Bellows Seal Valves: A Primer

When it’s critically important to keep a gas or liquid inside a system, consider a bellows seal valve. Bellows seal valves incorporate a cylindrical metal tube that expands and contracts like an accordion to create a hermetically sealed closure in a valve stem. The bellows gets compressed when the valve is in the open position and expands when the valve is closed. Because the bellows expands and contracts as the valve is operated, and because it is welded to the stem and bonnet, there is no leak path for the gas or liquid to escape.

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