US1616289A - Single-seat throttle valve - Google Patents

Description

' 1 616,259 Feb. 1, 1927. S. TAYLOR SINGLE SEAT THROTTLE VALVE File? June 19, 1923 s Sheets-Sheeti- GU01 mu I 1,616,289 1927- s. w. TAYLOR SINGLE SEAT THROTTLE vALvE Filfad June 19 1923 3 Sheets-Sheet 2 h 1 ,9 M :3

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a a: a? v Q 7- s w. TAYLQR SINGLE SEAT THROTTLE VALVE 3 Sheets- Sheet Filed June 19, 1923 Patented Feb. 1, 1927.

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SAMUEL \V. TAYLO1-t, or BALTIMORE, MARYLAND; assrenon TO POO-LE ENGINEER- ING AND'MACHINE COMPANY, on woonsnrtrtv, BALTIMORE) MARYIQAND, A con- PORATION or MARYLAND.

SINGLE-SEAT THROTTLE VALVE.

Application filed June 19,

My invention relates to'single seat throttle valves, such as are intended fo'r'closing and opening communication between a source of fluid pressure and a receptacle, machine, ap-

paratus or point to Which-it is desired to ad'- mit the fluid pressure at will.

Among the objects ot my invention arez- To provide a single seat throttle valve combined with means for operating said valve, said means being constructed and arranged so that its operation may be controlled by a. device located at a distance from said valve.

To provide an unbalanced throttle valve and fluid operated means for operating said valve so constructed and combined with said valve that the fluid pressure which operates said operating means will be in one case, additive to the unbalanced pressure upon 29 said throttle valve in order to more-securely seat said throttle valve upon its valve port and, in the other case5 the fluid pressure upon said operating means Will be subtractive from the unbalanced pressure upon said throttle valve and being numerically greater than the unbalanced pressure upon said throttle valve will cause said throttle valve to move from the valve port.

To provide a throttle valve with fluid pressure operated means for moving said valve to and away fronrthe valve port, said means being so constructed and arranged that notwithstanding large forces are applied to the moving of said valve by said means, said valve contacts With the valve port without shock and is stopped in the open position also without shock.

To provide a single seat throttle valve coinbined with operating means therefor the movements of the latter beingcontrolledby suitable valves which, in turn, are moved by air operated means, the latter being con trolled by a hand or automatically operated valve.

To provide a single seat throttle valve and fluid operated means for operating said valve mounted upon the valve casing and connected to the valve by a valve stem passing through said casing, said operating means being secured to the valve casing in such a manner that the glands of stuffing boxes provided in the valve casing and in the operating means for preventing leakage was. SeriatNo. castes.

past the valve stem are'capable' of adjustment or repacking without the disarrangement of any of the parts.

To provide an operating means for a throttle valve having'a piston provided with packin' so arranged that said piston may be repacked by removing the head of the cylinder in which said piston Works and removing a portion only of said piston.

Toprovide a valvehaving steam' pressure normally upon one side thereof with a valve stem having a passage and a piston for op erating said valve connected to said valve stem and provided with a chamber communicating with said passage, said piston being arranged to work in a cylinder to the ends of which steam can be alternately admitted for operating said valve and from both sides of which steamis at times cutoff, in which case the steam upon'one side of the throttle valve will pass through said passage to said'chamber' and keep all the parts sufiiciently warm to insure operation even in the coldest weather.

These and further objects of my invention will become apparent in the following specification, reference being had to the accompanying drawings and the novel'means by which said objects are effected will be definitely pointed out in the claims.

In the drawings?- Figure 1 is a central section of a valve constructed according to my invention.

Fig.2 is a View of the valve shown in Fig. 1 looking in the direction of the arrow 2" in said figure.

Fig. 3 is a section along the line 33 in Fig. 2; y

Fig. 4 is an enlarged section along the line 4-4 in Fig. 2 looking in the direction of the arrows.

Fig. 5 is an enlarged section along the line 5 in Fig. 2 looking in. the direction of the arrows.

Fig; 6 is a section similar to that shown in Fig. 3 but showing a dilferent arrange ment of ducts. I

Fig. 7 is a diagrammatic illustration of the application of my improved valve to a locomotive booster.

In the drawings 10 is the valve casing which is provided with flanges 11 and 12 for attachment to pipes. The flange 11 is at the end through which steam enters the valve casing and the liange 12 at the end through which steam leaves the valve casing.

