Wuhan Grat Control Valve Co., Ltd.

Background Industrial refrigeration is critical to food cold-chain, chemical processes, warehousing and logistics. Core requirements are fail-safe refrigerant control and high energy-efficiency. Plant operators need a valve that will positively isolate oil-laden, two-phase refrigerant, withstand sub-zero duty and remain maintenance-free for years. GRAT’s split-body electric ball valve was engineered for these exact conditions; its superior shut-off performance and material compatibility make it the preferred choice for Freon service, improving system tightness and reducing energy consumption. Operating Conditions Industry: Industrial refrigeration Industry: Industrial refrigerationProduct: GRAT 2-Pieces Ball ValveMedium: Freon (gas/liquid) with oil carry-overOperation: On/OffBody material: CF8Ball / stem material: CF8Seat seal: PTFE + HNBR O-ringTemperature range: –30 °C … +60 °CDesign pressure: PN 16 (1.6 MPa)Commissioned: May 2013Design life: 5–8 yearsControl signal: AC 220 V Product Advantages & Features The GRAT split-body electric ball valve incorporates several design features specifically for refrigeration duty: Cryogenic sealing integrity – PTFE primary seal combined with low-temperature HNBR O-rings maintains bubble-tight shut-off at –30 °C. Corrosion-resistant construction – CF8 stainless steel body and trim resist attack from Freon and refrigeration oil. High-compatibility actuator – accepts standard AC 220 V on/off signal, includes built-in surge suppression; >100,000 cycle life. Compact, pressure-rated body – PN 16 pressure class, low installation footprint, easy system integration. Low cost of ownership – modular cartridge design allows rapid seal replacement, minimising downtime. Performance Results Since commissioning in May 2013, GRAT valves have been operating in numerous industrial refrigeration plants: Service life exceeds specification – many valves have passed the 8-year design life; the longest uninterrupted run is 10 years with zero parts replacement. Zero external leakage – maintains tight shut-off under standard conditions, cutting refrigerant losses and improving system COP by 3–5%. Extended maintenance intervals – maintenance cycles are >2× longer than those of comparable butterfly or globe valves, reducing maintenance cost by ~40%. Strong customer acceptance – specified by major cold-chain logistics and chemical refrigeration projects in China; repeat-purchase rate >90%. For ten years GRAT split-body electric ball valves have supported China’s refrigeration sector. During this decade we have witnessed domestic industrial control equipment evolve from follower to leader, and we have participated in the transformation of the national cold-chain infrastructure. Reliability remains our primary design criterion and customer value the basis of every innovation. Guided by “Precise Control, Enduring Reliability”, we will continue to integrate IoT and fluid-control technologies to deliver smarter, more efficient and more sustainable solutions for the global refrigeration industry. >GRAT 2-Piece Electric Ball Valve

Background In the complex operational system of wastewater treatment plants, precise and efficient fluid control is crucial to ensure water quality compliance and smooth processes. GRAT’s IoT mini electric actuator and UPVC ball valve offer exceptional performance, making them a reliable assistant in wastewater treatment. Operating Conitions Valve Body Material: UPVCMedium: Flocculant (PAC) / Sodium Acetate Solution (Carbon Source)Medium Temperature: NormalVoltage: AC 220VConnection: Internal ThreadOperation Mode: Proportional controlControl Signal: 4-20 mA with feedbackCommissioning Date: December 2023Expected Lifespan: 5 years GRAT IoT Mini Actuator This actuator is specifically designed for ball valves of DN25 and below, offering the following features: Powerful Drive and Energy Efficiency: Rated torque up to 20 NM, supports wide voltage input of AC220V/DC24V, with a rated power consumption of only 10W, combining energy savings with strong power. Precise Control and Excellent Performance: Utilizes PWM stepless speed regulation and encoder adjustment, enabling precise control within a range of 30%-100% with a control accuracy of up to 0.5%, ensuring fine-tuning of flow and pressure. Stable and Reliable Core Power: Equipped with a high-performance brushless motor, built-in overload protection, ensuring more stable operation, longer lifespan, and lower maintenance costs. Flexible Integration and Smart Communication: Supports Modbus communication protocol, allowing flexible integration into control systems for real-time remote command reception and valve status feedback. User-Friendly Interface and Emergency Handling: Features an OLED Chinese display for intuitive real-time monitoring of operational status and parameters; supports manual operation with a hex key, facilitating debugging and emergency handling. Rapid Adaptation to Complex Environments: Stroke time requires only 15s-25s, ensuring quick response and tolerance to humid environments, fully suited for the complex working conditions of wastewater treatment plants. GRAT UPVC Ball Valve In various stages of wastewater treatment, UPVC ball valves have become an ideal choice for ensuring stable and efficient operation due to their corrosion resistance, cost-effectiveness, and fluid control characteristics: Influent Stage: Rapidly responds to changes in water quality and quantity, precisely adjusts the opening degree, ensures stable influent flow, and effectively