@Chris
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Chris, not too sound like an idiot, but what are expansion links?
these are the curved quadrants that are attached at one end to the reversed direction eccentric and at the other end to the forward direction eccentric, when the position of the sliding " die block" is at the extremities of the slot the valve is open for the longest duration of the stroke and as the link is moved nearer the central position the inlet steam is cut off earlier , reducing torque but increasing expansion and efficiency follows
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