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238 MARINE REVIEW ausunanonnnnenanennnananansaaaTenaseenes seen e nT Nt g ig 584 BHEHS COMPLETE BOILER TUBE CLEANER (ABOVE) COMPRISING TOR AND ELECTRIC CABLE WITH ORDINARY LIGHT: SOCKET. AND CHUCK IN DETAIL once set the delivery pressure will from 2% inches and larger, the body remain constant. Serious difficulties is iron. Steam, air or water. under may arise from carelessly regulated pressure may be controlled with this or poorly working valves. valve. The accompanying illustration shows [y operation, steam entering at A a cross section of a 2'%-inch. and passes through the main valve port larger pressure regulator valve as coOM- f/f and out to the outlet B. The in- structed by the Foster [Engineering Co. Newark, N. J: This valve is capable of reducing 300 pounds per square inch and somewhat higher, to from zero pressure to within 15 per cent of the initial pressure. It is single seated, auxiliary operated, has only one small diaphragm and if carefully applied is capable of regulat- ing the pressure closely, within one pound or so. The slight movement required of the auxiliary valve, which is the controlling feature, with in- stantaneous response, makes it work well for loads subject to sudden fluc- tuation. This valve will work equally well in any position as long as the inlet and outlet properly connected. There are Watig tt is entirely self-contained and only one adjusting spring is used. Other ad- vantages pointed to are the removable piston cylinder and the interchange- ability of parts. A wide range of pressures on the delivery side is pos- sible with the single adjusting spring and diaphragm. The design follows modern engineering practice, so that with its rugged construction little chance exists of the valve getting out of order. In sizes from % to 2 inches the material used is all composition, are no outside itial pressure acts through the passage C, enters chamber P and thence to the top of piston S through ports L thereby opening the main valve T. The delivery pressure, passing through the port E raises the diaphragm U against the pressure spring V and allows the spring X to close the aux- iliary valve Y. . The ber J is then equalized by the re- duced pressure passing, through ports G to the underside of the piston § and this allows the spring Z to close the main valve, which is then held to its seat by the initial pressure. Upon, any reduction of the delivery pressure acting on the diaphragm, the spring V forces it down and_ opens the auxiliary valve Y admitting steam to the top of. pistomw S as before ex- plained. pressure in cham- The delivery pressure is controlled by adjusting screw W, tightening the tension of spring V, increases the dis- charge pressure or vice versa. After having once made the adjustment, the delivery pressure will remain constant regardless of any change in volume of discharge or initial pressure, so long as the latter remains in excess of the delivery pressure. Turning to the right increases and to the left decreases the delivery pressure. Jaumne,. 1925 WIRE BRUSH, CHUCK, FLEXIBLE SHAFTING, COUPLING, MO- (BELOW) STEEL WIRE BRUSH Use New Method to Clean Leviathan's Boilers When serious attention was finally di- rected to the reconditioning of the Lrvra- THAN after numerous surveys and inspec- and plans were ready and money appropriated, the time came for tions the action. It devolved on the men chosen to supervise and carry on this work to get down to particular cases. Among the many practical problems which the engineering representatives, Messrs. Alexander and Harrison of Gibbs Bros., Inc., New York were called upon to solve on board the LEVIATHAN at the yard of the Newport News Ship- building & Drydock Co., was that of thoroughly cleaning the boilers. The problem was complicated by the fact that these boilers are of the modified Yarrow type with comparatively small diameter tubes, many of which have severe and abrupt bends. Any cleaning these tubes had received during the Lr- VIATHAN’S tenure as a troopship, oper- ated by the navy, as far as any records available indicate, had been done, in so far as it was done at.all, by slow, laborious and unsatisfactory hand meth- ods probably by drawing through the tubes flexible wire with a few links of chain or a small wire brush on_ the end. At any rate, Messrs. Alexander and Harrison found no apparatus on board for doing this work efficiently and economically. They however, did find on board several sections of flex- ible. shafting, evidently left on board from the time of the operation of