US1424949A

US1424949A - Automatic steam stop valve

Info

Publication number: US1424949A
Application number: US331432A
Authority: US
Inventors: William B Stork
Original assignee: Individual
Current assignee: Individual
Priority date: 1919-10-17
Filing date: 1919-10-17
Publication date: 1922-08-08
Anticipated expiration: 1939-08-08

Description

w. s1 STORK.

AUTOMATIC STEAM STOP VALVE.

APPLICATION FILED OCI'. I7, 1919.

1,424,949, v Patented Auglg, 1922.

R L I3 A S l o I (o Q N WILLIAM n sToRK, or Anpovnn, iuAssacHsnTTs.

AUTOMATIC sTEAivr sToP vALvni Maisie.

Specification `of Letters Patent. j

AlPai'zented. Aug. f8, 1922.

VApplicationv filed `October-T17, 1.919. Serial No. 331,432.

To @ZZ e0/rom tmay Conce/Ma.'

Be it known that I, ViLLrAM B. STORK, a

' citizen'rof the United States, residin'gatAndover, Essex county7 State'ol Massachusetts,

4have invented certain new vand useful' 'lmprovementsin Automatici Steaml Stop `Valves, oi `which the followingis aV specifi cation. n y

The present invention relates to stop valves ol the type especially adapted for use in connection with steam boilers The objects ot the invention are to provide a valve which will automatically'close'when the pressure on thelboilersidethereof Ais reduced, as when a tube bursts; and also to pro videa valve which will automatically close when the pressure on the steam mai'n side of the valve is reduced as when the steam main breaks. Other objects and'features of novelty will. be apparent 'romthe discription taken in connection withl the drawings-in which4 f Figure 1 is a sectional elevation taken 'through a valve4 Constructed in accordance with the present invention, the valve being shown in closed position;

Figure 2 is a sectional elevation similar to Figure 1 but showing the valve open;

Figure is a transverse sectional 'view taken on the line of Figure 1; and

Figure 1 is a similar vview taken on the line eL-4 ot' Figure 1.y f Referring to the drawings it will be seen that the valve of the present invention comprises a body 1()v formed with an interior chamber 11 having the fluid inlet 12 and the fluid outlet 13. Adjacent the inlet 12 the body is formed with a flange 14 for connecting the same tothe outlet oi the steam'b'oiler. for example, although any other suitable means may be used for making this connection. The outlet 13 has communication with the steam main with which a plurality of boilers may have connectionv there being one-'ot the present valves at the outlet of eachy of the boilers. Above the chamber 11 the body 10 is formed'y as a cylinder 15, therebeing` a pair of spaced

pistons

16 and 17 slidably disposed in this cylinder. Means is alsoprvided to afford Comunication between the chamber 11 and the space above the`upper V'piston 16. As shown this is accomplishedbythe pasi described later.

trolledl by the main valve which is in the forniof a disk 19 adaptedto' engage the seat 20 of the body. vniorider to'pro'perlyguide this disk in its opening and closing movements it may Vbe provided' witha dependin pin 21 slidably mounted in theguider?.i

" valve stem 23 loosely engagesthe upper side ot the disk 19' in'any suitable mannerand also carries the piston17i 'As shown the stem Q3 is reduced at 24 for the piston l'a'nd the piston is clamped against the shoulder thus formed bythe 'nuts 25. The othery piston 16 is secured to the lower end of aspindle 26. This lower'end is counterboredtoreceive the reduced upper end of the spindle This reduced 'upper end' 271 is slida'blv mounted within 'the counterbore of 'the spindlev 26 for limitedfrelative movement. As shown, this-is accomplished by forming theupper end 27 of the stemA with the 'longi tudinal slot 281 Vthrough whichf'a pin 29 extends. said pinf'being carried by the spindle 26. The object of this constructioniwill be The 'upper end ot the valve body 10 is closed by a cap member 30 secured to the body in any suitable ymanner'as by means yof the cap screws 31, The spindle 26 extends through this cap member 30 and the member is formed with acylindrical chamber .32, which. is closed at its upper end by a bonnet v33 through which the Vspindle 26 projects.

