disadvantages:

      • Relatively complex structure with more parts, leading to higher manufacturing and maintenance costs.

      • Potential for debris accumulation between the discs, which could affect sealing or operation.

      • Typically larger and heavier than wedge gate valves of the same specification.

Parallel Gate Valve Characteristics Summary:

Advantages:

• No risk of thermal binding, suitable for high-temperature and fluctuating temperature service.

• Relatively lower operating torque (especially slab gate type).

• Through-conduit design protects sealing surfaces, suitable for particulate media and pigging operations.

• Double disc design offers reliable bidirectional and low-pressure sealing.

Disadvantages:

• Single-gate self-sealing types may have weaker sealing at very low pressures.

• Double disc types are structurally complex, costly, and bulky.

• High manufacturing precision required, especially for parallelism and flatness.

Typical Application Areas:

• Oil and gas long-distance pipelines (primarily through-conduit parallel slab gate valves, often to API 6D).

• High-temperature steam lines (예를 들어, main steam lines in power plants, often using double disc parallel types).

• Refineries and chemical plants for high-temperature, high-pressure services or where pigging is required.

• Low-pressure gas distribution lines.

• Applications requiring reliable bidirectional sealing.

대개, 파이프라인과 직접 연결되는 경우, 평행 게이트 밸브를 사용하는 것이 좋습니다, 컴팩트한 구조의 장점을 가지고 있는, 가벼운 무게, 작은 크기, 쉬운 유지 보수, 편리하고 유연한 작동, 등.

웨지 게이트 밸브의 특징

웨지 게이트 밸브 싱글/더블 디스크 웨지 게이트 밸브 보유. 이중 디스크 웨지 게이트 밸브의 장점은 밀봉이며 정확도 요구 사항의 각도는 낮습니다., 온도 변화는 게이트 웨지를 만드는 것이 쉽지 않습니다., 씰링 표면 마모는 개스킷을 추가하여 보상할 수 있습니다..

단점은 구조가 복잡하다는 점, 건조한 매체에 붙이기 쉽습니다., 주로 상부 및 하부 배플 플레이트는 수년간의 부식 후에 떨어지기 쉽습니다..

그러므로, 단일 디스크 웨지 게이트 밸브는 구조가 간단하고 신뢰성이 높아서 많이 사용됩니다., 특히 탄력적인 게이트로 변경한 후, 씰링 표면 각도 처리 시 발생하는 편차를 보상하기 위해 약간의 탄성 변형을 생성할 수 있습니다..

Wedge Angle: The selection of the wedge angle is a critical design parameter, typically dependent on the medium temperature, 압력 등급, and valve size.

• Temperature Influence: Higher operating temperatures lead to more significant thermal expansion differences in materials. To prevent the gate from becoming “wedged shut” or experiencing “thermal binding” at high temperatures, a larger wedge angle is usually chosen. 거꾸로, for ambient or low temperatures, a smaller wedge angle can be used for better sealing and lower operating torque.

• Common Angles: Generally range from 3° to 10°. 예를 들어, API 600 often specifies 5° or higher.

Main Structural Types：

• Solid Wedge Gate Valve:

  • Structure: The gate is a single, solid wedge piece.

  • Advantages: Simplest structure, robust, 튼튼한, relatively low cost, less prone to trapping debris, suitable for most general applications, especially in small to medium sizes and low to medium pressures.

  • Disadvantages: Poor adaptability to sealing surface machining inaccuracies and valve body deformation. Temperature changes or pipeline stresses can lead to poor sealing or gate jamming (thermal binding). Closing under high differential pressure can create excessive wedging force, making opening difficult.

• Flexible Wedge Gate Valve:

  • Structure: The main body of the gate is still wedge-shaped, but features cuts, slots, or a specific peripheral design allowing it some elastic deformation capability.

  • Advantages: Can compensate for minor valve body distortions caused by temperature changes or pipeline loads, enhancing sealing reliability. Effectively prevents high-temperature thermal binding. Less demanding on the precision of sealing surface angle machining. Offers better sealing performance than solid wedges. Farpro YD Valve has mature technology in the design and manufacture of high-performance flexible wedge gate valves.

