What is a likely cause for leakage across the pressure seal ring of a valve?

• A. Faulty valve design
• B. Insufficient preload on the yoke to bonnet connection
• C. Excessive pressure from the fluid
• D. Corroded valve components

Answer: (B)

When considering leakage across the pressure seal ring of a valve, insufficient preload on the yoke to bonnet connection is indeed a likely cause. The preload is essential for maintaining the integrity of the seal between the bonnet and the body of the valve. If the preload is insufficient, it may not provide the necessary clamping force to hold the pressure seal ring tightly against the mating surface. This can allow for gaps where fluid can escape, leading to leakage.

Properly weighted preload ensures that the pressure seal is compressed adequately, thus preventing any form of leakage. This mechanical principle highlights why this choice addresses the issue directly related to the functionality of the valve and its sealing capability. In scenarios where the preload is not adjusted correctly, the risk of leakage increases significantly because the seal may not be able to withstand the pressure exerted by the fluid within the system.

The other options, while they may present valid concerns in different contexts, do not specifically address the mechanism of leakage related to the pressure seal ring as effectively as insufficient preload does. For instance, a faulty valve design could lead to various malfunctions, but it doesn’t directly imply a failure in maintaining the appropriate seal under pressure. Excessive fluid pressure could also contribute to leakage, but unless it exceeds the designed