US2241326A - Thermostatically controlled oil burner - Google Patents

Description

May 6, 1941. L Q SELBY- 2,241,326"

THERMOSTATI CALLY CONTROLLED OIL BURNER May 6, 1941. L.' o. sELBY fTHERMosTATIcALLY coNTRoLLED 011. BURNER s sheds-sheet 2 Filed Oct'. 9, 1936 May 6, 1941. L Q. sELBY 2,241,326

THERMOSTATICALLY CONTROLLED O IL BURNER Filed oct. 9, 193e s sheets-sheet 3 Hg. a /79/2 Patented May 6, 1941 Lynn Otis Selby, Hartford, Conn., assignor to The Sparmal Engineering Corporation, a corporav, tion of Connecticut 20 Claims.

My invention relates to thermostatieally lcontrolled oil burners.

It has among its objects to provide an improved thermostatically controlled oil burner and one especially adapted to use in refrigerators of the absorption type. A further obj ect is to provide an supplying fuel to the burner of such a refrigerator having a movable valve element directly actuatedby the thermo-responsive element to in- Application October 9, 1936, Serial No. 104,808

`improved 'thermostatically controlled valve for v crease the supply of fuel to theburner upon expension of the thermo-responsive element and decrease the supply upon contraction thereofln a new and improved manner. A still i'urtherA object is to provide an improved thermostatically controlled valve for controlling a distillate burner.

Another object is to provide such an improved valve especially adapted for use in an absorptiontype refrigerator and having, in a unitary structure withthe temperature controlled valve, both improved high and low flame adjusting means.

A still further object is to provide an improved ,thermcstatically controlled valve of the plunger type in which the thermally expansible element is supported directly on the valve housing. Another object is to provide an improved thermostatically controlled valve in which .the high and Fiig. 5a is a plan view of the valve of Fig- Flg. 6 is a full size sectional elevation of another modiiled valve construction:

Fig. 7 is a section on line 'i-I of Fig. 6;

Fig. 8 is a section on line 8 0 of Fig. 6;

Fig. 9 is an elevation, partly in section, of a construction, applicable to any of the above modied forms of valve. for connecting the valve plunger to the expansible fluid operated member of the thermostat; i f

Fig. 1o is a. fun size seccional elevation of sun anlother modified thermostatically controlled va ve;

y Fig. 11 is an elevation of the plunger assembly of the valve of Fig. 10; y 4 Y Fig. 12 is a sectional detail on line Il -il of Fig. 1o; Fig. 13isafu1l size other n'iodied form trolled valve;

Fig. 14 is an elevation of the plunger assembly of the valve of Fig. 13, and

tional elevation of an- Fig. 1e is a dei-.an view somewhat similai-4 to Fig. 9V showing a connection suitable'for use with the valve forms shown in Figs. 10 and 13.

low flame adjusting means are concentric with the temperature controlled valve. Other objects. are .to provide an improved thermostatically controlled valve which can be cheaply and easily thermostatically controlled valve, certain of.

manufactured. which occupies a minimum of space, and which can be installed in the limited space available in existing refrigerators of the oil burning type in place of the manually controlled valves now in use.' These and other objects and advantages of my improved construction will, however, hereinafter more fully appear. In the accompanying drawings I have shown for purposes of ilhmtraticn several embodiments wh my invention -may assume in practice. f these drawings- `Figure 1 is an elevation partly in section .of an oil fburning refrigerator equipped with my ignprovement, only' those parts of the refrigerator being shown which are necessary to an understanding of the invention;

' Fis. 2 is a full size sectionaly elevation of the thermostatically controlled valve of Figure 1; Fig. 3 is a section on line I-lof Figure 2;

Fig. 4 ls a section on line H of Figure 2 with Y certain parts omitted; Y

In these drawings, I have shown for purposes of illustration several forms of my improved which were disclosed and claimed in an application, Serial No. 75,991, filed April 23, 1936. of which the present application is a continuation ln part. In all of the various forms shown, my

improved valve A is adapted to control a distillate' type oil burner B -of a well known Serveltrefrigerator. indicated generally at C, and including Fig. 5 is a full size sectional elevation 'of a modified form of thermostatieally controlledv valve;

the usual lboiler, or generator. I, freezing unit 2. fuel supply tankwl and co tant level oat chamber! provided with a co er 4a. all in such manner as' hereinafter described to enable improved rsults to be obtained never before obtainable ln an oil burning refrigerator.

