. Science of railways . Fig. Turbine Boiler Check Valve. The rotary seat insures an even wear and long life,and the mode of passage of fluids insures a cleanvalve at all times. HANCOCK BOILER CHECK VALVES These boiler check valves are made for a large variety ofapplications; bottom or side inlet, single or double patterns,with and without stop valves; also with flanged couplingsheld together with bolts instead of the usual screw thread andspanner nut. The valve itself, however, is of but two one, the disc is guided by short wings below the seat andby a stem extension above wh
. Science of railways . Fig. Turbine Boiler Check Valve. The rotary seat insures an even wear and long life,and the mode of passage of fluids insures a cleanvalve at all times. HANCOCK BOILER CHECK VALVES These boiler check valves are made for a large variety ofapplications; bottom or side inlet, single or double patterns,with and without stop valves; also with flanged couplingsheld together with bolts instead of the usual screw thread andspanner nut. The valve itself, however, is of but two one, the disc is guided by short wings below the seat andby a stem extension above which slides in a cap. By unscrew-. Hancock Vertical Check Valve ing the cap in this design, the valve may be inspected orreground while in place without removing the valve body ordisconnecting its piping. In the other type, the valve isguided by long wings below the seat and has no stem seat is removable from the valve body by disconnectinga union which makes it possible to readily remove both seatand valve for regrinding. 295 296 LOCOMOTIVE APPLIAXCE8. The Hancock boiler check valves are convenient whereboth injectors are on one side of the locomotive and especiallyso for backhead applications. The threaded joint ring of thisvalve affords a neat and desirable method of attaching todelivery pipe. The square flange construction and specialtypes of connection joints are noticeable features of thelarger valves.
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