I. Product Overview & Core Specifications
The TIANYU pneumatic actuated diaphragm valve represents a precision-engineered fluid control solution tailored for industrial process systems, designed to deliver reliable isolation and flow regulation in applications demanding zero leakage, corrosion resistance, and compatibility with abrasive or corrosive media. With a nominal diameter of DN40, this valve is optimized for medium-flow pipeline systems, offering a compact footprint while maintaining robust performance characteristics. Rated for a pressure class of PN10, it operates reliably at pressures up to 1.0 MPa, making it ideal for low-to-medium pressure applications in water treatment, chemical processing, and pharmaceutical manufacturing.
The valve body is constructed from WCB carbon steel, a material selected for its exceptional mechanical strength, impact resistance, and cost-effectiveness. Conforming to ASTM A216 standards, WCB exhibits a minimum tensile strength of 485 MPa and excellent ductility, enabling it to withstand cyclic pressure fluctuations, thermal shocks, and abrasive wear from particulate-laden fluids. This material choice ensures the valve maintains structural integrity over extended service life, even in harsh outdoor or industrial operating environments, while its weldability simplifies installation and retrofitting into existing pipeline systems.
Complementing the robust body, the valve seat and diaphragm are fabricated from EPDM (Ethylene Propylene Diene Monomer), a high-performance elastomer renowned for its exceptional chemical resistance, thermal stability, and sealing capabilities. EPDM resists degradation from water, steam, mild acids, alkalis, and a wide range of industrial chemicals, making it suitable for contact with potable water, wastewater, and non-oil-based process fluids. The soft-seated design achieves bubble-tight shutoff compliant with EN 12266 Class A, minimizing leakage to prevent product loss, environmental contamination, and safety hazards, while the diaphragm’s flexible structure enables precise flow modulation across the entire operating range.
For seamless integration into pipeline systems, the valve features a flanged connection design compliant with EN 1092-1 and GB/T 9112-9124 standards. Flanged connections provide a secure, leak-proof interface, allowing for easy assembly and disassembly during maintenance or system upgrades. The standardized flange dimensions and bolt patterns ensure interoperability with global piping systems, reducing installation time and costs while ensuring compatibility with existing infrastructure.
Actuation is delivered by a robust pneumatic diaphragm actuator, designed to provide responsive, reliable control over valve positioning. The actuator utilizes compressed air to actuate the diaphragm, modulating flow between fully open and fully closed positions with precision. The integrated pneumatic control module includes a filter regulator, pressure gauge, and solenoid valve, enabling precise pressure regulation and remote control via automated systems. This pneumatic actuation eliminates the need for manual force, making it ideal for automated process systems and remote installations where manual operation is impractical. The actuator is equipped with fail-safe functionality, ensuring the valve returns to a pre-defined safe position (open or closed) in the event of air supply failure, enhancing operational safety and system reliability.
II. Design Features & Functional Advantages
The TIANYU DN40 PN10 pneumatic diaphragm valve incorporates innovative design elements that elevate its performance, reliability, and operational efficiency beyond conventional control valves, addressing the unique challenges of industrial fluid control applications.
At the core of its design is the diaphragm mechanism, which provides a hermetic seal between the process fluid and the actuator, eliminating the risk of fugitive emissions and cross-contamination. Unlike traditional valve designs that use stems or packing glands, the diaphragm acts as both the sealing element and the actuation interface, creating a completely isolated flow path that prevents fluid from contacting the actuator components. This design eliminates the need for stem packing, a common source of leakage and maintenance in other valve types, ensuring zero leakage across the entire operating pressure and temperature range.
The EPDM diaphragm and seat offer exceptional chemical resistance and flexibility, enabling the valve to handle a wide range of fluids, including abrasive slurries, corrosive chemicals, and viscous media. The diaphragm’s flexible structure allows it to conform to irregularities in the flow path, maintaining a tight seal even in the presence of particulate matter or debris, reducing the risk of clogging and extending maintenance intervals. The soft-seated design also minimizes turbulence and pressure drop, optimizing flow efficiency and reducing energy consumption in process systems.
The pneumatic actuator is engineered for precise control and reliability, featuring a large diaphragm area that delivers high thrust at low air pressures, ensuring smooth, consistent actuation even at low operating pressures. The integrated filter regulator removes moisture and contaminants from the compressed air supply, protecting the actuator components from wear and ensuring long-term performance. The pressure gauge provides real-time visibility of the air supply pressure, enabling operators to monitor system performance and identify potential issues before they impact valve operation. The solenoid valve allows for remote control and automation, integrating seamlessly with SCADA, DCS, and PLC systems for advanced process control.
