US568980A - Triple valve - Google Patents

Description

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H. L. HOWE,

' TRIPLE VALVE. No. 568,980. Patented Oct. 1896.

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- H. L. HOWE.

TRIPLE VALVE.

No. 568,980. Patented Oct. 6, 1896.

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H. L. HOWE. Y I TRIPLE VALVE- (No Model.)

NOI 568,980.

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WIT NESSES:

ATTORNEYS UNITED STATES PATENT OFFICE.

HENRY L. HOlVE, OF CANANDAIGUA, NEV YORK, ASSIGNOR TO THE STANDARD BRAKE COMPANY, OF NEW YORK, N. Y.

TRlPLE VALVE.

SPECIFICATION forming part of Letters Patent No. 568,980, dated October 6, 1896.

Original application filed May 8, 1893, Serial N0. 472,872. Divided and this application filed July 6, 1894. Renewed August 20, 1896. Serial No. 603,425. (No model.)

To all whom, it may concern.-

Be it known that I, HENRY L. HOWE, a citizen of the United States of America, residing at Canandaigua, Ontario county, State of New York, have invented certain new and useful Improvements in Triple Valves, of which the following is a specification.

This invention relates generally to fluidpressure brake apparatus, and more particularly to the so-called triple valve for such apparatus, and is a division of an application filed byme in the United States Patent Oifice May 3, 1893, Serial No. 472,8"2.

The present improvements have for their object to utilize a larger percentage of the actual pressure in the apparatus in applying the brakes than has heretofore been practically possible; and to this end they consist, primarily, in means by which upon the application of the brakes the lesser and greater pressures in the apparatus may be applied successively, or, in other words, by which the train-pipe and auxiliary-reservoir pressures may be separately admitted into the brakecylinder, the lesser pressure of the train-pipe (due to its reduction in pressure to efiect the movement of the valve) to expand into the brake-cylinder, which upon equalizing in the train-pipe and cylinder may be augmented by the greater pressure of the auxiliary reservoir for, for instance, an emergency stop.

The invention contemplates the use of both the train-pipe and auxiliary-reservoir pressures for the application of the brakes, and also contemplates as a subordinate feature the use of the auxiliary-reservoir pressure for a service application.

From the foregoing it will be understood that upon a reduction of train-pipe pressure to effect the application of the brakes the train-pipe pressure is caused to expand into the brake-cylinder, whereupon the auxiliaryreservoir pressure is allowed to enter the brake-cylinder to raise the pressure therein to the fullest extent. Thus, assuming that the pressure in the train-pipe and auxiliary reservoir is seventy pounds and that upon a reduction of twenty pounds pressure in the train-pipe to effect the application of the brakes communication between-the auxiliary reservoir and train-pipe will be cut 06, holding the seventy pounds pressure in the auxiliary reservoir, and communication between the train-pipe and brake-cylinder is established, the train-pipe pressure will then expand into the brake-cylinder until such presssu're is, say, at forty pounds. The auxiliary-reservoir pressure of seventy pounds will then be caused to expand into the brakecylinder, so that the brake-cylinder pressure will be increased to the greatest extent, say sixty-two pounds. The lesser pressure, therefore, of the train-pipe has been caused to expand into the brake-cylinder, which may be thereafter immediately augmented by the greater pressure from the auxiliary reservoir.

The particular means for carrying out this invention consists, briefly stated, of two valves, one valve controlling the admission of train-pipe pressure to the brake-cylinder and the other valve controlling the admission of auxiliary-reservoir pressure to the brakecylinder, as is more fully hereinafter set forth and represented in the accompanying drawings, in which- Figure l is a sectional elevation of the improved valve, its casing and connected trainpipe, auxiliary reservoir, brake-cylinder, and exhaust. Fig. l is a detail of the secondary valve without the spring. Fig. 2 is a similar sect-ion showing the valve in one of its moved positions for efi'ecting the service stop. Fig. 3 is a similar section of the valve in another position at the commencement of the emergency stop and before the secondary valve moves. Fig. aisasimilar section of the valve in emergency-stop position, the secondary valve having moved to open communication between the auxiliary reservoir and the brakecylinder. Fig. 5 is a cross-section of the valve and easing on the line 5 5 of Fig. 1. Fig. 6 is a modified form of the invention.

