Wuhan Grat Control Valve Co., Ltd.

In industrial fluid control, precise flow distribution and reliable shut-off performance are critical to system stability. Designed specifically for lithium bromide unit condensate systems, the electric three-way shut-off valve delivers efficient dynamic fluid control through bidirectional flow management, fast-acting operation, and advanced control integration.     In lithium bromide refrigeration systems, condensate flow distribution critically impacts heat transfer efficiency and operational stability. The electric three-way valve serves as the central flow-regulation component via: ✅ Adaptive flow distribution: Automatically redirects flow in real-time based on unit load changes to balance branch condensate flows, preventing localized overloading.✅ Emergency safety shut-off: Instantly isolates flow when abnormal pressure or equipment failure is detected, preventing backflow-induced pressure surges.✅ Zero-leakage reliability: PTFE stem packing and elastomeric seat seals maintain integrity during continuous flow-redirection cycles, minimizing maintenance downtime.   Rapid Response & Low Noise · Stroke time < 15 sec: Intelligent actuator enables emergency shut-off to prevent equipment damage · Sound pressure level ≤ 85 dBA at 1 m: Optimized flow path geometry minimizes turbulence for noise-sensitive applications Smart Integration & Robust Construction · 4–20mA + HART protocol: Direct DCS/PLC integration enables remote monitoring and automated control · Durable 316 stainless steel trim with PTFE seat seals: Maintains integrity during flow redirection · Carbon steel body: Provides structural strength for standard operating condition Epilogue Centered on its flow-diversion capability, the electric three-way shut-off valve integrates rapid response and intelligent control to deliver precision fluid-distribution solutions for lithium bromide unit condensate systems. We remain committed to advancing industrial valve technologies that enhance process reliability through engineering excellence. > Wuhan Grat Control Valve CO.,LTD

1.What is a pneumatic valve?A pneumatic valve is a device that uses compressed air to actuate (open, close, or proportionally control flow through) a valve. Key components include the valve body, valve stem, trim (e.g., ball, disc, plug), seals, and a pneumatic actuator. Compressed air acts on a piston or diaphragm within the actuator, generating linear or rotary motion to position the closure element. Due to their advantages of rapid actuation, ease of automation, and reliable performance, pneumatic valves are widely used in critical industries such as chemical processing, oil & gas, power generation, and natural gas, where they play a vital role in complex process control. 2. Working Principle AnalysisPneumatic valve operation begins at the air preparation unit (typically filters, regulators, and compressors), which intakes ambient air, removes impurities/moisture, and pressurizes it into compressed air. This air is distributed via piping to pneumatic actuators (diaphragm types for linear motion, piston types for high-force/stroke applications).For example: When air enters a diaphragm actuator's chamber, the diaphragm elastically deforms under pressure, displacing the valve stem. The stem mechanically transfers this motion to position the trim (e.g., plug, ball, or disc), thereby opening, closing, or modulating flow through the valve body. Normally Open (NO) Pneumatic Valves: Default state: Spring force holds the closure element (e.g., plug) open, ensuring uninterrupted fluid flow. Upon actuation: When a control signal (e.g., solenoid valve energizing) applies air pressure to the actuator, the piston/diaphragm overcomes spring force, driving the stem to move the closure element to the closed position and shut off flow. Normally Closed (NC) Pneumatic Valves: Default state: Spring force maintains the closure element in the closed position, blocking flow. Upon actuation: Air pressure applied to the actuator compresses the spring, retracting the stem to open the closure element and permit flow. The operating principle of piston pneumatic actuators similarly relies on differential air pressure across the piston. When pressurized air is applied to one side of the piston chamber, it generates linear force to drive the piston rod. This motion is mechanically transmitted through the valve stem to position the closure element (e.g., plug, ball, or disc). Piston actuators deliver higher thrust outputs than diaphragm types, making them ideal for large-bore valves and high-pressure applications where greater actuation force is required. 3.the implementation of the adjustment function Certain pneumatic valves incorporate flow regulation capabilities beyond basic on/off control. This is achieved through specialized closure element designs like V-port balls or eccentric rotary plugs. V-port Ball Operation:Rotation of the ball alters the V-shaped orifice area between the ball and seat. As the ball rotates from 0° to 90°: Opening phase: Flow area rotation angle → Flow rate increases Closing phase: Flow area (90° - rotation angle) → Flow rate decreases Control Mechanism:Precise regulation requires: Positioning system: A valve positioner converts control signals (4-20mA/pneumatic) into precise air pressure modulation. Actuator response: Modulated air pressure drives the actuator to achieve target rotation angle. Flow characterization: The V-port's engineered profile provides linear/equal-percentage flow characteristics. A thorough comprehension of pneumatic valves operational principles and performance characteristics – including rapid actuation, precise flow control, and fail-safe functionality – enables engineers to: Optimize process parameters (e.g., response time, pressure setpoints). Enhance production efficiency through reduced cycle times. Lower operational costs via minimized energy consumption and maintenance downtime. Ensure production chain stability with reliable shutoff and leakage control meeting product standards. > Wuhan Grat Control Valve CO.,LTD

