US2241324A - Valve - Google Patents

Description

L. O. SELBY May 6, 1941,

I 2 Sheets-Sheet 1 VALVE Filed Dec. 26, 1954 May 6,1941.

L. O. SELBY VALVE Filed Dec. 26, 1934 2 Sheets-Sheet 2 WP MEEEEEEG M ME Patented May 6, 1941 VALVE Lynn Otis Selby, -Wethersiield, Conn., assignor to The Sparmal Engineering Corporation, a corporation of Connecticut Application December 26, 1934, Serial No. 759,196

8 Claims. (01. 236-99) My invention relates to valves.

It has among its objects to provide an improved valve, and more particularly an improved thermostatic valve, operative to produce an ex ceedingly sensitive and effective control means and one of an improved, simplified, and rugged construction involving a minimum number of parts of improved construction and adapted to be very economically produced. A further object of my invention is to provide such an improved valve so constructed and associated in an improved manner with the supply passage which it controls, that an improved movable valve member cooperates with the passage and acts to vary the cross section of the latter upon movement relative to said passage, while requiring no conventional seat, and utilizing the bottom and'side walls of the valve member as they traverse the supply passage, to vary the flow through an improved orifice and clear the latter. Another object of my invention is to provide such an improved valve especially adapted to control the oil flow for oil burners 01' various type-gin such manner as to make it possible efiectively to maintain a variable flame at or above a predetermined minimum setting throughout the operation of the burner, while at the same time making it possible for the oil supply to be reduced to minimum limits heretoiore incapable of being obtained, and, even at such minimum settings, maintaining the flow of oil uninterrupted and free from stoppages due tov the accumulation of dirt or scale in the valve mechanism. Still another object of my invention is to provide such a valve for controlling the oil supply or oil burners which hasimproved temperature controlled means and is operative in such manner as to enable the valve to be automatically adjusted from its maximum to its minimum setting described, so that the flow of oil through the valve, and hence to the burner, may be automatically varied to meet the requirements as to selected temperatures to be maintained.

A still further object of my invention is to provide improved means for adjusting the heat, and improved means for adjusting the oil flow whereby the desired adjustments of both may be made with facility. Another object of my invention is to provide an improved combined valve and thermostat especially adapted to be inserted as control means associated therewith, is also adapted to be manufactured at small expense, and to be operative" with certainty over a long period with a minimum of necessary attention. These and other objects of my invention will, however.

hereinafter more fully appear.

In the accompanying drawings I have shown for purposes of illustration several embodiments which my invention may assume in practice.

In these drawings- Figure 1 is a side elevation of one form of an improved thermostatically controlled valve unit,

the same being shown connected in an oil supply line;

Fig. 2 is a vertical sectional view 01 the valve and adjusting connections therefor, the valve being shown in one minimum flow setting;

Fig. 2a is a vertical section through the thermostat of Figs. 1 and 2;

Fig.3 is an enlarged detail view of the valve and the oil supply passage in the above settin Fig. 4 is a like view but showing the valve in full and dotted lines in different positions of more full flow, occupied thereby inresponse to the thermostat; I

Fig. 5 isa sectional view on line 5-5' of Figure 2 Fig. 6 is also a view on line 5-5 but looking in the opposite direction, as indicated by the arrow 6-4;

Fig. 7 is a view similar to Figure 2, but showing a modified construction;

Fig. 8 is an enlarged detailed view similar to Figure 3 but showing this modified construction;

Fig. 9 is an enlarged detail view similar to Figure 4 but showing this modified construction;

Fig. 10 is a view similar to Figures 2 and 7 but a unit in the oil supply line of an oil burner, and

I which is of an improved and simplified construcomitting certain common structure to facilitate illustration I Fig. 10a is a vertical section through the thermostat of Figure 10;

Fig. 11 is an enlarged detail sectional view on linev I I-Il of Figure 10, and

Fig. 12 is a further detailed view showing the form of means for preventing the entry of dirt from the top while permitting the venting of air through the oil line and through these means.

Referring first to the form of the invention shown in Figures 1 to 6 inclusive, it will be noted that I have shown a type of valve adapted to be disposed in an oil line and responsive to changes in atmospheric temperature adjacent the valve, this valve and the thermostatic control means further being improved as will hereinafter more fully appear.

