Valve seats

The watertight seal.

The valve seats are PTFE or elastomer rings that bear against the ball valve in the closed position, providing the watertight seal inside the seacock body. They are wear components that degrade over time through normal operation, chemical exposure, and compression set.

Seat condition should be assessed during any seacock service. Worn or deformed seats result in a valve that weeps in the closed position — a condition that may not be immediately apparent but represents a progressive failure of the isolation mechanism.

When replacing valve seats, verify compatibility with the seacock manufacturer's specification. Aftermarket seats of incorrect material or dimension can compromise the seal or prevent the lever handle from achieving full closure.

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