In this well known BerveP construction. oil from the tank` lis supplied through feed line l to chamber l and the oil is maintained at a` constant level 4b in chamber I' by means of ya usual float valve l governed by a noat'l. the usual safety trip bucket l and reset lever.. -being provided. The fuel is led from the constant level chamber'l to the car-bon leg il of the Aburner through a feed line I I having a usual gravity 0P- erated high temperature cut-off valve il controlled by a fusible link il located adjacent the` burner B. The chamber ,4 is also provided on one -side wall with a generally cylindrical valve hous-` thermostaticaily coni by means of which the fuel supply tothe burner y B was governed.

In accordance with the present invention, the improved thermostatically governed control valve A for automatically regulating oil flow to they lburner B is adapted to be threaded into passage I6, this valve A including an improved valve and thermostatically controlled means associated therewith in an improved manner and both of the same cooperating lto enable an improved automatically operative temperature responsive control to be obtained for the firstl time in a refrigerator of this type.

In Figures 1 -4, Ihave shown a preferred form of my improved thermostatically controlled valvel A. As shown most clearly in Figures 2, 3 and 4, the valve casing I1 comprises a piece of cylindrical stock, the lower end I 8 of which is reduced in diameter and threaded to be received in the passage I6 at the bottom of the oil well I5,` a suitable gasket I9 forming a fluid tight closure for the oil well at this point and preventing fluid communication, with the main oat chamber 4 except through the valve, as hereinafter explained. The valve casing I1 is provided with a vertical plunger passage 20 terminating sometion 2|. This passage bisects an intersecting horizontal passage 22 which communicates at one end with the well I and at its other end with the iioat chamber .4' through a series of passages 23, 24 and 25, as is shown most clearly in Figure 2. The cross sectionl of the passage 22 is varied by a vertically reciprocable plunger 26 which is adapted to be reciprocated in the plunger passage 20 by expansible fluid actuated means hereinafter described.

In this preferred form, the plunger 26 includes a generally cylindrical portion 26a having a. close 'running t in the plunger passage 20. An annular groove 21 is-provided near the lower end of portion 26a forming a control portion 28 at `the lower end of the plunger which is normally located in they transverse passage 22, as/,lshown in Figure v2, and controls t he passagef-'fof fluid through the valve as tl'f""annular' groove 21 is moved more or less Into register with the passage The plunger 26 has a reduced upper end portion 30 threaded at 3l and forming an upward1y facmgrshouider s2 located within the threaded portidn 2I of the valve casing I1. The shoulder 32 cooperates with the lower end of a threaded sleeve 33 which surrounds and guides the upper end ofthe plunger. Sleeve 33 is formed with an upper hexagonal portion 34 to permit rotation of the sleeve to adjust the sanie verti- A needle valve 36 is screw threaded intoA a passage 31 aligned with passage 23 in the valve casing I1 and intersects the horizontal passage 22. The passage 31and the needle valve 36 are of somewhat larger diameter than passage 23, thus providing a seat 31a (Fig. 4) a't the. upper end of the latter passage for the tapered end of the needle valve. A hexagonal upper end portion 38 is provided for the rotation of the needle valve 36 for adjusting the same relative to its seat, thereby to establish the maximum flame adjustment for the burner.

The reciprocation of the plunger 26 in the plunger passage is governed by expansible fluid operated means including an expansible wafer 40, the upper end 4I of which carries a exible supporting diaphragm 42 which has its periphery clamped by screws 42a between upper and lower complemental housing and supporting members 43 and 44. The expansible wafer 40 is accurately centrally located within the housing by the provision of an upstanding annular flange45 on housing member 44 within which the diaphragm 42 is closely received. The lower housing member 44 is formed with a depending cylindrical boss 46 having an axial passage in which a bushing 41 is located. 'I'he upper housing member 43 is also provided with an axial bushing 48 in which is threaded a stud 49 which, upon rotation in one direction, bears at its lower end on the hollow boss 56 formed' on the upper end wall 4I of the expansible member and fiexes the diaphragm 42 downwardly, thus depressing the wafer 40. The stud 49 is formed with-an octago- 1 what above the lower end o'f the casing and havlng a slightly enlarged threaded upper end pornal head which is received in an octagonal recess in an externally cylindrical member 5I secured to the stud by an axial screw 5Ia. Manual rotation ofy the stud 49 to control the position of the c expansible member 46 is accomplished by a rotatable 'control button 52 movable over a suitable dial located on the refrigerator and a control cable 53, cooperating stops 53a and 53h being provided on the member 5I and casing 43 to limit the rotation of the stud.

