Wuhan Grat Control Valve Co., Ltd.

Pneumatic Valve Working Mechanism: Key Components, Air Pressure Role & Fail-Safe Designs for Industrial Use- Core Rules

Pneumatic Valve Working Mechanism: Key Components, Air Pressure Role & Fail-Safe Designs for Industrial Use- Core Rules 1 Core PrinciplePneumatic valves control fluid flow (air, gas, or liquids) using compressed air to actuate internal pistons or diaphragms. Unlike electric valves, they're explosion-proof, making them ideal for hazardous environments like chemical plants or oil refineries. Key Advantage: No electrical sparks ,safer for volatile settings.   2 Key Components Actuator: Converts air pressure into linear/rotary motion. Valve Body: Contains ports and seals to direct flow. Solenoid (for automated valves): Electrically controls air supply to the actuator. Why It’s Reliable: Fewer moving parts ,lower failure rates vs. hydraulic systems.   3 Compressed Air's Role Air pressure (typically 20–120 psi) acts on the actuator’s piston/diaphragm. When pressure overcomes spring resistance, the valve shifts. Releasing pressure lets the spring return it to default. Critical Factor: Air must be clean/dry to prevent corrosion or clogging. 4 Fail-Safe Mechanisms Many pneumatic valves are "spring-return" – they auto-close if air supply fails (crucial for safety in power plants or chemical systems). Alternative: Double-acting actuators (air moves valve both ways) for higher speed/force.   5 Speed & PrecisionResponse time is rapid (milliseconds), but flow control isn’t as precise as electric valves. For accuracy, proportional pneumatic valves modulate air pressure to adjust flow gradually. Trade-off: Simplicity over precision; best for ON/OFF or coarse control.   6 Real-World Application Example: In bottling plants, pneumatic valves control air bursts to clean bottles. Their durability and fast cycling outperform electric alternatives. Takeaway: Pneumatic valves excel where speed, safety, and simplicity matter.  > GRAT Pneumatic Ball Valve

Exhibition Recap: A Successful Showcase of Our Latest Innovations in CIPPE

At the recent CIPPE exhibition  in Beijing, GRAT had the opportunity to present our latest advancements in valve technologies, including the Explosion-proof Electric Actuator and the Electric Plug Valve. The event was a major success, with our products receiving strong interest from key industry players in sectors like oil & gas, chemical processing, and power generation. The highlight of our presentation was the Explosion-proof Electric Actuator featuring the CT6 protection grade and CCC certification, designed for use in hazardous environments. This actuator proved particularly appealing to clients in the oil and gas industry, where safety is paramount. Additionally, we demonstrated our Electric plug valves used in high-pressure applications, which offer compact design, easy maintenance, and rapid operation for critical operations like fracturing and cementing. Our Electric plug valve, an essential component in cementing and fracturing operations, drew attention for its high sealing reliability and compact structure, ensuring smooth and efficient operations in challenging field conditions. As the demand for more automation and safety in critical operations continues to grow, GRAT remains at the forefront, delivering cutting-edge solutions that enhance operational safety and efficiency.

Clean Drive, Clear Choice: GRAT Ball Valves Optimize Automotive Filter Testing Systems

Automotive filter elements are one of the essential foundational components of vehicles; their stability and reliability are vital for ensuring vehicle performance. At the core of this are intelligent electric actuators.     The GRAT range of pneumatic and electric ball valves has been committed to providing products and technical support to leading enterprises in the filter tester equipment industry. These valves are designed for simplicity and reliability, requiring no after-sales service or maintenance from the initial deployment through to long-term operation, earning consistent high praise from customers. The images below illustrate the application and integration of our valves: GRAT is committed to the progress of automotive filter testing technology, delivering a track record of high-quality and reliable solutions that meet industry standards. For more information on how GRAT's pneumatic and electric ball valves can enhance your automotive filter testing systems, please do not hesitate to contact us. > GRAT Electric Intelligent electric actuator

Refrigeration Advances: Unveiling GRAT's High-Performance Refrigeration Solutions

With the national strategy for "carbon peak and carbon neutrality" taking effect, the era of "carbon neutrality" has officially begun. The refrigeration industry has become a key focus for advancing the dual goals of carbon reduction. Increasing research into energy-saving technologies, enhancing energy efficiency, and achieving green development offer significant opportunities for growth within the refrigeration industry. GRAT provides technical support and solutions to the refrigeration industry, with products known for precise regulation, zero leakage, and low fault rates. Our control and regulating valves have demonstrated long-term stability in refrigeration units, earning unanimous praise from customers. GRAT continues to innovate, offering higher quality products and services to the refrigeration industry. Industry Case: Application: Industrial Refrigeration Medium: Freon Control Mode: Two-way Shut-off Valve Body Material: SCPH2 Valve Core Material: SUS304 Nominal Bore: DN80, DN100 Medium Temperature: -30℃ to +60℃ Working Pressure: PN1.6Mpa Design Life: 5 to 8 years Control Signal: AC220V Switching Quantity Application Conditions: Air-liquid mixture of Freon containing refrigeration oil For more information on how GRAT's innovative solutions are advancing the refrigeration industry towards carbon neutrality, please explore our website and follow our latest updates. > GRAT Electric Intelligent electric actuator

