US405250A - Check-valve - Google Patents

Description

(No Model.)

'0. B.'DUDLEY 8v J. D. BOWMAN.

CHECK VALVE.

' Ju B mm i ahesr l i A 2 nven'ors:

' UNITED STATES l'PATENT OFFICE...

CHARLES B. DUDLEY AND JOHN D. BOWMAN, OF ALTOONA, PENNSYLVANIA.

CHECK-VALVE.

SPECIFICATION forming part of Letters Patent No. 405,250, dated June 18, 1889. Application filed November 13, 1888. Serial No. 290,689. (No model.)

.To @ZZ whom it may concern/.-

Be it known that we, CHARLES B. DUDLEY and JOHN D. BOWMAN, both of Altoona, county of Blair, State of Pennsylvania, have invented a new and useful Improved Check- Valve, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part of this specification.

Our invention relates to the construction of a check-valve primarily designed for use in connection with the air-brake system of a railway-train; and we have especially designed it for use in the connecting-pipe leading from the air-brake system proper to a carbureting system, through which the compressed air, after being impregnated with hydrocarbon vapor, is led to the burners within the car and utilized for lighting it.

The object of our invention is to obtain a check-valve which shall be both sensitive in the sense that it will act promptly in cutting off a reflux action of the air or gasand at the same time be so firmly seated as to greatly diminish the chances of gas escaping backward through the seated valve.

A further object which we have in view is to combine with the check-valve a dnstguard, which will prevent any dust from the air-brake systemfrom passing between the check-valve-a point of great importance where the air is used in carbureting system.

Reference being now had to the drawings which illustrate a valve, constructed in accordance with our invention and in what we believe to be the best method devised by us for this application, Figure 1 is a central sectional elevation of such a valve; and Fig. 2, a plan view thereof, partly in section, on the line a: of Fig. l.

A A are respectively the entrance and exit pipes through which the air or gas passes to and from our improved check-valve.

B is a casting constituting the main part of the valve-chamber; C, a casting adapted to be secured by bolts L L, 85o., to the under side of casting B, and constituting a part of the valve-chamber. The third casting J is provided to complete the valve-chamber, this casting J being essentially a cap made removable to permit of the insertion and withdrawal of the check-valve itself.

B', B0, and B9 are chambers formed in the casting B.

B2 is a passage leading from the chamber B to a passage C,which, through a continuation 02, leads to the chamber C2, formed in the casting C.

B4 and B3 B3 are respectively an annular flange and cross flanges or webs formed on the bottom of casting B, as shown, so as to come above the chamber' C2 when the castings C and B are secured together.

B10 is a passage connecting with the open spaces lying between webs B2 and with the chamber O2, through the perforated plate G and felt washer F. At its upper end this passage B10 leads into chamber B0. A

B5 is an annular flange or project-ion surrounding the passage B10, and extending up into chamber B6 above the bottom thereof, marked B11, which serves, when protected by a leather washer, as the seat for the checkvalve.

B7 is an annular groove formed in the bottom of chamber B0 below and loutside ofthe portion B11, on which the valveis seated.

C is a passage formed in casting C adapted to register, as shown, with the passage B2 of casting B; C2, a passage leading from passage C to the main chamber C2, formed in casting C.'

C4 is a -central stud or support projecting upward through the chamber C3 to the same level as that of the annular groove, marked C5 in the drawings.

D is a threaded pipe adapted to be screwed into the passage B2 and to project into the passage C', as shown, when the castings B and C are secured together. It serves the purpose of insuring the correct alignment lof the two passages, and is besides a convenient de vice for regulating the size of the passage.

E is a washer inserted between the'castings B and C to aid in making a tight v joint between them.

F is a washer or a disk, of felt or some other material permeable to air, but which will prel vent the passage of dust. ,l Y,

G is a metal plate of similar size to the washer F and perforated with numerous holes, as shown.

II is a washer, of leather or some similar material, which rests on the seat B11 and extends over the annular groove B7.

I is the check-valve, formed, as shown, so as to extend over the annular projection B5 and seat itself on the leather washer II over the valve-seat B11 at the bottom of chamber BG.

t' indicates annular serrations formed in the seat of valve I. I indicates the stem of valve I; J, a cap arranged to screw into the casting B and form a cover for the chamber Bf.

J is a projecting hollow boss formed in cap .I and serving as a guideto the spindle I of valve I, and also serving to seat and center the spring K, arranged to holdthe valve I to its seat.

J 2 is a passage connecting the top of the hollow boss J with the chamber B"'.

B8 is a passage leading from chamber B to chamber B.

The way in which the above-described device is put together is apparent from the drawings. In use the air (or it may be other gas) passes from the pipe A to the chamber B', thence through passages B2, C', and()2 to the chamber C3. From this chamber it passes through the felt disk F and the perforated metal disk G, which form a diaphragm between t-he chambers() and the continuation of this chamber formed by the rim and flanges B4 B3B3 of casting B. Having traversed this diaphragm and been freed from dust in so doing, the air enters the passage B10 and presses upward against the check-valve, raising it from its seat and escaping into the chamber B6, from whence it passes through passage Bs to chamber B9, and thence through pipe A to the point of use or storage. Whenever the pressure in chamber B9 exceeds that in chamber B', or approaches it within a predetermined amount regulated by the strength of the spring K, the valve I seats itself on the leather washer H and prevents reflux action.

