OverviewThe D342H double eccentric butterfly valve is a valve that opens, closes, and regulates the medium flow passage through the rotation of a disc-shaped butterfly plate around its fixed shaft (stem). Its stem axis features a double eccentric design, meaning the stem axis is offset from both the center of the butterfly plate and the center of the sealing surface, while being perpendicular to the centerline of the valve body passage. This design allows the butterfly plate to quickly disengage from the valve seat sealing surface upon opening. The valve adopts a flanged connection, where the valve body comes with integrated flanges that are directly bolted to the pipeline flanges. The sealing pair between the valve seat and the butterfly plate typically employs a metal-to-metal configuration. Specifically, the valve seat consists of a metal sealing ring, and the sealing surface of the butterfly plate is overlaid with hard alloy. The valve seat can be either an overlay welded onto the body or an inserted structure. This design makes the valve suitable for media conditions involving high temperatures, high pressure differentials, and strong abrasiveness. The valve is operated by rotating the stem, typically by 90 degrees, using manual, electric, or pneumatic actuators, achieving tight shut-off and flow control of the medium within the piping system.D342H Double Eccentric Butterfly Valve Product Image Features1、Robust Structure, Strong Applicability: Featuring a flanged connection, the valve body has a relatively sturdy structure that can better withstand pipeline stress and minor vibrations. It is suitable for demanding media conditions involving high temperatures, high pressure differentials, and strong abrasiveness, such as steam, hot air, and media containing solid particles.2、Easy Operation, Reliable Sealing: The double eccentric design allows the butterfly plate to quickly disengage from the valve seat sealing surface the moment it opens, eliminating unnecessary compression and scraping. This design significantly reduces the operating torque, making operation easier, while also minimizing wear on the sealing pair, extending the valve's service life and ensuring excellent sealing performance.3、Low Fluid Resistance: When fully open, the thickness of the butterfly plate is the primary resistance in the media flow path. The flow path shape is approximately circular, thus offering low obstruction to media flow, resulting in low pressure drop and contributing to energy savings.4、Reliable Sealing Form: It typically adopts a metal-to-metal sealing configuration, where the valve seat is a metal sealing ring and the sealing surface of the butterfly plate is overlaid with hard alloy. This sealing structure possesses characteristics of high-temperature resistance, wear resistance, and erosion resistance, enabling it to adapt to relatively harsh operating conditions.5、Relatively Simple Maintenance: The valve has a relatively simple structure. Key components such as the stem and bearing housing are convenient to maintain and replace. The sealing pair design generally offers good wear and erosion resistance, reducing the need for frequent maintenance.6、Specialized Application: Specifically designed for flow control of media under high temperature, high pressure, and abrasive conditions. Body materials are often carbon steel, stainless steel, etc. The butterfly plate can be made of carbon steel, stainless steel, or overlaid with hard alloy. It is widely used in pipeline systems across industries like petroleum, chemical, metallurgy, and electric power for controlling the on-off and flow rate of high-temperature gases, steam, oil, and abrasive media.

OverviewThe D343H hard seal butterfly valve is a flanged connection butterfly valve that utilizes a multi-layer metal hard sealing structure and achieves tight shut-off through the triple eccentric principle. This valve features a triple eccentric geometry comprising axial eccentricity, radial offset, and conical angle eccentricity. This design ensures that the disc completely disengages from the metal seal ring during the opening and closing cycles, creating a wedge-type compressive seal only at the final closed position. The valve stem is operated via a worm gear mechanism, offering easy operation and self-locking functionality. The sealing pair consists of a laminated structure of stainless steel sheets and flexible graphite, or a hardfaced alloy on the disc sealing surface. This forms a high-hardness, wear-resistant hard sealing system against the metal seat, making the valve suitable for demanding conditions involving high temperatures, high pressures, and media containing solid particles.D343H Triple Eccentric Hard Seal Butterfly Valve Product Image Features1、Multi-layer Metal Hard Seal: The sealing pair consists of an elastic sealing ring made of laminated stainless steel sheets and flexible graphite, or features a hardfaced alloy on the disc surface. This creates a multi-layer seal that is wear-resistant, high-temperature resistant, and offers a long service life.2、Triple Eccentric Structure: Through precisely calculated triple eccentric design, the disc completely disengages from the seal ring at the moment of opening, achieving zero friction during rotation. Upon closing, it utilizes the eccentricity to create a progressive wedging action, ensuring reliable sealing with low operating torque.3、High Temperature and Pressure Resistance: The metal sealing structure allows the valve to operate long-term under high temperatures up to 425°C, with pressure ratings up to PN16~PN40. It is suitable for industrial media such as steam, heat transfer oil, and high-temperature flue gas.4、Erosion and Corrosion Resistance: The hard sealing surface effectively resists erosion and corrosion from solid particles, crystals, or mildly corrosive components in the medium. The valve body cavity can be coated with anti-corrosion coatings to extend the overall service life.5、Bidirectional Zero Leakage Seal: Leveraging the self-energizing effect of the eccentric structure, the valve achieves a metal-to-metal seal under both forward and reverse pressure, resulting in bidirectional zero-leakage performance. Installation is not restricted by media flow direction.6、Long Life, Low Maintenance Design: The worm gear drive operates smoothly and reliably. The highly wear-resistant hard sealing pair enables long-term maintenance-free operation under normal conditions. This makes it particularly suitable for critical processes in industries such as power generation, metallurgy, and chemical engineering where high reliability is required.

