Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . des forms a cylindrical chamber which is incommunication by means of small piping with the stage to be con-trolled, and from which the bleeder steam is to be taken. BLEEDER OR EXTRACTION TURBINES 343 Movements of the diaphragm are opposed by the spiral spring(36) which can be set to maintain any desired steam pressure inthe stage. Careful inspection of Fig. i8sd shows that the ports in thering valve are not all of the same size but are of progressivelyincreasing width ar
Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . des forms a cylindrical chamber which is incommunication by means of small piping with the stage to be con-trolled, and from which the bleeder steam is to be taken. BLEEDER OR EXTRACTION TURBINES 343 Movements of the diaphragm are opposed by the spiral spring(36) which can be set to maintain any desired steam pressure inthe stage. Careful inspection of Fig. i8sd shows that the ports in thering valve are not all of the same size but are of progressivelyincreasing width around the circumference from the narrowest tothe largest. The narrow parts begin closing up on the first move-ment of the valve. There are four groups. The second groupbegins closing only after the first or narrowest set is fully closed. A balance-plate (Fig. i8sg) is put on top of the ring valve(Fig. i85d) for the purpose of assisting in equalizing the pres-sure on the two sides of the valve, and thus reducing the forcerequired to move it, since the steam pressure is not effectiveon the whole surface of the ring Fig. i85g. Nozzle-plate for Curtis Ring Valve. It is comparatively a very easy matter to remove some of thesteam which has been partly expanded in the turbine by theuse of suitable automatic or hand-controlled valves even whenthe quantity of steam required at a constant pressure in such ableeder line is quite variable. By this method it is possible to 344 THE STEAM TURBINE extract the greatest amount normally possible as required forgenerating power and at the same time supplying at a reason-ably constant pressure usually about atmospheric, or about5 pounds above, the requirements for heating or industrialpurposes. Fig. 185I1 shows the satisfactory filling of the blades of animpulse turbine of the bleeder type.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkwiley, books
