US488488A

US488488A - Fourths to franklin c

Info

Publication number: US488488A
Authority: US
Publication date: 1892-12-20
Anticipated expiration: 1909-12-20

Description

Patented Dee. 20, 1892.

F. DfTOUGEY. BALANGED SLIDE VALVE.

(No Model.)

TATES PATENT muon.

FERRIS D. TOUOEY, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR OF THREE- FOURTHS TO FRANKLIN O. JOHNSON, OF SAME PLACE.

BALANCED SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 488,488, dated December 20, 1892.

Application filed November 17, 1891. Serial No. 412,223.` (No model.}

To all whom it may concern,.-

Be it known that I, Fnnnts D. ToUcnY, of Minneapolis, in the county of Hennepin and State of Minnesota, have invented a certain Improved Balanced Slide-Valve for Steam- Engines, of which the following is a specification.

My invention relates to balanced .slide valves and the object of the same is to do away with the use of springs therein, relying entirely upon properly directed steam pressure to hold the valve upon its two seats and in addition to provide a more simple and durable and cheap construction.

To this end my invention consists in the combination with a longitudinally divided two part valve contained in a steam chest provided with the usual valve seat having the admission and exhaust ports, of a secondary valve seat iixedly arranged parallel with the first and which the top of the valve is adapted to engage, said secondary seat provided with an atmospheric port or ports whereby the steam is prevented from collecting above the valve, and the upper half ofthe valve steadily held in contact with the upper plate by the pressure beneath it; and in the particular constructions and combinations hereinafter de` scribed and pointed out in the claims.

My invention will be more readily linderstood by reference to the acompanying drawings, in whichz- Figure lis a longitudinal elevation of a balanced slide valve embodying my invention. Fig. 2 is a transverse section of the same, two sections being shown as upon the lines y-y and X-of Fig. l. Fig. 3 is a horizontal section on the line a-z of Fig. 2. Fig. 4 is a sectional view on the line o--v of Fig. 3. Fig. 5 is an enlarged detail of the packing bars or plates.

As shown in the drawings, 2 represents the engine cylinder, 3, 3, the admission ports thereof, 4, the exhaust port and 5, the smoothly planed and surfaced valve table or seat through which said ports are cut. The steam chest 6 having the top or face plate 7 is of the ordinary style and the piston or valve rod 8 enters the same through the packing or stuffing box 9. The valve rod is provided with the yoke l0 embracing the lower part ll of the slide valve. The upper and lower parts of this slide valve have the interior opening or cavity l2 through which the exhaust steam passes from either one of the ports 3 into the exhaust port 4. The valve is shown near one of its extreme positions so that the right hand admission port is open. The lower part of this valve is recessed and adapted to receive the upper or male part 13 of the valve adapted toY telescope into the same, the lower end of the saine arranged to normally stand some distance above the upper surface of the inner flange ll of the lower part as shown. The joints between these two parts are made steam tight by means of the metallic packing plates or bars 14E arranged in the grooves l5 provided in the upper edges of the lower half of the valve. The surface channels 50 are provided in the outer walls of the male part on each side of the bearing engaged by the packing bars or blades l5 to insure an equal Wear on all packing bearings.

As shown in the first two figures the top of the male part of the Valve has the extended edges 16 projecting into line with and overhauging the outline of the female part of the valve. A space 17 equal to the space 1B under the male part is left between the edges 16 and the upper edges of lower part so that when the steam pressure is removedv the male part may collapse into the other and leave its seat 2l. The pressure of the steam under the edges 16 presses the top of the valve up against its seat on the secondary plate 22. This would not occur however unless all or a great portion of the pressure was removed from the top surface of the male part of the valve.

I do not claim to provide a perfectly balanced Valve but do remove the greater part of the usual pressure from the same thereby making it easier and less expensive to operate and to maintain in good order. This I do by means of ports or exhaust ducts 23 provided in the seat'2l and leading either to the open air or to a chamber in which the pressure is much less than that in the chest 6, whereby all steam leaking in above the upper valve immediately passes off through the ports thus keeping down the pressure on top of the valve to practically zero and only enough surface being provided on the under side of the IOO projecting edges 16 to safely keep the valve up against its upper seat very little friction loccurs at this point. And the pressure on the.

