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THE PAHLOW PATENT HOSE COUPLINGS AND VALVES. 'The accompanying illustrations show features of a new hose coupling and which are the invention of Frank C. Pahlow, superintendent of the Ecorse yards of the Great Lakes En- gineering Works, Detroit. The coup- a full area through the hose no obstruction against of water may lodge cold weather and thus choke up the hose with ice. It permits a reduction in the size of hose used to carry a given quantity of air or water, inasmuch as the coupling does not de- crease the area offered for passage of valves, ling allows 'and presents which particles and freeze in 1--SECTION OF THE PAHLOW HOSE a COUPLING. FIG. the fluid, as is. usually the case. . itis effects a considerable saving in the cost of hose necessary to equip a given plant, as a smaller diameter hose may be used for a given Service. The coupling is also so designed that there can be no leakage of air or water through it, thus increasing : the efficiency of pneumatic and hyd- raulic plants and enabling the use of low pressure at the central station. The illustration, Fig. 1, is a section through the coupling and shows clearly : construction. The tapered ring A is slipped over the end of the hose and a tapered thimble B inserted on the inside, the two being forced together with the hose projecting slightly be- yond. The tapered ring C fits inside of the recess on the coupling nut U, allowing it to turn freely. The two NECTED. . its" "THE Marine REvIEw coupling nuts C are connected then by means of a threaded sleeve D. Turning the 'nuts C which are trée to move around the hose with all the projecting ends of the hose together, making an absolutely tight joint. This 'construction eliminates all gaskets, and also the use of wire for fastening the hose to the coupling shows the coupling made up. In Fig. 3 is shown a valve operated by the valve nut, which, when screwed up, unseats the valve admitting air into the hose and sealing the joint by means of the projecting end of the hose, as shown in Fig. 4. The valve nut and the coupling nut. are exact FIG. 6--PAHLOW HOSE COUPLING USED WITH TEE-CONNECTION. duplicates and may be used either for operating the valve and for form- ing the coupling. If the valve nut is slacked off, as shown in Fig. 5, the valve becomes seated and closes the air supply. The valve body contains a relief hole shown in Fig. 5, which allows the air to escape from the hose after the valve is seated. It is unnecessary to unscrew the valve nut entirely to shut off the air. Adaptations of this coupling com- prise a reducing coupling for the con- necting of different sizes of hose to- gether, a tee coupling shown in Fig. 6, and used in riveting work, where an operator may wuse alternately a FIGS. 3-5---VALVE USED IN CONNECTION WITH PAHLOW HOSE COUPLING. shorter lengths, Fig. 2. connected to the tee' and also two to the one which is attached the riveting hammer and to the other the chipping hammer. Fig. 7 shows a manifold connection, as used in the Ecorse yards of the Great Lakes Engineering Works: = Practical results obtained with the use of this coupling at the Ecorse yards where compressed air is used .extensively for riveting and chipping hammers and for drills, holders-on and forge fires comprise the cutting down of the operating machinery for fur- nishing compressed air from two 3,000-foot and one 2,000-foot capacity -- air compressors to two 3,000-foot machines and the maintenance of a pressure of 90 to 100 pounds instead FIG. 2--THE PAHLOW HOSE COUPLING CON- riveting and a chipping hammer. The 1 FIG. 7--PAHLOW HOSE COUPLING 'USED ON coupling nut on the main hose is aus MANIFOLD. a.