OverviewThe D371X-150LB American Standard Butterfly Valve is a wafer-type butterfly valve designed in accordance with the U.S. standard 150pound pressure rating. The valve controls fluid flow by rotating a disc 90° around the stem inside the valve body. Its centerline symmetrical design ensures uniform contact between the disc and seat. The disc sealing is typically achieved with rubber or elastic polymer materials, which form a bidirectional seal through compression deformation. This valve is widely used in industrial applications such as petroleum, chemical, and power industries, and is particularly suitable for fluid control in pipeline systems conforming to American standards (ANSI/ASME).Product Drawing of D371X-150LB American Standard Lug Type Butterfly Valve Features1、American Standard Pressure Rating: Strictly complies with ANSI/ASME B16.34 standard with a pressure rating of 150LB. Suitable for American standard pipeline systems, ensuring safety and reliability under corresponding operating conditions.2、Bidirectional Soft Seal Design: Utilizes elastic soft materials such as rubber or PTFE as the sealing ring. Bidirectional sealing is achieved by compression during disc rotation, offering low leakage in the closed state and excellent sealing performance.3、Compact Wafer-Type Structure: Adopts a wafer-type connection, featuring short face-to-face dimensions, small volume, and light weight. Facilitates installation in confined spaces, making it especially suitable for retrofit projects or densely arranged piping.4、Smooth and Flexible Operation: Can be equipped with a handle, worm gear, or pneumatic/electric actuator. Manual operation allows quick opening and closing—90° rotation completes full open or close—with low required operating torque.5、Corrosion-Resistant Material Options: The valve body can be made from materials such as cast steel or stainless steel. The lining and disc can be selected from different anti-corrosion materials according to medium characteristics, making it suitable for water, oils, gases, and mildly corrosive media.6、Easy and Economical Maintenance: Simple in structure, easy to disassemble, with straightforward replacement of wear-prone parts (e.g., sealing rings), resulting in low maintenance costs and a long service life.

OverviewD341F46 cast steel flange lined fluorine butterfly valve is a valve that opens, closes, and regulates fluid channels by rotating a disc-shaped butterfly plate around its fixed shaft (valve stem). The axis of its valve stem deviates from the center of the butterfly plate sealing surface, and adopts a "single eccentricity" or more complex structural design, with asymmetric sides on both sides of the butterfly plate. The valve adopts a flange connection, which means that the valve body has standard flanges at both ends and is directly fastened to the pipeline flange through bolts. The surface of the butterfly plate and the inner cavity of the valve body are lined with fluoroplastic (such as F46, also known as perfluoroethylene propylene FEP) as the sealing surface and anti-corrosion layer, and the butterfly plate is used to rotate and press the fluorine lined valve seat to achieve sealing. This valve is driven by manual, electric, or pneumatic devices to rotate the valve stem by 90 ° or less, achieving reliable on/off and flow control for highly corrosive and other harsh media fluids.D341F46 cast steel flange lined fluorine butterfly valve product diagram feature1. Durable and sturdy structure: The valve body is made of cast steel and connected to standard flanges, with high structural strength and good rigidity, suitable for pipeline systems that require mechanical strength.2. Flexible and controllable opening and closing: The butterfly plate can be fully opened or closed by rotating 90 °, and with the help of worm gear and other driving devices, it can operate smoothly and achieve flow regulation and rapid cutting.3. Low fluid resistance: When the butterfly plate is in the fully open position, the medium flow channel is smooth, and the butterfly plate has less obstruction to the fluid, resulting in lower pressure loss.4. Excellent sealing performance and outstanding anti-corrosion: Adopting eccentric structure combined with integral fluorine lining design, F46 (perfluoroalkoxy) lining layer covers all overcurrent surfaces, providing excellent corrosion resistance and effectively sealing strong corrosive media such as acid, alkali and salt.5. Easy maintenance and long service life: The fluorine lining layer is integrally formed, effectively preventing the medium from corroding the valve body and reducing maintenance requirements. The flange connection method is easy to install and disassemble.6. Specific Application: Designed specifically for media with strong corrosiveness, high purity, or harsh working conditions, it is widely used in acid, alkali, salt, organic solvent, and high-purity medium transportation pipelines in industries such as chemical, pharmaceutical, smelting, environmental protection, and electronics.

