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Knock-out holes are a feature incorporated in some valves to remove
the segmental packing rings. A loss of pressure-seal contact between
the body/bonnet/gasket can cause steam or other fluids to leak out
of a knock-out hole.
Typically, when a system sees start-up or fluctuating pressures, a
wisp of steam can be released through these holes. Flow through the
knock-out hole usually subsides quickly. Reapplying torque to the
body/bonnet bolts at operating temperature and pressure is necessary
to fully seal a pressure seal valve.
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