RETORT-BENCH APPURTENANCES
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A new departure from the ordinary apparatus is the “ Reeson ” go vernor, shown in Fig. 199. In. this apparatus the gasholder principle is done away with, and its
place is taken by a small flexible reservoir formed by a leather diaphragm. This dia-
phragm, being in direct commu-nication with the foul main, is caused to collapse or distend in accordance with. the volume of gas passing alongthe main. The movement of the diaphragm then operates the butterfly valve and increases or diminishes the free gas-way. In this case a water-loading attachment for regulating the intensity of the vacuum is shown. The chief merits of the governor are its com.pactn.ess and
Fig. 199.—“ Reeson ” Govebnor with Wateb-Loading Attachment.
the small possibility offered for deterioration by corrosion.
For the purpose of regula.tion, many medium-sized works ernploy an ordinary butterfly valve operated from a beil.
Fig. 200.—Langfoed’s Governor and Tower Arrangement.
A novel hydraulic main and gas take-off arrangement has been in.trodu.ced by Lang-ford. This is shown in Fig. 200. It will be seen that the gas is taken off from the top of the hydraulic, whilst the liquor overflow® by the weir valve at-tached to the tower and main-tains the seal. Originally, both gas and liquor were removed in the ordinary way via the weir valve on the hydraulic, but excessive oscillation of .the liquor occurred, which was particu-larly ob jectionable, owing to the peculiar type of ascension and. dip pipes, unsealing frequeiitly occurring. With the gas outlet moved to the top of the hydraulic, the vacuum from the
exhauster was exerted at right angles to the surface of the liquid, thus oscillation was considerably curtailed. The disposition of the retort-house governor will also be noticed, whilst a further uncommon practice is that of leading the carburetted. water gas direct to the hydraulic main, wliere it is intermixed with the coal gas.