A septum is provided in the casing in which is formed the valve port 13 which the valve 14 is adapted to close. Steam pressure normally exists on the top of the valve 14.

The valve 14 is provided with a valve stem 15 which is tapered at its upper end and has secured thereto the discs 16 and 17 which together form a piston which reciprocates vertically in the cylinder 18. The discs 16 and 17 are secured on the valve stem 15 by a nut 19. Notches are turned in the abutting faces of the discs 16 and 17 and the nut serves to clamp the packing 20 within said notches so as to prevent leakage past the piston.

The discs 16 and 17 are recessed on their abutting faces so as to form an annular chamber 21 and said chamber communicates through the passage 22 in the stem 15 with the steam pressure on the top of the valve 14 in order to provide that the valve stem, piston and cylinder will be kept warm in cold weather when steam is not admitted to either side of said piston.

"Water of condensation that may accumulate on the top of the disc 16 can pass through the holes 22 22 to the chamber 21 and said water together with the water of condensation that may accumulate in the chamber 21 may drain by gravity through the passage 22.

In order to prevent steam passing through the holes 22*22 to the exhaust when the valve 14 is open as hereinafter described, the disc 16 is formed with a valve surface 16 which contacts with the valve surface 18 on the cylinder head 29.

The cylinder 18 is closed at its lower end by a head formed integrally therewith and said head is provided with a recess containing packing which is adjustable by the gland 24. A similar packed recess is provided in the flange 25 which is adjustable by the gland 26. The flange 25 closes the top of the valve casing 10. The glands 24 and 26 serve to adjust the respective packings so as to prevent leakage past the valve stem 15 and said glands are adjustable by the application of a tool introduced through openings, one of which is shown at 27, between the fcet 2828 formed integrally with the cylinder 18 which support the latter in spaced relation to the casing 10.

By removing the upper head 29 the nut 19 may be taken off and the disc 16 removed to introduce new packing 20.

For the purpose of operating the valve 14 the following instrumentalities are provided:

Thecylinder 18 has an offset 30 formed integrally therewith and in said offset there are formed bored holes which are b ushed by the valve bushings 31 and 32. Each of said bushings is provided with bored portions 33 and 34. In the bored portion in each bushing there is slidably mounted a piston valve 35 and in the portion 34 in each bushing there is mounted a ball valve 36. The ball valve 36 is adapted to contact with a valve seat formed at an end of the passage 37 which extends between the portions 33 and 34 in each valve bushing. Each of the portions 34 is closed by a plug 38 and each of the port-ions 33 is closed by a sleeve 39. The stem 40 of the valve 35 in the bushing 31 passes through one of the sleeves 39 and the valve stem 41 of the valve 35 in the bushing 32 passes through the other sleeve 39.

Each valve 35 is provided with a push rod 42 formed integrally therewith and said push rod is adapted to lift the ball valve 36 from its seat.

The passage 37 in the bushing 31 is connected by the duct 43 with the space in the cylinder 18 below the piston. The passage 37 in the bushing is connected by the duct 44 with the space in the cylinder 18 above the piston. The duct 45 in each of the bushings 31 and 32 is each connected to the duct 46 and the latter is connected to a source of steam pressure. each of the bushings 31 and 32 is each connected to the duct 48 and the latter is open to the atmosphere.

The valve stem 40 is directed upwardly and the valve stem 41 is directed downwardly and said valve stems are moved by ta- ppets 49 and 50, respectively. The tappet 49 is mounted upon the connecting rod 51 which is slidably mounted in a hole provided in the offset 30 and the lower end of said connecting rod is secured in the tappet 50. The tappet is secured to the piston rod 52 and the latter is slidably mounted within the cylinder provided in the offset 30.

The piston 54 is mounted upon the rod 52 and the spring 55 keeps the piston 54 normally in the position shown in Fig. 1.

The space in the cylinder 53 above the piston 54 is connected by the pipe 56 with any approved form of valve which is arranged to admit air pressure to the upper side of said piston. The pipe 56 passes freely through a hole provided in the tappet 49.

The operation of my improved valve is as follows The parts being in the positions shown in Figs. 1, 2, 4 and 5 and steam. pressure being present within the casing 10 upon the top of the valve 14 and within the duct 46. it is evident that steam pressure will exist in the ducts 45 in the bushings 31 and 32.