prevents corrosion of the valve body by corrosive media. Pretreatment Stage: Reasonably distributes flow to various units, adjusts flow velocity based on grid status, prevents clogging, ensures effectiveness, and significantly reduces maintenance costs. Biological Treatment Stage: Precisely controls aeration and chemical dosing flow based on IoT signals, optimizes dissolved oxygen and dosing amounts, and enhances treatment efficiency. Drainage Stage: With its sealing performance and smooth passage design, ensures stable discharge flow and pressure, integrates with monitoring equipment, and guarantees real-time compliance of drainage water quality. The GRAT IoT mini ball valve is not only a precise breakthrough in fluid control technology but also a significant response to the era of smart water management. In today’s pursuit of green, low-carbon, and sustainable development, GRAT IoT mini ball valve provides solid support for promoting water resource recycling and improving environmental governance, making it an ideal choice for the wastewater treatment sector to face future challenges.With its stable and reliable operational performance and highly automated control capabilities, GRAT deeply integrates into the entire process chain of wastewater treatment, continuously empowering plants to achieve refined and intelligent operations.

In the global push for energy transition and safety, retrofitting aging nuclear power plants is a critical priority. For these upgrades, Nuclear Electric Actuators are essential, serving as the key drivers for critical shut-off valves. Retrofitting within confined original installation spaces to achieve higher temperature resistance, faster response, and more precise control is a significant challenge, particularly in the European market. The selection of high-performance Nuclear Electric Actuators is therefore paramount. A European nuclear power plant faced such difficulties, requiring retrofit Nuclear Electric Actuators for electric shut-off valves with specifications including 1-second quick opening, 150℃ high-temperature resistance, and full compatibility with the existing control system. Multiple local suppliers had struggled to meet the combined demand for a compact size and high performance in these specialized Nuclear Electric Actuators, causing significant project delays. Leveraging deep expertise in custom actuator design, the GRAT R&D team focused on developing superior Nuclear Electric Actuators, breaking down the technical challenges into four key areas for targeted development: 1. Delivering High Torque and Speed in a Compact Design for Nuclear Electric Actuators The client required the Nuclear Electric Actuator to open the valve within one second in a tight space while maintaining a torque output of at least 15N・m. The team re-engineered the gearbox and drivetrain specifically for these compact Nuclear Electric Actuators, removing non-essential parts. The final product was 30% smaller than conventional actuators of the same class, successfully achieving full 0–90° valve opening within one second, with torque consistently above 20N・m. This breakthrough demonstrates that both compact and high-performance Nuclear Electric Actuators can indeed coexist. 2. From Class B to H: Nuclear Electric Actuators Built for Extreme Temperatures This nuclear project required the electric actuators to pass two core temperature tests: 1500 open-close cycles at 60℃, and 10 hours of continuous operation at 150℃. The initial Class B temperature-rated motor showed insulation degradation at 120℃, unsuitable for reliable Nuclear Electric Actuators in high-temp environments. In response, the team upgraded to Class H high-temperature insulation materials (180°C capability) for all motor windings and electrical components within the Nuclear Electric Actuator. The final units passed both tests without any loss of control accuracy, setting a new standard for high-temperature Nuclear Electric Actuators. 3. Custom Multi-Turn Limit System in Nuclear Electric Actuators Eliminates Travel Error Risk The client’s proposed thermal management approach risked 45–60° of positioning error, which was unacceptable for nuclear “zero-deviation” standards. For these precision Nuclear Electric Actuators, the team dedicated two weeks to developing a customized limit system. Through multiple technical meetings, the travel error was controlled within only ±1 degree, ensuring the new Nuclear Electric Actuators delivered both structural compactness and exceptional control accuracy. 4. Dedicated Worm Gear Design Ensures Long-Term Life of Nuclear Electric Actuators Nuclear equipment demands long-term reliability from every component, especially the Nuclear Electric Actuators. The team developed a custom multi-turn worm gear set for these actuators using a special wear-resistant alloy and carburizing and quenching processes, paired with a high-temperature-stable lubricant. Testing showed a 60% reduction in wear rate at 150℃ compared to standard products, ensuring the long-term precision and reliability of the Nuclear Electric Actuators for over 100,000 operation cycles. The delivered custom Nuclear Electric Actuators were seamlessly integrated into the client’s constrained space and existing control system, meeting all the stringent nuclear standards. This project not only demonstrated GRAT’s capability to deliver advanced Nuclear Electric Actuators for complex challenges but also established a replicable technical blueprint for the nuclear power renovation projects worldwide. GRAT’s customized Nuclear Electric Actuators provide a proven and reliable solution for enhancing the safety and efficiency of nuclear power equipment globally. > GRAT Explosion Proof Electric Actuator  