OverviewThe D341X Gear-Operated Flanged Butterfly Valve is a valve designed with flanged connections, utilizing a worm gear mechanism to drive the disc through a 90° rotation for opening, closing, and flow regulation. The centerline design of the valve body ensures uniform contact between the disc sealing surface and the seat, achieving bidirectional sealing through the compression deformation of a rubber or elastic polymer disc seal ring (or seat seal ring). The gear-operated transmission device (commonly referred to as a gearbox) amplifies manual operating torque, enabling smooth operation even for large-diameter valves. It also features a self-locking function to maintain the disc securely at any opening position. This valve is widely used for fluid pipeline control in industries such as water treatment, HVAC, water supply and drainage, energy, and chemical processing.Product Illustration of D341X turbine flange butterfly valveFeatures1、Gear-Driven Operation with Low Effort: Utilizing a precision worm gear reduction mechanism, the valve delivers high output torque, enabling smooth and effortless opening and closing. It is particularly suitable for manual operation in pipelines with diameters above DN200. The integrated mechanical self-locking function prevents disc displacement caused by medium impact.2、Compact Structure and Excellent Flow Characteristics: Designed with a centerline symmetrical construction and short face-to-face dimensions, the valve occupies minimal space. When fully open, the disc offers low resistance to flow, with the passage approximating the inner diameter of the pipeline, resulting in minimal pressure loss.3、Bidirectional Sealing with Reliable Performance: The valve seat typically features an integral rubber or composite soft-seal structure, which closely mates with the disc edge. By rotating the disc to compress the sealing ring, the valve achieves bidirectional (or unidirectional, depending on design) zero-leakage sealing, providing excellent shut-off performance when closed.4、Corrosion Resistance and Long Service Life: The interior and exterior surfaces of the valve body can be treated with anti-corrosion coatings such as epoxy resin. Key components, including the stem and worm gear, are manufactured from stainless steel or copper alloy, offering strong corrosion resistance and suitability for various water qualities and mildly corrosive media.5、Flanged Connection for Secure Installation: Designed with standard flanged ends, the valve ensures easy alignment with pipeline flanges, high connection strength, and reliable sealing. It is convenient for installation and removal within existing piping systems.6、Versatility and Expandability: The gear operator can be easily detached and replaced with electric or pneumatic actuators, enabling remote automatic control to meet the requirements of automated pipeline systems.

OverviewThe D71X Wafer-Type Centerline Butterfly Valve is a valve that controls the opening, closing, and regulation of fluid flow by rotating a disc-shaped butterfly plate around its fixed shaft (valve stem). The axis of the valve stem is located at the "centerline" position, where the sealing surface of the butterfly plate intersects with the centerline of the pipeline channel, ensuring symmetrical design on both sides of the butterfly plate. The valve features a wafer-type connection, meaning the valve body itself is flangeless and is clamped between two pipeline flanges using double-ended bolts. The sealing ring of the butterfly plate is typically made of elastic materials such as rubber and is directly embedded in the valve body or the inner ring of a pressure plate, achieving sealing by compressing the ring during butterfly plate rotation. The valve is operated manually, electrically, or pneumatically, driving the valve stem to rotate 90 degrees or less for rapid control of fluid flow, including on/off functions and flow regulation. D71X Wafer-Type Centerline Butterfly ValveFeatures1、Compact and Lightweight Design: The wafer-type construction ensures a short face-to-face dimension, small volume, and reduced weight, making it particularly suitable for piping systems with limited installation space.2、Quick and Easy Operation: A 90° rotation of the disc completes the full opening or closing cycle, offering simple and rapid actuation with low operating torque.3、Low Fluid Resistance: When fully open, the disc creates minimal obstruction to the flow, resembling a straight pipe section, resulting in low pressure loss.4、Excellent Sealing Performance: The centerline sealing structure utilizes a resilient soft seat that fits tightly against the disc edge, providing effective bidirectional sealing (or unidirectional sealing, depending on the specific design), especially suitable for normal/low temperature and low-to-medium pressure applications.5、Easy Maintenance and Cost-Effectiveness: With a simple structure and fewer components, disassembly and replacement are relatively straightforward. Compared to other valves of the same diameter, it generally offers advantages in both manufacturing and installation costs.6、Wide Range of Applications: The valve body can be made from materials such as cast iron, ductile iron, or stainless steel, while the lining and disc may be selected from various corrosion-resistant materials or coatings. This versatility enables its use in pipelines handling liquids or gases across numerous industries, including water treatment, HVAC, water supply and drainage, gas, power, and chemical processing.

