ter the pin valve
had seated; and if air leaks by faster than it can escape through the
relief port "c", pressure will accumulate in chamber "b" and force the
governor piston downward, so as to partially or wholly close the steam
valve 5.

28. Q. How can you tell if the pin valves leak?

A. Leakage past the pin valve in the maximum pressure head will cause a
constant blow at the relief port in all positions of the brake valve;
leakage past the pin valve in the excess pressure head will cause a blow
in the first three positions of the brake valve only.

29. Q. What would be the effect if the relief port "c" stopped up?

A. The compressor will not start promptly after the pin valve seats.

30. Q. What would be the effect if the drain port "W" were stopped up?

A. Steam leaking into the chamber under the governor piston will form a
pressure and prevent the piston being forced downward to close the steam
valve; the compressor will therefore continue to work until the main
reservoir pressure is about equal to boiler pressure.

31. Q. If the pipe leading from the feed valve pipe to the excess
pressure head of the governor breaks, what effect will it have on the
compressor?

A. The compressor will stop when the main reservoir pressure reaches
about forty-five pounds.

32. Q. If the pipe breaks, what should be done?

A. Plug the end toward the feed valve and put a blind gasket in the pipe
leading from the automatic brake valve to the governor, at the
connection marked ABV.

33. Q. If the pipe leading from the automatic brake valve to the
governor breaks, what should be done?

A. Plug the pipe toward the brake valve; the compressor will now be
controlled by the maximum pressure head.

34. Q. If the pipe leading from the main reservoir to the maximum head
of the governor breaks, what should be done?

A. Plug the main reservoir end of the pipe. The excess pressure head
will now control the compressor in the first three positions of the
automatic brake valve handle, but will have no control after the handle
is moved as far as lap position.

=PARASITE GOVERNOR=

35. Q. What is the purpose of the parasite governor, and where is this
governor located?

A. This governor is located in the pipe connection between the main
reservoir and parasite reservoir, and its purpose is to control the flow
of air from the main to the parasite reservoir.

36. Q. What is the purpose of the parasite reservoir?

A. It i