. Electric railway journal . he circulating system to the valve cham-ber on each end of the vacuum pumps. When the piston has April 30, 1910.] reached the end of its stroke the rotative valve closes the open-ing on the suction side and establishes communication with thedischarge side; then air is drawn into the cylinder from thecirculating system. That is to say, after the pump has ex-hausted the air from the condenser it then exhausts the airfrom the circulating system, and does this without reducing thevolumetric capacity of the pump for removing air from thecondenser. The scheme of performi
. Electric railway journal . he circulating system to the valve cham-ber on each end of the vacuum pumps. When the piston has April 30, 1910.] reached the end of its stroke the rotative valve closes the open-ing on the suction side and establishes communication with thedischarge side; then air is drawn into the cylinder from thecirculating system. That is to say, after the pump has ex-hausted the air from the condenser it then exhausts the airfrom the circulating system, and does this without reducing thevolumetric capacity of the pump for removing air from thecondenser. The scheme of performing two services with thevacuum pump, however, does impose additional work on thesteam side of the unit, because it is called upon to compress agreater quantity of air to atmospheric pressure. It is statedthat when carrying in. vacuum in the condenser the vacuumin the circulating system adjusts itself to the amount necessaryto raise the water from the river to the circulating pump, de-pending upon the stage of the Cincinnati Turbine Station—Transverse Section of HuntStreet Substation The dry-vacuum pumps are protected against water chargeby the use of a 14-in. vacuum header installed 115 ft. abovelow-water level and 40 ft. above the main floor. The vacuumheader, from which the vacuum pump exhausts the air, is con-nected with the suction side of the large reversing valveswhich form an essential part of the circulating-water vacuum header is drained by gravity to a water seal in thebasement, 90 ft. below. This seal is made of a 10-in. pipe 18ft. long, into which the 4-in. drain pipe has been inserted. Theuse of the vacuum header and connections with the circulating-water system not only permits the water to be lifted for prim-ing the pumps, but is of principal importance in connectionwith the scheme for reversing the flow through the intake anddischarge pipes, since it prevents the circulating pumps fromlosing water when reversing under load. FEED WATEK H
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