'Ihe expansible member 46 is of a well known type adapted to contain an expansible fluid and communicates through a tube 54 extending into the hollow boss with a temperature responsive element 55 located in the refrigerator compartment adjacent the cooling unit 2. It will'be understood that the tube 54 and-temperature responsive element 55 likewise contain expansible iluid and that the expansion and contraction of the fluid in elementv 55 is conveyed to and inuences the expansible member 40. The plunger 26 is directly connected 'to the lower end wall 56 of the expansible member.i To this end the lower wall 56 thereof has an integral depending stem 51, guided in the bushing 41, which is provided cally to vary the point at'which the shoulder 32 with a screw threaded recess .56 to. receive the threaded portion 3| of the plunger. A knurled adjusting wheel 59 is initially threaded onto the plunger 26 and is fixed thereto by a lock nut 60 so that rotattion of the wheel 58 will rotate the plunivrferl relative to the stem 51 and adjust the plunger vertically relative to the wafer 4|).v

The expansible member 40 and its, housing are supported above the plunger and in `axial alignment therewith by means of -a tubular supporting member 6I having a portion of its sidewall in termediate its ends cut away to permit access to thewheel 59 and the high and low flame adjustments. The tubular member 6I `has an enlarged lower end portion 6Ia which fits over a reduced cylindrical portion 62 at the top of the valve casannees ing I1 and preferably is secured permanently thereto as by soldering or welding. The outer surber 3|, a screw 34being provided to prevent relative movement of the parts. As shown most clearly in Figure 3, an opening 33 is provided in the lower hexagonal portion Bla permitting access to the set screw 33.

As` shown'most clearly in Figure 2, a ball and socket connection 33 is provided between the plunger rod 33 and the portion 23a thereof, although this may be omitted if care is taken in the manufacture and assembly of th'e `valve. Here vit should also be noted that to prevent binding of the valve plunger the passage in the low flame adjustment sleeve 33 is slightly larger than the valve stem33, thus eliminating'any tendency for the plunger to bind due to mlsalignment of the expansible member and its support.

- 'I'he plunger 23 is limited in its upward movethe lower end of the low llame adjusting. sleeve 33 previously referred to, the latter being vertically adjustable in the plunger passage 23 to vary the upper limitof movement of the plunger. As'shown most clearly in Figure 2, a definite relation exists between the shoulder 32 on the plunger and the lower shoulder 23 formed by the groove 21, these shoulders being so arranged that the engagement of the lower end of sleeve 33 with shoulder 32 takes place when the control portion 23 of the plunger has almost completely ment by the engagement `of the shoulder 32 with proaching the point at which it completely closes this passage, the sleeve 33 being adjusted to permit only a low ame orifice. It will also be underswod that the adjustment of the needle valve 33 relative to the s'eat 31a determines the4 maximum volume of oil which can pass through passsge 22 and thus constitutes the maximum llame adjustment of the-valve.

In the operation of this preferred form of my improved Valve construction, it will be evident that oil is maintained in the constant level chamber 4 at the level 4b which is sufilciently high to admit oil to the burner base but is below the top of the burner groove 31 so that flooding of the burner is impossible, even if the burnershould go out. Also itwill be clear that, as determined by the position of the plunger 23 in the plunger passage 23, oil will be supplied from chamber 4 through the passages 23, 24 and 23 past the needle 33 of themetering valve throughv passage 22 and annular groove 21 to the oil well 'I3 from which the oil is supplied to the burner through feed line Il. 'I'he maximum flow of oil is determined by the setting of the needle-valve 33 and the mini` a pilot flame is maintained in the burner.