Electric actuator slowing down? Daily near+100 cycles & two root causes + fixes.In industrial automation systems requiring 100+ daily cycles, electric actuator slowdown can cripple productivity. A real-world example: An actuator’s cycle time degraded from 15-30s to 45+s within 8 months, costing 20+ minutes of downtime daily. While the OEM denied warranty coverage, our engineering team diagnosed and fixed the issue—here’s how. In a reverse osmosis (RO) water treatment system, a DN150 butterfly valve with a 100 Nm electric actuator showed significant performance degradation under high-frequency cycling (80-90 actuations/day)—despite otherwise mild operating conditions. Medium: Purified water (non-abrasive) Pressure: Constant 1.18MPa Valve configuration: DN150 butterfly valve with 100 Nm torque motorized head. Technical team diagnosis: two core reasons. By analyzing the valve body structure, operating condition data and equipment configuration, we found the following problems:     1.Severe Seat Wear Causing Increased Actuator Torque Demand The cycle life of national standard (GB) butterfly valves is typically 20,000 to 30,000 cycles, while European standard (e.g., EN) valves achieve 40,000 to 60,000 cycles. The customer operates this valve 80 times per day, totaling nearly 20,000 cycles within 8 months. This usage approaches the end of the valve seat's expected service life.   Consequences of friction: Increased friction between the seat and disc results in a sustained rise in actuator torque requirement and longer stroke times.   2.The actuator was significantly under-torqued for the application — a classic case of a small horse pulling a heavy cart The DN150 butterfly valve is usually equipped with a motorized head with 200 Nm torque, but the customer only configured it with 100 Nm.   Direct impact: Long-term overload of low-torque actuators accelerates component aging and further slows down switching speeds.  Optimal Solutions for Valve Maintenance & Performance Enhancement Option 1: Replace the Worn Valve Seat If the valve seat is found to be severely worn, directly replace the valve seat with a high wear-resistant material to restore the performance of the valve body and prolong the service life.  Option 2: Upgrade to a Higher-Torque Electric ActuatorIf the valve seat is intact, upgrade to a 200 Nm electric actuator to ensure proper torque matching and prevent overloading. Essential Maintenance Guidelines for High-Frequency Valve Operation 1.Inspect valve seat wear regularly. For valves with over 50 daily cycles, quarterly inspections are recommended. 2.Ensure proper actuator torque matching to prevent premature wear caused by undersized torque of actuators. 3.Select durable valve bodies, such as EN-standard butterfly valves, to significantly extend maintenance intervals. Grat's Service CommitmentAs a professional control valve service provider, we are committed to delivering solutions until the problem is fully resolved. Regardless of warranty status, we offer complimentary technical diagnostics and tailored solutions to ensure efficient and stable production operations. > Wuhan Grat Control Valve CO.,LTD