Referring now to the construction shown in Figs. 1, 2, and 3, embodying the preferred form of the invention, the casing 1 of the valve is provided with a valve-chamber 2, communicating at one end with a cylinder 6,

that is closed by a cap 19, and at its other end communicates with the auxiliary reservoir. The valve-chamber 2 also communicates with a passage 5, leading to the trainpipe, and also with a passage 3, leading to too the brake-cylinder. The valve-chamber also communicates by a passage 3 with the brakecylinder and with an exhaust-port 7. The valve-chamber contains a valve 8, arranged to control the admission of pressure from the train-pipe to the brake-cylinder through one or more openings, and also the exhaust of pressure from the brake-cylinder to the atmosphere. The valve is connected by a stem 16 to a piston 15, arranged in the piston-cylinder 6, the complete movement of which piston and valve being opposed in one direction by a suitable spring 17, preferably supported and carried by the cap 19 in any suitable manner. The inner end of this spring 17 when the valve and piston are in the exhaust or running position stops short of meeting the piston and allows, as will be hereinafter explained, a slight movement of the valve before the spring may be compressed. The train-pipe passage 5 is provided with seats 13 and 13 fora double check-valve 13, mounted in said passage and arranged to hold the pressure in the brake-cylinder from escaping back to the train-pipe should there be a further reduction of train-pipe pressure while the communication between the train-pipe and brake-cylinder is open, and also to confine the train-pipe pressure to one side of the piston 15 when the pressure is raised to return the valve to running or exhaust position.

The particular form of valve taken for illustration in the present embodiment of the invention is a recessed valve provided with a forward flange 8 and with an intermediate bridge across the recess providing an exhaustport 9 for coincidence with the passage 7, a port 8 for communication with the train-pipe passage 5, and also providing an opening 8 for coincidence with the brake-cylinder passage 3.

The forwardfiange 8 of the valve may be provided with a port 8, adapted to coincide with the train-pipe passage 5 to establish communication between the train-pipe and auxiliary reservoir. This latter port S may be omitted and a charging-slot be introduced in the piston-cylinder 6 for a similar purpose, as indicated by dotted lines in Fig. 1, and the flange 8 then simply serve to close the trainpipe passage from the valve-chamber 2. The valve side of the piston 15 is exposed to the auxiliary-reservoir pressure in the valvechamber 2, and on the opposite side of the piston the piston-cylinder 6 is in communication by a passage 1+1 with the train-pipe passage 5 below the check-valve 13. hen the parts are in the position shown in Fig. 1, the brake-cylinder is open to the exhaust-passage through the recess of the valve 8 and the port 9, and the train-pipe isin communication with the auxiliary reservoir either through the port 8 of the valve-flange 'or through the passage 14, piston-cylinder 6, and charging-slot, (if the latter be used,) and thence by the valve-chamber 2 around the.

exterior or outer side of the valve, and in this position the auxiliary reservoir may be charged with the desired pressure from the train-pipe.

Although the invention in the main contemplates the use of an emergency stop only, the construction is such that a service stop may be effected if desired. Provision for such stop may be made in various ways. Thus, as shown in Fig. 1, the valve 8 is provided with a rear flange 8, having a service-port 8 therethrough for coincidence with a passage 3", leading to the brake-cylinder. It is to be noticed that when the port 8 and passage 3 are in coincidence,as in Fig. 2, the train-pipe passage 5 is still cut E from the brake-cylinder and from the recess of the valve 8, and also that the exhaust-passage 7 is shut 0E.

