i6o MODERN STEAM PRACTICE . The valve is a disc of leather , with top and bottom plates of wrought iron , securely rivetted through and through , and it is held in Position by a central bar of iron , with long projections on the … for attaching a hook and chain when drawing the clack from the surface , as provision must be made that the clack can be drawn when the water is above the valve - chest door . Some of these valves hinge on a bar , which passes through lugs forged on the top ^ r plate and through holes in the bow ,…
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