As nuclear facilities worldwide undergo modernization, the need for electric actuators that satisfy stricter safety norms, extreme environments, and space-limited retrofits has intensified. These components are critical for valve operation—and must deliver precision, reliability, and compliance under high temperatures and constrained layouts. A European nuclear operator approached GRAT with a complex challenge: their valve actuator retrofit required multi-turn control, 1-second opening, and 150°C resistance—all within a severely limited installation footprint. After local suppliers failed to meet these integrated demands, the client turned to GRAT based on our documented expertise in compact and high-performance actuation. Challenge: Complex Requirements in Confined Conditions During the initial video conference, the client outlined key requirements: the actuator must fit threaded shut-off valves, comply with European EN nuclear standards, open within one second, and operate continuously for 10 hours at 150°C (including five full open-close cycles). The client also expressed concerns about project feasibility, noting that several local suppliers had declined due to complexity or power compatibility issues. Approach: Structured Development and Transparent Collaboration GRAT promptly formed a dedicated customization team, breaking down the requirements into four core modules: size, speed, temperature resistance, and precision, with weekly synchronization meetings established from the start. Early in the process, the client proposed an approach where only the gearbox would be housed internally to improve heat dissipation. However, GRAT’s analysis showed this would introduce rotational error of 45–60 degrees, rendering it unsuitable for zero-deviation nuclear valve control. The team therefore proposed an alternative path. Execution: Data-Driven Testing and Iterative Optimization To meet high standards within a limited timeframe, GRAT engineers defined a clear development roadmap centered on optimized motor configuration and a customized limit system, tailored specifically to threaded valve installation. The team built a simulated high-temperature nuclear environment for validation, sharing real-time video and data with the client throughout testing. Initial test failure due to lubricant breakdown was resolved with high-temperature specialty grease; Motor windings and electronics were upgraded from Class B to Class H insulation, supplemented with custom temperature sensors—keeping the motor within safe operating limits at 150°C; Gearbox parameters were iteratively optimized to achieve both 1-second operation and 15N·m torque. The actuator underwent 1,500 cycles at 60°C and a 10-hour thermal test at 150°C (including five cycles), consistently demonstrating reliability and response under extreme conditions. All results were shared promptly with the client via detailed test reports, ensuring full transparency. The client also expressed strong interest in GRAT’s in-house developed testing equipment. Outcome: Validated Performance and Ongoing Partnership Upon sample delivery, the client conducted multiple rounds of high-temperature and rapid-operation tests—all of which were passed successfully. The actuator integrated seamlessly into the existing control system, earning praise for its compact design, responsiveness, and thermal durability. The client subsequently placed repeat orders, indicating intent for long-term collaboration. Conclusion This case demonstrates GRAT’s ability to deliver customized nuclear-grade solutions and reinforces its customer-centric approach. It also provides a reference technical pathway for retrofits of aging nuclear units worldwide. This success further indicates that customized, multi-functional electric actuators will play an increasingly vital role in the intelligent modernization of nuclear, petrochemical, and other high-temperature high-pressure industries. GRAT remains committed to supporting global clients with localized responsiveness, helping overcome challenging operational constraints with safe and efficient automation solutions. > GRAT Quick Open Motorized Actuator

Application Background In industrial combustion systems, the accuracy and stability of air volume control directly impact combustion efficiency, energy consumption, and operational safety. The customer required a highly reliable air volume regulation system for an 800mm burner damper to meet long-term continuous operation, rapid response, and low maintenance demands. GRAT provided a dedicated guide vane motor control solution, which was put into operation in May 2012 and has been functioning stably since. Operating Conditions Size: DN800Power Supply: AC220VControl Signal: On/OffFeedback Signal: 0–1 kΩ ResistanceDesign Life: 8 years (failure-free)Commissioning Date: May 2012Function: Airflow Regulation Product Advantages & Features High-Precision Control: Closed-loop feedback control technology enables real-time damper position calibration with an air volume regulation accuracy error of < ±2%. It supports 0-1kΩ analog signal feedback and is compatible with mainstream PLC/DCS control systems for seamless integration. Durability and Reliability: Core components are built with metal gears and high-temperature-resistant insulating materials, ensuring stable performance under long-term, high-intensity