The valve-casing 1 contains a secondary valve 30, consisting of a piston 31 and astem forming the valve properthat controls the passage 3, leading from the valve-chamber 2 or auxiliary reservoir to the brake-cylinder passage 3. The piston of this valve is exposed on one side to the train-pipe pressure,

ondary valve,being very much smaller in area than its piston 31, may be exposed when closing the passage 3 to the auxiliary-reservoir pressure, as in Fig. 1, or in lieu thereof a gentle spring 32, as in Fig. 1, may bear against one side of the piston. tending to move it to open the passage 3. The arrangement of this secondary valve 30 is such that afler the pressure from the train-pipe has been admitted tothe brake-cylinder and the pres: sures in said pipe and cylinder are equal or substantially equal, and hence balanced on both sides of the piston 31, the spring 32 or the auxiliary-reservoir pressure, acting on the end of the stem, will overbalance the pressure upon the piston 31 and cause it and the stem to move to open the passage 3 to the brakecylinder and immediately admit the auxiliary-reservoir pressure through said passage to said cylinder to augment that previously admitted from the train-pipe, and thus apply the brakes with the greatest force the pressures in the apparatus are capable of imparting. There is also provided a movable abutment formed by a collar 18 to meet the upper end of the double check-valve l3'to prevent its seating against its upper seat 13 and allow the train pipe pressure to pass around the check-valve into the brake-cylinder. This abutment is carried by a stem 18 of a piston 18 working in an open-ended cylinder 13 in the valve-casing 1 between and communicating with the piston-cylinder 6 on the auxiliary-reservoir side of the piston 15 and the train-pipe passage 5. A spring 18, surrounding the stem 18, may be used to aid the return of the abutment and piston to normal position, to allow the check-valve 13 to seat against its upper seat should the trainpipe pressure so move it.

Instead of the double check-valve described a single check-valve may be used, seating only against the lower seat 13, as will hereinafter appear.

If a service stop be desired and-the construction before described be employed, the engineer by the operation of his valve will effect a slight reduction in the train -pipe pressure. This will cause the check-valve 13 to seat on its lower seat and correspondingly reduce the pressure from the piston-cylinder 6 through the passage 14: from one side of the piston 15, so that the excessive or overbalancing auxiliary-reservoir pressure, acting upon the opposite side of the piston, will effeet the movement of the piston and valve from the position shown in Fig. 1 to the position shown in Fig. 2, slightly compressing the spring 17, cutting the brake-cylinder passage 3 off from the exhaust-passage 7 and bringing the service-port S in coincidence with the passage 3*, whereupon the pressure in the auxiliary reservoir will pass into the brakecylinder through said port 8 and passage 3*, applying the brakes. In this expansion of the auxiliary-reservoir pressure to the brakecylinder the pressure on that side of the piston 15 will be so far reduced as to permit the spring 17 acting on the other side of said piston to move it and the valve 8 back to take the service'port 8 from coincidence with the passage 3, cutting off further admission to the brake-cylinder and holding that already admitted therein. If the pressure in the trainpipe now be raised slightly, it will raise the check-valve 13 to its upper seat and permit such rise in pressure to pass by passage 14 to exert its force against the piston 15, which, aided by the spring 17, will move the valve 8 back to running position, as in Fig. 1. In the movement of the valve .8 to the servicestop position the train-pipe passage to the brake-cylinder is still cut off by said valve, and as the train-pipe pressure acting on one side of the piston 31 cannot be reduced in effecting the service stop sufficient to allow the pressure on the other side of the piston to establish an equilibrium no movement of the secondary valve 30 will take place.

If it be desired to effect an emergency stop, the principal object for which this valve is designed, the train-pipe pressure will be reduced, so that the piston 15 and valve 8 will move to the position shown in Fig. 3, compressing the spring 17 to its greatest extent, due to the preponderance of pressure of the auxiliary reservoir upon the opposite side of the piston, cutting ofi the exhaust from the brake-cylinder and bringing the port 8 into coincidence with the train-pipe passage 5 for the passage of the trainpipe pressure through the recess of the valve and opening 8 of the valve 8 into the brake-cylinder. This expansion of the train-pipe pressure into the brakecylinder will cause an equalization of pres- 32, if used, will move the secondary valve to open the passage 3 and then admit the auxiliary-reservoir pressure into the brake-cylinder to augment that already admitted therein from the train-pipe, thus applying the brakes with the greatest force the pressures in the apparatus are capable of imparting.

