Патент USA US2269016код для вставки
Jan. s, 1942. w; H.' @ME 2,269,016 MAGNETIC VALVE Filed Nov. 13, 1939 áfhwmtor Willis H. Gun ‘Ottomgg Patented Jaa 6, 1942Y 2,269,016A UNITED STATES PATENT ori-‘ICE 2,269,016 . MAGNETIC VALVE Willis H. Gille, St. Paul, Minn., assigner to Minne apolis-Honeywell Regulator Company, Minne apolis, Minn.,l a corporation of Delaware Application November 13, 1939, Serial No. 304,093 10 Claims. (Ci. 236-75) My invention relates to improvements in auto upon adisc 34 having a flanged opening through matic control and operation of electric valves and has more particularly as its object to provide means embodied in magnetic valves to prevent them from sticking in open position due to re -siclual magnetism continuing to attract the core or armature after the valve has been deen' ergized. t ' . its central portion, the disc 34>serving to space or separate the coils I6 and 35. As will be de scribed later in the specification, the coil I6 is a lift'coil for- purposes of opening thevalve and the coil 35 is a drop-out coil the purpose of which is to cause positive closure ofthe valve to insure against sticking of the valve in open Another object of my invention is to providej position. a magnetic valve having a lift winding and 10 Extending within the coils is a sleeve I9 of a drop-out -winding in combination with a con suitable non-magneticfmaterial such as brass. trol arrangement whereby the drop-out coil is Secured within the upper end of the sleeve i9 shunted for opening the valve. is a sleeve Ztl-which is also of non-magnetic ma -Another' object is to provide a magnetic valve terial preferably having good electrical conduc having series connected lift and drop-out Wind 15 tivity such as copper. The sleeve ,20 is secured ings of such- relative magnetic effect that the to the sleeve I3 by any suitable means to insure valve is opened'by the lift winding whenever a fluid tight joint. Extending through the sleeve the drop-out winding is shunted and the valve 2li is a pin 2| which is of magnetic material. is closed whenever the shunt is. interrupted to This pin terminates in a head 22 which head cause current to flow in series' through the coils. 20 is provided with a conical extremity '23. Another object is to provide a magnetic valve A core or plunger of magnetic material 24 is having lift and drop-out windings connected in loosely mounted within the sleeve I9 and is de series and afmanual opening device for power . signed to be actuated in response toenergization failure operation including recycling contacts for and deenergization of the coils I6 and 35 as will shunting the drop-out winding, the manual open 25 be presently described. This core is connected to ing device being of a type which latches the the valve’ stem I5 through a lost motion con valve in almost open position, the. valve open nection. This connection is formed by providing ing fully upon resumption of power, releasing the core 24 with an elongated cylindrical passagev the manual device and energizing the two wind 25 in which is slidably located a cylindrical head ings in series to close the valve. 30 26 of valve. stem I5. The lower end of the _ Further objects of the invention will become passage 25 -is closed by means of a plug 2l. apparent from' the following detailed description Mounted upon, this plug is a spring 28, having and annexed drawing. __ \ its opposite _end seated against the head 26. If The single ñgure of the drawing is a cross the valve I4 is stuck to its seat when the solenoid sectional view of my improved valve showing 35 is energized, the spring 28 permits the core 24 diagrammatically the electrical connections for ` automatic control thereof. Referring tol the drawing, a valve body is des ignated by _the reference numeral I0 and com prises an inlet connection II and an outlet con nection I2. The valve body is provided with, _the usual transverse partition I3 which is aper tured to provide a valve seat therein. Coop erating with said valve seat- is a valve |_4 which is rigidly secured to a valve stem I5 by lsuitable to move and gain momentum so that a consid erable amount of kinetic'energy is available to break the valve loose when the spring is finally taken up. It should also be noted that, since 40 the spring 28 holds the head 26 against the core 24 while the valve is open, a hammer action is obtained which insures the firm seating of the valve when it is closed.A _ The upper e'nd ofthe solenoid core 24 is pro vided with a recess having two conical surfaces 28 and 38. The conical surface 30 is adapted to Mounted on the valve body III is a solenoid valve engage the conical surface 23 of pin 2I to limit ,actuating mechanism. the upward movement of the core. The conical The solenoid actuating mechanism comprises surface 23 is adapted to cooperate with a similar coils I6 and 35. The coil 35 is located on a 50 conical 'surface 3| on member 20 inv such a` ilanged disc Il of magnetic material, which disc manner that the core is’ guided into engagement in turn is located upon a relatively thick cir with stop 23. In order tovguard against any means such as by being threaded thereto. cular plate I8. The latter plate I8 is supported dash-'pot action a transverse passage 43 is pro by the valve housing I0 and it is secured thereto vided in the core 24 which passage is in com in fluid tight relation. The coll I8 is mounted 58 munication with a recess in the upper end of the 2 2,269,016 .core. This is necessary because of the pres ence of the fluid within the space between the core and the sleeve 20. In this connection, at tention is called to the fact that thel