OverviewThe D371X Worm Gear Operated Wafer Butterfly Valve is a valve that controls pipeline fluid flow through the rotational movement of its disc. Featuring a wafer-type connection design, the valve body is directly clamped between pipeline flanges via bolts, resulting in a compact structure. The drive mechanism employs a worm gear assembly, where rotation of the handwheel drives the worm inside the gearbox, which in turn rotates the worm wheel and valve stem. This motion causes the disc mounted on the stem to turn within a 90° range, thereby regulating medium flow. The sealing surface of the disc is typically made of rubber or other elastic materials, forming a soft seal with the valve seat to ensure tightness in the closed position. The D371X butterfly valve operates with low effort and rapid opening/closing, making it widely used in water treatment, HVAC, fire protection, and industrial piping systems.Product Illustration of D371X Worm Gear Operated Wafer Butterfly ValveFeatures1、Worm Gear Drive Design: Utilizes a worm gear reduction mechanism that requires low operating torque for efficient, laborsaving operation. It enables precise valve adjustment and provides a selflocking function to prevent unintended operation.2、Compact WaferType Structure: The valve body features a wafertype connection, offering small volume and light weight. This saves installation space and facilitates mounting and maintenance in confined locations.3、Reliable Soft Seal: The disc seal is made of highquality rubber or polymer material, which provides excellent elasticity and superior sealing performance. Zero leakage can be achieved when closed, making it suitable for a wide range of media.4、Low Flow Resistance: When fully open, the disc aligns parallel with the flow direction, creating a smooth flow passage with minimal fluid resistance. This helps reduce energy consumption in the system.5、CorrosionResistant and Durable: The internal and external surfaces of the valve body can be treated with epoxy coating or plating. Critical components such as the stem and disc are made of stainless steel or copper alloy, offering strong corrosion resistance and extended service life.6、Flexible MultiDirectional Installation: The valve can be installed either horizontally or vertically, with no restriction on medium flow direction, ensuring high adaptability. The worm gear box can be adjusted to different angles for convenient field operation.7、Easy Maintenance: The simplified structural design allows for easy disassembly and assembly. Sealing elements can be replaced quickly, minimizing maintenance costs and downtime.

OverviewThe D71X lug-type fire butterfly valve is a valve that opens, closes, and regulates fluid flow by rotating a disc around its fixed shaft (stem). Its stem axis is also located at the "center line" where the center of the disc sealing surface intersects with the centerline of the pipeline passage, with the disc being symmetrical on both sides. The valve adopts a lug-type connection, meaning the valve body is designed with raised lugs containing threaded holes, allowing the valve to be secured between pipeline flanges using single-end bolts, and it can also be used as a pipe-end valve. The disc sealing ring is typically made of elastic materials such as rubber, directly embedded in the inner groove of the valve body or retainer plate, achieving sealing by the disc rotating and compressing the sealing ring. The valve can be driven manually, electrically, or pneumatically to rotate the stem by 90° or less, enabling quick control of fluid on/off and flow regulation. It is particularly suitable for fire protection systems and pipeline conditions requiring independent disassembly and maintenance. D71X Lug Type Fire Butterfly Valve Product Drawing Features:1.Compact structure with end-of-line installation capability: The lug-type design features a valve body with raised lugs containing threaded holes, offering short structural length, small volume, and light weight. It is not only suitable for pipeline systems with limited installation space but can also be used independently as a pipe-end valve without the need for additional flanges or spool pieces.2.Quick and convenient opening/closing: The disc rotates 90° to achieve full open or full close, providing simple and fast operation with low operating torque, facilitating manual or automatic actuation.3.Low fluid resistance: When the disc is fully open, the media flow path is nearly a straight pipe, with minimal obstruction from the disc, resulting in low pressure loss and significant energy saving.4.Good sealing performance: The center-line sealing structure allows the elastic soft sealing ring to closely contact the disc edge, achieving effective bidirectional sealing (or unidirectional sealing depending on specific design). It is particularly