Referring more particularly to this construction, it will be observed that the valve member proper is herein in the form of a valve member or plunger I of uniform cross section, herein cylindrical, and running with a close fit in a cylinder 2, a clearance preferably of from twenty-five ten thous-andths (.0025) of an inch to thirty ten thousandths (.0030) of an inch, and not to exceed thirty-five ten thousandths (.0035) of an inch, being provided, and both the valve member I and cylinder 2 also being substantially elongated, asillustrated: Here it will also be noted that the valve I is shown as provided with a flat circular bottom face 3 at right angles to the axis of the member I. Moreover, it will be noted that the lower extremity of the member. I is so disposed as, with the cylinder 2, to traverse a relatively transverse oil supply passage 4 of smaller cross section than the cylinder 2; the plunger I moving into this passage 4 intermediate the ends of the passage while the cylinder 2 extends above and below the passage. Thus, the opposite edges or side walls, on the extremity of the portion I increase or decrease the cross section 'of the avail able opening through the passage 4 as the plunger I moves up or down in the cylinder 2, to produce a gradual enlargement or decrease of the oil flow through the passage 4. Due to the structure described, including the curved bottom of the passage 4 and the flat face 3 on the plunger I of larger cross section, it will also be noted that it is possible to move the plunger I down into such positions as to permit very minute, yet constant oil flow through the portion of the passage 4 remaining open. For example, it is possible for the plunger to be so far down as not to permit light to be seen through the passage 4 and yet to maintain an effective oil flow orifice adapted to maintain a constant low flame. In fact, a low flame may be maintained even when the adjustment is so fine that it is only possible to blow through the Passage 4.

In the form of my invention shown in Figures 1 to 5, I illustrate one form of bottom support or' limiting means for the plunger which may be used, if desired. Herein, this isin the form of a pin 5 having an upper tapered end 6, preferably tapered to a sharp point similar to that of a sharpened lead pencil point, and engageable with the center of the flat bottom 3. pin is disposed in the portion of the cylinder 2 below the oil passagel and the extreinity of the tapered end 6 is disposed slightly above the bottom of the passage 4 in such manner as to maintain the illustrated minimum oil flow or setting. However, it'will be understood that this oil flow is only illustrative, and that the amount of flow may be varied either by varying the movement of the plunger I relative to a given setting of the pin 5, or by making the latter adjustable. Herein, I have shown the same'as adjustable, and have illustrated the pin as having a threaded portion I on its lower end threaded into a threaded bushing 8 and suitably locked in selected positions therein as by a lock nut 9, while the bushing itself is threaded as at II) in an extension II on the casting I2 in which the cylinder 2 and oil passage 4 are formed. Also, it will be noted that the bushing 8 is herein in the form of a gland acting to compress a suitable packing I3 which surrounds the upper end of the pin though substantially spaced below the extremity thereof. Thus, it will be evident that by adjusting the pm As shown, this 5, asby rotating a nut I4 on the bottom extremity thereof after suitably releasing the lock nut 9, the vertical position of the pointed extremity 5 may be varied as desired, in such manner as to vary the possible bottommost limit of the plunger I and, accordingly, vary the minimum setting by varying the portion of the cross section of the oil passage 4 which is open in the bottommost position of the plunger. Here attention is particularly directed to the fact that due to the pointed portion 6 on the pin 5, the possible area on which dirt, scale or the like may accumulate and interfere with the full downward movement of the member I, is minimized, at the same time that a construction is provided wherein any movement of the bottom face 3 of the member I into or out of contact with the pointed extremity 8 on the pin, will tend to dislodge any material on the point. It will also be observed that an annular chamber I5 surrounds the bottom of the pointed portion 6, which acts to collect any dirt flowing in through the oil passage 4 after the oil has entered beneath one side wall of the plunger I and before it passes out under the opposite side of the latter, dirt in the oil thus tending to be separated out by gravity or contact with the wall of the chamber I5 while the oil passes through the valve. It will also be noted that the oil leaving the. left hand end 'of passagev 4 is herein passed into a larger chamber I3 leadingto the burner. It will be evident that the passage 4 may be cleaned longitudinally when desired through the chamber I6, while the annular passage I5 may also be cleaned by withdrawing-the pin 5 vertically downward.

