By-pass valve for pressure-reducing valves.



J. O. DUNCAN. BY-PASS VALVE FOR PRESSURE REDUCING VALVES. APPLICATION FILED MAY 21, 1914. 1 20,9 1 8. I Patented Dec. 15, 1914. H 2 BHEETS-SHEET 1. awn/whom e czmw w 'ME NORRIS PETERS ca. PHOTO-LH'HPI LVASIIINhRN, J. C. DUNCAN. BY-PASS VALVE FOR PRESSURE REDUCING VALVES. APPLICATION FILED MAY 21. 1914. Patented Dec. 15,1914 2 SHEETS-SHEET 2. m 5 1 /,m7 4 w W5 7O 0 3 W a $2 h 0 a 00 uni IE q W/Immw 3 4/ THE NORRIS PETERS CO. PHOTG-LITHO.. WASHINGTON. D c, A UNITED sTA Esr T r ornron; JOH G. DU cAN, or B NromrLLINors. BY-PASS VALVE roe'rnnssunn rmnucme vALvEs. To all whom it may concern: Be it known that I, JOHN C. DUNCAN, a citizen of the United States, residing at particularly to bypass vali 'es to be used in conjunction therewith. j It is a well-known fat that the forms of pressure reducing valves now employed in connection with mine rescue apparatus often become clogged thereby preventing the proper passage of. gas therethrough. In view. of this fact it becomes expedient to provide a by-pass around the reducing valve. The primary object of myinvention is to provide a valve for such a bypass so constructed as to allow the two gases,-oXygen and nitrogen, to flow from the supply pipe into a mixing chamber from whichthey maybe conducted through the by-passand around the pressure reducing valve as be fore suggested. l 1 A secondary object of the invention is to construct the by-pass valve in such a manner as to accommodate a pressure gage. A still further object of the invention is' toconstruct the device in the most simple manner consistent with its proper operation. With these objects in view, the invention resides in certain novel features of construction and combination herein described and claimed and shown in the drawings wherein: Figure 1 is a side elevationof a pressure reducing valve showing the application of .my invention thereto. Fig. 2 is a plan view of the parts illustrated in Fig. 1 Fig. 3 is a central vertical longitudinal section taken upon the line 33 of Fig. 2; and Figs. 4 and 5 are transverse sections taken respectively upon the lines l-l and 5-- 5 of Fig. 2. In the accompanyingdrawings, I have illustrated my invention as employed in connection with a pressurereducing valve 1, the latter including the usual casing 2, inlet-- and outlet pipes 3 and lto and from said casing, diaphragm 5 carrying the usual split sleeve 6, and a valve .7 carried by said sleeve Specification of Letters Patent. and adapted to close or open the discharge ends 8 of oxygen and nitrogen supplyducts latter being here indicatedat 12. atellted Dec. 15,1914. 6 Application filed Maya, 1914. Serial K013140 61 i 3 i Asclearly seen in Fig. *3, the inner end, ofthe gas supply pipe 8 projects ;tlirough the slit in the'sleeve' 6 and is provided with depending .lugsor bosses 13, through which the ducts .10 discharge, said bosses being fdlS' posed in the inward path of the valve '7 which latter is here shown in the form ofan esternally threaded plug 14: which is pro videcL-on its, inner end, with a'ring shaped recess 15 within which asuitable packing 16 ,is" arranged, said packing serving to a effectually, check the flow of gas from the ducts 10 when the'diaphragm 5: is moved outwardly by pressure within the casing. The remaining features of the pressure re- 'ducin gv yalve are of common construction 1and; 1t.1sthought that the preceding description, taken in connection with the accompanying drawings, 7 will disclose its;v struction tothe necessary extent. I Asclearly shown in the [various figures of i the drawings, the outer end ofthe supply pipe. 3 is externally threadedand engaged with a threaded socket 17 which is formed in one end of a substantially.,cylindrical valve casing- 18, the ,opposite end'of said 7 casing being formed with a similar socket gen andv nitrogen supply pipes 21 and 22. Themember 20 is provided with independr ent inletopenings 23 which establishcome municationbetween thelpipes 21 and 22 and 19 in which one member20 of a coupling is y to provide attaching means for the hydroa pair of ducts 26 and 25 which pass longitudinallythrough the casing 18 andregister with'the ducts 10 in the :supplypipe 3. Thusit-will be seen that, under ordinary circumstances, the. nitrogen and oxygen flowing through thepipes 21 and 22 will be discharged. into the valve casing 2 from