'In the position ofthe parts shown in Fig. 2,

'the control button 32 is in the defrost position. -marked 0" on the dial, and consequently the stud 43 is in its uppermost position inwhich the diaphragm 42 is relaxed and wafer 43 is elevated to enabletheshoulder 32 on plunger 23 to engagethe lowerend of lowflame adjusting sleeve 33,- although the temperature responsive element 33 is at room temperature and wafer 43 is expanded. Defrosting continues with the burner B remaining on minimum flame until the control button 32 is rotated'to an advanced position on the dial to cause stud 43 to depress the wafer 43 and with it the plunger 2,3. Assuming that control button 32 is rotated toits other extreme position, marked "5 on the dial, which represents the lowest temperature at which it isv supplying the -burner B with the 'maximuml amount of oil as determined by the setting of the metering valve 36. As the temperature in freezing unit 2 is lowered, the wafer 4will con-Y tract and shoulder 32 will ultimately engage `the i stop provided by sleeve 33, when the burnerwill burn with only a pilot flame. It will be understood that rotating the button 32 to an intermediate position on the4 dial will result in the enga'gement of shoulder 32 and sleeve 33 at a relatively higher temperature in the refrigerator compartment. Y I

It will be evident from the above description that to install my improved thermostatically controlled valve A in existing refrigerators, it is only necessary .to remove the manually controlled metering valve hitherto in use from the oil well I3 and replace it with the improved valve above described.

In adjusting the valve, the metering valve 33 is rst adjusted lwith a plunger 23 depressed so that groove 21 registers with the outlet passage 22. In making this adjustment, the needle valve 33 is turned back away from seat 31a until the burner is supplied with the maximum amount of -oil which it can consume without smoking. The

plunger is then released and the low llame ad justment is made by turning the sleeve 33 until it engages theshoulder 32 at a point when the shoulder 23 is slightly below the point of cutoi'f, permitting only a minimum flow of' oil to the burner suillcient to maintain a pilot flame. The wheel '33 is then adjusted relative to the stem 31 to obtain the proper` temperature setting for the thermostat. It will be evident that both the high ilame and low flame adjustments can be varied in this construction without affecting the adjustment of the plunger by wheel 53 relative to the expansible wafer 43. Y

In Figures 5 and 5a I-have shown a modified construction in which a valve casing Ila is pro-l vided, generally similar to casing I1, and in which the high and low flame adjustment means and the oil passage through the valve are similar but wherein the expansible member 43 has its supporting diaphragm 42 clamped between two annular rings 33 and 33 which are rotatably supment over the plunger, a clamping nut 13e being provided on the upper end of the standard 13 which when loosened permits the expansible member 4 3 and its supporting means to be swung laterally out of the way andpermit withdrawal Iof the plunger.4 In this construction there is no expansible member. Instead, an anvil 1| is ad` justably screw threaded to the upper end of the plunger, thus providing for varying the temperaturesetting, the plunger rod having a flattened portion 12 which enables the rod to be held and the anvil 1| .rotated relativejthereto. A compression spring 18 surrounding the plunger bears at its lower end on the upper end of the low flame adjusting sleeve 88 and at its upper end on the anvil 1| fixed to the plunger, thus constantly urging the plunger against the expansible member-40.

In Figures 6, 7, and 8, I have shown a modified form of valve which may be used if desired. In this modified construction, the inlet passage 25 in valve casing |1b communicates directly with the plunger passage 20 and the plunger portion 28a isprovided at its lower end with an axial passage 14 which communicates with a transverse passage 15, the ends of which-terminate in the groove 21. Also in this construction a spring 13a is located beneath the plunger and acts against a shoulder 18 at the bottom of the plunger passage for constantly biasing the plunger upwardly into the position shown inv Figure 6 in which the shoulder 82 engages the lower end of the low flame adjusting sleeve 88. The operation of this valve will be obvious from the description of the previously described forms. l

In Figure 9 I have shown a modified construction which is applicable to any of the above forms of valve by which the upper screw threaded Aend of the reciprocable plunger can be directly connected by a ball, and socket joint to the lower end of the expansible member 40. As shown in V88a and is adapted to be a close but free running iit in the bore 80. The plunger 83 is also formed with an annular enlargement 90 intermediate lts ends providing a shoulder 9| which cooperates with the lower end of an externally screw threaded sleeve 92 in which the plunger has a free running t. The sleeve 92 has a hexagonal head 82a |by which it is adjusted vertically in' the upper screw threaded portion 8| of the valve v casing I 1c.

