. Journal of the New England Water Works Association . 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—The unit may be attached to existing valves with a minimum of effort and without shutting down the —Operation is positive and accurate, and does not depend upon the momentum or drift of the moving parts to seat the valve. 4 — The motor exerts a high initial torque and affords a sufficientreserve of power
. Journal of the New England Water Works Association . 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—The unit may be attached to existing valves with a minimum of effort and without shutting down the —Operation is positive and accurate, and does not depend upon the momentum or drift of the moving parts to seat the valve. 4 — The motor exerts a high initial torque and affords a sufficientreserve of power for operating the valve under various conditions ofvelocity and pressure. 5 —The complete system is totally inclosed and water-proof. The Dean Unit embraces the driving motor, reduction gears, andlimit trip mechanism all inclosed in a standardized moisture-proof are built in a series of types embracing the complete range ofvalve sizes. Each unit is equipped with feet provided with four boltholes for attachment to the Electrically Operated Valve Manhole Cover Construction. Indicating Devices for Valves. For showing the position of the valve gate two types of indicatorsare employed. At the valve a mechanical indicator is installed whichshows upon a dial how many turns have been made in opening the valveso that danger of jamming the valve parts is eliminated. Where it is desired to operate t he valve from a distant point an elect vrcal indicating system is employed so that an operator at the remote stationcan note the position of the gate from a conveniently placed dial. Inboth of these systems the mechanism is thoroughly protected from moistureand dust by a suitable casing. 270 electrification of gate valves. Dean Unit. The motor of the Dean Unit is completely inclosed and water-proofand develops an extremely high torque. The normal speed is 2 , and through a system of worm and planetary gearing the slowspeed shaft which drives the valv
Size: 2036px × 1228px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookidjournalofnew, bookyear1922
