Fig. 3.
One of the most successful and enduring injectors in use is the Monitor, the distinguishing feature of which is, that the injector is constructed with fixed nozzles, that insure great durability, combined with certainty of action. The Monitor injector is shown in section in [Fig. 3]. To start the injector, the middle cock is opened, which is the lifting-jet. When water appears at the overflow, the steam-valve is opened, and the lifting-jet closed. The work of the injector is regulated by the lazy-cock, which is the bottom handle. A movable valve, operated by an eccentric on the stem, is now employed as a lazy-cock; a common cock having been found troublesome during frosty weather. The combining-tube is attached to the line-check, and can be taken out with the check, which provides an easy means of effecting examination or repairs.
THE KORTING INJECTOR.
Fig. 4.
An examination of [Fig. 4] will show that this injector is a double-tube instrument; the first tube being proportioned for raising and delivering the water under pressure to the second one, which completes the operation of forcing the water into the boiler. This arrangement enables the injector to be worked through a wide range of steam-pressures without any adjustment of parts. By making the first tube proportionately small, a high power of suction is obtained, which enables the injector to feed water of such high temperature that it may be delivered into the boiler above the boiling-point. The Korting injector is operated entirely by one handle, and requires no instruction to teach its working. The feed is regulated by the patent combined regulation-valve and dirt-stop, which regulates the supply of water, and prevents the possibility of dirt reaching the injector.
THE HANCOCK INSPIRATOR.
Fig. 5.
[Fig. 5] gives a cross-section of the Hancock inspirator. It consists essentially of a lifting-jet and lifting-nozzle, combined with a forcing-jet and force-nozzle or injector; steam being admitted to both of these nozzles whenever the inspirator is working, to deliver the supply-water to the force-nozzle, and to force it through the nozzle into the boiler. Although both the lifting and forcing nozzles are fixed, their proportion, one to the other, is such that the inspirator requires no adjustment for changes in steam-pressure or water-supply; the waste-valve being kept closed while the instrument is in operation, except at the time of starting. The duplex nozzle arrangement of the Hancock inspirator enables that instrument to feed water of high temperature. In this respect it will act as well as the ordinary pump, besides having all the advantages of an injector. A form of inspirator is made specially for locomotive service, which is operated by a single handle.