suitable for fire protection systems, water supply and drainage, and other normal temperature, normal pressure, or medium-low pressure conditions. Additionally, the lug-type connection enables online independent replacement of the valve without affecting the entire pipeline.5.Easy maintenance and cost-effective: Simple structure with few components. The lug-type design allows independent valve disassembly, making inspection and replacement more convenient without removing adjacent pipes. Compared to other valves of the same size, manufacturing and installation costs are generally more advantageous.6.Wide application, suitable for fire protection and industrial pipelines: The valve body can be made of various materials such as ductile iron and stainless steel, while the lining and disc can also be selected with different anti-corrosion materials or coatings. Widely used in fire protection systems, water treatment, air conditioning, water supply and drainage, chemical industry, and other liquid/gas media pipelines, especially meeting the fire protection code requirements for pipe-end valves and reliability.

OverviewThe D371X wafer type fire signal butterfly valve is a valve that opens, closes, or regulates pipeline fluid through the rotary motion of the disc, while integrating a signal feedback function. The valve adopts a wafer-type connection design, with the valve body directly clamped between pipeline flanges using bolts, offering a compact structure and light weight. Its transmission method is a worm gear mechanism, where the handwheel drives the worm inside the gearbox, which in turn drives the worm wheel and stem to rotate, causing the disc fixed on the stem to rotate within a 90° range, thereby controlling the medium flow. The disc sealing surface is typically made of rubber or other elastic materials, forming a soft seal with the valve seat to ensure tightness when closed. The valve is equipped with micro switches or signal devices integrated into the worm gearbox. When the disc reaches the fully open or fully closed position, it can output passive contact signals to achieve linkage alarm or status indication with the fire control center. The D371X wafer type fire signal butterfly valve is labor-saving to operate, quick to open and close, and is widely used in automatic sprinkler systems, fire hydrant systems, water treatment, and industrial pipeline systems. D371X Wafer Type Fire Signal Butterfly Valve Product DrawingFeatures1. Worm Gear Drive Design: Adopts a worm gear reduction mechanism with low operating torque, labor-saving and efficient, enabling precise adjustment and self-locking to prevent misoperation. Integrated signal feedback device provides passive contact signals when the disc is fully open or fully closed, facilitating real-time valve status monitoring by the fire control center.2. Wafer Compact Structure: Wafer-type connection design with small size and light weight, saving installation space and facilitating installation and maintenance in confined areas. Signal device is integrated into the worm gearbox without occupying additional space.3. Reliable Soft Seal: Disc sealing ring made of high-quality rubber or polymer material with good elasticity and excellent sealing performance, achieving zero leakage when closed and suitable for various media. The sealing surface can be replaced after wear, extending valve service life. 4. Low Flow Resistance Coefficient: When fully open, the disc is parallel to the medium flow direction, providing a smooth flow path with low fluid resistance, helping to reduce system energy consumption and meeting the rapid response requirements of fire protection systems.5. Corrosion Resistant and Durable: Internal and external surfaces of the valve body can be treated with epoxy coating or plating. Key components such as stem and disc are made of stainless steel or copper alloy, offering strong corrosion resistance and long service life, suitable for fire water, seawater, and mildly corrosive media.6. Reliable Signal Feedback: Built-in micro switch or proximity switch with sensitive action and high contact capacity, supporting normally open/normally closed signal output. Can interface with fire alarm hosts and PLC systems for remote monitoring and fault alarm.7. Flexible Multi-Directional Installation: Valve can be installed horizontally or vertically without being restricted by medium flow direction, offering strong adaptability. The worm gearbox angle can be adjusted (typically 90° or 180° adjustable) for convenient on-site operation and signal cable routing.8. Easy Maintenance: Simplified structural design with convenient disassembly and assembly. Sealing elements and signal switches can be replaced quickly, reducing maintenance costs and downtime. Grease injection port on the worm gearbox facilitates regular lubrication.