operation. The fully sealed structure effectively prevents the ingress of dust and moisture, making the guide vane motor suitable for harsh industrial environments. Low Maintenance Requirements: The brushless motor design eliminates carbon dust accumulation, extending the service life of the guide vane motor. The modular structure allows for quick component replacement, significantly reducing downtime and maintenance needs. Safety and Compatibility: The equipment includes overload and overheating protection functions to prevent damage. It supports universal AC220V power input and is compatible with most global industrial power standards, ensuring safe and reliable operation. Performance Results Stable Operation Record: The guide vane motor achieved failure-free operation for over 10 years since May 2012, fully meeting design life requirements. Energy Efficiency Improvement: Precise air volume control optimizes combustion air ratio, improving combustion efficiency by approximately 8%. Reduced Maintenance Costs: No major failures occurred during the period, with maintenance costs only 30% of the industry average. Customer Feedback: The guide vane motor system responds quickly and controls accurately, significantly reducing the frequency of manual intervention, making it suitable for automation upgrade projects. GRAT guide vane motors are the preferred choice for air volume control in industrial combustion systems due to their adaptability, reliability, and cost-effectiveness. We provide global customers with high-performance, long-life control products to support intelligent and efficient operations. Through continuous innovation, we help industries such as petrochemicals, steel metallurgy, and power station boilers achieve smart upgrades and energy savings, creating sustainable value. For more details, contact our technical team for full support and collaboration in building efficient, reliable control systems.

Application Background Secondary water supply systems in high-rise buildings represent critical infrastructure in modern urban construction, where their stability and reliability directly impact residents’ water safety and quality of life. In this context, performance requirements for core system components—particularly valve products—have become increasingly stringent. GRAT’s SS316L sanitary clamp-type electric ball valve, developed for the high-end secondary water supply market, is specifically designed for high-standard water supply environments. It has established an integrated intelligent pump-valve solution through mature collaboration with German WILO Wilo pump equipment. Operating Conditions Medium: Potable water; clean domestic water; occasionally exposed to low-concentration chloride disinfectants Working Pressure: 0.6-1.6 MPa Temperature: -10°C to 120°C Connection: Sanitary clamp-type Control Signal: 24V DC/220V AC; supports 4~20mA analog or pulse control Installation Locations: Pump outlet, zoned water supply pipelines, water tank inlet/outlet Operating Frequency: ≥50 open-close cycles daily Product Advantages & Features Extended Service Life Design: Utilizes precision molding technology and high-accuracy motor drive systems, ensuring over 200,000 open-close cycles with maintenance-free operation for more than 10 years. Sanitary Material Certification: Valve body constructed from SS316L ultra-low carbon stainless steel with mirror polishing, FDA compliant, fully meeting potable water hygiene standards. Intelligent Control Technology: Built-in overload protection and temperature sensing Enables start-stop synchronization and flow matching control with WILO pumps Real-time feedback of valve position status to pump control systems Proprietary Sealing Technology: Employing PTFE-enhanced composite sealing materials with zero-leakage design, significantly exceeding API 6D standard requirements. Rapid Clamp Connection: Features interface standards compatible with WILO pumps, enabling tool-free assembly/disassembly, compliant with 3A/SMS/DIN standards. Performance Results In practical applications, the water supply system comprising GRAT electric ball valves and Wilo pumps demonstrates exceptional performance: Enhanced Reliability: 85% reduction in failure rate compared to conventional valves, with 30% improvement in pump-valve collaborative efficiency Energy Consumption Optimization: Flow resistance coefficient below 0.02, achieving 12-15% energy savings compared to standard valves Water Quality Assurance: Third-party testing confirms zero contamination after prolonged use Integration Efficiency: 100% compatibility with mainstream pump equipment including WILO, reducing commissioning time by 60% Lifecycle Cost Reduction: 40% decrease in comprehensive operational costs with a payback period of less than 18 months With accelerating urbanization and increasing building heights, traditional water supply methods can no longer meet the pressure and quality requirements at the endpoints of high-rise buildings, making secondary water supply systems essential solutions. The GRAT electric ball valve series has been successfully implemented in numerous international high-end water supply projects, including super high-rise building complexes in the Middle East, pipeline systems for European star-rated hotels, and water supply systems for medical facilities in the Asia-Pacific region. These applications establish new reliability benchmarks for the global secondary water supply industry and provide technologically advanced valve solutions for water supply equipment enterprises worldwide.

