Chapter CXXII: Section 41: GOVERNING AND REGULATING SPEED, &c

(_See also p. 96._)

=2200. Atmospheric governor.= Rod ~A~ is connected to reciprocate with the engine, ~B~ is connected to the equilibrium throttle valve, ~C~ is an inlet valve for air, and ~D~ an adjustable outlet valve by which the speed is regulated. For continuous instead of intermittent action on the rod and piston ~B~, the air pump ~A~ should force air into an intermediate chamber above the piston ~B~ by addition of a diaphragm and delivery valve.

=2201. Gas engine pendulum governor.= Hit and miss. The rocking trip ~C~ falls out of gear by its own weight when the pendulum moves so fast as to release it. The upper ball is used to adjust the motion of the pendulum to the speed required.

=Crank-shaft governors.= See Section 79.

=Self-regulating dampers= are applied to boiler flues, and are
operated by the pressure of steam, so as to regulate the draught.

=Governing the speed of hoists.= See No. 1495.

=2202. Gas engine governor.= The revolving cam throws the vertical arm of the lever far enough to close the gas valve when the speed increases beyond the normal.

=2203. Steam valve-regulator,= to move a valve or other detail any fractional part of its stroke and hold it at that point. The main steam and oil cylinder valves move with the pistons. The cut-off valves are controlled by a hand lever and admit steam and oil to the same ends of their respective cylinders simultaneously; the pistons only travel till they cut off their own supply, the oil fluid preventing expansive action of the steam.

=2204. Centrifugal ball governor,= with cone wheel motion to operate the cut off.

=2204A. Even-flow regulator= or governing valve, for drawing off from a tank.