. Ingegnere americano e giornale ferroviario. È completamente equilibrato e che alcune valvole pis-ton non sono ben bilanciate come il normale D valvecan essere. In l<ig. 5 è mostrato quest'ultimo tipo di valvola e da qui sono riportati i dati da cui si può ottenere una migliore valutazione del valoredel bilanciamento dei diversi tipi di valvole. Posizione della valvola. Pressione totale degli anelli di forzamento della valvola contro la sede in libbre. ;valvole mostrate in Fig. 3. Fig. 4. Fig. 5. Centrale (assenza di vapore nel cilindro).. 32.504 6,460 16.160 inizio ingresso 22, S94 2,356 9,960 14 apertura porto 26,097 1,330 9,714 H apertura porto

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. American engineer and railroad journal . is balanced thoroughly and that some pis-ton valves are not as well balanced as the ordinary D valvecan be. In l<ig. 5 is shown the latter type of valve and thetable gives data from which a better appreciation of the valueof the balancing of the different types of valves may be ob-tained. Location of valve. Total pressure forcing rings of valve against seat in pounds. ;Valves shown In Fig. 3. Fig. 4. Fig. 5. Central (no steam in cylinder).. 32.504 6, 460 16.160 Beginning of admission 22, S94 2, 356 9, 960 14 Port opening 26, 097 1, 330 9, 714 H Port opening 29, 301 1, 330 9, 478 % Port opening 29.678 2, 356 8, 132 Full port opening 19.690 3.895 7, 382 At cut oft 32, 504 2, 356 16.106 The above figures allow for the steam pressure in the steamchest and the steam pressure in the cylinder after the firstexhaust, except in first location, marked Central. That the use of packing rings on piston valves may seriouslyaffect the balancing is more generally appreciated than it was 5/iqhf C/earancff Fig. 6.. Cast Iron 5o//d^ ffing, an easy firin the Cyfine^r. ^3 TfK Sp//t ffmgs (of fiara Sroniejtt/mea larger than r/ie Cy/mderand then cut. a year ago, and efforts have gone so far even as recent attemptsto balance the packing rings on the main pistons, and some ofthe railroads have been approached by inventors who claimto have accomplished such a result; it is extremely doubtful, however, whether the rings can be balanced and fulfill theirfunction regardless of some alleged tests to the contrary andpatents issued covering the designs. [We have taken the liberty to add Fig. 6 to the illustrationspresented by IVIr. Whyte in order to show a method of mak-ing piston packing rings devised by Sir John Durston, recentlydescribed in Engineering. This ring is split and is restrictedso that it can open only to a certain extent. The carrier is ofcast-iron with two hard bronze rings having lips. A smallclearance is allowed between the carrier and the rings, so

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1890
• booksubjectrailroadengineering