OverviewThe D341X flanged fire butterfly valve is a valve that uses flanged connections and a worm gear transmission mechanism to drive the disc in a 90° rotation for opening/closing and flow regulation. The valve body features a concentric or eccentric design (typically concentric), ensuring uniform contact between the disc sealing surface and the valve seat. The integrally coated or lined rubber valve seat (made of aging-resistant elastic materials such as EPDM, NBR, etc.) deforms under pressure to form reliable bidirectional sealing. The worm gear transmission device (worm gearbox) amplifies the manual operating torque, enabling easy opening and closing of large-diameter valves, and provides a self-locking function to stably maintain the disc at any opening position. Due to its compact structure, low flow resistance, and reliable sealing, this valve is widely used for fluid pipeline control in fire protection water systems, water treatment, water supply and drainage, HVAC, and other applications.D341X Flanged Fire Butterfly Valve Product DrawingFeatures1. Worm gear drive for labor-saving operation: Adopts a precision worm gear reduction mechanism with high output torque, making opening and closing light and effortless, especially suitable for manual operation of DN200 and above, and features a mechanical self-locking function to prevent the disc from shifting due to medium impact.2. Compact structure with good flow characteristics: Concentric symmetrical design with short structural length and small footprint. When fully open, the disc offers low flow resistance, the flow path approximates the pipe inner diameter, and pressure loss is low.3. Bidirectional sealing for reliable performance: The valve seat typically adopts an integral rubber or composite soft sealing structure, precisely fitting the disc edge. By rotating the disc to compress the sealing ring, bidirectional zero-leakage sealing is achieved, with excellent sealing performance when closed.4. Corrosion resistance and long service life: The internal and external surfaces of the valve body can be treated with anti-corrosion coatings such as epoxy spraying. Key components like the stem and worm gear are made of stainless steel or copper alloy, offering good corrosion resistance and suitability for various water qualities and mildly corrosive media.5. Flanged connection for stable installation: Uses standard flanged connection for easy alignment with pipeline flanges, high connection strength, reliable sealing, and convenient installation and removal on existing pipelines.6. Versatility and expandability: The worm gear drive head can be easily disassembled and replaced with electric or pneumatic actuators to achieve remote automatic control, meeting the needs of automated pipelines.

OverviewThe D81X manual grooved soft-sealing butterfly valve is a valve that opens, closes, and regulates fluid flow by rotating a disc-shaped butterfly plate around its fixed axis (valve stem). Its valve stem axis is located at the centerline position where the sealing surface center of the butterfly plate intersects with the centerline of the pipeline channel, with the butterfly plate being symmetrical on both sides. The valve adopts a grooved connection method, meaning there are no flanges at both ends of the valve body. Instead, standard grooves are machined on the outer circumference of the valve body. The valve is rigidly locked to the grooved pipeline using matching clamps, requiring no welding or flange bolts, offering fast installation and easy alignment. The butterfly plate sealing ring is typically made of elastic materials such as EPDM, which is directly vulcanized or embedded onto the butterfly plate or valve body. During opening and closing, the rotation of the butterfly plate compresses and deforms the sealing ring to achieve zero-leakage sealing. The valve is driven by a manual worm gear or handle to rotate the valve stem by 90 degrees or less, allowing rapid control of the flow of non-corrosive fluids such as water and firefighting foam concentrate. It is widely used in pipeline systems such as building fire protection, water supply and drainage, air conditioning circulating