« НазадПродовжити »
Feed-Valve Pipe Brackets
reversed the order of passing the air through the feed valve, but by turning the valve upside-down, the port connections were made to coincide, and they were so inverted in the No. 5 and all preceding E-T equipments.
The crossed passage, “F” pipe bracket is used in the No. 6 E-T equipment, and, as the name indicates, the passages in this pipe bracket are crossed, so that
main-reservoir air entering at the right-hand pipe connection will pass to the left-hand port from which it enters the feed valve, leaving through the righthand port to the left-hand pipe connection, which is to the feed-valve pipe leading to the automatic
Fig. 42.-Diagram of B-6 Feed Valve. Open position.
MR—Main-reservoir pipe. FVP-Feed-valve pe.
Copyright, 1909, by The Norman W. Henley Publishing Co.
brake-valve. In order that the feed valve may be correctly placed, in the No. 6 equipment, the new, crossedpassage pipe bracket has a lug cast upon it that interferes with the attachment of the feed valve unless it is placed right-side
up. The improvements in the B-6 FEED VALVE permit charging to the regulated pressure somewhat quicker, and maintaining the pressure more accurately than the old style did, under the variable conditions of short and long trains, and of good and poor maintenance. Also, the regulation can be quickly and accurately changed from 70 pounds to 110 pounds brake-pipe pressure, or the reverse, by turning the hand wheel until the pin strikes the opposite stop; or any other pressures as the minimum and maximum can be used, by adjusting the stops to secure the desired amount.
Figs. 42 and 43 are diagrammatic views of the FEED VALVE and PIPE BRACKET, having the ports and operating parts in one plane to facilitate description; and to simplify description the direct passage pipe-bracket is represented. The names of the parts shown in the diagrams are as follows: 2, VALVE BODY; 3, PIPE BRACKET; 5, CAP NUT; 6, PISTON SPRING; 7, PISTONSPRING TIP; 8, SUPPLY-VALVE PISTON; 9, SUPPLY VALVE; 10, SUPPLY-VALVE SPRING; 11, REGULATINGVALVE CAP; 12, REGULATING VALVE; 13, REGULATING-VALVE SPRING; 14, DIAPHRAGM; 15, DIAPHRAGM
Detail Parts of Feed Valve
RING; 16, DIAPHRAGM SPINDLE; 17, REGULATING SPRING; 18, SPRING Box; 19, UPPER STOP; 20, LOWER STOP; 21, STOP SCREW; 22, ADJUSTING HANDLE.
The feed valve consists of two sets of operating parts, the supply (upper), and regulating (lower). The supply parts, which control the flow of air through the valve, consist of the supply valve 9 and its spring 10, the supply-valve piston 8 and its spring 6. The regulating parts consist of the regulating valve 12, regulating-valve spring 13, diaphragm 14, diaphragm spindle 16, regulating spring 17, and regulating handle 22.
Referring to Fig. 42 in which the feed valve is represented in the OPEN POSITION, main-reservoir air enters through port a,a to the supply-valve chamber B, forces supply-valve piston 8 to the left, compresses piston spring 6, and causes the port in supply valve 9 to register with port c in the seat; this permits air to pass through ports c and d to the feed-valve pipe at FVP, the pressure of which flows through port e to diaphragm chamber L.
It will be observed that no packing is used in piston 8, as a certain amount of air leakage past it is desirable, and necessary to the proper operation of the valve; air feeding by the piston to the left can not accumulate in chamber G above feed-valve pipe pressure at this time, for regulating valve 12 is open and connects chamber G to the feed-valve pipe, through passage h, port K,