1.Working PrincipleThe explosion-proof electric plug valve consists of a plug, valve body, sealing components, and an electric actuator. Upon receiving a control signal, the actuator rotates the plug to precisely regulate flow—enabling open, close, and controlling functions. Its explosion-proof capability is achieved through robust design and manufacturing processes, effectively isolating ignition sources (e.g., sparks or high temperatures) in flammable oil and gas environments. 2. Key Features of Explosion-Proof Electric Plug Valves   Quick-Acting OperationRequiring only a 90° rotation to achieve full open/close positions, these valves enable rapid response - a critical advantage in time-sensitive oilfield operations where process efficiency is paramount. Low Flow ResistanceThe straight-through flow path design minimizes flow turbulence, resulting in:• Reduced pressure drop across the valve• Lower system energy consumption• Improved overall pipeline efficiency Superior Sealing PerformanceFeaturing advanced sealing materials and optimized geometry, our valves ensure:• Zero-leakage performance• Reliable operation across varying pressure/temperature conditions• Extended service life High-Pressure CapabilityEngineered to withstand extreme wellhead pressures ,the robust construction guarantees operational safety in demanding downhole environments. 3. Critical Applications in Oil & Gas Operations Crude Oil Transmission & Wellhead Control• Provides immediate shut-off and precise flow regulation in high-pressure flow lines• Prevents hydrocarbon leaks and wellhead blowouts through fail-safe design• Self-cleaning seal mechanism minimizes particulate fouling in sandy/high-viscosity crude applications Gas Processing & Gathering Systems• Ensures reliable flow diversion during gas separation/compression cycles• Maintains pipeline pressure stability preventing leakage • Explosion-proof construction for methane-rich environments Waterflood & Fracturing Operations• Regulates high-pressure injection fluids • Enhances EOR efficiency through accurate flow control • PTFE-lined stainless steel construction resists HCl/HF acids in stimulation fluids Emergency Shutdown (ESD) SystemsLinked with the automatic control system, the pipeline can be quickly cut off in case of distress to prevent the spread of the accident. 4.Industry Outlook & Technological Evolution As offshore and remote oilfield developments progress, operational demands for equipment safety and reliability are reaching unprecedented levels. Explosion-proof electric plug valves are evolving through three key technological vectors: smart Integration, enhanced performance, sustainable solutions   For detailed technical specifications or application engineering support, our technical specialists are available for consultation. Contact us to discuss your project's specific requirements. > Wuhan Grat Control Valve CO.,LTD

In October 2020, GRAT supplied its hard-sealed electric control butterfly valve for a flue gas desulfurization (FGD) system at a Steel Group in Jinan, China.The process involves gas-liquid reactions, requiring corrosion-resistant and precise control valves to ensure stable operation. Flue gas desulfurization is key to controlling SO₂ emissions in industries like steel, with wet FGD being the most common method. The valve is used for coke oven gas concentration regulation, handling SO₂, SO₃, CO₂, and other process gases in a demanding industrial environment, and achieves over 90% desulfurization efficiency. Here are the key specifications of the GRAT valve used in this application: Medium: Process gas containing SO₂, SO₃, O₂, N₂, CO₂, H₃O Pressure: PN16 Size: DN350-DN800 Material: SUS304 stainless steel (disc & seat), WCB (body) Connection: Wafer-style Actuation: 4-20mA proportional control, smart electric actuator with local/remote switching & LCD display Power Supply: AC380V With its smart electric actuator, the GRAT valve enables precise and automated gas flow regulation, ensuring stable SO₂ removal while simplifying system operation and monitoring. As industries continue to seek efficient and reliable solutions for emission control, GRAT remains committed to providing durable, high-performance valves that support long-term operational stability in demanding environments. - GRAT Electric Control Butterfly Valve -