A metering valve is provided in the axial passage of plunger 88 comprising a stem 93 which is reciprocable in the upper enlarged portion 81 and a reduced needle portion 84 which cooperates with the valve seat 88a, a spring 95 located 4 in the passage 81 between the spring seat 81a and the shoulder 88 on valve stem 98 constantly biasing the latter into engagement with a cam' surface 91 on a transversely adjustable pin 98 which is threaded at 98a into the valve plunger 88. The pin 98 is provided with a radial spoke 99 Iby which it is rotated to move the cam surface 91 laterally and adjust the needle 94 relative to seat 86a, andis also provided with a fixed head |00 which prevents accidental removal of the pin. The axial passage in plunger this figure, the lower end wall of the expansible 1 In Figures 10-12 I have shown still another.

modified form of my improved thermostatically controlled valve A. As shown most clearly in Figure 12, the valve casing IIc comprises a piece of hexagonal stock, the lower threadedend I8 of which is provided with a small axial inlet passage 25 which communicates with an enlarged axial .bore 80' threaded at its upper end at 8|. The

passage 80 constitutes a vertical'plunger passage which communicates with the float chamber 4 through passage 25.l The valve casing I1c also has a lateral oil passage 82 below the oil level 4b which communicates with the well I5 and the cross section of which is varied by the vertical reciprocable plunger, shown most clearly in Figure 11, as the latter is vreciprocated in' passage 80.

In this form of valve the plunger comprises a generally cylindrical tubular member 88 having an axial passage therethrough vcomprising av lower portion 85 of small diameter lforming a valve seat 88a. an intermediate portion 889i slightly increased diametenand an upper portion 81 of still greater diameter providing an up wardly facing shoulder or spring seat 81a. A

lateral passage 88 is provided in the plunger intersecting the axial passage therein just above the seat 88a and terminating in an external an- 88 is threaded at its upper end t0 receive a vertically adjustable anvil |0I, a lock nut |0|a being provided to holdy the anvil in adjusted position.

It will be evident from the above description that an oil passage is provided through the valve from float chamber 4 through the axial passages 25 and 85, and the transverse passages 88 and 82 to the well I5. It will also be evident that as the plunger 83 is reciprocated in the' The reciprocation of plunger 83 is governed byv the expansible member 40 as described in connection with Figure 5, a. spring |02 located in the bore 80 beneath the plunger constantly urg- `ing the plunger 88 upwardly into position to en- .gage the shoulder 9| with the lower end of the low flame adjusting sleeve 92, as described in connection with previous forms.

In Figures 13 and 14 I have shown a modified form of concentric valve whichmay be used if desired. In this modied lconstruction the -valve casing I1c is the same but the plunger asits upper end. A lock nut |05a is provided for clamping the valve |08 in adjusted position. To assist in holding the plunger during adjustment of the metering valve |03', diametrically opposed flat portions |08 (Figure 14) are provided at the upper end of the plunger adjacent the clamping nut |05a. A vertically adjustable anvil |01 is erators.

l pl'OceSSeS.

threaded into the upper end of the valve |03 and engages the wafer 4.0.

The operation of the valve of this modified construction-is similar to those above described, thehigh llame adjustment being made by rotating the metering valve I 03 in the screw threaded passage I I of the plunger and the low flame adjustment being made by rotating they abutment sleeve 92.

In Figure 15 I have shown a, construction for directly connecting the plunger to' the expansible member 40, somewhat similar to that shown in Figure 9 except that the ball carrying member corresponding to member 'I8 to `Figure 9 is externally screw threaded to take the place of anvils IIJI and |01 of Figures 10 and 13 respectively.

The direct connection of the plunger to thel expansible fluid operated member 40 is highly desirable, and for this reason the constructionsshown in Figures s, 6, 1o and Y13, ln all of which the plunger is actuated in one direction by a spring, are not preferred. The elimination of the spring against which the expansible member must work when expanding, has been found to result in a more sensitive operation of the valve, enabling closer temperature regulation. Further, when a spring is used, the amount of expansible fluid in the element 55 `and member l0 varies with the tension of the spring against which the memberv 40 mustexpand, thus ref quiring `matching of the spring and the expansible fluid in the thermostat which is very objectionable from the manufacturing standpoint and altogether eliminated in my preferred direct connected plunger constructions.