It has been found very difiicult in valves of this kind to prevent the gas or air from escaping backward even when the valve is seated, and to overcome this difficulty we have devised the peculiar seat and formation of the valve already described. Before placing the Valve I in the chamber BG we pour into the bottom of chamber B a mixture of glycerine and water, or some similar liquid which will evaporate slowly or not at all, and then place the leather washer H in position. The quantity of glyecrine mixture or otherliquid should be sufficient to saturate the washer II and fill the annular groove B7, over the top of which the outer portions of the washer l-I extend. In this way we insure that the leather washer II shall always be soft and saturated with the mixture. By using in connection with this saturated washer a valve provided with the serrated bearing-face (such as is indicated at t) we insure the perfect closing of the passage governed by the valve even where the pressure holding the valve to its sel t is very light. Y

The particular formation a-nd arrangement of the passages leading to and from our improved check-valve are not material to our invention, these shown being designed for the conjoint use of the dust-guard and checkvalve, as shown in the drawings, and above described.

Having now described our invention, what we claim as new, and desire to secure by Letters Patent, is

l. In combination with an air or gas conduit, a check-valve chamber having its entrance-passage situated in its bottom and surrounded by an upwardly-extending annular projection, so as to form an annular chamber te contain liquid, a valve-seat formed on the bottom of said chamber around the upwardlyextending ange, a washer of leather or similar material resting on said seat, and a valve shaped to extend over the annular projection and seat itself on the washer aforesaid, all substantially as and for the purpose speciiied.

2. In combination with an air or gas conduit, a check-valve chamber havingits entrance-passage situated in its bottom and surrounded by an upwardly-extending annular projection, so as to form an annular chamber to contain liquid, a valve-seat formedenthe bottom of said chamber around the upwardlyextending flange, an annular groove extending around and below the valve-seat, a washer of leather or similar material restingon said seat and extending over the annular depressed groove, and a valve shaped to extend over the annular projection and seat itself on the washer aforesaid, all substantiallyas and for the purpose specified,

3. In combination with an air or gas conduit, a check-valve chamber having its en trance-passage;situated in its bottom and surrounded by an upwardly-extending annu lar projection, so as to form an annular cham ber to contain liquid, a Valve-seat formed on the bottom of said chamber around the upwardly-extending iiange, a washer of leather or similar material resting on said seat, and a valve shaped to extend over the annular projection and seat itself on the washer aforesaid, said valve having a bearing-face provided with scrrations, all substantially as and for the purpose specified.

et. In combination with an air or gas conduit, a check-valve chamber having its entrance-passage situated `in its bottom and surrounded by an upwardly-extendin g annular projection, so as to form an annular chamber to contain liquid, a valve-seat formed on the bottom of said chamber around the upwardlyextending flange, an annular groove extending around and below the valve-seat, a washer of leather or similar material resting on said seat and extending over the annular depressed grooves, and a valve shaped to extend over the annular projection and seat IOC ITO

itself on the washer aforesaid, said valve having a bearing-face provided with serrations, all substantially as and for the purpose specified.

5. In combination with an air or gas conduit, a dust-guard consisting of a disk or washer of felt and a similar disk of perforated metal arranged to support the felt secured across the conduit, and a check-valve situated in the conduit on the exit side of the dust-guard.

6. In 'combination with an air or gas conduit, a valve-chamber casting B, containing chambers B', B6, and B6 and having below chamber B6 an annular flange B4 and webs B6, a casting C, containing a chamber C6, and having an annular groove C5 and a central support C4, passages connecting chamber C6 with chambers B and B6 and chamber B6 with B6, a felt washer G and perforated metal supporting-plate F, clamped between the flange and webs B4 B3 B3 and the groove and support C5 C4, a check-valve situated in chamber B6, and a cap J, forming a cover to said chamber B6, all substantially as and for the purpose specified.

7. In combination with an air or gas conduit, a valve-chamber casting B, containing chambers B, B6, and B9 and having below chamber B6 an annular iiange B4 and webs B6, a casting C, containing a chamber C6 and having an annular groove C5 and a central support O4, passages connecting chamber C6 with chambers B and B6 and chamber B6 with B6, a felt washer G and perforated metal supporting-plate F, clamped between the flange and webs B4 B3 B3 and the groove and support C6 C4, an annular projection B5, extending around the entrance of the passage connecting chamber C6with chamber B6, so as to form a chamber at the bottom of chamber B6 to contain liquid, avalve-seat formed around ange B6, an annular depressed groove eX- tending around said valve-seat, a washer H, covering the valve-seat and extending over the depressed groove, a valve I, formed to eX- tend over the projection B6 and seat itself on Washer H, a valve-stem I extending up from said valve, a cap J, having a hollow internal projection J to supportv and guide the stem I', and a passage J 2, leading from chamber B6 to the top of the hollow projection, all substantially as and for the purpose speciiied.

CHARLES B. DUDLEY. JOHN D. BOWMAN. Witnesses:

J. L. RUssELL, J. CHESTER WILSON.

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