A Lever Operated Ball Valve is a quarter-turn valve that uses a mechanical lever to control the opening and closing of the valve. While this type of valve is known for reliability, various issues can still arise due to wear, environmental conditions, or improper installation. Identifying and resolving faults early helps prevent system failure and minimizes downtime.
Common Issues:
Stiff or Hard-to-Turn Lever: This is often the result of internal buildup, corrosion, or lack of lubrication. A stiff lever may indicate that the ball or stem is obstructed, possibly by sediment or scale accumulation inside the valve.
Leakage Around the Stem: Stem leakage typically suggests wear or damage to the stem packing or O-rings. Replacing these components usually resolves the problem.
Valve Fails to Seal Completely: Incomplete closure can occur if debris is lodged between the ball and seat, or if the sealing surfaces are worn or damaged. Inspection and cleaning, followed by seat replacement if necessary, are recommended.
Handle Misalignment or Slippage: This may be due to a loose or damaged connection between the handle and the stem. Tightening or replacing the handle can restore normal function.
Diagnostic Process:
Visual Inspection: Check for signs of corrosion, deformation, or external damage to the valve body and handle.
Operational Test: Rotate the lever through its full range to evaluate resistance or irregularities.
Leak Testing: Apply pressure to the system and monitor for fluid leakage at joints, seals, and the stem.
Disassembly: If external checks are inconclusive, carefully disassemble the valve for a more detailed inspection of internal components.
The Floating Ball Valve features a design where the ball is not fixed to the stem and can "float" slightly downstream under pressure, pressing against the downstream seat to ensure tight sealing. To maintain performance, especially in applications involving abrasive or viscous fluids, routine cleaning and lubrication are essential.
Cleaning Process:
System Depressurization: Before cleaning, ensure the system is completely depressurized and drained. This prevents injury and avoids contamination during disassembly.
Valve Disassembly: Remove the valve from the pipeline if necessary. Disassemble the valve components, including the ball, seats, and seals.
Internal Cleaning: Use appropriate solvents or mild detergents to clean the internal surfaces. Avoid using harsh chemicals that may degrade sealing materials such as PTFE or elastomers. For metal components, soft brushes or non-abrasive cloths are recommended to remove buildup without scratching.
Inspection During Cleaning: Examine parts for signs of wear, corrosion, or deformation. Replace any worn components before reassembly.
Lubrication Guidelines:
Lubricant Selection: Choose a lubricant compatible with both the process fluid and valve materials. For example, food-grade grease is required in sanitary applications, while hydrocarbon-resistant grease is suitable for petrochemical use.
Lubrication Points: Apply lubricant to the stem, seat rings, and ball surfaces where metal-to-metal or metal-to-polymer contact occurs. Proper lubrication reduces friction and prevents premature wear.
Reassembly and Testing: After lubrication, reassemble the valve carefully, ensuring all components are properly aligned. Conduct a pressure test to confirm sealing integrity and operational smoothness.
Regular cleaning and lubrication not only extend the service life of a Floating Ball Valve but also enhance operational safety and efficiency. In high-frequency or high-load systems, a routine maintenance schedule should be established, including periodic inspection and servicing.
English 
русский 
Español 
عربى 