IIt will be evident that as a result of my invention itis possible for the first time to provide automatic temperature governed fuel control for oil burning refrigerators in which it has been hitherto necessary to use manual fuel control.

Attention. is vfurther directed to .the fact' that `this new result is obtained while enabling the` burner to operate effectively at all temperatures lwhlleobtaining' certain of the improved results set forth in my vcopending applications and `without irregularities in theviiame such as would illustrative purposes and that the invention may be modied and embodied in other forms without departing from its spiritor the scopev of the appended claims.

What 4I claim as new and desire to secure by v for operating said valve member, and manually operative valve means disposed longitudinally of said casing having a control portion inside said casing also controlling Ithe amount of fuel which can besupplied through said transverse supply passage, said valve member and valve means each having adjusting means extending above the exposed upper end of said lcasing and adjustable following insertion of the latter in said socket.

2. In athermostatlcally controlled valve, an axially elongated valve casing insertable longitudinally in a substantially corresponding longitudinal socket and having an exposed upper end, said casing haying a lower fuel inlet and a communicatingtransverse fuel supply passageextending transversely therein, Vtemperature responsive means for controlling, the quantity of fuel supplied through said passage including an expansible iiuid operated member and a movable valve member extending inside said casing and adjustable longitudinally thereof, by said member to control'the effective cross section of said transverse supply passage,said valve memberhaving result from the use of. a drip feed or devices requiring the raising and lowering of the oil supply. Further, as a result of my improved valve constructions, a unitary thermostatically controlled valve structure is provided including the temperature responsive control valve and the high flame metering valve, which is adapted to be substituted for the manually controlled valve furnished withexisting oil burning refrig- It .will also be noted that in various of the improved constructions above described the fuelcontrol valvegis actuated directly by and moved with the expansible member during ex'- pansion and contraction of the, latter, increasing the supply of fuel to the burner as the ex' pansible member expands. It will y,also be evident that in certain forms of my improved constructionI have provided such a unitary valve structure inwhich the metering4 and temperature controlled valves are concentric and which is adapted to ,-bey manufactured quickly and cheaply by well known automatic screw machine improved construction will, however, be apparent to those skilled in the art.

Thesefand other4 advantages of my` means adjustable from the upper yexposed end of said casing for limiting the movement of said movable valve member in one direction whereby to maintain `a minimum fuel supplythrough said transverse passage, and a metering valve `dis posed longitudinally of said casing having a control portion within said casing and also having a portion outside said casing adjustable from said end of said casing for adjusting said control portion to limit the quantity of fluidwhich can be i supplied through said supply passage.

3. In a thermostatically controlled valve, `an axially elongated casing insertable longitudinally in a substantially corresponding longitudinal socket andA having anexposed upper end, said casing having a lower -fuel inlet and a. communieating transverse fuel supply passage extending transversely therein, temperature responsive means at one end of said casing for controllingl the quantity of fuel supplied through said passage including an expansible uid operated member and a plunger operated'by said member and intersecting said transvilrse supply passage and having a reduced portion adjacent its'lower end forming a shoulder onsaid plunger above the lower end ofsaid plunger adapted to be moved across said transverse supply 4passage to vary the effective cross sectional area thereof, and means disposed above the exposed upper end of. said casing and adjustable following insertion of said l, casing in said socket for, limiting the-amount of While I have "minis application specifically described several embodiments of my invention,l it will be understood that these are shown for fuel supplied through said passage, and means likewise projecting -above the upper end of said casing and independently .adjustable relative to said plunger for insuring a minimum orifice in said supply passage.

4. In-a thermostatically controlled valve, an

tudinally in a substantially corresponding longitudinal socket and having an exposed upper end,

said casing having a lower fuel inlet and a communicating transverse fuel supply passage extending transversely therein, temperature responsive means for controlling` the quantity of fuel supplied through said passage including an expansible uid operated member and a valve plunger extending inside said casing and adjustable longitudinally thereof and having a controlling portion inside said casingadapted to be brought into and out of register with said supply passage in response to movements of said plunger, and an axial sleeve adjustably carried by the exposed upper end of said casing through which said plunger is movable and located be- .tween the upper end of said casing and said expansible uid operated member and engageable with sai'd plunger for limiting the movement of said plunger in one direction whereby to maintainra minimum'uid flow through said communicating passages.