Operatively associated with my improved valve are improved thermostatic actuating means therefor, disposed above the valve plunger I and operatively connected thereto through improved adjustable operative connections and cooperating with the plunger I to produce improved results. Herein, it will be noted that the valve plunger I is connected by a ball and socket joint 22 at its upper end to the lower end of an upstanding rod 23 of substantially smaller cross section than the cylinder 2 and also of smaller cross section than a passage through a coupling 24, of any suitable length, which is threaded into the top of the casting I2 and carries a thermostat, hereinafter described, which acts on the rod 23. Herein, it will be noted that the member 24 has suitably connected thereto a stationary triangular upright open frame 25, the lower ends of which are brought into spaced parallelism and unitarily connected to an enlargement 26 on the top of the member 24, as by screws 21. Herein, this frame 25 also has a threaded member 28 extending upward through its upper transverse portion, and nuts 29 are threaded on the member 28 outside the frame, while a spring 30 is coiled about the member 28 between the frame and a suitable thermostatically operated expansible means 3I supported on the rod 23 and expansible vertically in the frame 25.

This expansible means is of the well known disc or wafer type adapted to expand and contract vertically upon changes of temperature of the surrounding air, due to the expansion or contraction therein of any suitable expansible or volatile fluid adapted to expand substantially or contract to a substantial extent upon slight changes in temperatures and extremely sensitive and responsive to changes in temperature over the particular temperature range to be controlled. As shown in Fig. 20,, this means 3| comprises two expansible hollow discs 3| containing any suitable quantity of expansible fluid, and these discs are connected by a suitable axial connection having an axial aperture 3| therethrough so that both discs will expand or contract vertically to a substantial extent upon heating or cooling of the contained fluid by the air surrounding the discs. Also, it will be observed that the threaded member 28 has an enlarged lower end 3 I fixed to the top face of the top disc which forms the bottom abutment for the spring 30, while the upper end of the member 28 is slidable through a hole 3 I in the frame 25. Herein, the lower disc of the means 3| also has a coaxial extension 32 on its lower face provided with an annular groove 33 and connected by aset screw 34 entering that groove, to a sleeve 35 threaded on the upper threaded end 36 of the rod 23. Moreover, it will be noted that between the bottom of this sleeve 35 and the top of the portion 26 on the member 24, a turning member 31 is provided which is adapted to rotate the threaded portion 36 in the member 35 in such manner as to cause the valve member to be raised or lowered relative to the portion 35 and thereby vary'the possible expansion, or stroke, of the bellows 3|. Also, it will be observed that a separate lock nut 38 is provided on the threaded portion 36 to fix the member 31. Herein, this nut 38 is disposed as preferably, i. e. spaced somewhat above the top of the portion 26, so that it will not act as a stop limiting the downward movement of the plunger I and that, accordingly, the setting of the valve I may be varied by adjusting the vertical position of the pin 5.

In the operation of this mechanism, it will be evident that with the unit connected in the oil supply line of a burner and the expansible means 3| responsive to changes in the temperature of the atmosphere surrounding the means 3|, an oil flow will be maintained through the oil passage, 4 adapted to maintain a minimum or low flame determined by the setting of the pin 5 while increasing the oil fiow in accordance with the changes in temperature affecting the means 3|. More particularly, with the means 3| extended latter.