\Vhen the movable abutment 18 and double check-valve 13 are used, the reduction in train-pipe pressure to effect the movement of the valve 8 to this emergency-stop position will permit the auxiliary-reservoir pressure, acting on one side of the piston 18 to immediately move said piston and the abutment 18*, so that the abutment will be in position to obstruct the seating of the double checkvalve against its upper seat 13 and hence allow the unobstructed flow of the train-pipe pressure to the brake-cylinder. When the pressure in the brake-cylinder is augmented bythat from the auxiliary reservoir, or as soon as the pressure is about equal on both sides of the check-valve, the check-valve 13 will seat by gravity on its lower seat 13 to confine such pressure in the brake-cylinder. As soon as the auxiliary-reservoir and brakecylinder pressures are equal the piston, with the movable abutment 18, moves back under the force of the spring 18 to the normal position, so as not to obstruct the seating of the double check-valve against its upper seat 13 when the train-pipe pressure is raised suflicient to so move said check-valve. The brakes may now be released by raising the train-pipe pressure, so that such pressure will pass through the passage 14 and act upon one side of the piston 15, which, aided by the force of the spring 17 and before such rise in pressure equals that on the auxiliary-reservoir side of said piston, will immediately move the piston 15 and its valve 8, returning the parts to the position shown in Fig. 1, opening the brake-cylinder by opening 8 and recess of the valve to the exhaust by the coincidence of port 9 and passage 7. In raising the train-pipe pressure for this purpose the check-valve 1 3 is not lifted from its lower seat, because the auxiliary-reservoir and brakecylinder pressures at that time are equal and exceed on the upper side of the check-valve the required train pipe pressure below it. IVhen the valve 8 reaches the normal running position, the auxiliary reservoir may be recharged through the port 8 or the charging-slot in the piston-cylinder 6. When the port 8 is used for recharging, the train-pipe pressure is raised sufliciently slow not toseat the double-check valve 13 against its upper seat 13".

At the time the brake-cylinder pressure exhausts to the atmosphere and the recharging of the auxiliary reservoir takes place the train-pipe pressure, actingon one side of the piston 31, will return the secondary valve 30 to close the passage 3. It will be noticed that the valve 8 is so constructed that the passage 3 is closed, as by its :liange S 011 the movement to exhaust position in advance of the opening of the exhaust-passage '7, and hence the remaining pressure in the auxiliary reservoir will be confined therein. ering of the passage 3 is not essential,because as soon as the valve 8 moves so that the flange 8 has covered the train-pipe passage 5 the train-pipe pressure will act upon the piston 31. to move the secondary valve 30 to close said passa e 3. 7

From the foregoing description it will be seen that in expanding the lesserpressure of the Working reservoir, 2'. e.,thetrain-pipe, into another reservoir, as the brake-cylinder, such expansion effects through the secondary valve 30, or other equivalent device, the expansion of a greater pressure of another reservoir, such as the auxiliaryreservoir, into said cyl inder,and that this automatic expansion of the auxiliary-reservoir pressure into the brakecylinder is effected bythe equalization of the pressures on both sides of the piston 31 of said secondary valve. It will also be seen that, While in the old methods of applying the brakes on emergency stop the greater pres sure of the auxiliary reservoir was admitted to the brake-cylinder slightly ahead of and also during the subsequent admission of the lesser pressure from the train-pipe, so that the greater pressure tended to retard the lesser, the present method of operation not only effectually separates the admission of the two pressures, but admits the lesser pressure of the train pipe in advance of the greater pressure from the auxiliary reservoir. In addition to overcoming the retardation of the admission of the lesser pressure, the present method of operation, by admitting the lesser pressure followed by the greater one, permits the lesser pressure to expand to complete equalization in the brake-cylinder and train-pipe before the greater is admitted, and thus renders it possible to obtain a higher pressure in the brake-cylinder than is otherwise possible, and it also provides a much larger opening for the passage of the greater pressure, thereby making the operation more rapid.

When the structure employs the serviceport 8 and passage 3 to adapt the apparatus for a service stop, the motion of the valve 8 for the emergency application will be so rapid in the port 8", passing over the passage 3 ,that practically no expansion of the auxiliary res ervoir into the brake-cylinder Will take place at that time. IVhen, however, the structure lacks the service-stop function, and hence omits the port S and passage 3", no danger of this expansion will be present.