The valve chamber '32' has communication with vfluid at the same pressure as inthe inlet passagelQ, that is tosayythe valve has communication with the boiler by means of the pipe 311. The valve chamber 32 also has communication with' the'space between the

pistons

16 and 17, thev aligned

passages

35 and 36 in the walls'of the cap and valve body respectively being provided forthis purpose. Communication between the 4pipe 34 andthe passage 35 is controlled bya pistonvalve t'slidable in the chamber 32. This valve is secured to the spindle 26 and moves with the latter. When the main valve 19 is closed the piston valve 37 is in the position shown in Figure 1 and communication between the pipe 34 and passage 35 is cut off-.'Howeven when the spindle 26 moves upward with the opening movement of the main valve the piston valve 37 assumes they position' shown in Figure 2 and thus the space between the

pistons

16 and 17 is put in communication with the boiler or with iiuid at the saine pressure as in the inlet passage 12 of the valve. In order to permit free longitudinal movement of the piston valve 37 in its chambei', the valve is formed with a pluralityo longitudinally extending passages 38, so that fluid may pass from one side to the other of the piston valves without obstructing the latter.

A suitable st'uiling box 39 is provided `,where the spindle 26 emerges from the bonnet 3 3. The main yvalve is closed by turning the sleeve l0 which operates against a shoulder 41 on the spindle 26. The valve is allowed to open by turning the-sleeve L10 in the direction t0 raise the same.

In the operation of a valve constructed in

l

16 and 17 on their opposite faces are subjected to pressure the same as in the chamberll.' The space between the

pistons

16 and 17, however, is in communication with the-boiler or inlet passage of the valve and consequently the pressure in this space is the same as in the boiler. The valve disk 19 is subjected to boiler pressure on its under face, andon its upper face, to the pressure of the main-steam line, which is the same as the boilerpressure when the valve is .area ot' the. Valve disk.

open. `It is'to be noted further that the valve disk 19 has-a loose connection with the bottom or' the stem Q3, this construction being commonand permitting` steam pressure to be Aexerted `over the entire upper Ii the pressure in the boiler should tall considerably, as from aburst tube or similar cause, there would be a rush of steamy from theniain steam line toward the boiler, which in conjunction v with the. sudden reeucing of pressure in the space immediately below the valve disk would torce the valve shut. It will be observed'th'at the pressures acting on the pisl tons 1 6 and 17 as described above are balsov Asure in the steam main yis reduced.

vthe pressure 1n the steam main 'falls the pressure 1n the space ,above the upperpis- ,anced and hence it is only the difference in `pressures acting on the valve disk that causes it to close vinv this'instance, the valve 19 .and piston 17 being movable together and zindependently ot the piston 16 in a direction to close the valve 19.

. The valvewill also be closed if the pres- .When

ton 16 also falls while the pressure iii the space between the two

pistons

16 and 17 is the same as the boiler pressure. Hence the high pressurey on the lower face of piston n 16 holds this piston upward as far as it will go. The'pressure on the upper face of the lower piston17 is greater than on its lower Hence it is moved downward thus structed in accordance with the present invvention ,will automatically close Vwhen the pressure in the inlet passage is sutliciently reduced or when ythe pressure in the outlet passage is reduced. Furthermore, the present valve is a unitary structure, no outside pilot valvesV orother devices being required.v

Although a. specific yembodiment oit the in-v vention has been described in detail, itis to be understood that the invention is not thus limited, ,but includes iiiodilications` changes which come within the scope o'f the appended claims.