downward to the maximum amount permitted by the setting of the pin, which'prevents further downward movement of the plunger a low flame will be maintained of a size determined by that setting, which in turn determines the amount of oil flowing through the passage 4 under the bottom face 3 of .the plunger and around the pointed extremity of the pin 5 in the center of the plunger and out through the like orifice means provided on the opposite side of the plunger. Should the temperature of the atmosphere surrounding the means 3| drop, however, this means will contract vertically in such manner as to pull up the rod 23 and thereby pull up the plunger in such manner as to increase the area of the flow passage through the valve as the lower extremity of the plunger is raised up out of contact with the pointed extremity of the pin. Thus, obviously, the cross section of the orifice provided by the valve between the two parts of the passage 4 will be varied automatically, as determined by the position of the means 3| and the temperature, between the predetermined minimum or low flame setting of the pin 5 and a full open position clearing the passage 4 for full capacity flow'. It will further be evident that by suitably adjusting the pin 5 vertically, the amount of minimum flow and the consequent minimum size of the flame, may be varied within wide limits, while by increasing or decreasing the effective length of the member 36, the temperature to be maintained may be lowered or raised as desired and determined with 'nicety. Moreover, the upper and lower limits are capable of being disposed in a very limited temperature range, the temperature being capable of being maintained within a degree, if desired. In operation, the plunger will assume a balancing relation above pin 5 in such manner as to maintain the desired temperature with only a flame of moderate size, a larger flame only being required following a sudden change in room temperature, as when a door or window is opened.

Attention here is also directed to the fact that the plunger moves freely in the cylinder 2 without binding, irrespective of variations in the connections between the same and the thermostat, the ball and socket joint 23 being such as to maintain the desired free movement of the plunger under all conditions. It will also be observed that although the clearance between the plunger and the cylinder 2 is small, it is still sufiicient to permit air to flow up out of the oil line into the space surrounding the rod 23 and to the atmosphere in such manner as effectually to prevent formation of an air lock in the oil line which otherwise might prevent the flow of oil. Also, it is found that the oil will not flow up through the cylinder 2 and coupling 24 and escape over the top of the Moreover, note here that it is also pos-' sible to" use the plunger I as a pumpsplunger for pumping air out of the line should this be necessary. It is also to be noted that due to the shape of the orifice beneath the bottom face 3 and formed by the latter and the arcuate bottom of the oil passage at opposite sides of the plunger an orifice. is provided which is not only very diflicult to clog, but which is substantially self cleaning, as the adjacent side walls of I the plunger I move with a shearing action vertically relatively to the curved line of intersection between the cylinder 2 and the passage 4, i. e. as the plunger moves in the cylinder 2 across the portions of the'passage 4. Moreover, the point 6 of the pin 5 also tends to be automatically cleared both by the oil flow relative thereto andas a result of the effect of the plunger movement in loosening or dislodging any material which may adhere to the-point so that the material is carried off in the movin oil from obstruction or requiring cleaning of the valve. It will also, of course, be evident that the valve structure, by reason of its simplicity, may be very readily and cheaply manufactured and is of a character adapted to have long life. These and other advantages will, however, be more clearly apparent to those skilled in the art.

In Figure 7, I have illustrated a modified construction which may be used if desired. Here, it will be noted that this structure is essentially similar to that previously described and claimed, although departing therefrom in certain respects hereinafter mentioned. Thus, it will be the member 21, the latterxis adapted to rotate member 35 and is fixed thereto, and a nut 45 is' provided above the member 21 serving as a lock nut for the end of the threaded end 55 of the rod 22. Moreover, it will be noted that a tube 4| is seated in the lower end of the casting R and that this tube at its upper. end is a modified form of pin is provided beneath the plunger I. More particularly, a pin is provided with a pointed end 44 projectable into the oil passage 4 and formed as an axial projection on a shallow cylindrical disc 45 disposed in the lower end of the cylinder 2 and below the oil passage 4. Here it will also be noted that, as heretofore, an adjusting ,screw 45 is seated in a bushing 41 and locked in different positions by a lock nut 45. Also, it will be noted that spaced beneath the disc. 45 and between the same and the screw48, a pointed projection 49, generally corresponding to the member 45, is provided which has a projection 50 corresponding to the pointed projection 44 on the member 45, while acoiled spring 5| is disposed between the bottom of the member 45 and the top of the member 49. In a preferred construction, the spring 5| has its opposite ends fixed to the members 45 and 49 and the member 49 is separate from the member 45, so that the spring with the connected memb s 45 and 49 constitute a unit, but it will be evic nt that, if desired, the member 49 may be formed directly on the pin 45 so that the point 50 forms the upper extremity of the pin, and that in eitherform a spring 5| may be used which simply abuts against the members 45, 49 without being attached to either. Herein, it will also be noted that an open chamber free from packing surrounds the lower end of the spring 5|, while the member 41 is provided with a tapered thread, but it will also be evident that a suitable packing may be used in this chamber, if desired, inwhich case the tapered thread between the parts 41 and II will be unnecessary and a gland generally similar to the gland 8 may be used. 4

