What Causes Valve Seat Leakage in Industrial Valves?

Direct Answer

Valve seat leakage occurs when the sealing interface between the valve seat and closure element fails to provide complete shutoff, allowing unintended internal flow. It is typically caused by wear, erosion, corrosion, debris intrusion, improper installation, misalignment, over-torque, or thermal distortion affecting the sealing contact surfaces under operating pressure and temperature conditions.