Floating Ball Valve Leakage at Low Pressure: Causes and Solutions

Floating Ball Valves are commonly used in industrial systems to control the flow of liquids and gases. These valves, which rely on the ball being pressed against the downstream seat by system pressure, provide reliable sealing under normal operating conditions. However, in low-pressure applications, Floating Ball Valves may sometimes exhibit leakage issues, which can affect operational efficiency and system safety.

Industrial Ball Valves, including floating types, are widely applied in petrochemical plants, water treatment facilities, power stations, and pharmaceutical industries. Understanding the relationship between valve type, system pressure, and leakage is essential for engineers, technicians, and maintenance personnel. At Zhejiang Xiongxiang Valve, we emphasize producing high-quality Floating Ball Valves designed for reliability even in challenging conditions.

Causes of Leakage at Low Pressure

Insufficient Differential Pressure

Floating Ball Valves rely on the differential pressure between upstream and downstream to push the ball against the seat. At low pressures, this force may not be enough to ensure a tight seal, causing minor leakage. This is particularly common in systems with low operating pressure or variable flow rates.

Worn or Damaged Seals

Over time, the sealing materials (such as PTFE or reinforced polymers) can degrade due to wear, chemical exposure, or temperature fluctuations. Damaged seals are more prone to leakage, even at standard pressures, and are especially vulnerable at low-pressure conditions.

Valve Stem or Packing Issues

Leaks can occur externally from the valve stem packing if it is not properly maintained or installed. Low-pressure systems often mask minor leaks until they become noticeable, making inspection critical.

Improper Installation

Incorrect alignment or orientation of the valve can cause uneven pressure on the ball and seat, resulting in leakage. Even small deviations from manufacturer-recommended installation practices can reduce the valve's sealing performance.

Solutions and Preventive Measures

1. Consider Alternative Valve Designs

For low-pressure systems prone to leakage, trunnion-mounted ball valves may offer better performance. Unlike floating ball valves, trunnion-mounted designs have a fixed ball supported by bearings, which reduces stress on the seat and maintains a better seal even at low pressures.

2. Regular Maintenance and Inspection

Implementing a scheduled maintenance program is key. Technicians should regularly inspect seals, packing, and the valve body for signs of wear, corrosion, or damage. Early identification of potential issues can prevent costly downtime.

3. Proper Installation Practices

Ensure the valve is installed according to manufacturer specifications. This includes correct orientation, torque settings for flange bolts, and alignment with piping to prevent undue stress on the valve body and ball.

4. Seal Replacement and Lubrication

Using high-quality replacement seals and applying appropriate lubrication can significantly improve sealing performance. Xiongxiang Valve offers compatible sealing materials designed to handle various industrial fluids, temperature ranges, and pressures.

5. System Pressure Management

In some cases, adjusting upstream pressure or installing a pressure booster may help maintain sufficient force on the ball, minimizing leakage in floating ball valves.

Leakage in Floating Ball Valves at low pressure is a manageable issue when understood and addressed properly. By combining proper valve selection, regular maintenance, correct installation, and attention to system conditions, industries can significantly reduce leakage risks. Zhejiang Xiongxiang Valve continues to develop high-performance floating and industrial ball valves, helping clients maintain safe, efficient, and reliable fluid control systems.