In this construction, it will be evident that the spring 5| will constantly urge the projection 44 into contact with the bottom 9 of the plunger and, within limits, urge the latter up out of the maximum down position thereof. Further, it will be evidentthat when the plunger is moved or free to move as a result of temperature changes, the spring will function to produce an even flow of oil and more gradual changes in the area of the flow orifices and consequently in the volume of the flowing oil. It will also be evident that the possible range of upward movement of the projection 44 will depend upon the strength of the spring 5|, and be noted that a substantial range of movement is permitted the point 44 before the member 45 will obstruct the flow through the passage 4. It will also be noted that after the limit of upward movement of the point 44 has been reached, the plunger I may move independently upward as desired. Further, in this construction, it is possible under extreme temperatures for the plunger to be moved downward in such manner as to cut off the flow through the passage 4 if this should be desired, although such a complete cut oif is not desirable save under unusual circumstances; the maintenance, instead, of a constant small circulation of oil to maintain a low flame being denoted that instead of a nut ,being provided under siredin' the huge majority of installations where the;,expansible means is responsive to room temperatures. Also, it will be evident that with the member 50 fixed to the pin 46, and the spring 5| separate from 49, upon simply removing the member 45 and spring 5|, this member 48 may be adjusted upward to produce the construction of Figure 2.

In Figure 10 I have illustrated a further moditied construction which may be used if desired. Here-it will be noted that a one piece casing 52 takes the place of the members I2, 24 and 25 of Figure 2, and of the members I2, 4|, 42, and 25 of Figure 7. This casting 52 has a single upright arm 53 thereon having an overhanging end 54 on which the expansible means in the form of a bellows 55, herein of smaller diameter and of a greater number of sections than that heretofore described, is supported adjacent the top and connected directly to a rod 56 the upper end of which carries an adjusting member 51 fixed thereto, and is threaded, as'shown at 55, into an extension 59 onthe lower end of the bellows 55.

Also, it will be noted that this rod 55 passes pin 6| is used which, in turn, has an axial chamber 62' in its upper end. In this chamber 52 is seated a pointed top member 53 having a point engageable with the face 3 of the plunger and a shoulder 54 thereon and normally pressed up by a coil spring 55 within the chamber 52, against a bent over rim or edge 55 on the upper end of the pin 5|, the remainder of the pin 5| and its adjustable mounting being essentially similar to that shown in Figure 2. Attention is also directed to the fact that the casting 52 here has mere threaded sockets 51 directly at the opposite ends of the oil passage 4.

The operation of this construction will evidently be closely similar to that shown in Figure 7, with the exception that the bent portion 55 in the upper end of the pin 5| will serve as a means of limiting the range of possible upward movement of the pointed member 53, while it will further be evident that adjustment of the pin 5| in either direction will automatically adjust the pin 6| bodily therewith relative to the passage 4 and plunger Here it will also be evident that, as shown in Fig. 100,, the bellows 55 is 01 a type having a deeply corrugated side wall 55* of smaller diameter and an internal central post 55" limiting collapse, this structure being adapted to use in connection with an expansible fluid supplied to the interior thereof through a tube 59 which may be connected in any well known manner to a more remote source of heat to be controlled. It will, of course, also be clear that this construction is not only markedly more simple and inexpensive than those previously described, but that the same is more readily assembled and adjusted, while also eliminating need for a separate top spring. This construction is also adapted to use under difl'erent conditions requiring a wider range of temperature variation. It

isalso adapted to cut oil the fuel flow completely abnormally extended; the valve, as in Fig. 7, also automatically reopening as the temperature sub- 'venting the entryof dirt from the top down through the passageisurrounding theplunger operating rod while continuing to permit air flow for venting, which means may be used on any of the above forms; Here preferably I employ a band H of light, loose string, fabric, or felt, of slightly less diameter than the passage and movable freely'therein without drag, and tied about the rod at any convenient point inside the passage below the threads, it being found that this band acts effectively in'keeping dirt from dropping down and working into the valve while also permitting air flow up through and around the band.

