. American engineer and railroad journal . frames. The side frame extensions are curved nroundfor extra clearance and present a broad surface where theyare bolted to the angle iron crossings, which secures increasedstrength at this point. LOCOMOTIVE BLOW-OFF VALVE. The detail construction of the Lunkenheimer improved loco-motive blow-off valve is shown by the accompanying illustra-tion. In its construction is involved the use of twiO distinctvalves within a single body: one of these is for regular the other is provided for emergency service, to be oper-ated only in case of possible f
. American engineer and railroad journal . frames. The side frame extensions are curved nroundfor extra clearance and present a broad surface where theyare bolted to the angle iron crossings, which secures increasedstrength at this point. LOCOMOTIVE BLOW-OFF VALVE. The detail construction of the Lunkenheimer improved loco-motive blow-off valve is shown by the accompanying illustra-tion. In its construction is involved the use of twiO distinctvalves within a single body: one of these is for regular the other is provided for emergency service, to be oper-ated only in case of possible failure of the main valve. Thisemergency provision is the means of avoiding considerableannoyance and expense. The valve is operated by hand, and isso constructed as to eliminate all tendencies to fouling, stick-ing or leaking; it is positive in every action. Connection to the boiler is made at D, while the outlet fromthe valve is through the malleable iron ell terminating at main disc and seat are at the lower end of the stem S, the. LUNKENHEIMER LOCOMOTIVE BLOW-OFF VALVE. operation of the former being effected by vertical movementof the stem S, through suitable levers attached to the fork P,and carried to a readily accessible point on the running lifting the main valve as high as it will go, full and uncon-tracted area is provided for the blow-off passage from C to emergency feature, for use in case of possible failure ofthe main valve, is provided in the key or taper plug valve E,made a ground fit in the body I and operated when requiredby rotation of the lever handle J. Ordinarily, this emergencykey remains in the open position, as shown, giving free pas-sage through from the inlet to the main valve. Should thelatter leak or give trouble in any respect, preventing its tightclosing, the key may be rotated to close the inlet opening. Thenthe main valve is raised to its extreme open position and allblowing-off operations are performed by manipulation of the
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
