USRE3603E - Improvement in slide-valves - Google Patents

Improvement in slide-valves Download PDF

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Publication number
USRE3603E
USRE3603E US RE3603 E USRE3603 E US RE3603E
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US
United States
Prior art keywords
steam
valve
ring
pressure
slide
Prior art date
Application number
Inventor
Orlo Oady
Original Assignee
By Mesne Assignments
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  • FIG. 1 is a central vertical section of fig. 1, through the line a: x, the valve being shown covering both steamports.
  • Figure 3 is avertical sectional elevation'of-the valve, constructed on a somewhat different plan, but involving the same method of producing an equilibrium of pressure.
  • Figure 4 shows a -longitudinal section of a steamcylinder, with the piston and piston-rod packed, upon the same plan of counteracting pressures, or obtaining lateral pressure, by forcing together wedge -shaped -rings,'t11e force exerted ⁇ through the gland, at It It,
  • the object of this improvement is to so construct a Avalvethat there shall beA an equilibrium of pressure tlwreon, or so that thepressure on ⁇ the upper side shall ,bebalanced by the pressure on the underside vof ,the
  • valve to the extent of Ithe ⁇ surfaces exposed to such action; andA It consists in inserting and fixing in the central part of the valve, between the two ends thereof, a ring, constructed with a auge on its outer side, over the top surface of the valve, the top side of the flange forming a llet,towork against the cover of theivalvechest, and of equal area with the bottom side of the flange.
  • This ring is also constructed and fitted so as ⁇ to ad- 'mlt of an equal areaof steam-space above and below its inner part.
  • the steam from the boiler will be caused to act simultaneously on the bottom of the flange, thereby pressing the ring upward against theJ cover of the valve-chest, and on the fillet or top of the flange, ofl equal area, thereby pressing the ling. downward.
  • the steam yfromv the boiler will thus be caused to act overan equal area between the cover of the valvechest or the division-Y platc, Iand the fillet or top of the flange, and between the bottom of the flange and the top of the valve, thereby balancing the pressure on the outer part of the ring.
  • the recess or steam-space, at the top of thc inner part of the ring, is equal in area to that at the-bottom of the same, and the ring is balanced by the pressure of the exhaust steam acting equally thereon.
  • A represents the valve.
  • valve-rod secured to the bridle.
  • the inlet-port of the steam-chest may be made in any proper place, either upon the topor sides.
  • F E are the steam-ports in the cylinder-face.
  • .. Gr is the exhaust through the cover of the steamchest.
  • H is a ring,inserted in the valve A, for the .purpose of effecting the required displacement of steam. so as to cause a balance of steam-pressure.
  • This ring H is cast larger than -'the cavity of the valve A.
  • the ring is then drawn together at but-joint, shown at L, iig. 1, and, in that position, bored and turned in the lathe, to tit its place in theA valve.
  • a steady-pin, b, g. 2 is used to-keep the but-joint in the centre line of motion.
  • M M Two small springs, M M, are inserted between thel ring and valve, in order tokeep it up to the cover ⁇ of the steam-chesnwhile steam is oli'.
  • the ring H is provided with a illet, N, which Works v against thecover D, and the ring is recessed inside,
  • the ring H being recessed at 0, the exhaust pressure of a high-pressure engine, and the vacuum of a low-pressure, engine, act equally' on the top and bottom sides, holding it in an equilibrium of pressure.
  • the recesses a a in the face of the valve, are for the purpose of' maintaining the film of' steam on the bars duxinghighgrades of expansion; also, serving the purpose flubrication-by steam.
  • - Fig. 3 shows-a valve, constrii" ig'on the samrrprinciple .as the one described, but 'different plan'.
  • T T are rings, provided with recesses or steam-spaces, U U, by which the amount o f power pressing against such rings may be regulated, according ⁇ to the siu'face of such recesses.
  • the amount of force on the outer surface of the rings S, and the inner surface of the cylinder, may be regulated by varying the angle ofthe ringsS.
  • Steam is admitted to the recesses U through small holes, V V; but it may also be applied directly to the rings S, dispensing entirely with the rings T.
  • the gland W- is made substantially the same as the piston, except that the atmospheric air acts through the outer holes R instead of steam.