As a result of my improvements, it-will' be noted that previous difllculties in obtaining a satisfactory small flow of oil to maintain a low flame are overcome. More particularly, with needle and other valves previously used, marked difllculties have been experienced with clogging,

due in large part to the annular seat required in such valves and on which material accumulates so quickly, particularly in fine settings of the valve, as to clog the latter and make a low flame go out. In my improved construction, on the contrary, wherein there is no conventional seat or the equivalent of such a seat, it will be observed that no such area is provided on which such a quantity of material may accumulate. Moreover, the opening and closing, being eifected by the side wall of the valve, is such as to produce a very efiective shear or cleaning effect, while the orifice provided is such as to be exceedingly effective and adapted to maintain even a minute flow. It will also be evident that through associating an expansible fluid means with my improved valve, it is made possible to make the latter readily responsive to changes in temperature aflecting these means and, as the temperature changes, to actuate the plunger to obtain an efiective longitudinal movement of the same slowly in either direction of expansible or contractible movement, and to do this while the oil is flowing through my improved orifice in-such manner as to assist in carrying away any such material which seeks to collect either on the walls or on the point and walls and which will be loosened by the movement of the plunger. It will be noted that in this construction the movement of the valve is not only gradual but directly in accordance with temperature changes, as distinguished from delayed action and then sudden movement of the valve. Such a sudden movement results in a most objectionable carbonization of the burner which is eliminated in my improved construction wherein, even after a long period of operation, there is no visible carbonization of the burner. Attention is further directed to the fact that all need for a spring opposing the action of the bellows and acting on the plunger to return the latter is eliminated, with not only a consequent increase in sensitivity of control but an entirely new gradual action of the valve. Here also note that I am able to eliminate both the cost of the springs and any necessity for obtaining matching of all thermostats and springs in order to make it possible to obtain the desired results. It will also be noted that in certain forms, such for example as is shown in Figures 7 and 10, the spring returning the This application is a continuation in part of,

application Serial No. 687,703, filed August 31st, 1933.

While I have in this application specifically described certain embodiments which my invention may assume in practice, it will be understood that these forms of the same are shown for purposes of illustration and that this invention may be modified and embodied in other forms and applied to other devices than oil burners or thermostats without departing from its spirit or the scope of the appended claims. 2

What I claim as new and desire to secure by Letters Patent is:

1. In a valve, a support, temperature responsive expansible means suspended at one end thereof, a rod movable in said support and adjustably connected to said means, a valve plunger movable in said support and operated by said rod, said support having a cylinder in which said plunger moves, a communicating chamber in which said rod moves, and a controlled passage intersecting said cylinder and having the cross section of said passage controlled by said plunger, a plunger abutmentmeans including a pin in the bottom of said cylinder normally inoperative on said plunger and engageable with the lower end of the latter to establish a minimum fiow position of said plunger, and carrying means for said pin including threaded means carried by said support and threaded in said support, and means for adjusting said pin adjustably threaded in said threaded means;

2. In a valve, intersecting plunger and controlled passages, a plunger in the plunger passage movable across said controlled passage to vary the cross section thereof and cooperating with said passages to form a communicating orifice therebetween, expansible fluid operated thermostatically controlled means controlling said plunger and actuating the latter in opposite directions gradually as the expansible fluid gradually responds to temperature changes, and resiliently mounted means beneath said plunger operative on said plunger when the free end oi! the latter moves in one direction across said controlled passage while normally inoperative on said plunger and normally maintained spaced above the bottom of said controlled passage while maintaining said controlled passage substantially free from obstruction.

