. Journal of the New England Water Works Association . r-tight and able to withstand operationin the open exposed to snow and ice, and even while under water. Ob-viously the control apparatus can be ruggedly constructed and inclosedin a moisture and fool-proof casing so that :i complete system may beI milt up, all of the operating parts of which are fully protected againstoutside influences. By the employment of lead and steel covered cable, the conductorsmav be laid in an open t lench. 268 ELECTRIFICATION OF GATE VALVES. Valve Operating Apparatus. The large valves in street vaults present a n
. Journal of the New England Water Works Association . r-tight and able to withstand operationin the open exposed to snow and ice, and even while under water. Ob-viously the control apparatus can be ruggedly constructed and inclosedin a moisture and fool-proof casing so that :i complete system may beI milt up, all of the operating parts of which are fully protected againstoutside influences. By the employment of lead and steel covered cable, the conductorsmav be laid in an open t lench. 268 ELECTRIFICATION OF GATE VALVES. Valve Operating Apparatus. The large valves in street vaults present a number of difficulties forthe following reasons. Frequently the valve is very old, corroded anddifficult to operate. It is required to be closed against velocity due tobreak in the line. The control apparatus must be of such a size and natureas to pass through the ordinary man hole. Space is limited in the vault,making it imperative that the installation be made with as little labor aspossible. The apparatus must of course be absolutely water and damp. 30-in. Inside Screw Valve Fitted with Dean Control. proof, and should not be affected by water that may collect in the standing idle for long periods must not affect the operativeness ofthe system. The equipment must be self-contained, self-lubricating andunaffected by extremes of temperature. For the protection of the valvethe mechanism must be provided with means positively operating to stopthe gate at each extreme of its travel. Dean Control System. This system has been especially developed for the electrical operationof valves and incorporates all of the essentials which long experience hasshown to be necessary for these valves. It is the only complete system ofvalve control 1 hat has been devised,and hundreds of installations in variouskinds of service are in satisfactory operation throughout the country. DEAN. 269 There are five important characteristics of the Dean System 1 —It is a single standardized unit. 2
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