OverviewThe D363H triple eccentric hard seal butt welded butterfly valve is a high-performance butterfly valve designed based on a triple eccentric structure, which achieves valve opening and closing and flow regulation by rotating the butterfly plate 90 ° around its axis of rotation. Its core features lie in three key eccentric designs: eccentricity between the valve stem axis and the butterfly plate sealing surface, eccentricity between the valve stem axis and the pipeline channel axis, and offset between the conical axis of the butterfly plate sealing surface and the pipeline channel axis. This structure enables the butterfly plate to rotate completely out of contact with the metal hard sealing ring (such as stainless steel, hard alloy) during the opening and closing process. When closed, the bi-directional metal seal is achieved through the wedge-shaped compression effect between the butterfly plate and the valve seat. The valve body adopts butt welding connection method, directly welded with the pipeline, suitable for high temperature, high pressure and corrosive medium working conditions. The driving mode can be adapted to manual, electric, pneumatic or hydraulic devices, and is suitable for reliable cut-off and regulation control of harsh working conditions in industries such as petroleum, chemical, and power. D363H Three Eccentric Hard Seal Butt Welding Butterfly Valve Product Drawing feature1. Triple eccentric sealing structure: adopting a composite design of eccentricity between the valve stem axis and the sealing surface, eccentricity between the valve stem axis and the pipeline axis, and eccentricity of the sealing surface cone angle, achieving frictionless opening and closing of the butterfly plate throughout the entire process, with a hard metal contact of the sealing pair, reliable sealing, and long service life.2. Bidirectional metal hard seal: The butterfly plate and the welded hard alloy valve seat form a wedge-shaped compression seal, which can withstand high pressure, high temperature, and corrosive media, and is suitable for bidirectional flow conditions.3. High welding connection strength: The valve body is directly welded to the pipeline, with high connection strength and absolutely reliable sealing, suitable for high-pressure pipelines and flammable, explosive, and toxic medium systems.4. Small opening and closing torque, easy operation: The eccentric structure reduces friction, and the 90 ° rotation operation torque is small, which can be adapted to various driving modes such as manual, electric, and pneumatic.5. Excellent resistance to high temperature and high pressure: The metal hard seal structure can adapt to high temperatures and higher pressures (such as PN16~PN100 or higher) up to 600 ℃, with stable performance.6. Long service life and easy maintenance: The sealing surface is wear-resistant and corrosion-resistant, and there is no friction or wear during the opening and closing process. After long-term use, the sealing performance can still be maintained, and the maintenance cycle is long.7. Widely applicable in various fields: suitable for high temperature, high pressure, corrosive medium pipelines in industries such as petroleum, chemical, power, metallurgy, etc., especially suitable for cutting and regulating under harsh working conditions.