  • Disadvantages: Structure is slightly more complex than a solid wedge, leading to a marginally higher manufacturing cost. Not ideal for media containing significant solid particles or prone to scaling, which could clog the flexible structure.

• Split Wedge / Double Disc Wedge Gate Valve:

  • Structure: Consists of two independent discs (often connected by a mechanism like a ball-and-socket joint, pin, or dovetail) forming a composite wedge shape. Upon closing, external forces (like stem thrust or a bottom spreader) allow the two discs to move slightly apart laterally, pressing independently against their respective seats.

  • Advantages: Both sealing surfaces can achieve independent contact with the seats, providing excellent self-alignment. This offers better adaptability to seat angle variations and body deformation, resulting in superior sealing performance, especially under high pressure and high temperature conditions. Minor sealing surface wear can be compensated for by the outward movement of the discs. Less prone to thermal binding.

  • Disadvantages: Most complex structure, more parts, higher manufacturing cost, relatively more difficult to assemble and repair. Potential for media to become trapped between the discs. In designs with bottom guides, corrosion and detachment of these guides over time can impair function.

Wedge Gate Valve Characteristics Summary:

• Advantages:

  • 우수한 밀봉 성능: Relies on wedging action for positive sealing, providing high sealing pressure and reliability.

  • Relatively compact structure (compared to parallel gate valves of the same size).

  • Wide range of applications: Suitable for various pressures, 온도, and media (selection depends on materials and specific structure).

  • Mature technology, highly standardized (예를 들어, API, ASME standards).

• Disadvantages:

  • Risk of thermal binding: Especially with solid wedges in applications with significant temperature fluctuations or cooling after high-pressure closure.

  • Relatively high operating torque: Must overcome the friction associated with the wedging action.

  • Sealing surfaces prone to wear: Due to relative sliding friction during operation.

  • Not suitable for rapid opening/closing.

Typical Application Areas:

• 전력 산업 (증기선, feedwater systems, ash handling systems, 등.)

• 석유 및 가스 (oilfields, 정유소, some pipeline applications)

• 화학 산업 (various process fluid lines)

• Metallurgy and mining (process water, slurry handling, 등.)

• Municipal water supply and wastewater treatment

• General industrial services

일반적으로, 웨지 게이트 밸브의 스템은 강화되고 표면이 질화 처리되어 내식성과 긁힘 방지가 우수합니다.. 게이트 및 시트 씰은 경질 합금 오버레이 용접으로 제작되었습니다., 내마모성이 있는 것, 고온 내성, 부식 방지, 좋은 긁힘 방지 성능과 긴 서비스 수명. 밸브 본체 재질의 다양성이 완성되었습니다., 포장, 실제 작업 조건 또는 사용자 요구 사항에 따른 개스킷 합리적인 선택 사항, 다양한 압력에 적용 가능, 온도 및 매체 작업 조건.

Wedge Gate Valve vs. Parallel Gate Valve – In-Depth Comparison

To aid in making a clearer choice, we directly compare these two valve types across several key dimensions:

Selection and Purchasing Guidance – Professional Advice from Farpro YD Valve

Choosing between a wedge gate valve and a parallel gate valve isn’t about determining which one is universally “better,” but rather identifying which one is “more suitable” for a specific application. As a responsible valve supplier, Farpro YD Valve recommends considering the following key factors during selection:

Operating Conditions are Fundamental:

• Media Properties: Is it a clean fluid, 가스, 증기, or does it contain solid particles, 슬러리, viscous material, or crystallizing substances? This directly impacts whether sealing surface protection is needed (advantage: parallel slab gate) or if specific materials and structures are required.
• 압력 등급: In high-pressure applications, the positive sealing of a wedge gate valve (especially split wedge) can be very reliable, but consider the operating torque and potential binding issues under high differential pressure. Parallel double disc types also perform well under high pressure.
• Temperature Range & Fluctuation: For high temperatures or significant temperature swings, parallel gate valves (lacking a wedge angle) are the preferred choice to avoid thermal binding. If selecting a wedge type, prioritize flexible wedge or split wedge designs and pay attention to the wedge angle selection.