Having thus 4described the'invention what vis claimed 4as new and desired to be secured by Letters `Patent is:

1. An automatic stop valve including in combination, a valve body formed with av chamber having an inlet passage and an outlet passage, a valve controlling the inlet passage constructedfto close wlienthe pressure in the inlet passage is less than in the chamber, a cylinder, a stem connected with the valve extendinginto said cylinder, a pair of spaced pistons in saidcylinder, the one adjacent the valve being secured to said stem, a slidable spindle secured'to the other piston and projecting outside the cylinder, said stem and second piston being connected for limited relative longitudinal movement, the spaces at the opposite'ends of said pistons' being incommunication with fluid at the same pressure as in the outlet passage, and a valve controlling the supplyoit' fluid at thesame pressure.; as in the inlet, to the space between said pistons.

2. An automatic stop valve including` in combination, a valve body havinga chamber 'formed with an linlet passage and an outlet passage, a main valve controlling said inlet passage liavinga stem, a `cylinder aligned with saidstem, a pair of spaced pistons slidable in said cylinder the piston ad-I jacent the valve being secured tosai'dstem, a spindle secured to the second piston'projecting outside the valve body, there being a connection between the stem and second piston to permit limited `relative longitudinalmovement, thespace on the spindle side otsaid second piston .being -in communication with fluid at the saine pressure as in the 4outlet passage, the space. between the .pis-

tons being in communication with `fluid at and igiene-pes the same pressure as in the inlet passage, and a valve controlling said last mentioned communication.

3. An automatic stop valve including in combination, a valve body formed with a chamber and cylinder, said chamber having an inlet passage and an outlet passage, a pair of spaced pistons slidable in said cylinder, a valve controlling said inlet having a stem connected to the adjacent piston, a second cylinder, a piston valve in said second cylinder, a slidable spindle connected with the piston valve and secured to the second of said pistons there being a connection between said stem and the second piston constructed to permit limited relative longitudinal movement, said piston valve being adapted to admit fluid at the same pressure as in the inlet passage, to the space between said pistons and the space above the second piston being in communication with said chamber.

el. An automatic stop valve including in combination, a valve body having a cham` ber provided with a fluid inlet 'passage and an outlet passage, a valve controlling` said inlet constructed to close. when the pressure in the inlet is less than in the outlet and means to close the valve when the pressure in the outlet is less than in the inlet including a cylinder, a piston movable in said cylinder and with said valve, said piston on one face being subject to fluid at the same pressure as in the chamber, and an auxiliary valve carried by said body controlling the supply of fluid at the same pressure as in the inlet, to the other 'face of said piston, said auxiliary valve being opened by the opening movement of the Jfirst mentioned valve.

5. An automatic stop valve including in combination, a valve body having a chamber provided with a fluid inlet passage and an outlet passage, a valve controlling said inlet constructed to close when the pressure in the inlet is less than in the outlet and means to close the valve when the pressure in the outlet is less than in the inlet including a cylinder, a piston movable in said cylinder and with said valve, said piston on one face being subject to fluid at the same pressure as in the chamber, and an auxiln iary piston valve carried by said body coaxially with said piston controlling the supply of fluid at the same pressure as in the inlet to the other face of said piston, said piston valve being automatically opened simultaneously with the opening of the first mentioned valve.

6. An automatic stop valve including in combination, a valve body having a chamber provided with a fluid inlet passage and an outlet passage, a valve controlling said inlet constructed to close when the pressure in the inlet is less than in the outlet and means to close the valve when the pressure in the outlet is less than in the inlet including a cylinder in said body coaxial with said valve, a piston movable in said cylinder and secured to said valve, said piston on one face being subject to fluid at the same pressure as in the chamber, a conduit for supplying fluid at the same pressure as in the inlet, to the other face o'r the piston, a cap secured to the body, and an auxiliary valve in said cap controlling said conduit, said auxiliary7 valve being opened by the opening movement of the first mentioned valve. v

7. An automatic stop valve including in combination, a valve body having a chamber formed with an inlet passage and an outlet passage, a main valve controlling` said inlet passage having a stem, a cylinderaligned'with said stem, a pair of spaced pistons slidable in said cylinder the piston adjacent the valve being secured to said stem, a spindle secured tothe second piston projecting outside the valve body, there being a connection between the stem and second piston to permit limited relative longitudinal movement1 the space on the spindle side of said second piston being in communication with fluid at the same pressure as in the outlet passage, the space between the pistons being in communication with fluid at the same pressure as in the inlet passage, and a valve controlling' said last mentioned communication, said last mentioned valve being secured to said spindle.

