Valve in the operation of the installation should pay attention to several issues

Valve in the operation of the installation should pay attention to several issues

Control valves are among the most commonly used and critical control devices in industrial production. Their proper functioning directly affects the overall performance and safety of the entire system. With the rapid advancement in control valve technology, a wide variety of manufacturers and designs now exist, each offering unique functions and specifications. This article focuses on the key issues that should be addressed before installation and operation of different types of control valves. Before installation, it is essential to conduct a thorough incoming inspection of the control valve to ensure it meets the design specifications. The inspection should focus on several critical aspects: 2.1 **Body/Trim Specifications** This includes checking the valve type, nominal diameter, seat size, plug configuration, flow characteristics, leakage class, materials (valve body, plug, seat), CV value, flange standards, and sealing surface type. Any discrepancies between the actual components and the design must be identified and resolved before proceeding. 2.2 **Actuator Part** The actuator's type, action mode, spring range, and supply pressure should be verified to ensure compatibility with the system requirements. 2.3 **Positioner** The positioner’s input signal, air pressure, electrical and gas connections, and explosion-proof rating must be checked. The explosion-proof rating should meet or exceed the design requirements. 2.4 **Accessories** All accessories such as filters, position switches, solenoid valves, hand wheels, and special tools should be inspected according to the design specifications. Tools like measuring instruments, nameplate verification, and spectroscopy for material identification can be used during this process. 3. **Hydraulic Testing** Hydraulic testing of the valve body includes both pressure testing and leakage testing. For valves with a design pressure exceeding 10MPa, pressure testing is mandatory to check the integrity of the valve body and cover. 3.1 **Pressure Test Considerations** - Use manual pressure pumps only; electric pumps are strictly prohibited. - The test medium should be clean water. - The test pressure should be 1.25 times the design pressure. - The pressure gauge must be calibrated with an accuracy of at least 1.5, and its range should be 1.5 to 2 times the test pressure. - For air-to-open valves, the plug should be opened at least 20% during the test to prevent overpressure damage. 3.2 **Leakage Test Considerations** - Manual pressure pumps should be used for all tests. - Clean water is typically used, except for Class VI leakage valves, which may use clean air. - The test pressure should match the maximum differential pressure designed for the valve. - The same calibration and gauge requirements apply as in the pressure test. 4. **Single-Valve Adjustment** After installation, the control valve should undergo single-valve adjustment to meet performance criteria such as basic error (±1.5%), return error (1.5%), and deadband (0.6%). Adjustment methods vary depending on the manufacturer and type of valve positioner, especially with the increasing trend toward intelligent systems. 5. **Installation Guidelines** Proper installation is crucial for the valve’s long-term performance. Key considerations include: - Cleaning the valve thoroughly before installation to avoid contamination. - Ensuring the valve arrow aligns with the flow direction. - Avoiding mechanical stress from pipe deformation by ensuring accurate flange alignment. - Careful welding to prevent distortion or slag damage. - Removing the valve during pipeline pressure testing to protect internal components. 6. **Linkage Testing** Before commissioning, a full linkage test must be conducted. This includes purging pipelines thoroughly, ensuring butterfly valves are not pressurized or blind-sealed, and verifying that the handwheel mechanism is in the "release" position. 7. **Conclusion** Installing and commissioning control valves is one of the most complex tasks in industrial automation. Close collaboration between instrumentation and piping teams is essential to address issues promptly and ensure compliance with standards. Only through meticulous attention to detail can the quality of installation and operation be guaranteed, leading to the successful completion of the entire project and smooth plant operation.

Ecovacs Deebot Robot Vacuum Cleaners

The most worthy of nomination for the Chinese-made robot vacuum is the Ecovacs sweeping robot. The quality control of this sweeper is very good, even comparable to many imported models. Ecovacs Robot Vacuum Cleaner adopts a special five-fold cleaning plan design, one sweep, two rolls, three suctions, four strong wipes, five aromatherapy, floating ash, hair, stubborn dust, dirt, etc. are cleaned together. At the same time, its fragrance function It can also remove odors, which is a rigid need for pet families. In addition, its internal dToF flight ranging navigation is not limited by the scene and light, so you can easily grasp the structure of the house, navigate accurately, and clean it smoothly.

Ecovacs Deebot Robot Vacuum Cleaners,Robot Vacuum,Vacuum Robot,Vacuum Cleaning Robot

Guangxi Nanning King Green Smart Co., Ltd. , https://www.smartliferobot.com