The duct 47 in The steam pressure in the duct of the bushing 31 will be prevented from reaching the duct 43 because the corresponding ball valve 36 is against its seat. The ball valve 36 in the bushing 32 being oh? its seat, the steam pressure in the corresponding duct 45 will pass through the duct 44 to the upper side of the piston in the cylinder 18 and, consequently, the pressure of the steam on the top side of said piston will be added to the pressure of the steam on the top side of the valve 14 to keep the same firmly against its seat.

It is to be noted that the piston valve 35 in the bushing 32 is held against a valve seat formed at the end of the corresponding passage 37 and, consequently, the steam from the duct 45 is prevented from passing through the duct 47 to the atmosphere.

If the operator desires to raise the valve 14 he admits air pressure to the pipe 56 which forces the piston 54 downwardly against the pressure of the spring 55. As the piston 54 moves downwardly the tappet 49 moves the valve stem 40 downwardly and moves the corresponding ball valve 36 downwardly against ;the pressure of the steam in the corresponding portion 34. The tappet also moves downwardly and the steam pressure upon the upper end of the corresponding piston valve 35 moves said valve downwardly until the valve face 57 on the lower end of said valve contacts with the valve seat 58 formed on the correspond ing sleeve 39 in order to prevent leakage of steam around the stem 41. When the stem 41 moves downwardly as just descrihech the corresponding' ball valve 36 will he moved downwardly by the steam pressure until it rests on the valve seat at the top of the corresponding passage 37, thus terminating communication between the steam pressure and the upper side of the piston in. the cylinder 18 and at the same time the corresponding piston valve 35 will uncover the duct 47, thus opening communication from the duct 44 to the atmosphere.

As the valve stem 40 moves downwardly the corresponding ball valve 36 will he moved downwardly from its seat and steam pressure will. pass from the duct 45 to the duct 43 and thence to the bottom of the piston in the cylinder 18. At the same time the corresponding piston valve will close the duct 47 which leads to the atmosphere.

lVhe-n steam pressure is admitted to the bottom ofthe piston in the cylinder 18., a pressure is developed which acts upwardly on the piston and is greater than the pressure which acts downwardly upon the valve 14; consequently. the valve 14 is moved upwardly until the surface 16 strikes the surface 18 on the upper head 29 to prevent live steam passing to the exhaust.

The valve 14 then remains in the upper position as long as air pressure is maintained in the pipe 56. l i hen the operator desires to close the valve 14, he shuts off the air pressure from the pipe and connects said pipe to the atmosphere. The spring then moves the piston 54 upwardly and the valve stems 40 and 41 also move upwardly operating their respective valves in a manner that will he clear from the foregoing so as to admit steam pressure to the top of the piston in the cylinder 18 and to connect the bottom of said cylinder to the atmosphere, thus producing a downward motion of the valve 14 to close its port.

It is to he noted theft 1 have made the various ducts through which steam passes to the upper and lower sides of the piston in the cylinder 18, of such sizes that the steam passing tl'ierethrough will be wire-drawn to s .ch an extent as to insure a comparatively slow motion of the valve 14 and the piston which operates same in order to minimize the shock when the valve 14 contacts with its seat and when the surface 16 contacts with the surface 18.

For some applications of my improved valve it may be desirable to maintain air pressure upon the top of the piston disc 16 in order to eliminate the water of condensation from the top of said disc.

When it is desired to maintain air pres sure upon the top of the disc 16, the holes 22-'22 are to be omitted and the steam and air ducts are to be arranged as shown in Fig. 6.

In Fig. (3 the ducts 43 and 44 are the same as the ducts 43 and 44, respectively shown in Fig. 3 and said ducts are similarly connected to the respective valve bushings 31 and 32. The ducts 46 and 48 are connected to the valve bushing 32 in the same manner the ducts 4G and 48 in Fig. 3. The ducts 46 and 48 are connected to the valve hush ing 31 in the same manner as the ducts 46 and 48 in Fig.

A source of air pressure is connected to the duct 46 and a source of steam pressure is connected to the duct 46. The ducts and 48 are connected to the exhaust.

From the foregoing it evident that air pressure will exist upon the top of the disc 16 when the piston is. in the position shown in Fig. 1. Otherwise the operation of the parts is thc same as hetero described.

I will now describe the application of my improved valve to the control of a locomo tive booster as shown (:li'agrammatically in Fig. 7.

