A one-piece disk
with a cut around the perimeter to improve the ability
to match error or change in the angle between the seats.
Gate valves used in steam systems have
flexible wedges.
The major problem associated with
flexible gates is that water tends to collect in the body neck. Under certain
conditions, the admission
of steam
may cause the valve body neck to rupture, the bonnet to lift
off, or
the seat ring to collapse.
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