Description

dini/tml gieten @anni @mine OELO OADY, OE MOEEIsTOWN, VERMONT, AND WILLIAM W. W. WOOD, OE BROOK- LYN, NEW YORK, ASSIGNEES, EY MEsNE ASSIGNMENTS, OE THOMAS ADAMS AND GEORGE JOHN PARSON.
Lette/rs Patent No. 68,932, dated September 17 1867; patented 'in England, February 15, 1866; lreissue No. 3,603, dated August 17, 1869.
IMPROVEMENT IN SLIDE-VALVES 'The `Schedule referred to in these Letters Patent andmakng part of the same.
which-will enable others skilled in the art to which our invention appeitains', to make and use the same, reference beingshad to the accompanying drawings, fonning part of this specification, and in which- Figure 1 is a plan view of our slidevalve, with the top plate or cover ofthe steam-chest removed.
l Figure`2 is a central vertical section of fig. 1, through the line a: x, the valve being shown covering both steamports.
Figure 3 is avertical sectional elevation'of-the valve, constructed on a somewhat different plan, but involving the same method of producing an equilibrium of pressure. f
Figure 4 shows a -longitudinal section of a steamcylinder, with the piston and piston-rod packed, upon the same plan of counteracting pressures, or obtaining lateral pressure, by forcing together wedge -shaped -rings,'t11e force exerted` through the gland, at It It,
being atmospheric, pressure.
Similar letters of reference indicate corresponding parts in the several gures.
The object of this improvement is to so construct a Avalvethat there shall beA an equilibrium of pressure tlwreon, or so that thepressure on `the upper side shall ,bebalanced by the pressure on the underside vof ,the
valve, to the extent of Ithe `surfaces exposed to such action; andA It consists in inserting and fixing in the central part of the valve, between the two ends thereof, a ring, constructed with a auge on its outer side, over the top surface of the valve, the top side of the flange forming a llet,towork against the cover of theivalvechest, and of equal area with the bottom side of the flange. y
This ring is also constructed and fitted so as` to ad- 'mlt of an equal areaof steam-space above and below its inner part.
By the insertion of a ring so constructed, the steam from the boiler will be caused to act simultaneously on the bottom of the flange, thereby pressing the ring upward against theJ cover of the valve-chest, and on the fillet or top of the flange, ofl equal area, thereby pressing the ling. downward. The steam yfromv the boiler will thus be caused to act overan equal area between the cover of the valvechest or the division-Y platc, Iand the fillet or top of the flange, and between the bottom of the flange and the top of the valve, thereby balancing the pressure on the outer part of the ring.
The recess or steam-space, at the top of thc inner part of the ring, is equal in area to that at the-bottom of the same, and the ring is balanced by the pressure of the exhaust steam acting equally thereon.
A represents the valve. y
O, the valve-rod secured to the bridle.
B, the inlet-port of the steam-chest, may be made in any proper place, either upon the topor sides.
E, the cylinder-face.
F E are the steam-ports in the cylinder-face.
.. Gr is the exhaust through the cover of the steamchest.
H is a ring,inserted in the valve A, for the .purpose of effecting the required displacement of steam. so as to cause a balance of steam-pressure.
This ring H is cast larger than -'the cavity of the valve A. A piece, say one-sixteenth of an inch, is cut out of it.A The ring is then drawn together at but-joint, shown at L, iig. 1, and, in that position, bored and turned in the lathe, to tit its place in theA valve. A steady-pin, b, g. 2, is used to-keep the but-joint in the centre line of motion.
Two small springs, M M, are inserted between thel ring and valve, in order tokeep it up to the cover` of the steam-chesnwhile steam is oli'.
The ring H is provided with a illet, N, which Works v against thecover D, and the ring is recessed inside,
' The steamin the cnest acts from the boiler simul# taneously under the fillet, or on the bottom of the ilange,'thereby pressing the ring upward against theV cover D, and on the fillet or top of the ilan'ge of equal area, thereby pressing the ring downward. The steam being thus caused to act over an equal area between the cover D and the fillet or top of the flange, and.
between the bottonr of' the flange and the top of the `valve, thereby balances the pressure upon the outer part of the ling; or, in other words, the steam, being allowed to act under the fillet, and exertingits inu.
ence between the top side of the fillet and the cover, is heldin an equilibrium of pressure.
The ring H being recessed at 0, the exhaust pressure of a high-pressure engine, and the vacuum of a low-pressure, engine, act equally' on the top and bottom sides, holding it in an equilibrium of pressure.
The recesses a a, in the face of the valve, are for the purpose of' maintaining the film of' steam on the bars duxinghighgrades of expansion; also, serving the purpose flubrication-by steam. y
- Fig. 3 shows-a valve, constrii" ig'on the samrrprinciple .as the one described, but 'different plan'.
.This principle of balancingzthe v opposite sur'iices,
which are exposed to the action of steam, may also be employed with good effectin the construction of. pistons and vglands, as shown in red in' fig. 4, described as follows: Y
Two -paeking-rings,S S, are pressed outward against the inside' of the cylinder, by the pressure of steam in a vertical'direction. T T are rings, provided with recesses or steam-spaces, U U, by which the amount o f power pressing against such rings may be regulated, according` to the siu'face of such recesses. The amount of force on the outer surface of the rings S, and the inner surface of the cylinder, may be regulated by varying the angle ofthe ringsS. Steam is admitted to the recesses U through small holes, V V; but it may also be applied directly to the rings S, dispensing entirely with the rings T. The gland W-is made substantially the same as the piston, except that the atmospheric air acts through the outer holes R instead of steam.
Having thus described the invention,
We claim, and desire to secure by Letters Patent- A slide-valve, having a ring, H, provided with a fillet, N, and recess, 0, so that the pressure of steam stantially'as described. 4
In testimony whereof, We have signed our names to this speciiication, each before two subscribing Witnesses.
URLO GABY. WM. XV. W. WOOD.
on the different surfaces will balance the valve,sub

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