. when tilted up. In order thus to allow the parts freer action without springing` the valve rod or yoke thereof at such times I provide the convex surfaces 19 on the ends of the yoke and tit the plates 20, bearing against the ends of the valves, thereto. Now it will be seen that when one end of the lower part of the valve is tilted up by a compression of steam or air in the cylinder, the same will slip freely up between the plates 20, which being thrown into an angle with the yoke will readily adjust themselves on the convex surfaces thereof and as the steam pressure is released they Will return to theirnormal positions as the valve drops back onto its seat. In case any part of the valve should break or the packing blades get loose the blades would be prevented from slipping off the lower part by the yoke which is arranged high enough to intercept the same.

The upper part of the top of the valve bears against the lower surface 2l of this plate 22 formed on the chest head 7. The length of this plate is just equal to that of the valve seat or table 5 so that the wear thereon is perfectly even and said part kept exactly parallel as it will be seen that the ends will be worn down level by the valve jutting past them at each stroke. If this plate alone were provided the upper part of the valve would have to be held up against the same by springs arranged in the lower part as the steam passingin between the top of the valve and said plate would equalize the pressure thereon whereupon if not supported by springs the upper part would fall. To prevent this equalization of the pressure I provide the ports 23 in line with the inlet channel 24 arranged in the head 7 and extending transversely through the same with respect to the movement of the valve. Ordinarily a very small air pressure is required in the ports 23 and I therefore provide the valve 25 in connection therewith whereby the same may be entirely cut off or the valve being partly open a slight air and steam pressure maintained in the ports and channel 24: by temporarily holding therein the steam escaping into the same. The sleeves 26 are provided in each port so that when the upper part of the valve drops down at the time steam is cut off the ports will be practically closed and a waste of steam avoided when the steam is again turned on and also the raising of the upper part of the valve insured. I provide the openings or ducts 27 above the plate 22 through which the steam may pass freely into the ends of the steam chest thereby maintaining an equal pressure of steam on both ends of the valve and at both admission ports. To prevent the falling out of the packing blades or plates 14 owing to the breaking of the lower part of the valve I provide the same with the grooves 28 in which I lay the long Wire staples 29 having the short ends 30 to drop into holes 3l provided in the blades. The blades are arranged so that one end 32 of each blade butts against the side of another, through the side of which I make asmall slot to receive the staple which therefore locks the ends together and one staple being arranged at each corner the blades are all retained in position while at the same time free to press tightly in against the depending part 13.

Where springs are used for holding the upper part ofthe valve against the second seat as is usual in the ordinary locomotive slide valve it will be seen that the springs will press with greater force when there is no steam in the chest than they will during pressure thereby causing a continual wear which in my valve is entirely dispensed with owing to the fact that on the instant pressure is cutoff from the chest the top of the Valve drops down and the Valve ceases to strongly engage either of its seats. Furthermore by doing away with springs all danger of the breaking down of the valve owing to the breakage or falling out of the springs is' obviated. From the same fact it followsthat there can be no waste of steam blowing th rough the exhaust which often occurs where spring extended valves are employed.

Having thus described my invention I claim as new and desire to secure by Letters Patent- 1. The combination in a device of the class described, of a valve, a chest wherein the same is contained and two valve seats, one containing the usual steam port or ports and the other provided with pressure relief ports opening against the upper surface of said valve, substantially as described.

2. The combination of a two part valve, with asteam chest wherein the same is arranged, a lixed seat having a steam port or ports and another fixed seat and arranged opposite the iirst having pressure relief ports normally closed by the upper surface of the upper part of said valve, said valve adapted.

to operate between said seats, substantially as described.

3. The combination with a valve composed of telescoping parts, of a steam chest for the saine, a seat whereon one side of the valve rests and in which a steam port or ports is provided, a second seat fixed parallel with respect to the tirst seat and provided with pressure relief ports, opening against the top of the upper part and normally closed thereby, each part of said valve being provided with a surface whereon the steam pressure is ex- IOO erted to hold that part of the valve against its seat, substantially as described.

