How to determine whether it is a hole in the valve cage or a hole in the valve core for a cage-type control valve
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Is drilling the valve core meant for secondary pressure reduction? Is it necessary to drill the valve core even when the steam pressure difference is very small?
It is the valve cage that is perforated, not the valve core; the openings in the valve core are responsible for the inherent flow characteristics.
Whether to drill the valve spool or the valve cage varies depending on each manufacturer’s design philosophy. It is also related to the operating conditions of the valve; for example, in situations with a large pressure difference and low flow rate, perforations in the valve core offer advantages, while in cases of high flow rates, perforations in the valve cage provide a better design for flow control.