PLATE 89-No. 3-E CONTROL VALVE, P-C PASSENGER (Diagrammatic View) CAR BRAKE EQUIPMENT Graduated Release and Release, Charging Pressure Chamber Only PUBLISHED MONTHLY BY THE BROTHERHOOD OF LOCOMOTIVE FIREMEN AND ENGINEMEN COPYRIGHT, 1914, BY JOHN F. MCNAMEE Entered as Second-Class Matter January 21, 1914, at the Post Office at Columbus, Ohio, under the Act of Congress of March 8, 1879. a Plate 89-No. 3-E Control Valve, P-C Passenger Car Brake Equipment (Diagrammatic View)-Graduated Release, and Release: Charging Pressure Chamber Only. Plate 89 of the Westinghouse Air Brake Series of the Locomotive Firemen and Enginemen's Magazine Educational Charts shows in diagrammatic view section of the No. 3-E CONTROL VALVE of the P-C Passenger Car Brake Equipment in its full brake-releasing position, or as termed "GRADUATED RELEASE, AND RELEASE: CHARGING PRESSURE CHAMBER ONLY." If the brake-pipe recharge is only partial, terminating when a portion of the brake-cylinder pressure has been discharged, then we may refer to the present Control Valve position as that of "graduated release," but it will be followed by certain of the operative parts automatically reacting to their lapped positions; on the other hand, if the recharging of the brake-pipe pressure is continued for a sufficient length of time, all of the operative parts will remain as shown in the plate and the position may be termed "release." Plate 89 is one of the charts of the Control Valve series -2 NOVEMBER 1914 which is required to show the operating parts in their entirety. The above refers to the effects from graduated release cap" is in the position brake-pipe recharge when the "direct and (as shown in the plate) that provides for the Control Valve functioning in either direct or graduated release; on the other hand, if the cap is set for direct release, when the equalizing and release pistons have been moved to the positions as shown in the present chart the brakecylinder pressure will be entirely exhausted, no matter if the engineer's valve be immediately placed in the lap position. The operation under this condition will be explained in connection with a future appearing chart. It should be understood that in releasing the P-C brake a very slight increase in brake-pipe pressure (from 1 to 2 pounds) above that remaining in the pressure chamber, is sufficient to move the parts of the Control Valve through the successive positions-charted by us as momentary flashes-termed Preliminary and Secondary Release, in the two preceding views, to their final positions as represented here in Plate 89. (525) Pressure in chamber F having been en |