5. In combination, a constant level fuel chamber having a vertically elongated socket, valve mechanism for controlling the ow therefrom including an axially elongated valve casing insertable longitudinally into said socket with its lower end inluid communication with said chamber below the level of fuel therein and its upper end projecting -above the top of said chamber, said mechanism having an axial inlet passage, an outlet passage and an intermediate transverse fuel supply es. e all located below said level, temperature responsive means for controlling the supply of fuelthrough said supply passage including an expansible :duid operated member locatedl above theupper end of said `valve casing and a valve member movable therewith and extending inside said casing to vary the eil'ective cross-section of said supply passage, 'manually operable valve means having a control portion inside said casing for limiting the amount of fuel which can be supplied through said supply passage, means on the upper projecting end of said valve casing for effecting axial adjustment of said valve member, and means also accessible from the exposed upper end of said valve casing for adjusting Vsaid valve means while said mechanism remains in said chamber. v

6. In a thermostatically controlled valve, an

i axially elongated valve casing inserta-ble longi- -municating transverse fuel supply passage and a plunger passage` intersecting said transverse supply passage, a valve plunger in said plunger paslaxially elongated valve casing insertable longiplurmer and also accessible for adjustment at theexposed upper end of said valve casing following insertion of the latter in the socket.

7. In a thermostatically controlled valve, an axially elongated valve casing insertablevlongitudinally in a substantially corresponding longitudinal socket and having an exposed upper end, said casing having an axial fuel inlet and a communicating transversely extending supply passage at one end thereof, two control passages located alongside each other in said casing and both intersecting said supply passage, a manually adjustable metering valve in one of said control passages projecting above the upper exposed end of said casing and at its other end controlling said supply passage, and an expansible fluid actuated valve member in the other controlpassage having a portion movable acrosssaid supply passage to govern the effective cross-section thereof in response .to temperature changes affecting said expansible fluid.

8. In a thermostatically controlled valve, an

axially elongated valve 'casing insertable longi tudinally in a vsubstantially corresponding longitudinal socket and having an exposed upper end, said casing having `an axial fuel inlet and a communicating transversely extending supply passage at one end thereof, two control passages located along-side each other infsaid casing and both intersecting said supply passage, a manually adjustable metering valve in one of said control passages having its lower end movable into said supply passage and having its upper end projecting above the exposed upper end of said valve casing, and an expansible fluid actuated valve member inthe other control passage having a portion movable across'said supply passage to vgovern the eil'ective cross-section, thereof in response to temperature changes affecting said expansible fluid, and means located at the upper ex municating transversely. extending supply passage therein adjacent its lower end, a plunger passage intersecting said supply passage, a plunger reciprocable in said plunger passage having a portion movable across said supply passage to control the effective cross-section thereof, an exsage having anl annular ygroove intermediate its ends, -an expansible fluid actuated memberlocated above and actuating said plunger to bring its groove into and out of register with said transverse passage in said casing, adjustable means located on the'exposed upper end of said casing El; a metering valve located in said pansible uid .operated member acting on the upper end of said plunger having a supporting frame, a manually adjustable metering valve also controlling the cross section of said transverse supply passage and disposed inparallel relation to said plungenand .projecting above the exposed upper end of said valve casing, and a rigid support for said frame carried by the exposed upper end of said valve casing and having an axial pas. sage' therethrough into which said plunger and metering valve project.

10. In a thermostatically controlled valve, un

axially elongated valve casing insertable longitudinally in a substantially corresponding longiing the effective length of said plunger, a manually adjustable metering valve also controlling the cross section of said supply passage and disposed in parallel relation to said plunger and 'projecting above the exposed upper end of said valve casing,

land a rigid support for said frame surrounding said plunger and metering valve and lcarried by said valve casing and having a portion cut away between said valve casing and supporting frame Yto permit access to the upper end of said metering valve and, to said adjustable means.

11. In a thermostatically controlled valve, an axially elongated valve casing insertable longitudinally 'in a substantially corresponding longitudinal socket and having an exposed upper end, said casing having an axial fuel inlet and a communicating transverse supply passage therein adjacent its lower end, a plunger passage inter secting said supply passage, a plunger reciprocable in said plunger passage having a portion movable across said supply passage to control the effective cross section thereof, an expansible fluid operated member acting on said plunger having a supporting frame located above said plunger, adjustable means carried by the exposed upper end of said valve casing and concentric with said plunger for limiting the extent of movement of the latter in one direction. and a rigid support for sive meansV for controlling the supply of fuel through said passage including an expansible iiuid operated member and a vvalve member movable therewith to control said passage, and a metering valve within said valve member also controlling the supply of fuel through said supply passage.

