. Railway mechanical engineer . 4 9Fig. 8 Operation of Valve BDetails of the Operating Mechanl. valve will be opened a mere crack. This results in wiredrawing the steam between the joint face of the valve andseat, quickly cutting these joint faces and causing the valveto leak. Leaking throttle valves have always been a source oftrouble, annoyance and much waste of fuel, but with theintroduction of the superheater other causes of fuel waste,shop expense and danger have been introduced, not before soapparent. When working with a throttle design permittingadmission of steam at a low level much pr
. Railway mechanical engineer . 4 9Fig. 8 Operation of Valve BDetails of the Operating Mechanl. valve will be opened a mere crack. This results in wiredrawing the steam between the joint face of the valve andseat, quickly cutting these joint faces and causing the valveto leak. Leaking throttle valves have always been a source oftrouble, annoyance and much waste of fuel, but with theintroduction of the superheater other causes of fuel waste,shop expense and danger have been introduced, not before soapparent. When working with a throttle design permittingadmission of steam at a low level much priming results andthe superheater units must serve to evaporate the excessmoisture, consequently reducing the resulting temperatureand efficiency. From a leaking throttle and the results ofevaporation in the units, courses of scale are built up in theheader at the discharge ends of the units until the openingsare almost or entirely closed. This prevents or retards circu-lation and the ends of the units next the fire become heated,are swelled spherically by the pressure and burst, a real sour
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