In mining production, electric control valves for slurry play a critical role as key fluid control devices. The primary function of these valves is to regulate the flow and pressure of slurry, ensuring the stability and continuity of mining operations. This document outlines the working principles, characteristics, and applications of electric slurry control valves in mining production. 1. Working Principle of Electric Slurry Control Valves Electric slurry control valves consist of an electric actuator and a valve body. The electric actuator receives signals from the control system and drives the valve body to perform opening, closing, or regulating operations. When the valve opens, slurry flows through, and the flow rate and pressure are adjusted accordingly. By modulating the valve opening, precise control over slurry flow and pressure can be achieved. 2. Features of Electric Slurry Control Valves High Efficiency: These valves employ advanced electric drive technology, enabling rapid response and precise control to adapt quickly to changes in the production process. Reliability: Electric slurry control valves offer high reliability and stability, capable of operating consistently in harsh mining environments while minimizing failure rates. Intelligent Operation: Modern electric slurry control valves are typically equipped with smart sensors and control systems, enabling remote monitoring and automated control to enhance production efficiency. Safety: The design of these valves prioritizes safety, incorporating features such as explosion-proof and corrosion-resistant capabilities to ensure secure operation. Wear Resistance: The fixed-ball hemispherical structure provides excellent wear resistance. Additionally, the V port design on the valve core generates a shearing force when rotating against the hard seal, cutting fibers and preventing jamming. 3. Applications of Electric Slurry Control Valves in Mining Production Mineral Processing Control: In mineral processing, precise regulation of slurry flow and pressure is essential. Electric slurry control valves enable real-time monitoring and adjustment of flow rates, ensuring stability and efficiency in the beneficiation process. Tailings Management: Tailings treatment is a critical aspect of mining production. These valves can be used to control the flow and pressure of tailings discharge, ensuring efficient and safe management. Mine Drainage: Mine drainage is vital for maintaining mining operations. Electric slurry control valves allow precise control of flow and pressure in drainage pipelines, ensuring the proper functioning of the drainage system. Heap Leaching Operations: Heap leaching is a method for metal extraction. Controlling slurry flow and pressure during this process is crucial. Electric slurry control valves provide accurate regulation, improving metal recovery rates. 4. Conclusion In summary, electric control valves for slurry are indispensable in mining production due to their efficiency, reliability, intelligence, and safety. As technology continues to advance and mining production evolves, the application prospects for electric slurry control valves are expected to expand further. > GRAT Electric Slurry Control Valves

In the modern industrial sector, valves serve as critical equipment for fluid control, and their performance and reliability are of great significance in ensuring the stable operation of systems. The UPVC electric ball valve has garnered widespread attention due to its excellent corrosion resistance and broad application scenarios. Corrosion Resistance and Material Characteristics The UPVC electric ball valve is constructed from high-quality UPVC (unplasticized polyvinyl chloride) resin, which offers exceptional corrosion resistance and can withstand erosion from various chemical media. Whether in acidic, alkaline, or saline environments,it maintains stable performance, effectively extending its service life. Additionally, UPVC material possesses excellent mechanical properties and processability, making the valve easier to machine and install during manufacturing. Temperature Adaptability The UPVC electric ball valve is designed with full consideration of temperature factors. It can operate normally within a temperature range of -40°C to +80°C, demonstrating strong adaptability to meet fluid control requirements in various harsh environments. Furthermore, UPVC material maintains stable performance even at high temperatures, preventing valve failure due to temperature fluctuations. Connection Methods The UPVC electric ball valve employs multiple connection methods to accommodate different pipeline system requirements. Common connection methods include threaded union connections and flange connections. These connection methods are not only easy to install but also provide excellent sealing performance, effectively preventing media leakage. Additionally, the UPVC electric ball valve features quick installation and disassembly, facilitating maintenance and replacement. Application Scenarios Thanks to its corrosion resistance, temperature tolerance, and ease of installation, the UPVC electric ball valve is widely used in numerous fields. In industries such as chemical, petroleum, pharmaceutical, and food processing, it can be used to control the flow of corrosive media, high-temperature media, and high-viscosity media. Moreover, the UPVC electric ball valve plays an important role in municipal construction, water treatment, and environmental protection projects, providing reliable support for fluid transportation. Conclusion In summary, the UPVC electric ball valve, with its outstanding corrosion resistance, excellent material characteristics, broad temperature adaptability, and flexible connection methods, has become an ideal choice for fluid control in modern industrial applications. In practical use, its superior performance and reliability provide robust support for fluid control in various scenarios. With continuous technological advancements and process improvements, the UPVC electric ball valve will continue to play a vital role in the field of fluid control in the future.