OverviewThe D373H wafer type hard seal butterfly valve is a valve that achieves opening, closing, and fluid flow regulation through the rotation of a high-strength metal disc around its fixed shaft (valve stem). The stem axis is positioned at the intersection of the disc sealing surface center and the pipeline channel centerline, with the disc being symmetrical on both sides. The valve features a wafer-type connection, meaning the valve body itself is flangeless. It is clamped directly between two pipeline flanges using stud bolts, enabling a compact installation. Both the disc and the valve seat sealing surfaces are designed with a matching pair of metal materials (Stainless Steel/Alloy Steel). The sealing surfaces are overlaid with hard alloy and precision ground, relying on the compression force generated by the disc rotation to achieve a hard seal. By rotating the stem 90° via a manual, electric, or pneumatic actuator, the valve enables rapid shut-off and flow control for pipelines carrying high-temperature, high-pressure, and corrosive media.D373H Wafer Type Hard Seal Butterfly Valve Product Drawing Features1、Compact Structure, Easy Installation: The wafer-type connection design features a short face-to-face dimension, small volume, and light weight. It is clamped directly between pipeline flanges without requiring its own flanges, significantly reducing installation space requirements and pipeline load costs.2、Quick Opening/Closing, Low Operating Torque: The disc achieves full opening or closing with a simple 90° rotation, making operation easy and fast. The precision-machined metal sealing pair has a low friction coefficient, requiring low operating torque and allowing compatibility with various drive modes such as manual, electric, and pneumatic.3、Hard Seal Design, High Temperature and Pressure Resistance: The sealing surfaces of both the seat and the disc are made of metal materials (stainless steel/alloy steel) overlaid with hard alloy and precision-lapped. This design withstands high temperatures up to 425°C and high-pressure conditions, making it suitable for demanding media like steam and hot oil.4、Low Fluid Resistance, Significant Energy Saving: The disc features a streamlined design. In the fully open position, it occupies almost no space in the flow path, allowing media flow close to a straight pipe condition with minimal pressure loss. This is particularly suitable for pipeline systems with large flow rates and high flow velocities.5、Reliable Sealing Performance, Long Service Life: The metal sealing pair offers excellent wear resistance and erosion resistance. Combined with a properly designed specific sealing pressure, it achieves tight and reliable shut-off sealing (conforming to API 598 standards). The valve body is made of high-strength materials, effectively resisting thermal stress deformation and ensuring long-term stable operation.6、Wide Applicability: The valve body can be made from various materials such as carbon steel, stainless steel, and alloy steel. It is suitable for industrial fluids including water, steam, oil, corrosive media, and high-temperature gases. It is widely used in applications requiring media shut-off or regulation in industries such as petroleum, chemical, metallurgy, power, and thermal piping networks.

OverviewThe D343Y Stainless Steel Triple Eccentric Hard Seal Butterfly Valve is a valve that achieves opening, closing, and flow regulation through the rotation of a high-strength stainless steel disc around its fixed axis (valve stem). Its design features a "triple eccentric" structure, meaning the valve stem axis is offset from the center of the disc sealing surface, the centerline of the pipeline, and the center of the valve body. This allows the disc to instantly disengage from or press against the valve seat during opening and closing, completely eliminating friction and binding between the sealing surfaces. The valve adopts a flanged connection for convenient installation and disassembly. Both the disc and valve seat sealing surfaces are made of metallic materials (stainless steel against stainless steel) and are precision-lapped. Relying on the cam effect generated by the triple eccentric structure, the valve achieves a reliable sealing action that tightens as the valve closes. This valve can be operated manually, electrically, or pneumatically, rotating the stem 90° to achieve tight shut-off and precise control in pipelines handling high-temperature, high-pressure, and corrosive media.D343Y Stainless Steel Triple Eccentric Hard Seal Butterfly Valve product image 特点1、三偏心零摩擦结构： 采用创新的三偏心设计（轴向偏心、径向偏心、角偏心），使蝶板在启闭旋转过程中，密封面在瞬间脱离或接触阀座，完全消除了传统蝶阀密封副之间的机械摩擦与卡挤，大幅延长了阀门使用寿命，并确保启闭扭矩轻便。2、硬密封耐高温： 蝶板与阀座密封面均采用不锈钢金属材料（堆焊或整体合金），并经高精度研磨抛光。该设计使其能够耐受高达600℃以上的高温工况，适用于蒸汽、热油及高温烟气等严苛介质。3、越关越紧的可靠密封： 利用三偏心结构产生的凸轮效应，在阀门关闭时，蝶板密封圈与阀座之间产生自锁式压紧力，实现金属对金属的零泄漏密封（符合API 598标准），且密封性能随介质压力升高而增强。4、流线型流道，低流阻： 阀体流道设计平滑流畅，蝶板在完全开启状态下几乎不占据流道空间，介质流动接近直通管状态，流体阻力极小，压力损失小，适合高流速和大流量工况。5、耐腐蚀与长寿命： 阀体主体采用优质不锈钢（如CF8、CF8M、CF3等）铸造，具备优异的抗腐蚀性能。高硬度的金属密封副耐磨、耐冲蚀，确保了阀门在腐蚀性、颗粒性介质中的长期稳定运行。6、广泛的高端工况适应性： 产品可设计为软密封（对温度要求不高时可选配软密封圈）与硬密封双重结构，但主体为硬密封。适用于石油、化工、电力、冶金、制药以及高温空气、煤气、油气混合等苛刻管路系统，作为调节或截流装置使用。