Functional Requirements Guide the Choice:

• Sealing Level Requirement: Is zero leakage or a very high sealing class required? Split wedge and parallel double disc types generally offer superior sealing performance.
• Operating Frequency: Gate valves are inherently unsuitable for frequent operation. If relatively frequent cycling is necessary, consider a parallel gate valve with lower operating torque or select an appropriate actuation method.
• Need for Pipeline Pigging: For applications like long-distance pipelines where pig passage is required, a through-conduit parallel gate valve is mandatory.
• Need for Automatic Cavity Pressure Relief: Certain parallel double disc gate valves offer this safety feature; confirm based on specific process requirements.

Economic and Maintenance Considerations:

• • Initial Purchase Cost: 일반적으로, solid/flexible wedge gate valves have the lowest cost, followed by slab gate and split wedge types, with double disc parallel gate valves typically being the most expensive. 하지만, this is a general guideline influenced by materials, standards, brand, 등.

  • Maintenance Convenience and Cost: Simpler structures usually mean easier maintenance. Consider the valve’s expected lifespan, maintenance intervals, and replacement costs.

  • Space and Weight Constraints: Parallel gate valves are often larger and heavier, requiring consideration of installation space and support structures.

Industry Codes and Standards:

• • Ensure the selected valve complies with relevant industry codes (예를 들어, 기름 & 가스, 힘, 화학적인) and standards (예를 들어, API, 저 같은, 안에, GB). All Farpro YD Valve products are designed and manufactured in strict accordance with international and national standards.

Purchasing Recommendations

• Define Needs Clearly, Communicate Thoroughly: Before inquiring or purchasing, provide your supplier (like Farpro YD Valve) with detailed operating parameters and functional requirements. Our technical team will leverage your specific needs to recommend the most suitable valve type and specification.

• Focus on Quality and Brand Reputation: Valves are critical equipment; choosing a reliable brand with a proven quality record is essential. Farpro YD Valve operates under robust quality management systems (예를 들어, ISO 9001) and utilizes advanced manufacturing and testing equipment to ensure every valve meets high-quality standards.

• Consider Total Cost of Ownership (TCO) / Lifecycle Cost: Look beyond the initial purchase price. Evaluate the valve’s performance, 신뢰할 수 있음, 서비스 수명, maintenance costs, and the potential costs associated with failure. Choosing a high-performance, long-lasting valve (even if initially more expensive) often yields better long-term economic benefits.

• Value Technical Support and Service: Select a supplier capable of providing professional technical consultation, selection guidance, after-sales service, and spare parts availability. Farpro YD Valve is committed to offering a seamless and supportive experience for our customers.

결론

Wedge gate valves and parallel gate valves, as two major branches of the gate valve family, each possess unique design philosophies, performance advantages, and application niches.

• 웨지 게이트 밸브, with their powerful wedging seal, relatively compact structure, and broad applicability, dominate many conventional industrial sectors. Derived designs like the flexible wedge and split wedge further enhance performance and reliability.

• Parallel gate valves, characterized by their immunity to thermal binding, suitability for high temperatures and particulate media (through-conduit type), and excellent bidirectional and low-pressure sealing capabilities (double disc type), demonstrate irreplaceable advantages in specific high-end applications and demanding operating conditions, such as long-distance pipelines and high-temperature steam systems.

There is no absolute superiority, only relative suitability. Understanding their core differences and making scientific selections based on specific application requirements are prerequisites for ensuring the safe, 효율적인, and economical operation of fluid control systems.

Farpro YD Valve offers a comprehensive product line of both wedge and parallel gate valves, covering various materials, 압력 등급, actuation methods, and standard compliance. We not only provide standardized high-quality products but also offer customized solutions tailored to your unique needs. Whatever fluid control challenges you face, our professional team is ready to provide the most accurate selection advice and the highest quality valve products.

Choose Farpro YD Valve – Choose Professionalism, Choose Reliability. We welcome you to contact us anytime to discuss your valve requirements!