Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . Figure 78 PISTON VALVES AND BALANCED VALVES 173 valve operates, being an exact duplicate of the cylin-der valve seat and set in alignment therewith, what-ever conditionsexist on one facebf the valve mustalso exist on theDther face. Theavails of the valveare provided withborts, which passfrom face to face pf the valve. These ports are functional, and their|ength and width depend upon whether the valve isjto be double or single acting; t
Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . Figure 78 PISTON VALVES AND BALANCED VALVES 173 valve operates, being an exact duplicate of the cylin-der valve seat and set in alignment therewith, what-ever conditionsexist on one facebf the valve mustalso exist on theDther face. Theavails of the valveare provided withborts, which passfrom face to face pf the valve. These ports are functional, and their|ength and width depend upon whether the valve isjto be double or single acting; that is, whether or not double admissionand double ex-haust openings aredesired. The valveunder consider-ation here is ofthe double ing type. Balance Plate. The Balance Plate, Fig. 79, contains the balancing cones MC and PC (main cone and port cone), and two centering ring grooves which register with like grooves in pressure plate. It also upplies the means for double admission and double :xhaust openings by admitting and exhausting steam. 174 LOCOMOTIVE ENGINEERING at the face of the plate at top of valve simultaneouslywith admission and exhaust at valve face and cylindervalve seat. The face of the balance plate, Fig. 80, is an exactduplicate of the cylinder valve seat and forms a secondvalve seat against which the valve operates in unisonwith its operation on the cylinder valve seat, thesecond seat being held by means of the centering ringsCR, Fig. 81, in exact alignment with the valve seatproper. The back or opposite side of the balance plate, Fig. 84, contains thefollowing cones: one largeor main cone (MC) and twosmall or port cones (PC) onthe interior of the maincone, and on which thepacking rings are placed,which forms the balancingfeature to the valve, and thecentering ring cones. Thebalance plate is providedwith wings (BW) which fitI-16 in. loose into the wingsof the pressure plate (or into the steam chest itself),preventing excessive movement of plate. Taper orbe
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectlocomot, bookyear1916