Features1、Triple Eccentric Zero-Friction Design: Employs an innovative triple eccentric design (axial offset, radial offset, angular offset). This ensures the sealing surfaces instantly disengage from or contact the valve seat during the disc's opening and closing rotation, completely eliminating the mechanical friction and binding found in traditional butterfly valve sealing pairs. This significantly extends the valve's service life and ensures light operating torque.2、Hard Seal for High-Temperature Resistance: Both the disc and valve seat sealing surfaces are made of stainless steel metal materials (hardfaced or solid alloy) and are precision ground and polished. This design enables the valve to withstand high-temperature conditions up to 600°C and above, making it suitable for demanding media such as steam, thermal oil, and high-temperature flue gas.3、Reliable Tighter-as-It-Closes Seal: Utilizes the cam effect generated by the triple eccentric design. As the valve closes, a self-locking compression force develops between the disc seal and the valve seat, achieving a metal-to-metal zero-leakage seal (conforming to API 598 standards). The sealing performance enhances as the medium pressure increases.4、Streamlined Flow Path, Low Flow Resistance: The valve body features a smoothly designed flow path. When fully open, the disc occupies minimal space within the flow path, allowing the medium to flow almost as through a straight pipe. This results in extremely low fluid resistance and minimal pressure loss, making it ideal for high-velocity and high-flow applications.5、Corrosion Resistance and Long Service Life: The main valve body is cast from high-quality stainless steel (such as CF8, CF8M, CF3, etc.), providing excellent corrosion resistance. The high-hardness metal sealing pair is resistant to wear and erosion, ensuring long-term stable operation in corrosive or particulate-laden media.6、Broad Suitability for Demanding Applications: While primarily a hard-seal valve, the product can be designed with a dual soft-seal (optional soft seal ring when temperature requirements are lower) and hard-seal structure. It is widely applicable in demanding pipeline systems such as those in petroleum, chemical, power, metallurgy, pharmaceutical industries, as well as for high-temperature air, gas, oil-gas mixtures, serving as a regulating or shut-off device.

OverviewD341W ventilation butterfly valve is a valve that opens, closes, and regulates gas channels by rotating a disc-shaped butterfly plate around its fixed axis (valve stem). The axis of its valve stem is usually designed with a center or eccentricity perpendicular to the plate surface, and the butterfly plate structure is determined according to the working conditions. The valve adopts a flange connection, which means that the valve body comes with a flange and is directly connected to the pipeline flange through bolts. Butterfly plate sealing usually adopts metal sealing or non sealed design, and the valve seat can be a body welding or embedded structure, suitable for controlling the flow of low-pressure gas media. This valve is driven by a manual, electric, or pneumatic device to rotate the valve stem, typically 90 degrees, to control the flow of air in the ventilation network. D341W ventilation butterfly valve product diagram feature1. Sturdy structure and strong applicability: adopting flange connection, the valve body structure is relatively stable, which can better withstand pipeline stress and slight vibration, suitable for gas pipeline systems such as ventilation, dust removal, and environmental control.2. Flexible opening and closing, good adjustment performance: the butterfly plate can be quickly opened and closed by rotating 90 °, and the operation is simple. By controlling the opening of the butterfly plate, it is easy to adjust the gas flow rate linearly or approximately linearly.3. Low fluid resistance: When fully open, the thickness of the butterfly plate is the main resistance of the medium flow channel, and the shape of the channel is approximately circular, so it has less obstruction to gas flow and lower pressure drop, which is conducive to energy conservation.4. There are various forms of sealing: usually using metal (such as stainless steel) sealing or non sealed design. For ventilation environments with lower requirements, non sealed structures can be used to reduce costs; For situations that require a certain degree of sealing, specially designed metal seals or soft hard composite sealing structures can be used.5. Relatively easy to maintain and wear-resistant: The valve structure is relatively simple, and key components such as valve stem and bearing seat are easy to maintain and replace. Its sealing structure design (especially metal sealing) usually has good wear resistance and erosion resistance, and is suitable for gas media containing dust or particles.6. Specialized use: Designed specifically for the flow control of gas media such as air, flue gas, coal gas, dusty gases, etc. The valve body material is often carbon steel, stainless steel, etc. The butterfly plate can be made of carbon steel, stainless steel, or coated with wear-resistant and corrosion-resistant coatings, and is widely used in ventilation and environmental protection systems in industries such as metallurgy, building materials, chemical engineering, and power.