Angle seat valves, as a fundamental automation component widely used in fluid control systems, play an important role in the chemical, food, pharmaceutical, and textile industries due to their simple structure, excellent sealing, and long service life. However, neglecting relevant precautions during use can lead to valve performance degradation, leakage, and even system failure. Therefore, proper operation and maintenance of angle seat valves is crucial.
Installation Precautions
1.Directional Requirements: Angle seat valves typically have clear inlet and outlet direction markings (such as arrows). During installation, ensure that the flow direction aligns with the markings on the valve body. Failure to do so may impair sealing or cause the valve to malfunction.
2.Installation Location: It is recommended to install the angle seat valve in a location that is easily accessible for operation and maintenance. Avoid installation in locations subject to strong vibration, high temperature radiation, or external impact. If the environment is harsh, necessary protective measures (such as shock-absorbing brackets or thermal insulation) must be implemented.
3.Pipeline Cleaning: Before installation, thoroughly clean the pipes of impurities such as welding slag and rust to prevent foreign matter from entering the valve body and causing wear or blockage on the sealing surface. If necessary, install a filter at the front of the valve. 4.
Air Source and Power Supply: Pneumatic angle seat valves must be connected to a dry, clean air source (compressed air oil content ≤ 5ppm) and equipped with a pressure regulator and oil mist collector. For electric angle seat valves, ensure the supply voltage is consistent with the nameplate specifications, and the wiring is secure and reliable.
Operating Precautions
1.Opening and Closing Pressure and Temperature: Before use, confirm that the valve's operating pressure and temperature range meet the actual operating requirements. Overpressure or overtemperature operation may cause serious consequences such as seal deformation and valve body cracking.
2.Opening and Closing Speed Control: For applications with frequent pulsed opening and closing, the actuator operating frequency should be appropriately set to avoid premature damage to the valve core or sealing structure due to impact loads.
3.Manual Operation Guidelines: If manual adjustment is required (such as switching to handwheel mode), rotate the handwheel slowly to the limit position. Avoid violent actuation to avoid damage to the internal transmission mechanism.
Maintenance and Care
1.Regular Sealing Inspection: Observe system pressure changes or use a leak detector to check for leaks at the valve stem packing and flange connections. Minor leaks can be corrected by tightening the gland bolts or adding sealing grease. Severe leaks require prompt seal replacement.
2.Lubrication and Cleaning: Regularly apply specialized grease (such as silicone-based grease) to moving parts of pneumatic angle seat valves, such as the piston and guide shaft. Keep the screw and guide rails of electric angle seat valves dust-free to prevent impurities from entering and causing them to stick.
3.Seal Replacement Cycle: Depending on the corrosiveness of the media and frequency of use, check the aging of sealing rings (such as PTFE or NBR) every 6-12 months and replace them earlier if necessary.
4. Long-Term Inactivity Protection: If the valve is to be out of service for an extended period, drain any residual media from the piping and clean and dry the valve cavity. For pneumatic valves, disconnect the air supply, and for electric valves, disconnect the power cord and signal line to prevent accidental actuation.
Troubleshooting Common Troubleshooting
•Valve Unable to Open/Close: Check for insufficient air pressure (pneumatic valves), burnt solenoid coil (electric valves), or foreign matter blocking the valve core.
•Internal Leakage (Leakage Even After Closing): This is usually caused by worn valve seat sealing surfaces or spring failure. Disassemble the valve, grind the sealing surfaces, or replace the spring assembly.
•External Leakage (Leakage at Joints): Check for loose flange bolts or failed gaskets. Retightening or replacing the gaskets can resolve the issue.
The performance of angle seat valves directly impacts the reliability of the entire fluid system. Only by strictly following installation specifications, standard operating procedures, and regular maintenance can their full efficiency and durability be fully realized. Users are advised to carefully read the manufacturer's technical manual before use and consult with professional technicians for advice on special operating conditions (such as high pressure or highly corrosive media) to ensure safety and efficiency.