The valve body features a streamlined, full-bore flow path that minimizes hydraulic resistance and pressure loss, optimizing flow efficiency and reducing energy consumption. The smooth internal geometry prevents debris accumulation, reducing the risk of clogging and ensuring consistent performance over time. The body’s compact design makes it suitable for installation in space-constrained environments, such as skid-mounted systems and modular process units, while its robust construction ensures resistance to vibration and mechanical shock.
Safety and environmental protection are integrated into every design detail, starting with the fail-safe actuator functionality. In the event of an air supply failure, the actuator automatically returns the valve to a pre-defined safe position, preventing the release of hazardous fluids and ensuring system stability. The hermetic diaphragm seal eliminates fugitive emissions, meeting strict environmental regulations for industrial process systems, while the WCB carbon steel body provides exceptional fire resistance, ensuring the valve maintains structural integrity in the event of a fire.
The valve’s modular design enables easy maintenance and component replacement, with the diaphragm and seat accessible without removing the valve from the pipeline. This reduces downtime and maintenance costs, making it an ideal choice for critical process systems where operational continuity is essential. The actuator is also modular, allowing for easy replacement of components such as the solenoid valve or filter regulator, further enhancing the valve’s maintainability and service life.
III. Manufacturing Process & Quality Assurance
The production of the TIANYU DN40 PN10 pneumatic diaphragm valve adheres to rigorous manufacturing processes and quality control protocols, ensuring each unit meets or exceeds industry standards and customer expectations.
Body Fabrication
The valve body is manufactured using a precision casting process, where WCB carbon steel is melted and poured into pre-formed molds to create the desired geometry. The casting process delivers exceptional dimensional accuracy and structural integrity, eliminating internal defects such as porosity or inclusions that could compromise performance. After casting, the body undergoes heat treatment, including normalization and tempering, to refine its microstructure and relieve internal stresses, ensuring consistent mechanical properties across the component. The body is then machined to precise dimensions using CNC lathes and milling machines, with critical surfaces such as flange faces and diaphragm seats finished to a roughness of Ra ≤ 3.2 μm to ensure proper sealing and alignment.
Diaphragm & Seat Production
The EPDM diaphragm and seat are fabricated from high-grade EPDM elastomer, which is molded and cured under controlled conditions to ensure consistent mechanical properties and chemical resistance. The molding process uses precision dies to create the desired shape and thickness, ensuring the diaphragm’s flexibility and sealing performance. After molding, the diaphragm and seat undergo post-curing treatment to enhance their thermal stability and chemical resistance, followed by dimensional inspection to verify compliance with design specifications. Each diaphragm and seat undergoes leak testing to ensure it provides a hermetic seal, with no visible leakage under hydrostatic pressure.
Assembly & Testing
The valve assembly process is conducted in a controlled, clean environment to prevent contamination of internal components, with skilled technicians following detailed work instructions and quality checklists. The assembly process involves mounting the diaphragm and seat into the valve body, attaching the pneumatic actuator, and connecting the control module components (filter regulator, pressure gauge, solenoid valve). Critical assembly steps, such as diaphragm alignment and actuator mounting, are verified using precision measurement tools to ensure compliance with design specifications.
Before leaving the factory, each valve undergoes a comprehensive series of performance tests in accordance with EN 12266 and API 598 standards:
- Shell Test: A hydrostatic pressure test conducted at 1.5 times the rated pressure (1.5 MPa for PN10 valves) to verify the body’s structural integrity and resistance to leakage.
- Seat Test: A pneumatic pressure test conducted at 1.1 times the rated pressure to ensure the diaphragm and seat provide a bubble-tight seal under both forward and reverse flow conditions.
- Operational Test: A functional test of the pneumatic actuator to verify smooth opening, closing, and modulation, with accurate position feedback and fail-safe functionality.
- Cycle Test: A durability test involving repeated opening and closing cycles to verify the valve’s long-term performance and resistance to wear.
- Chemical Resistance Test: A specialized test to evaluate the diaphragm and seat’s resistance to the intended process fluids, ensuring they maintain their mechanical properties and sealing performance over extended service life.
Quality Management
TIANYU maintains an ISO 9001:2015 certified quality management system, governing all aspects of manufacturing from raw material procurement to final delivery. Raw materials, including WCB carbon steel and EPDM elastomer, are sourced from approved suppliers and undergo rigorous incoming inspection, including chemical analysis and mechanical testing, to ensure compliance with material specifications.
The company’s quality control laboratory is equipped with advanced testing equipment, including spectrometers, hardness testers, and pressure testing rigs, enabling real-time monitoring of material properties and product performance. A team of experienced quality assurance engineers conducts regular audits, process reviews, and non-destructive testing to identify and address potential issues before they impact product quality.
IV. Application Scenarios & Industry Relevance
The TIANYU DN40 PN10 pneumatic diaphragm valve is a versatile solution designed to meet the demands of a wide range of industrial applications where precise flow control, zero leakage, and chemical resistance are critical.