8. ln an automatic stop valve, .the combination with a valve body havinga chamber therein provided with an inlet opening having an inwardly facing valve seat and an outlet opening and a cylindrical extension in line with the inlet opening, of a valve in said chamber fitting said valve seat and movable therefrom in the line of said cylinder, a .piston in the .end portion of saidcylinder facing the valve, a connection between said piston and valve, a second piston in said cylinder beyond and spaced from said first piston, the said pistons being movable within limits with reference to each other, cooperating means j for limiting the approach of said pistons towards each other, means for maintaining fluid pressure on the outer face of said second piston equal to that in said chamber to which the face of said lirst piston is exposed, mechanical means for moving` said second piston to such position as to close said valve through the interposed first piston and connection or to a position such as will permit said valve to open, and means controlled by said second piston for supplyingk fluid independent of but under substantially the same pressure as that in the chamber to the space in said cylinder between said pistons when the valve is open.

9. An automatic valve for connecting a ll O l means 'for supplying a en, afi-eases boiler to steam main, comprising in conn able therefrom towards said cylinder', a piston in said cylinder exposed on its under surface to the steam pressure in said chamber, connecting means between said piston and valve whereby they move together, liuid from a ysource separate from the steam main but under substantially the same pressure as the normal pressure in the steam main to the upper side or said piston, thus so balancing it normally as to permit the valve to automatically open or close as the relative pressure in the boiler and steam'main varies, but causing the valve to close through the overbalance of pressure on said piston when the pressure in the main suddenly falls much below normal 'as by'a break in it9 and a second pist-on in said cyl inder above said AFirst piston exposed onits upper or outer race to the steam pressure in the main and movable within limits towards and away from said `lirst piston adapted'in its lower position to close the valve and the supply ot fluid under pressure to the upper surface ot the first mentioned piston, and in its upper' position to open said vfluid connection and to permit the valve to open.

l0. An automatic valve For connecting a boiler to a steam main, comprising in eombination, a valve body or casing provided with a chamber having` an inlet from the boiler and an outlet to the steam main, an automatic control valvetor said inlet adapted to `normally open on an excess of pressure in the boiler, and close on an excess oiz pressure in the steam main, of a cylinder containing two spaced pistons having tree limited lrelative movements substantially equal to the normal movement oi? the valve, means connecting one piston to move with the valve, means for normally' balancingthe pressure on said pistons by means or' steam yconnection from the main to their outer sur- 'aces and a connection from another source or fluid under substantially equal pressure to the space normally between the pistons,

and means for moving said second piston! and closing said connection when the. valve is closed.

ll. An automatic stopvalve including in combination, a valve body formed with a chamber having an inlet passage and an outlet passage, a valve controllingthe inlet passage constructed to yclose when the pressure in the inlet passage is 'less than in ,the chamber, an open ended cylinder in line 'with said valve openingl having a' connection at its upper end tosaid chamber `and having an inlet connection near its central portion to admit iiuid from an independent source under substantially the same pressure pair oit spaced pistons in said cylinder below f said upper connection and adapted when the the normal steam pressure in the main, a j

moving said rod and its piston downwardly towards the valve to cut oil: supply otliuid under pressure through said Ainlet connection, means so connecting said pistons to permit a limited amount or 'tree relative movement, and a rod or stem connecting the inner or lower pistou to said valve to move therewith. Q y

,in testimony wliereoili l ath); my signature.

wiLLiAi/i'e; sToRK.