The Locomotive . es and stripthreads from fittings. Such an accident is hard on the equipment andeven worse for the attendant. To avoid this danger, the blowing valve should be slow-acting. However, the sealing device may beeither a similar valve, a quarter-turn valve, or a plug cock. The sealing valve is placed between the blowing valve andthe boiler and should always be opened first and closed last. In thisway the blowing valve is obliged to stand most of the punishment,while the other valve — which is depended on for tightness — is spared. 1929. THK LOCOMOTIVE 145 Any valve in a blow-off li
The Locomotive . es and stripthreads from fittings. Such an accident is hard on the equipment andeven worse for the attendant. To avoid this danger, the blowing valve should be slow-acting. However, the sealing device may beeither a similar valve, a quarter-turn valve, or a plug cock. The sealing valve is placed between the blowing valve andthe boiler and should always be opened first and closed last. In thisway the blowing valve is obliged to stand most of the punishment,while the other valve — which is depended on for tightness — is spared. 1929. THK LOCOMOTIVE 145 Any valve in a blow-off line should be of a type having a free,unobstructed passage. The ordinary globe valve, and others that havepockets in which sediment and scale can collect, are not suitable. Anangle valve is usually very satisfactory and is regarded by many asthe type best suited to this work. The plug cock, when one is used, should be of the type that has atthe top a stuffing gland or guard which will hold the plug securely in. Op£/7 Last — C/aseFirjt Quarter-turn P/ug Cac/fOpen F/rst — C/ose Last Discharge
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Keywords: ., bookauthorhartfordsteamboilerin, bookcentury1800, bookdecade1860
