gh the other valve.

73. Q. If an intermediate discharge valve breaks or sticks open, how may
it be located?

A. No air will be taken in to that end of the compressor as the piston
moves from the defective valve, and may be located by holding the hand
over the strainer.

74. Q. If an intermediate discharge valve breaks, what may be done?

A. Remove the broken valve, blocking the opening made by its removal,
and as there are two upper and two lower intermediate discharge valves
the air will now pass from the low pressure cylinder to the high
pressure cylinder through the other valve.

75. Q. If a final discharge valve breaks, what effect will it have on
the compressor?

A. Will cause the compressor to stop when the main reservoir pressure is
in excess of forty pounds.

76. Q. How would you test for a defective final discharge valve?

A. To test for this defect, bleed the main reservoir pressure below
forty pounds, and if the compressor starts it indicates a defective
discharge valve.

77. Q. If a final discharge valve breaks, what may be done?

A. As the receiving valves and final discharge valves are the same size,
the defective valve may be replaced by one of the receiving valves,
blocking the opening made by the removal of the receiving valve.

78. Q. Where piston rod packing is blowing bad, what may be done to stop
it?

A. This generally indicates lack of lubrication, and by cleaning and
oiling the swab the trouble may be overcome. However, there are times
when leakage by the packing is so great that the oil is blown off the
swab as fast as it is applied, therefore is of no value in lubricating
the parts. Where this condition exists, a little hard grease wrapped up
in an old flag and tied around the piston rod will ensure its being
lubricated.

79. Q. If the compressor stops, how can you tell if the governor is
responsible for the trouble?

A. By opening the drain cock in the steam passage between the governor
and the compressor; if steam flows freely, the trouble is in the
compressor; if not, it is in the governor.

80. Q. How may a compressor often be started when it stops?

A. By closing the steam throttle for a few seconds, then opening it
quickly; if this does not start it, try tapping the main valve chamber.
This will usually overcome the trouble where the compressor stops on
account of lack of lubrication.

81. Q. What will cause a compressor to short-stroke or dance?

A. Too much oil i