US892515A - Safety-valve for car-heating appliances. - Google Patents

Description

PATENTED JULY 7, 1908,

E. H. GOLD.

SAFETY VALVE FOR OAR HEATING APPLIANCES.

APPLICATION FILED MAR. 7, 190 1.

2 SHEETS-SHEET 1.

M7275 as 6 5 I QLW-I/AAVLM/ 5173 LC LL'? No. 892.515. PATENTED JULY 7, 1908.

B. H. GOLD.

SAFETY VALVE FOR OAR HEATING APPLIANCES.

APPLICATION FILED MAR. 7, 1904.

'2 BHEETS-SHEET 2.

UNirnn EGBERT Hv GOLF), OF CHICAGO, lLLINQlS.

SAFETY-VALVE GAE-HEATING Application filed March 7, 190

Specification of Letters latent.

To all whom at may concern:

Be it" known that I, EGBERT ll. (loin, a citizen of the United States, residing at Chicago, in the county of Cook and State of llli- 5 1101s, have invented certain new and useful Improvements in Safety-Valves for Car- Heating Appliances, of which the following is a specification.

- My invention relates to improvements in valves, especially adapted for and combined with car heating systems of the ,Plilllifill type, inwhich a circulating medium passes through a closed circulating system. in heating systoms of this type, it is usual to irovide in the heating system a heater, in t ie form of a stove, in operative contact with a coil, which forms part of the circulating system. it is also usual to rovide an expansion tank to which a riser Feeds from the coil within the o sto e.

As ordinarily constructed, the stove constitutes the emergency heater and is ordinarily out of use, the common heating device "being a steam jacket or steam heater oi some sort in operative contact with the circulating s s em and supplied with live steam from t e locomotive. Consequently, the sys cm is commonly used, the tempo .rturo a pressure within the circulating never exceed that of the temperature can? pressure within the train pipe, which suplies steam from the locomotive, and, there ore, no danger of overheating the circulating medium need be feared from that source.

- en, however, the emergency heater is put in operation, the heating nicdiuni being tire of some sortap led llll'l. to a roll a dbrza the enicrgejoncv healer, there is always possibility of ox heating, the c wulaiin; Ine

dinni, of creating a dan 'erous hi," i pressure, especially if steam no genciaied within the closed circulating system. Consequently, itis usual to provide a safety valve at some oint in the circulating system and usually in connection with the eXpansion tank. Inasmuch, however, as the emergency heater is not commonly used, the safety valve will ordinarily remain unopened for long neriods of time, W' 5; the result that safety'valvcs of the t es commonly used will become so corr d ed to their seat that the pressure Within the circulating system will not be sufficient to unseat the val e until it h or larexcecded the danger point. J l h heretofore recogn.

used whereby a section of the expansion tank is weakened so that a section of the tank may be blown out bodily before the pressure within the circulating system reaches the danger point, Such a, device is, of course, objectionable because it destroys the tank or the part with which the blown-out section was integral. Furthermore, such a device not only detroys a part of the apparatus, but it does not go to the source of the evil, to wit. lire in the stove, and the ire in the stove. even if an ordinary safety-valve be operated successfully, will continue to heat the ulready' "overheated circulating system and cause a constant blow-oil from the safety-- valve until the water in the system is are hausted and the coil within the stove burned out. The replacing of this coil is a matter of much trouble, delay, annoyance and expense.

Among the objects of my invention, therefore, are to provide a device which shall be at all times certain and reliable in action, which shall certainly operate to relieve ibe pressure in the circulating or stem before it can reach the dun 3r int, while, at thesanie tune, the 0pc" tion of the device will not destroy any part ol' the apparatus.

A turther ob ect of my smear is is to pro-- 'vide means for automalically reducing the lire whom-mu my soblow oll' steani or water.

These and such other objects as may hereafter appear are attained by my invention, which is embodied in what I consider its preferred form, in the drawings hereto athed, as hereinafter (,lescribed. nigure 1 is a diagrannnatic view of a per-- lion of a car heating system showing the relation oi the. principal parts thereof, and the -valve operates to manner in Wiich the preferred l'orni of in device is mounted. Fig. 12 is a sectional view through the preferred form of my device 1 and Fig- 5 is a cross-sectional view on the line 3-3 of Fig. 2, looking in the direction indicated by the arrows. Fig. l isa vertical cross-section through the three-way cock by means of which the water may bc sent from the safety valve either into the fire box of the heater or be permitted to escape.

Like letters of reference indicate the same parts in the several figures of the drawings.

'l ielerring by letter to the accompanying drg. at: th lo-or of a car."

on type, C, are

I i-JO unconnected can clamped at flexible diaphragm 10.

' the c amping ring 12.

culating systems, each of which-ts irtpperative connection with the heaterB, one of the circulating systems being used to heat one side of the car, and the other toheat the other side of the car.

D, D are the expansion tanks of the two circulating systems, respectively. V E E. are the safety-valves mounted upon the tanks D, D, respectively F is a discharge pipe leading from the safetyvalve E to a three-way cock G. His

a similar pipe leading from the safety-valve E to the pipe F.

I is a ipe leading from the three-way cock to the 're-boX of the heater B," and J is. a similar pipe leading through the bottom of the car. The three-way cock Gr is so ar ranged that it may be operated at will either to connect the pipe F with the discharge.

pipe J or to connect the pipe F with the pipe I leading into the fire-l1-ox of the heater B.

