A. Would first ascertain if sufficient water was in the tender and tender valve open, and that water was cool enough in the tender so the injector would handle it.  Would next see that no obstruction was in the feed pipe or strainer and that the feed pipe was free from leaks, and that the injector was getting a sufficient supply of steam.  If the injector would not prime, would see whether overflow or heater valve could open wide, or if overflow pipe was obstructed.  If suction pipe was very hot would blow water back into tank and let suction fill with cold water.  If possible, examine for obstruction in the steam priming tube and water tubes.  If it would prime and fail to deliver water to the boiler, would see that the delivery tube was not obstructed and then look for trouble at the boiler check.  An obstruction in the tubes would stop the injector working at once, while wear of the tubes or filling up with scale would affect the injector gradually.

110.  Q. What are the advantages of the combination boiler check and stop valve?

A. A combination boiler check is fitted with a valve similar to a globe valve and can be closed at will.  Its advantage is that the boiler pressure can be shut off from the check and the valve repaired without cooling the boiler.  This hand-operated valve can be closed to prevent the boiler water passing back in case the check valve sticks up and allows the boiler water to pass back to the injector when not working.

111.  Q. How can a disconnected tank valve be opened without stopping?

A. Close the overflow or heater valve and turn steam back toward the tank; this will usually lift the valve from its seat or turn it around so it opens.

112.  Q. What comprises the steam heat equipment on a locomotive?

A. A globe valve throttle at the boiler, a reducing valve, a steam gauge connected to the steam heat pipe and the proper piping and hose connections.

113.  Q. What pressure is carried in the steam heat pipe, and how is it controlled?

A. From twenty to sixty pounds in the train pipe, depending on the length of the train, and is controlled by the regulating valve.

114.  Q. What would you do in case the regulating valve failed to operate?

A. In case the regulating valve would not admit sufficient steam to the train pipe, would take it apart and block the steam valve open.  If the pressure ran up too high in the steam heat train pipe, would control it with the steam throttle at the boiler head.

115.  Q. How does the steam heat reducing valve control the pressure?

A. The inlet valve for live steam is opened and closed by the movement of a metallic diaphragm in the valve which is opened by spring pressure on one side and closed by steam pressure on the other side.  To regulate this pressure, stiffen the spring to carry more, weaken it to carry less by turning the handle connected to this spring either up or down.