US1139462A - Automatic shut-off valve. - Google Patents

Description

HWUREH 61 G. A. GASE.

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Patented May 11, 1915.

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Be it known that we. HARNESS)? il. SOUTl-i- WORTH and Grouse A. (less, citizens of the United States. residing at Cleveland, in the county of Cuyahoga and State of Ohio. have inv nted a certain new and useful. Improve ment in Automatic Shut-(Hf Valves. of which the following-1s tull. clear. and exact description, reference beingliad to the accompanying dra wings.

This invention relates to controlling valves and particularly for a valve adapted to be interposed in a passage for fluid leading to a receptacle to control the flow of such fluid to the receptacle, being dependent for its operation on the pressure Within said receptacle. v

In the particular embodiment shown herein, this invention is adapted for use in connection with a refrigerating apparatus of a type described in the application of Mr. lL-arrison H. Southworth, No. 732,807, filed November 22, 1912. In this application is described a system in WfllCll practically all of the refrigerant is driven efi from the generator-absorber to a. condenser during the period of generation, and all of the refrigerant passes from the condenser through the refrigerating coils back to the generator-ahsorber during the period of absorption. 1

Our shut-off valve is preferably interposed in the ymsszige leading from the condenser through th refrigerating coils to the absorber, and is adapted to be controlled by the pressure in the generntor-ubsorber iaving a passage connecting it therewith.

An object of the invention is to provide such a valve which shall be entirely auto matic and etlicient in its operation and which shall be simple in'construction, While being thoroughly tight.

Another object is to provide a valve which is normullvheld open by spring pressure to permit the passage of liquid under pres sure, from th condenser to the absorber, the valve being insured against closing by the pressure of such liquid but which may be closed by the pressure in the generatorabsorber rising to a point sufiieient to overcome the spring pressure and the pressure in the passage leading from the condenser.

Another object to conveniently arrange the valve so thatit maybe operated under .JRGE :1.

Ti) THE ICE i the upper spring 25. surrounding thevslve stem and ob ects of our inven ion come apparent in the folmwin forth in the. claims.

lfigure is a vertical central section or? our valve; l ig. 9. section of our valve on the line of Fig. 1; 3 is a detail of the list spring; Fig. 4 detail of valve plug.

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10. tion 12'. 01 a seatadupted to end "21 of the rs "I his tiling 5 a U1.

t. .ninunir. 1 pass-a5 i 1'? the chznnber l5; ringed at its end to form a. head. the lower face of which abuts the diaphragm H. interposed. between the upper shoulder of this head and face of the chamber 15., is 3, leaf tending normally to open the velve. Beneath the diaphragm is shown a bearing bloek 26, which is used merely to simplify the manufacture and to form a fiat surface limiting the. depression of the diaphragm. The liquid flows through the passage 15, past the valve plug, when open, and from a passage 24. The lower casing also colprises two chambered shells 39 and 31 clamped together stitheir margins by suit-' able bolts and embracing between them a metal diaphragm 34. The lower shell 31 is provided fi'lfil a nipple adapted. to be oered. shelis 1t) Petr t weed to the pressure in the generator-abmrber.

As shown, this diaphragm is of sufiicientl greater area than the diaphragm 14 to close the valve against the action of the springs 25 and 38 (hereinafter described), when the pressures above the diaphragm 1-l and. below the diaphragm 34 are equal and some what above atmospheric.

To transmit the upward movement of the diaphragm 34 to the valve 20, we have pr0- vided a pin 35, slidably journaled in the shell 11 and the block 26, with the upper end abutting the diaphragm l-l directly beneath the valve 20, and the lower end having a threaded engagement with the center of a disk 36, which abuts the upper side ofthe diaphragm 34 and bears over a major portion of its area. Interposed between the lower face of the upper shell 11 and the upper face of the flange 36, and surrounding the pin 35, we have provided a coiled compression spring 38 tending to depress this diaphragm. The chamber formed between the diaphragm 34 and the shell 30, provided with a vent 40 communicating with the atmosphere.