whichIthey, ina co-Iningled state ;will discharge through ;the outlet duct or passage certain conditions, the ports in the pressure gases from the valve casing, l8to the dis charg P P .As before suggested, howeverpiunder the use of the same maybe controlled, I have provided the following. means One side of the casing 18 is provided with a laterally extending boss 28 through one side of which, an outlet duct 29 discharges, theinner end of said duct communicating with the enlarged end 30 of a bore 30 which is formed in said casing at right angles to the boss 28, s'aid'bore preferably having its end rounded asfindicated at 31 to provide a valve seat. The outer portion of said bore is formed through an externally threaded boss 32 which'is formed integrally with the casing 18, said boss carrying a stufling box 33 through which a valve 3ft projects, sa d valve having an operating handle 35 on its outer endwhile its inner end is rounded as at 36 for engagement with the seat 31 of the bore 30. For the purpose of allowlng the oxygen and nitrogen to pass from their respective ducts into the bore 30, I provide a pair of branch ducts 37 and 38 which establish communication between said bore and the ducts 25 and 26. Thus it will be seen that when the valve 34 is rotated in the proper direction, the gases are free to pass through the branch ducts 37, ,and38 into the bore 30 from which they are discharged through the port 29 into the by-pass, 27 through which they now flow and into the outlet pipe 4. i It is to be noted that the gases are not allowed to mix until they enter the enlarged end of the bore'30' where the mixing takes place in atmospheric proportion, this being allowed by the'correct proportloning of the nitrogen'and' oxygen ducts. It is to be further noted, that, under ordinary circumstances, the reducing valve being in operation, all Communication between the ducts 25 and 26 and the by-pass 27 may be obs tructed by proper manipulation of the VHlYG v In" addition to the features above de scribed, the casing 18' is preferably provided with a third boss 38 which is disposed on the Opposite side of the casing from the'boss 2S and which has its extremity externally threaded as at 39 in order that a double acting pressure gage %0 maybe connected thereto through the instrumentality of a coupling 41. Extending through the boss 38 and registering with suitable ports in the pressureg'age 40, is a pair of brancliports 42 which establish communication between the-interior of the gage and the nitrogen and oxygen ducts 25 -and 26. It will therefore be seen that the pressure of the gases maybe readily seen whether the latter are allowed to flow through the reducing valve or through the by-pass. having a pairof gas ducts, a boss on the casing and having a bore, branch ducts from the gas ducts to said bore, a second boss on the casing and having an outlet duct passing therethrough and communicating with said bore, a third boss on the casing having a pair of outlets leading from the gas ducts in advance of the branch ducts, said last mentioned boss being provided for the attachment of a double acting pressure gage, and a valve in said bore. 2. A valve for the purpose set forth com prising an elongated casing having a threaded bore in each end, longitudinal gas ducts establishing communication between said bores, a boss on one side of the casing and having a bore and a stuffing box, a valve inthe bore and passing through the stuffing box, a second boss lying in the transverse pla'neof the aforesaid boss, and having an outlet duct leading from the bore therein, branch ducts from said gas ducts to said last mentioned bore and a third boss disposed in a transverse plane spaced from the aforesaid bosses and having a pair of outlets from said gas ducts. 3. A by-pass valve comprising a casing having a pair of gas ducts and a bore having its inner end enlargedand formed into a valve seat, a valve in said bore and shaped to conform 'to the seat, a pair of branch ducts from the gas ducts to the seat and a gas outlet from said enlarged end of the bore. i In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses. JOHN C. DUNCAN. I 'Witnesses: OTIS F. GLENN, H. O. MURPHY. I copies otthis pat'entmay be obtained for five cents each, by addressing the Commissioner of Patents, Washington. D. C. i



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