Automotive parts production often requires high-temperature and high-pressure steam generated from industrial boilers. These boilers rely on boiler gas, a flammable medium that demands strict control to ensure operational safety and efficiency. Any leakage or malfunction in the gas supply system could lead to production disruptions or severe safety hazards.In 2023, GRAT supplied a DN400 pneumatic on-off ball valve with a hydraulic manual override for a boiler gas supply system in a major automotive parts production facility. Below are the key technical specifications that make it fit for this challenging application. Application Site: Boiler gas supply system Industry: Automotive parts manufacturing Function: Medium switching and shut-off Product Name: DN400 Pneumatic On-Off Ball Valve with Hydraulic Manual Override Material: WCB (Carbon Steel) Connection Type: Flanged Connection Nominal Pressure: 1.6MPa Medium: Boiler Gas Power Source: Compressed Air Design Life: 5-10 years Designed for seamless medium switching and shutdown, this valve ensures stable and safe operation under demanding industrial conditions. GRAT’s pneumatic on-off ball valve has proven to be a reliable and high-performance solution for the automotive manufacturing sector’s fuel supply needs. By integrating advanced pneumatic control with durable construction, GRAT continues to support industrial applications with safe, efficient, and long-lasting valve solutions. > GRAT  Pneumatic On-Off Ball Valve 

Valves are essential components in industrial systems, ensuring safe and efficient operations. In this case study, we examine the application of GRAT's electric butterfly valve in a hydropower station, showcasing its reliability and performance in a water control system.       Application Case: GRAT Electric Butterfly Valve in Hydropower Stations   Application: Hydropower Station Dam Flow Release Medium: Water (Ambient Temperature) Nominal Pressure: PN16 Sizes: DN100 / DN150 Material: SUS304 Stainless Steel Connection Type: Wafer Style Operation Mode: On-Off Power Supply: DC24V / DC220V Operational Date: August 2018 Location: Fujian, China   This electric butterfly valve is used to control the water discharge at a hydropower station dam, playing a crucial role in environmental management. Constructed with SUS304 stainless steel, it ensures long-term durability and resistance to corrosion in a water-based environment. Key Benefits: Durable & Reliable: Made from SUS304 stainless steel, ensuring long-lasting performance. Precise Control: On-off operation enables accurate flow regulation. Energy-Efficient: Low power requirements (DC24V / DC220V) for cost-effective operation. Long Service Life: Designed to last for 5 years with minimal maintenance.   GRAT’s electric butterfly valve provides a reliable solution for water flow control in hydropower applications. Its durability, energy efficiency, and ease of installation make it ideal for demanding environments like dams and hydropower stations.     > GRAT Wafer Electric Butterfly Valve

The Electric Plug Valve is engineered for use in high-pressure applications like cementing and fracturing in the oil and gas industry. Known for its compact design and easy maintenance, it operates with a small torque and offers rapid opening, making it the ideal valve for critical operations in harsh environments. Key Specifications: Rated Pressure: 2,000~15,000psi Nominal Diameter: 2” & 3” Working Temperature: LU Pressure Class: PSL1~4 Performance Class: PR 1~2 Material Grades: AA, BB, CC, DD, EE, FF Operating Medium: Petroleum, Natural Gas With its high precision and reliable sealing between the plug and seat, the motorized plug valve provides secure control even in demanding conditions. It is ideal for remote control and automated operations, eliminating the need for personnel to operate manually in hazardous areas. Explosion-proof Electric Actuator: Designed to meet Ex db IIC T6 Gb standards, this actuator ensures safe operation in explosive atmospheres like methane or hydrogen sulfide. With an output torque range of 50~4000N·m, it covers valves up to DN300 and operates in IP67 environments, making it perfectly suited for underground operations. The actuator is a game-changer for operations requiring high safety standards, offering remote control and real-time data integration for process monitoring, fault alerts, and operational optimization. Key Benefits: Enhanced Safety: Reduces risks by enabling remote control, minimizing human exposure to hazardous environments. Increased Efficiency: Fast opening and closing, enhancing workflow during high-frequency operations. Smart Integration: Supports data collection, fault monitoring, and system optimization via digital platforms. The electric motorized plug valve, paired with our explosion-proof actuator, exemplifies the integration of automation, safety, and performance—key elements for enhanced operation control in oilfield and high-pressure gas environments. For further inquiries or pricing details, please feel free to contact us or visit our inquiry page. We look forward to collaborating with you.