[2471]. Cam-bar movement for operating two valves used for hydraulic starting valves.
[2472]. Crank shaft governor cut-off gear. Two hinged centrifugal weights are coupled by links to the cut-off eccentric sheave, and returned to the full open position by springs.
[2473]. Joy’s locomotive valve gear operated by the connecting rod; the rod A is connected to the starting lever to reverse, vary, or stop the distribution of steam by the slide valve, as in the ordinary link motion.
[2474]. Lever and T crosshead to open a valve by either motion of the lever to right or left. See also [No. 2463].
[2475]. Crank shaft governor (Prof. Sweet’s), cut-off gear to vary the throw of a cut-off eccentric.
[2476]. Reversing link motion, with single eccentric; the slot link is hinged to the reversing lever.
[2477]. Sleeve and eccentric motion for governor cut-off. The inner (longest) sleeve has a longitudinal movement from the governor along a straight feather groove in the shaft, and has a spiral groove in its periphery into which projects a pin or feather on the eccentric sleeve, so that the longitudinal motion of the inner sleeve revolves the eccentric and alters the travel of the cut-off slide.
[2478]. The Walschaerts valve gear, one eccentric. The slotted link is hung at its centre to a fixed hinge pin, and the reversing gear shifts the link block up or down the slot link.
Slide valves may be worked by rack and pinion on the back or side flanges of the valve, or by a screw and nut; the nut being let into the body of the valve in a recess.