water, and industrial cooling water.D81X Manual Grooved Soft-sealing Butterfly Valve Product ImageFeatures1. D81X Manual Grooved Soft-Sealing Butterfly Valve Convenient Installation and MaintenanceThe D81X manual grooved soft-sealing butterfly valve adopts grooved clamp connection, requiring no welding or flange bolts. Pipeline connection can be completed by mechanical assembly only, with installation speed several times higher than traditional flange connection. The clamp connection occupies about 70% of the space required by flanges and uses fewer bolts, making it especially suitable for installation sites with limited space or where open flames are prohibited. The overall structure is simple with few components, making disassembly and replacement easy, and maintenance cost economical.2. D81X Manual Grooved Soft-Sealing Butterfly Valve Compact and Lightweight StructureThe D81X manual grooved soft-sealing butterfly valve body is made of ductile iron (QT450-10), featuring high strength and light weight. The wafer-type grooved structure design gives the valve small volume and short structural length. Compared with flange butterfly valves of the same diameter, the weight is significantly reduced, making it suitable for large-diameter valves and convenient for transportation and installation.3. D81X Manual Grooved Soft-Sealing Butterfly Valve Quick and Light OperationThe D81X manual grooved soft-sealing butterfly valve completes full opening or full closing by rotating the butterfly plate 90 degrees, with simple and fast operation. The centerline sealing structure design provides low operating torque, making opening and closing light and effortless. The handle has a switch positioning self-locking function, enabling locking at full open, partial open, and closed positions to prevent misoperation.4. D81X Manual Grooved Soft-Sealing Butterfly Valve Reliable Sealing PerformanceThe D81X manual grooved soft-sealing butterfly valve adopts a high elasticity EPDM rubber valve seat with a rubber content as high as 50% and tensile strength of 16.1MPa. The unique C-shaped rubber sealing ring design achieves triple sealing effect, maintaining zero leakage after more than 10,000 simulated opening and closing cycle tests. The valve adopts a bidirectional sealing design, eliminating the need to consider medium flow direction during installation and offering flexible use.5. D81X Manual Grooved Soft-Sealing Butterfly Valve Low Fluid ResistanceFor the D81X manual grooved soft-sealing butterfly valve, the opening and closing butterfly plate is designed in a streamlined shape. When fully open, the butterfly plate aligns with the fluid direction, and the medium flow path is approximately a straight pipe. The valve bore is essentially the same diameter as the pipeline inner diameter, and the butterfly plate creates minimal obstruction to fluid flow, resulting in large flow capacity and low pressure loss.6. D81X Manual Grooved Soft-Sealing Butterfly Valve Excellent Corrosion Resistance and DurabilityThe inner cavity and outer surface of the D81X manual grooved soft-sealing butterfly valve body are coated with non-toxic epoxy coating, effectively preventing corrosion and erosion from various corrosive media, ensuring long service life. The valve shaft adopts a blow-out proof design with a snap ring groove at the upper end, preventing the valve shaft from blowing out during use and improving safety. The valve shaft seal adopts a combined structure of an oil-free bearing and packing, achieving a self-sealing function.7. D81X Manual Grooved Soft-Sealing Butterfly Valve Wide Application RangeThe D81X manual grooved soft-sealing butterfly valve body can be made of various materials such as ductile iron and stainless steel, and the sealing ring can be made of different materials including EPDM, NBR, and silicone rubber. Nominal pressure covers PN10, PN16 and other grades. Applicable media include water, firefighting foam concentrate, oil products, air, etc. It is widely used in pipeline engineering fields such as water supply and drainage, fire protection, air conditioning, gas, petroleum, chemical industry, water treatment, municipal engineering, and shipbuilding.