59 is the steam dome of a locomotive containing; the throttle valve 60 which is manually operated hy the lever 61. The valve (30 is to open communication through the pipe 62 between the steam dome 59 and the cylinders of the locomotive engine, (not shown). The locomotive engine is to rotate track &

wheels, (not shown), and the direction of rotation of said wheels is to be controlled by the reversing lever 68 which operates a reversing gear fcrn'iing a part of said engine.

The above named parts are old in the art and, therefore, have not been illustrated in detail.

The axle of one of the locomotive track wheels is shown at 64 and the booster engine 65 is intended to add its tractive effort to the tractive effort exerted upon said axle by the locomotive engine.

My improved valve is mounted in any approved location upon the locomotive as, for instance, upon the dome 59, in order to connect the flange 11 of the valve casing 10 to a source of live steam. The duct 46 is to be connected to the pipe 62 between the throttle valve 60 and the locomotive engine. If a superheater is used the duct 46 is to be connected to the pipe 62 between said super-- heater and the locomotive engine.

To the sector 66 of the lever 68 there is secured a bracket upon which the lever 67 is pivotally mounted. The right end of the lever 67 is moved downwardly when the lever 63 is moved toward the right sufficiently to bring the roller 68 under the left end of the lever 67.

Whenever the lever 67 is thus moved it moves the stem 69 downwardly and operates the valve 70 to allow air to flow from the reservoir 71 through the pipe 56 to the top of the piston 54, (shown in Fig 1.)

When air flows to the top of the piston 54 it is moved downwardly and operates the valve stems 4.0 and l1, as before explained.

The valve 14 will still remain in the position shown in Fig. 1 until the throttle valve 60 is operated and steam enters the pipe 62. steam will then flow from the pipe 62 to the duct 46 and then under the piston in the cylinder 18, thus raising the valve 14.

lhe valve 14 will remain raised until the valve 60 is moved to cut off steam from the pipe 62 or until the reverse lever 63 is moved sufficiently to the left to remove the roller 68 from contact with the lever 67.

it is to be noted that by connecting the duct 46 to the pipe 62 between the throttle valve 6() and the locomotive engine that I am enabled to dispense with the pilot valve that is usually employed with booster throttle valves.

While I have shown two preferred forms of my improved valve and one application of said valve to the control of a locomotive booster, it is to be understood that the disclosures are for purposes of illustration only and in nowise to limit the scope of my invention, for various changes may be made in the forms and locations of the parts of said valve and it may be applied for various purposes without departing from the spirit of my invention.

I claim i 1. In a throttle valve, the combination of a casing con'iprising a valve port, a valve for closing said port, a cylinder mounted on said casing, a hollow piston mounted in said cylinder and comprising holes providing communication between the interior thereof and the portion of said cylinder above said piston, said portion being closed: to the exhaust when said valve is closed and open to the exhaust when said valve is open, a valve surface on said piston surrounding said holes, a. hollow rod connecting said cylinder and valve and providing communica tion between the inlet side of said valve and the interior of said cylinder, and a valve surface on said cylinder adapted to contact with the valve surface on said piston when said valve is open to close the passage from the interior of said piston to said cylinder.

2. In a throttle valve, the combination of a casing comprising a valve port, a valve for closing said port, a cylinder mounted on said casing, a rod attached to said valve and extending into said cylinder, a piston mounted on said rod, valves for controlling the admission and exhaust of pressure alternately to and from the sides of said piston, each of said valves comprising a valve bushing having pressure and exhaust openings and an opening connected to said cylinder at one side of said piston,- a piston having valve surfaces at its ends slidably mounted in a cylindrical hole comprised in said bushing and connecting said openings, valve seats in said bushing for contacting with said surfaces and disposed on opposite sides of said exhaust opening, a valve seat in said bushing between said pressure opening and said opening that is connected to said cylinder, a ball for contacting with said last named seat to close the passage between said last two named openings, a stem on said last named piston by which it can be moved and a second stem on said last named piston for moving said ball.

8. The combination with a valve bushing comprising pressure and exhaust openings and a third opening for connection to a mechanism to be controlled by said valve, of a piston having valve surfaces at its ends slidably mounted in a cylindrical hole comprised in said bushing and connecting said openings, valve seats in said bushing for contacting with said surfaces and disposed on opposite sides of said exhaust opening, a valve seat in said bushing between said pressure opening and said third opening. a ball for contacting with said last named seat to close the passage between said pressure and third openings, and a stem on said piston for moving said ball.

In testimony whereof, I affix my signature.

SAMUEL TAYLOR.

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