Referring now to Fig. 2, my improved valve E is constructed'as follows: A casing 1 is provided with a valve-chamber 2, and

with an inlet port 3 leading into said valve-' chamber. A. valve 4 is arranged within the valve-chamber 2 to close a passageway 5,

leading to an outlet chamber 6, from which leads an outlet port 7. Between the rear 'end of the valve-stem 8 and a cap 9,-into these clampin members, but it is important that the diaphragm be accurately centered in the device to insure the proper working of the valve 4, and, in case the full clamping faces of the casing members 1 and 11 are utilized, it is also important that the diaphragm shall not project beyond these clam ing faces so as to engage the threads of By this arrangement, the diaphragms can, if desired be stamped with a marginal rib which shall fit the rib and depression on the members 1 and 11, so that the accurate centering of the diaphragm in the device becomes substantially automatic. Of course, any suitable complementaryprojection and depression on the clamping faces willserve this purpose. It will also be noted that the ca 9 projectsin such a manner as to engage s ioulders on the casing 11 so as to serve as a stop to limit the ilexion of the diaphragm 10 due to excessive pressure in the valve chamber. This will permit the diaphragm to move sufiiciently to. open the seams valve, but will prevent any strain and conphragm due to excessive ressure.

The valve t is normally eld in position to close the passage 5 by a spring 13, which sequent breaker permanent set of the diarests at one end against the cap 9 and at the other end against a button 14. The tension of this spring may be adjusted by means of a stud 15, which is threaded into the further end of the casing 11 and abuts against the button 14. The extreme end of the stud 13 is protected by a cap 16, which is screwed upon the extreme end of the casing 11. The outlet port 7 is partially closed by a plug 17, which, however, is provided with a small perforation leading from the outlet chamber 6 to the atmosphere. The inlet port 3 connects with a pipe 18, which leads to the interior of the expansion'tank. The pipe F also connects with another outlet port leading from the outlet chamber 6.

The operation of the device is as follows: Assuming that the circulating medium or steam generated therefrom within the circulating system has reached the pressure at which the safety valve is set to operate, the pressure within the valve-chamber 2, which is in free communication with the interior. of

the tank D, will operate against the diaphragm 10, thereby obtaining a much larger surface against which to exert its expansive come the tension of the spring 13, but also to overcome any adhesion between the valve and its seat caused by long disuse and corrosion of the valve. As soon as the valve 4 is drawn from its seat, a free outlet will be afforded for the circulating medium within the circulating system to pass through the valve-chamber 2, the passage 5, the outlet chamber 6, the pipe F. to the three way cock G. The three-way cock will ordinarily be so set that the pipe F will connect with the pipe I, so that the steam and water thus blown out through the safety-valve will continue from the pipe F through'the three-way cock G into the pipe I, whence it will be discharged directly against the fire in the fire-b0}: of the heater B. I thus obtain a double effect. First, I allow a free outlet, whereby the pressure will be promptly reduced, and at thesame time I utilize the escaping moisture to reduce the fire which has brought about the excessive pressure, and thus in a short time I reduce the pressure in two ways,whereupon the valve will close and the fire will be no longer affected by the water. but will burn in its lowered condition. If, for any reason, it is preferred not to discharge the steam and water int 0 the fire, the three-way cock G may. be so set as to direct the escaping steam and water to the atmosphere through the pipe J It will sometimes happen, however, that there 'may be a slight leakage between the valve 4 and its seat, which leakage if undetected anddisregarded would ultimately result in the evaporationand dischargeof all of-the. water in the circulating system, with consequent annoyance, delay and damage. I, therefore, have provided the plug 17, having a small passage leading to the atmosphere. If, now, there be a slight leakage, the water so leaking will not pass through the valve 4 with any force, but, trickling through, will find its way by gravity through the perforation in the plug 17 and will be discharged upon the top of the tank D, from which it will gradually trickle and evaporate. Inasmuch, as it is the common practice to .use strong brine as the circulating medium in these systems, such escaping brine will soon leave a conspicuous White deposit along the top and sides of the tank D, which deposit will call attention to the fact that brine is escaping through the valve 4.

The operation of the pipe H leading from the valve. E of the pipe F will be readily understood, the effect being to give a vent to each of thecirculating systems which are common in a car, and to utilize their joint discharge in reducing the fire. if desired.

While I have shown my invention embodied in what may be consideredits preferred form, it will be understood that such. form simply serves as a typical illustration of a convenient manner in which my invention may be utilized, but I do not by any means limit myself to the precise mechanism shown or to the precise relation of the parts shown and described.

I claim:

1. In acar heating system, the combination with a closed circulating system, of a safety valve connected therewith, a ip leading from the blow-ofi' of the safetyvalve to a remote point, said safety valve being also provided with a separate small opening arranged to conduct leakage from the valve to an adjacent indicating point outside of the valve.

2. In a car heating system, the combination with a closed system of circulating i es of a fire-box heater in o erative contact therewith, a safety-valve connected with said circulating pipes, a conduit leading from the blow-off of said safety valve to the fire-box of said heater, said valve being also provided With a short and constricted opening for conducting leakage from said valve to an ad acent indicating point.

EGBERT H. GOLD. Witnesses:

M. E. SHIELDs, G. Y. DONKWARD.

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