4. The combination with a valve composed of telescoping parts of a steam chest wherein the same is contained, a seat for the valve provided therein and containing asteam port or ports, a second seat arranged in connection with a head or face of the steam chest and parallel with the first seat, said valve provided on each part with a surface to receive steam pressure acting to hold that part on its seat, and said second seat provided with a pressure relief or atmospheric port or ports normally closed by the top surface of the valve which bears on said seat, anda duct arranged in the steam chest head and communieating with said port or ports and the outer air, substantially as described. Y

5. The combination with the steam chest and the cylinder, of the valve seat having ports leading into said cylinder, a second valve seat arranged on the inside of the chest head or plate, relief or air ports arranged therein and communicating with the open air and a valve adapted to operate between said seats and having an upper surface adapted to normally close said air port, said valve made up of two parts telescoping into one another, steam pressure surfaces arranged on the inner edges of each part, and whereon the steam pressure is exerted to hold each part to its seat, and packing blades provided on one part of the valve and engaging the other to make the joint between them steam tight, and means being provided for operating said valve, substantially as described.

6. The combination with the cylinder and the steam chest of the engine, of parallel seats arranged on opposite sides of the steam chest, ducts arranged in the steam chest head or cover above or outside of the seat arranged in connection therewith whereby an equal pressure of steam is attained in both ends of the chest, said seat provided with openings to the air, the other seat provided with steam ports, a valve arranged to slide between said seats and consisting of two parts telescoping into one another and having an internal exhaust cavity, metallic packingblades arranged between the parts of the valve, that part engaging the seat having the air openings being provided with extended edges whereby a steam surface is provided whereon pressure may be exerted to hold that part of the valve against its seat, said part of the valve adapted to always close said air openings while pressure exists and said parts of the valve adapted to telescope into one another when the pressure is relieved whereby the engagement with the seats is broken, as described. t

7. The combination with the steam ches of a seat therein having a steam port or ports, a second seat arranged parallel with the first and fixed on the cover of the chest and provided with the pressure relief ports, a valve composed of male and female parts and having an upper surface to normally close said relief ports, suitable packing blades arranged between the said parts, a duct arranged in the steam chest and communicating with the air openings or ports thereof and a valve arranged in connection with said duct for regulating the escape of air or steam therefrom said bars loosely engaging the valve,whereby said valve is adapted to move freely to or from the valve seat, substantially as described.

9. The combination with the valve arranged in two parts, male and female, with packing blades arranged in grooves provided in one of said parts and having faces to engage the other part, said blades arranged so that the end of one blade abuts against the side of the other in each case, said blades being grooved and staples 29 for holding said blades in the relation described whereby said blades are adapted to press evenly and freely upon the packing surfaces, as described.

lO. The combination in a device of the class described, of a two part valve, with metallic packing blades or plates arranged between the parts of the same, the valve seat or table, the steam chest, a plate of a length substantially equal to said seat and extending into said chest and parallel with said seat, the upper part of said valve provided with a surface to engage the plate, openings or ducts extending between the ends of the chest to equalize the pressure in the ends of the valve, and openings to the atmosphere through said plate, said openings normally closed by the top of the valve, substantially as described.

1l. The combination in a device of the class described, of the valve seat or table provided with the ports, with the steam chest provided with the plate 22 parallel with said seat and having openings or ports 23 and a channel leading to the atmosphere, a valve 25 in connection therewith, the two part valve having the upper part of an area equal to the lower part, a packing between said parts and openings through the upper part to admit steam to contact with said plates, and means for reciprocating the valve, substantially as described.

12. The combination in a device of the class described, of the valve seat having the ports, with the steam chest, the head thereof, the plate 22 formed thereon and parallel with said seat, ducts 27 provided to conduct steam equally to the ends of the chest, said plate and seat being of the same length the valve consisting of the lower part l1 and the upper part 13 telescoping therewith, the metallic packing blades let therefor, the extended edges 16 of said upper part, and openings IOO IIO

IZO

through the middle part, atmospheric ports in said plates and sleeves 26 arranged therein, substantially as described.

13. The combination with the steam-chest, of parallel seats arranged therein opposite one another, a valve to operate between said seats, steam-ports arranged in one of them,

'and a duct or ducts 27 arranged above the other in the head of the steam chest and eX- 1o tending therethrough and from which steam may pass from one end of the chest to the other to equalize the pressure upon the ends of the valve, substantially as described.

In testimony whereof I have hereunto set my hand this 23d day of October, 1891.

FERRIS D. TOUCEY.

In presence of- O. G. HAWLEY, F. S. LYON.