3. In a thermostatic valve, a valve body having a fluid supply passage and a plunger passage disposed transversely of a controlled portion of said supply passage, and means for controlling said supply passage including a plunger having a controlling portion movable in said plunger passage to vary the cross section of said controlled portion, expansible fluid operated plunger actuating means actuating said plunger in both directions in response to the expansion and contraction of the fluid acting thereon, and abutment means having a pointed end engageable with the end of said plunger mounted in a pertion'or said plunger passage on the opposite side of said controlled portion from said plunger and having its pointed end projecting above the bottom of said supply passage and cooperating with said plunger to maintain a minimum orifice in said controlled portion while maintaining said supply passage. substantially free .from obstruction by said abutment means, said abutment means being resiliently mounted and yieldable to permit cutting on of the supply passage under abnormal temperatures affecting said fluid.

4. In a thermostatic valve. a valve body having a horizontal fluid supply passage extended therethrough, a vertical plunger passage also extended through said valve body and intersecting said supply passage, a plunger vertically reciprocable in said plunger passage to vary the cross section in said supply passage. abutment means in the lower end of said plunger passage comprising a member vertically adjustable therein and having an axial recess in its upper end, an abutment member in said recess having an upper reduced end portion normally projecting into said supply passage and adapted to engage and limit the downward movement of said plunger, and means yieldingly supporting said abutment member in said recess permitting said member to yield downwardly relatively to said adjustable member and permit said plunger to completely close said supply passage.

5. In a valve, 9. support, temperature responsive expansible means supported thereby, a rod movable in said support and adjustably connected to said means, a valve plunger movable in said support and operated by said rod, said support having a cylinder in which said plunger moves, a communicating chamber in which said rod moves, and a controlled passage intersecting said cylinder and controlled by said plunger. a plunger abutment pin in the bottom of said cylinder, a resilient connection between said pin and said support urging said pin into engagementwith said plunger, and adjusting means for said pin including a member adjustably mounted in said support and housing said resilient connection and carrying means for limiting the movement of said pin in one direction.

6. In a thermostatic valve, a valve body having a fluid supply passage, a vertical plunger passage intersecting said supply passage, 8. plunger movable in said plunger passage to vary the cross section of said supply passage, a bracket rigidly connected with said valve body having a portion extended over said plunger passage, 8. corrugated vertically expansible bellows having its upper end rigidly fixed to said laterally extended bracket portion, a coupling member carried by the lower end of said bellows and a connecting rod connecting said plunger withsaid bellows having-an adjustable screw threaded connection with said coupling member, and abutment means comprising an axial member carried by one end of said bellows within the latter and engaging the opposite end of said bellows to limit the collapsing movement thereof.

'1. In a control valve 01' the class described.

comprising a long vertically arranged casing having a small vertically. arranged bore therein. the lower end of which is enlarged, and a transversely arranged fluid passage intersecting the bore slightly above the enlargedpart thereof, an

part of the bore, with that part of the enlarged portion above the plug forming a chamber, a screw threaded in the plug, a spring having its lower end engaging the screw, and a pin in that part of the bore below the passage and having one end engaged by the upper end of the spring and its opposite end engaging the bottom or the core, and temperature responsive means operatively connected to the upper end of the core.

8. In a control valve of the class described comprising along vertically arranged casing having a small vertically arranged bore therein, the lower end of which is enlarged. and a transversely arranged fluid passage intersecting the bore slightly above the enlarged part thereof, an imperforate valve core slidaLly arranged in the bore and having a snug fit therein and closing the passage when the lower end oi the core is in that part of the bore below the passage, a plug threaded in the lower end of the enlarged part of the bore, with that part of the enlarged portion above the plug forming a chamber, a screw threaded in the plug, a spring having its lower and engaging the screw, a pin in that part of the bore below the passage and having one end engaged by the upper end of the spring and its opposite end engaging the bottom of the core, temperature responsive means operatively connected to the upper end of the core, such means including a rod having a ball and socket connection with the upper end of the core and said rod having a loose flt with that part of the bore through which it passes.

LYNN OTIS SELBY.

CERTIFICATE OF CORRECTION.

Patent No. 2,214.1 ,52u. May 6, 191:1.

LYNN owls SELBY.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 11., second column, line 11, for the word "casing" read "casting"; page 5, second column, line 56, claim 1, strike out "a" first occurrence; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed 'and sealed this 15th day of Jul A. D. 19in.

Henry Van Arsdale, (Seal) Acting Commissioner of Patents.

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