Water Treatment & Desalination
In water treatment and desalination plants, the valve is used to regulate the flow of raw water, treated water, and chemical additives, ensuring efficient operation of filtration, disinfection, and reverse osmosis (RO) systems. The EPDM diaphragm and seat resist corrosion from chlorinated water and seawater, while the hermetic seal eliminates the risk of contamination, ensuring the purity of treated water. The pneumatic actuation enables automated control, integrating with SCADA systems to adjust flow rates in real time based on water quality and demand, optimizing treatment efficiency and reducing operational costs.
Chemical Processing
In chemical processing plants, the valve is used to isolate and control the flow of corrosive chemicals, acids, alkalis, and solvents, ensuring safe handling and processing of hazardous materials. The EPDM diaphragm and seat offer exceptional chemical resistance, while the hermetic seal prevents the release of toxic or flammable fluids, enhancing workplace safety and environmental protection. The valve’s compact design makes it suitable for installation in chemical process skids and modular systems, while the pneumatic actuation enables precise flow modulation, ensuring consistent process conditions and product quality.
Pharmaceutical & Biotechnology
In pharmaceutical and biotechnology applications, the valve is used to regulate the flow of sterile fluids, buffers, and process chemicals, ensuring compliance with strict hygiene and quality standards. The EPDM diaphragm and seat are compatible with clean-in-place (CIP) and steam-in-place (SIP) processes, while the hermetic seal eliminates the risk of contamination, maintaining sterile conditions in production lines. The pneumatic actuation enables automated control, integrating with process control systems to adjust flow rates based on real-time process data, ensuring efficient production and product consistency.
Food & Beverage
In food and beverage manufacturing, the valve is used to regulate the flow of ingredients, additives, and cleaning solutions, ensuring compliance with food safety regulations. The EPDM diaphragm and seat are food-grade compliant, while the hermetic seal prevents the risk of contamination, ensuring the purity of food products. The valve’s smooth internal geometry prevents the accumulation of food residues, reducing the risk of bacterial growth and simplifying cleaning and maintenance. The pneumatic actuation enables automated control, integrating with production line systems to adjust flow rates in real time, optimizing production efficiency and product quality.
Mining & Mineral Processing
In mining and mineral processing plants, the valve is used to regulate the flow of abrasive slurries, tailings, and process water, ensuring efficient operation of ore processing and waste management systems. The WCB carbon steel body provides exceptional resistance to abrasion and wear, while the EPDM diaphragm and seat maintain a tight seal even in the presence of particulate matter, reducing the risk of clogging and extending maintenance intervals. The pneumatic actuation enables automated control, integrating with process control systems to adjust flow rates based on ore quality and processing requirements, optimizing resource utilization and reducing operational costs.
V. Compliance & Certification
The TIANYU DN40 PN10 pneumatic diaphragm valve is designed and manufactured in compliance with a comprehensive set of international and industry standards, ensuring safety, performance, and interoperability with global pipeline systems.
International Standards
- API 600: Specifies design, manufacturing, testing, and inspection requirements for industrial valves, ensuring structural integrity and performance in critical applications.
- EN 12516: Specifies design, manufacturing, and testing requirements for diaphragm valves, ensuring compliance with European standards for fluid control systems.
- EN 12266: Specifies pressure testing and inspection procedures for industrial valves, verifying leakage and performance criteria.
- EN 1092-1: Specifies dimensional requirements for flanged connections, ensuring compatibility with European pipeline systems.
- CE PED (2014/68/EU): Confirms compliance with the European Union’s Pressure Equipment Directive, enabling marketing and use within the European Economic Area (EEA).
- ISO 9001:2015: Validates TIANYU’s quality management system, ensuring consistent quality and continuous improvement in manufacturing processes.
Quality Certifications
TIANYU holds ISO 9001:2015 certification for its quality management system, demonstrating a commitment to consistent quality and customer satisfaction. The company also maintains ISO 14001 (environmental management) and ISO 45001 (occupational health and safety) certifications, ensuring sustainable and safe manufacturing processes.
These certifications and compliance with international standards provide customers with confidence in the valve’s performance, reliability, and safety, making it a trusted choice for critical industrial process systems worldwide.
The TIANYU DN40 PN10 pneumatic diaphragm valve delivers reliable, zero-leakage fluid control for industrial process systems, combining WCB carbon steel’s durability with EPDM’s chemical resistance. Its hermetic diaphragm design eliminates fugitive emissions, while pneumatic actuation enables precise, automated control. Certified to API, EN, and CE standards, and backed by ISO 9001 quality assurance, it excels in water treatment, chemical processing, and pharmaceutical applications, ensuring operational safety, regulatory compliance, and long-term value for critical process systems.