In the modified form shown in Fig. 6 the invention is applied to a Well-known form of triple valve with a like function and operation. The secondary valve 30 controls the This covadmission of auxiliary-reservoir pressure through the passage 3, chamber 33, and passage 3 into the passage 3, leading to the brake-cylinder. The piston 31 of said secondary valve is open on one side to the trainpipe passage 5 through the passage 3, and on its opposite side to the brake-cylinder passage through the passage 3. The valve 30 in this instance is a simple hub of small area seating against the end of the passage 3 and is thus exposed to the auxiliary-reservoir pressure from the triple-valve chamber. The construction and operation of the triple valve of this modification remain the same, With the exception that the second auxiliary-reservoir admission-port of said valve is omitted or closed by a plug 35. In the position of the ports shown in the figure the triple valve has moved to emergency position, and just before the emergency-piston is moved to admit the trainpressure to the brake-cylinder. After this has been effected and the pressures on both sides of the piston 31 of the secondary valve are equal, said secondary valve moves to open the anxiliary-reservoir passage 3 to admit the pressure therefrom to the brake-cylinder, as has been fully hereinbefore described.

No claim is herein made to the method of obtaining the maximum pressure in the brakecylinder from two sources of fiuid supply, nor, broadly, to means for efiecting this result, as the same is set forth and claimed in my said application, Serial No. 472,872.

hat is claimed is 1. In a brake apparatus, a valve controlling a port for the admission of the trainpipe pressure to the auxiliary reservoir and to the brake-cylinder, of a second valve controlling a port for the admission of the auxiliaryreservoir pressure to the brake-cylinder and maintaining said port closed until the pressures in the train-pipe and brake-cylinder are substantially equalized, as set forth.

2. In a brake apparatus, a valve controlling ports for the communication of the train-pipe with the brake-cylinder and of the brake-cylinder with the exhaust, and a second valve upon the admission of the train-pipe pres sure to the brake-cylinder then admitting the auxiliary-reservoir pressure to the brake-cylinder through a suitable port, substantially as described. 3. In a brake apparatus, a valve controlling ports for the admission of the train-pipe pressure to the auxiliary reservoir and to the brake-cylinder and from the brake-cylinder to the exhaust, and a second valve movable after the first-mentioned valve to control a. port for the admission of the auxiliary-reservoir pressure to the brake-cylinder, substantially as described.

4. In a brake apparatus, a valve controlling a port for the admission of the train-pipe pressure to the brake-cylinder, another valve movable after the first-mentioned valve to control a port for the admission of the auxiliary-reservoir pressure to the brake-cylinder,

a check-valve in the train-pipe passage and a movable stop to prevent the seating of said check-valve, substantially as described.

5. In a brake apparatus, a valve controlling ports for the admission of the train-pipe pressure to the auxiliary reservoir and to the brake-cylinder, and a second valve by such admission to the brake-cylinder thereupon admitting the auxiliary-reservoir pressure to the brake-cylinder through a suitable port, a check-valve in the train-pipe passage and a movable stop to prevent the seating of said check-valve, substantially as described.

6. In a brake apparatus, a valve controlling a port for the admission of train-pipe pressure to the brake-cylinder, another valve or piston and its port, exposed to both trainpipe and brake-cylind er pressure, controlling by the difference in these pressures the admission of auxiliary-reservoir pressure to the brake-cylinder and the closing of communication between brake-cylinder and auxiliary reservoir, a check-valve in the train-pipe passage and a movable stop to prevent the seating of check-valve, substantially as described.

7. In a brake apparatus, a valve controlling a port for the admission of the train-pipe pressure to the brake-cylinder, and another valve controlling a port for the admission ofanother valve independently movable of the first-named valve controlling communication between the auxiliary reservoir and brakecylinder and said valve normally holding such communication closed until after the firstnamed valve has moved to admit pressure from the train-pipe into the brake-cylinder, substantially as described.

9. The combination with the train-pipe, auxiliary reservoir and brake-cylinder, of a Valve opening the train-pipe to the brakecylinder and maintaining such opening until the pressures therein are substantially equalized, and another valve operative upon such equalization to automatically admit the auxiliary-reservoir pressure to the brake-cylinder, as set forth.

In witness whereof I have hereunto signed my name in the presence of two Witnesses.

HENRY L. HOWE.

Witnesses:

GEO. H. GRAHAM, E. L. Tom).

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