and engineering journal . er flows freelj pasl the und pisti « head into th L id out through tin- v. t in th- water tuba. When the piston and piston rodare m tli positii ii. th- hole- in the walls of the hollow por-tion of the piston rod are blinded by the hod-, ol themechanism, and therefore the ml of the valve chest is nolonger in communication with atmosphere, bul i-that pressure can he set up in the end oi the valve clwhich will allow the valvi on in its normal manner, and operate the drill. As I moment that the water tube gets choked, and that th ; to flow. water pressure at the
and engineering journal . er flows freelj pasl the und pisti « head into th L id out through tin- v. t in th- water tuba. When the piston and piston rodare m tli positii ii. th- hole- in the walls of the hollow por-tion of the piston rod are blinded by the hod-, ol themechanism, and therefore the ml of the valve chest is nolonger in communication with atmosphere, bul i-that pressure can he set up in the end oi the valve clwhich will allow the valvi on in its normal manner, and operate the drill. As I moment that the water tube gets choked, and that th ; to flow. water pressure at the water outlel will then build up until [ual to th- wati r pn ssure at the wat -r inlet, and as Jar as the piston i~ concerned, these pressures will balance eachother. Tin spring will then tak ontrol and depress thepiston into it- original position, thus placing the end of thevalve chest in direct communication with atmosphere, and sostopping thi valve and the machine from working a- 1 Water Outlet £o tvt. oe. J^ vg. *. ^>/Va ic r /n le t. TME CLJfTAX ffOCJt DftfLL COATTBOI.* ACTUATED JSY WATJSn FLOhl. standard machine, and are only shown to illustrate thefunction of the mechanism more clearly. To enable thevalve to operate and so the machine to work, pressure andthen release has to he continually taking place in the endsof the valve chest, , in the space between the machinevalve A and the valve chest buffer plate (. It will readilvhe seen that if this space is connected direct to atmosphere,pressure cannot set up, the valve cannot operate, and sothe machine cannot work. Assume, first of all, that thewater is not flowing. The piston E is then held in the posi-tion shown on the sketch h\ the spring 11. The lower cudof the piston rod is hollow, and this hollow portion of thepistod rod is in direct communication with the end of thevalve chest, thus putting the end of the valve chest ill directcommunication with atmosphere through the holes in thewalls of the ho
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectmineralindustries
