Inverted lubricated plug valves are high-performance valves widely used in the petroleum, chemical, and natural gas industries. Their unique inverted lubrication design effectively reduces friction and extends service life. Mastering correct operation techniques is crucial to ensuring stable valve operation.
Preparation Before Operation
Before operating an inverted lubricated plug valve, check that the valve is in proper condition, including confirming that there are no leaks from the valve body, that the lubrication system is intact, and that there is no binding between the plug and the valve seat. If the valve has not been used for an extended period, it is recommended to manually crank the valve to ensure smooth rotation. Operators should also wear protective equipment to avoid injury from high-pressure or high-temperature fluids.
Steps for Opening the Valve
1. Slowly rotate the handwheel or actuator: clockwise to close, counterclockwise to open. Apply steady force during operation to avoid sudden force that could damage the sealing surface.
2. Observe the valve opening: As the plug begins to lift off the valve seat, the fluid passageway gradually opens. You can increase the speed slightly, but maintain control to prevent water hammer.
3. Lock after Fully Opening: After the valve is fully opened, it is recommended to secure the handwheel or actuator to prevent accidental closing.
Steps for Closing the Valve
1. Gradually Close the Valve: Rotate counterclockwise to the closed position, paying attention to changes in resistance. If any unusual resistance is encountered, stop the valve and investigate the cause.
2. Ensure a Proper Seal: The inverted lubricated design allows the plug to automatically engage the valve seat when closed, creating a secure seal. After closing, gently test the handwheel to confirm that it is not loose.
3. Regular Lubrication and Maintenance: Even if the valve operates smoothly, it should be regularly lubricated through the lubrication system to maintain long-term reliable performance.
Precautions
When operating an inverted lubricated plug valve, avoid forced opening and closing under high pressure differentials or high temperatures to avoid damaging the sealing structure. If the valve is used with hazardous media, ensure that the operating environment meets safety regulations and is equipped with an emergency shut-off device.
Proper operation and maintenance not only extend the valve's service life but also ensure the safe and stable operation of the production system.