In use, the passage 16 of the upper shell 10 is connected by a suitable coupling with a line pipe leading to the condenser, and the opening 24.- communicates with a line pipe passing to the refrigerator coils. Thus it will be seen that the exposed upper end of the valve 20 is at all times subjected to the pressure of the liquid refrigerant in the condenser tendin to open the valve and, when the valve 18 open, the pressure of the liquid is communicated to the chamber 15 and so acts on the upper face of the diaphragm l4, tending to depress the same. When the valve is open, it will be seen that the liquid refrigerant has a clear passage from the condenser through the passages 16,117 and 25 to the pipes leading to the C01 s.

It will be noted that each of the diaphragms form one wall of the chambers communicating with their respective passages, and as these diaphragms are firmly gripped at their peripheries between the members of the casing and are held between suitable packing members, the chambers in communication with the passages are thoroughly liquid tight. This is particularly important in the construction in the upper casin in connection with the valve, as it enab es the liquid to pass thevalve without allowing it to escape from the casing, it being ver diflicult to provide means exterior to t e casing for closing this valve, which would not be liable to permit leakage.

shut-off valve is as =riod when the geny it necessary in order to enter the condenser that are in the generator be sonn lat in e of the condenser pressure. This ire in the generator, transmitted through a by-pass pipe to the lower side of the. diaphragm 34, is sufiicient to force the diaphiagn'i 34 upward against the combined pressures of the condenser pressure acting on the diaphragm 14, and the pressure of the springs 25 and 38, and so close the valve 20 and hold it closed thrmighout the cycle of generation. At a predetermined degree of low saturation in the generator, the cycle of (iperation is re versed and the generator being cooled acts as an absorber. At some point, the pressure in the gel ratorabsorbcr is decreased to such an t that the high pressure of the liquid refrigerant in the condenser acting on the conical face 21 of the valve 20, in addition to the pressure remaining in the chamber on the valve side of the diaphragm and the pressure of the springs 25v and 258, is suitlicient to open the valve, allowing the condenser pressure to be transmitted. to the chamber 15 and act on the upper side of the diaphragm to retain the valve in an open position. The liquid refrigerant then passes through the'passage 24 into a pipe and carried to the refrigerating coils. During this cycle of operation, it is of course necessary that the pressure in the generator-abscrher be considerably less than the pressure in the condenser. When all of the liquid refrigerant in the condenser is vaporized. the cycle of operation is again auti'miatically changed, and heat is applied to the generator. [\s the generator is heated, the pressure therein rises, and is exerted through a bypass pipe, upon the lower side of the diaphragm '34: as above described, closing the valve 21.

It will be seen from the foregoing description that We have provided a simple efiicient valve, which will adcomplish the purposes hereinbcfore set forth and when generator and used in connection with a refrigerating maone of said. casings having a central extension by which it is connected directly to the other, each casing having an internal chamber in which is a diaphra a distance piece slidably mounted in sai extension and bearing agalnst two diaphragms a spring tending to force one of the dlaphragms away from the other, a valve plug in the opposite side of said other diaphragm, a spring acting directly on the valve plug and tending to move it toward its diaphragm, passages to and from the space occupied by the valve plug, a passage to the opposite side of the other diaphragm, and a passage 'to the atmosphere from the other side of the chamber occupied by the last named diaphragm.

2. In a device of the character described, the combination of a two-part casing having an internal chamber, a diaphragm exr tending across said chamber, a second twopart casing having a smaller internal chamber, a diaphragm extending across the latter chamber, said secondwasing being secured to the first casing and having a flat surface adjacent to its diaphragm on the side toward the larger diaphragm and comparatively close to the smaller diaphragm, a slidable distance piece between the diaphragms, and a valve plug abutting the smaller diaphragm on the side opposite the distance piece and controlling a passage adapted when the plug'is away from its seat to communicate with the chamber on the valve side of the small diaphragm.

In testimony whereof, we hereunto afiix our signatures in the presence of two witnesses.

HARRISON H. SOUTHWORTHJ GEORGE A. case.

Witnesses:

Geo. J. SPLI'I'IORF- o R. S. SPENCER.

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