OverviewThe D381X turbine grooved signal butterfly valve is a grooved-connected signal valve that adopts worm gear transmission. Its body is made of ductile iron, and the disc features a fully rubber-covered design. The valve is opened and closed by the worm gear reduction mechanism driving the stem to rotate 90°. A micro-switch type signal device is integrated into the valve. When the cam rotates with the worm gear to a preset position, it trips the contacts on the signal device, thereby outputting an "ON" or "OFF" electrical signal to indicate and feed back the open/close status of the butterfly valve. The valve is mainly connected to pipelines by grooved clamps, requiring no welding during installation. It is particularly suitable for applications such as fire sprinkler systems where remote monitoring of valve status is required.Product Image of D381X Turbine Grooved Signal Butterfly ValveFeatures1.Compact size and easy installation: Simple and compact structure, small volume, light weight, can be installed at any position on the pipeline. Adopting grooved clamp connection, no welding or secondary galvanizing required. Installation speed is faster than flange connection, and comprehensive installation cost can be saved by 30-50%.2.Effortless operation and quick opening/closing: Through worm gear transmission, the operating torque is small. The valve can be quickly opened and closed by rotating 90°, which is labor-saving and light.3.Stable and reliable signal feedback: Built-in micro-switch type signal device can output stable "ON/OFF" electrical signals as the valve opens and closes, enabling remote monitoring of valve status. The sensor has a long service life and stable signal transmission.4.Excellent sealing and long service life: Adopting high-elasticity EPDM rubber seat or fully rubber-covered disc, the sealing is reliable and can achieve zero leakage in gas tests. The number of opening and closing tests can reach tens of thousands of times, providing a long service life.5.Good adjustability and bidirectional flow: The valve flow characteristic tends to be linear, with good flow regulation performance. The direction of medium flow in the pipeline need not be considered during installation, allowing bidirectional flow.6.Strong adaptability and durable: The valve body is made of ductile iron (QT450), coated with powder epoxy resin, providing good corrosion resistance. Suitable for various media such as water and foam mixture, with an applicable temperature range of 0°C to 80°C.

OverviewThe D11X internal thread butterfly valve operates by rotating the disc around a fixed axis to open, close, and regulate fluid flow. It adopts a concentric symmetric structure, with the valve stem positioned at the intersection of the disc and the pipeline center. The connection type is grooved, with standard grooves machined at both ends of the valve body. The valve is secured using clamps, requiring no welding or flanges, enabling fast installation and easy alignment. The sealing ring is typically made of elastic materials such as EPDM, which is vulcanized or embedded onto the disc or valve body. Zero leakage is achieved through rotational compression and deformation of the seal. The valve is operated by a handle or worm gear, rotating 90° to quickly control non-corrosive media such as water and firefighting foam. It is widely used in fire protection, water supply and drainage, air conditioning, and industrial cooling water pipelines. Product Image of D11X Internal Thread Butterfly ValveFeatures1.Easy installation and maintenance: Internal thread connection allows direct screwing into the pipeline without flange welding. Small installation space and fewer bolts are required, making it especially suitable for confined spaces or no-fire sites. Simple structure with fewer parts results in low disassembly and maintenance costs.2.Compact and lightweight: The valve body is made of ductile cast iron (QT450-10), offering high strength and low weight. The threaded-end design ensures a small valve body size and short structural length. It is lighter and more portable than flanged butterfly valves of the same bore size, facilitating transportation and installation.3.Quick and easy operation: Rotating 90° fully opens or closes the valve, providing simple operation. The concentric sealing structure requires low torque, making opening and closing effortless. The handle has a self-locking position feature, allowing the valve to be locked in fully open, partially open, or closed positions to prevent misoperation.4.Reliable sealing performance: High-elasticity EPDM valve seat (rubber content 50%, tensile strength 16.1 MPa) with a C-ring design achieves triple sealing, remaining leak-free even after 10,000 opening/closing cycles. Bidirectional sealing design eliminates the need to consider medium flow direction during installation.5.Low fluid resistance: The disc is linear and aligns with the flow direction when fully open, making the flow path nearly a straight-through pipe. The valve bore is essentially the same diameter as the pipeline, resulting in minimal obstruction, high flow capacity, and low pressure loss.6.Good corrosion resistance and durability: Internal and external surfaces are coated with non-toxic epoxy paint, providing strong corrosion and erosion resistance. The valve shaft features a blow-out proof design (with a retaining ring groove) for high safety. The shaft seal combines oil-free bearings and packing to achieve self-sealing.7.Wide range of applications: The valve body can be selected from ductile cast iron, stainless steel, etc. The sealing ring can be made of EPDM, NBR, silicone rubber, etc. It is suitable for water, firefighting foam, oil, air, and other media, covering applications in water supply and drainage, fire protection, air conditioning, chemical engineering, municipal engineering, shipbuilding, and more.