15. In a thermostatically controlled'valve having a fuel supply passage therethrough, temperature responsive means for controlling the supply lof fuel through said passage including an-expansible fluid operated membery and a plunger movable with said member to vary the effective cross-sectional area of said passage, and a metering valve including a manually adjustable valve i member within and coaxial with saidplunger also said frame carried by said valve casing and surrounding said plunger and adjustable means and having a portion cut away to permit access to said adjustable means.

12. In a thermostatically controlled valve, an elongated'valve casing having a supply passage therein adjacent its lower end, a plunger passage intersecting said supply passage, a plunger reframe, adjustable means located between said frame and said valve casing for varying the eifective length of said plunger, a metering valve also controlling the cross-section of said supply passage, and a rigid support surrounding said plunger and connecting said frame and valve casing having an intermediate portion cut away to permit access to said metering valve and said adjustable means. v

13.'In a thermostatically controlled valve, a valve casing having a transverse fuel supply passage therein, a plunger passage intersecting said supply passage, a valve plunger movable in said plunger passage having a portion adjacent its lower end controlling the effective cross section of said supply passage, low name adjusting meanscoaxial ,with said plunger and extending above the latter for limiting the upward movement of said plunger and maintaining a minimum orifice in said supply passage, and expansible iiuid ac tuated means supported above said plunger for moving said plunger away from said low flame adjusting means to increasethe cross section of said supply passage in response to increases in temperature affecting said iluid.

14. In a thermostatically controlled valve having a. fue! supply passage, temperature responadjustable to vary the supplyA of fuel through said supply passage.

16. In a thermostatically controlled valve having a fuel supply passage therethrough, temperature responsive vmeans for controlling the supply of fuel through said passage including an' expansible fluid operated member and a plunger reclprocated by and movable in the same direction with said member to vary the effective cross section of said passage, said plunger having a vertical passage and a horizintal passage communicating with said supply passage, and means coaxial with said plunger and extending into said Vvertical plunger passage for limiting the amount of fuel supplied through said passage.

17. In a thermostatically controlled valve, a valve casing having a lateral oil supply passage and a plunger passage extending transverselyA of said supply passage, temperature responsivemeans controlling said supply passage including an expansible fluid operated member and a plunger reciprocable in said plunger passage in response to expansion and contraction of said member and having fluid passage means therein adapted to be brought into register with said supply passage to control the fluid supplied there through, and a manually adjustable needle valve carried by said plunger and controlling the cross section of said fluid passage means.

18. In a thermostatically controlled valve, a valve casing having alateral oil supply passage and a plunger passage extending transversely of said supply passage, temperature responsive means controlling said supply passage including an expansible fluid operated member and a plunger reciprocable in said plunger passage in response to expansion and contraction of said member and having uid passage means therein adapted to be brought into register with said supply passage to control the fluid supplied therethrough, -a needle valve carried by said plunger and` vertically reciprocable relative thereto to vary the cross section of said fluid passage means, cam means for reciprocating said needle valve,` and manually operable means external of -said plunger for actuating said Vcam means.

19. In a thermostatically controlled valve, a

valve casing having a transverse oil supply passage and a vertical plunger passage extending transversely of the same, temperature responsive means controlling saidsupply passage including an expansible fluid operated member and a plunger reciprocable in said plunger passage hav- 'ing communicating vertical and transverse passages, the latter adapted to be brought into register with said supply passage to control the fluid flow through. the latter, a needle valve adjustable cross section of said passage, and means for ad. justing said needle valve including an operating member located transversely of said plunger above saidneedle valve and having cam means within the vertical plunger passage acting on said needle valve.

20. In a thermostatically controlled valve, a valve casing having a transverse oil supply passage and a vertical plunger passage extending transversely of the same, temperature responsive means controlling said supply passage including an expansible iluid operated' member and a plunger reciprooable in said plunger passage having communicating vertical and transverse passages, the latter adapted to be brought into l.register with said supply passage to control the fluid flow through the latter, a needle valve ad-l

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