Enhancing Sustainable Development: GRAT's Electric Three-Way Ball Valves in Philippine Water Treatment

Sustainable development is a concept that seeks to meet the needs of the present without compromising the ability of future generations to meet their own needs. It calls for a balance where humanity must, while extracting from and creating a prosperous life in nature, not sacrifice its own living environment. With the rapid development of industrialization, industrial waste has become a significant obstacle to sustainable development. Our client in the Philippines, a specialized water treatment company, is dedicated to understanding industry needs and valve directions. They are committed to providing professional services and assistance, optimizing the manufacturing and operational processes of their products.   As a technology-based company, relying on an in-depth industry background and long-term practical experience, they provide a rapid response to customer needs, offering efficient solutions for environmental issues such as wastewater, exhaust gases, and chemical waste. Based on the actual working conditions at the customer's site and leveraging our rich experience in the environmental protection and water treatment industry, we have provided the following product information: Electric Three-Way Ball Valve Specifications: Voltage: AC220V Bore Size: DN50 Temperature: ≤120°C Pressure: ≤16 bar (Replace with the correct unit if the original text specifies a different unit) Valve Body Material: SS304 Connection Type: Threaded Protection Level: IP67 Three-Way Ball Valve Type: L-Type   > GRAT Electric Three-Way Ball Valve

How to Address Valve Erosion and Corrosion

Erosion and corrosion are phenomena where the internal metal surface of a valve pipeline is damaged due to high-speed relative motion between the metal and fluid. This interaction results from the combined effects of erosion and corrosion, leading to significant local corrosion. This issue is prevalent in the elbows of valves and pipelines in the oil, chemical, energy, and power industries, especially in high-pressure, high-temperature fluid transportation pipelines with solid particle flow, liquid-solid mixed flow, and liquid-gas-solid three-phase flow. Consequently, erosion and corrosion problems have garnered significant attention.   When valves in pipelines are affected by erosion and cavitation, it can cause local thinning of the pipe wall and internal corrosion of the flow channel. Excessive pressure may lead to leaks or ruptures. Typically, corrosion areas can be detected by ultrasound, but edges or overheated pipelines cannot be detected using this method. Therefore, erosion and cavitation remain particularly challenging issues in industrial production. I. Analysis of Erosion Causes Flash evaporation of fluid medium causes erosion to the valve. Hard impurities in the fluid medium cause severe erosion and wear to the valve components. Valve opening between 30%-40%, resulting in a small flow area and accelerated fluid velocity, leading to high-pressure erosion of the valve components. The fluid medium's flow trajectory at 30% valve opening (see Figure 1) shows direct impact on the valve body outlet inner wall and flange edge, causing erosion. Conventional imported valves are also unsuitable for erosion conditions (see Figure 2). Figure 1: Original valve medium flow trajectory Figure 2: Damage to imported brand valves Figure 3: Damage to domestic brand valves in metallurgy and chemical industries Slurry (contains 5% seawater)   II. Solutions   To address the erosion problem of the on-site valve body, our company uses a sealing seat with an open baffle design and special wear-resistant metal materials plus aerospace wear-resistant treatment (see Figure 3). This structure slightly reduces the diameter of the valve seat, increasing valve opening and allowing hard media such as slurry to flow through the valve chamber, significantly reducing erosion and wear on the valve body walls. The baffle structure of the sealing seat provides a first layer of protection, ensuring that even if the baffle is worn, the sealing effect of the valve is not compromised. The valve core and the sealing surface of the valve seat, along with the inner wall, are treated with wear-resistant coatings (e.g., hard chrome plating, WC spraying, or aerospace hard alloy overlay welding), extending the service life of valve components and overall valve durability.   Figure 3: Sealing Seat with V-shaped Open Baffle                     Figure 4: Conventional Valve Sealing Seat         III. Ordering Instructions This solution is suitable for erosion conditions, with a specially designed baffle structure on the valve seat to effectively prevent fluid medium erosion. To improve effectiveness, it is recommended to provide specific technical parameters from the site (e.g., medium, medium pH value, valve opening, flow rate, pressure difference, closing pressure, medium temperature) to select the most appropriate sealing materials and special component treatments. Valve materials available include 304, 304L, 316, 2205, SMO, etc., for reference.   Figure 5: GRAT Control Valve Erosion-resistant Wafer Ball Valve (available with flanged connection)