core is the patent to Cyr mentioned above, the patents of Willis H. Gille No. 2,114,961 -and No. 2,181,423. ' Numeral 49 designates a terminal box formed ' as a part of the upper structure of the valve and loosely mounted within the sleeve I9 so as to which houses a portion ofa manual operating permit fluid to flow around the same. means for the valve. The terminal box 49 is shown partly broken away. The manual operat This is of considerable importance inasmuch as it serves to cool the windings of the coils I6 and 35 to - ing means includes a shaft 50 journalled in a stud prevent excessive heating thereof during pro 5I which'is threaded into the valve body I0. longed operation. Connected to the shaft 50 is a cylindrical mem , On topïof the coil I6 there is located a disc 32 of insulating material. Secured to said disc is a flanged disc 33 of _magnetic material. Also lo cated on said insulating plate is a second plate 31 of magnetic material. ` A circular armature 4I is secured to a switch blade 42 which switch blade carries an electrical contact 36 adapted to coop erate with a stationary contact 43 located upon the- insulating disc 32. The armature 4| serves to complete the magnetic path between magnetic members 33 and 31 upon energization of the coil ber 52 which has secured at its upper end a l knurled knob 53 designed to be manually rotated by the operator. The shaft 50 and the cylindri cal member 52 are secured together by means of a rivet 54, although it is ’to be understood that any other suitable securing means can b_e em , ployed and if desired these two members can be integrally formed. 'I'he cylindrical member. 52 is enlarged at its lower extremity 55. This uenlarged portion 55 is provided with an opening |6. y The plate 31 has three inwardly extending 56 on its underside into which extends one ter ‘minal of a coil spring 51.. The other end of the projections (not shown) adjacent which the armature 4| will be attracted most strongly. This portion of stud 5I. The spring 51 is normally will result in a three-point holding action be spring extends into an opening 58 in the upper ' tween each plate and the armaturewhich will lessen the danger of the armature being held un tensioned so as to tend to move member l52 and the attached shaft 50 upwardly and at the same time to rotate it in a clockwise direction looking evenly so as to cause chattering or Vibration downwardly. As is apparent from the drawing thereof. The details of construction of the mag part of the present invention. The details of construction of these plates are described more the shaft 50 is provided at its lower end with 'a conical shoulder 59 and by reason of the tend -ency of the spring 51 to urge shaft 56 upwardly, this conical head is yieldably urged into engage fully in the patent to Cyr 2,155,358. ' ment with the edge of the opening in the under netic plates 33 and 31 however,v do not form a « ` 1 By reason of the resilience of switch blade 42 to which the armature 4| is attached, the latter member is held in the position indicated in the drawing when the coil I6 is deenergized. The disc |6 is provided with a cylindrical recess l in the interior thereof in which is secured a re side of stud 5|. The shaft 50 has attached at its lower end an arm 6I. Secured-to the arm 6I is a downwardly extending pin 62. This pin 62 is adapted to co operate with a curved surface 63 of a core actu ating member 64. The core actuating member 64 silient spring disc 44. This spring disc is secured is pivotally mounted on a pin 65 through a pair in place by'means of a plurality of rings 45. It will be noted that the inner edge of spring 4_4 is of ears 66 as shown. The member 64 is provided turned upwardly. This upwardly turned portion at one end with‘a'downwardly extending portion which terminates- in a fork 61, the fork straddling is designed to cooperate with a conical shoulder f the valve stem and being vadapted upon turning , of member 64 around pivot 65 in a counter-clock 46 at the lower end of the core 24. It will be noted that' two possible magnetic wise direction to engage the lower end of the core 24. The other end of member 64 consists of a ~ paths are provided for the flow of ñux upon „en ergization of the coil I6. One of these paths is flat strip which is normally'horizontally disposed I ' through the disc |1, the casing 41 which is of v and which terminates in the portion 68 normally magnetic material; the plate 31, the armature 4 I, resting against the end of shaft 56. With the ~ the plate 33 and the core 24. The other of these parts in their normal position the arm 6| is in a ' position where further rotation of shaft 50 in a, counter-clockwise-~direction causes pin 62 to ride on thè curved surface 63. When it is desired to paths is through disc I1, casing 41, plate 31', armature 4I, pin 2| and the core 24. Flux ñow ing through the ñrst mentioned of these two -manually operate 'the valve, for instance when paths is not shaded while the flux flowing through the second mentioned of these two paths is r there is no electrical power available_the shaft 50vis rotated in a counter-clockwise direction by -shaded by reason of the effect of the non-mag means of the knurled knob 53 so that the pin\62 netic conducting sleeve 20 which acts as a shad is caused to engage the curved surface 63 and ing ring.l The result is that the iiux flowing through these two paths is displaced approxi 60 to tilt the member 64 about the pivot 65. 'I'his causes the core 24 to be moved upwardly and the mately 90°. This produces a much _smoother valve to be opened. In this position the pin 62 is action of both the core and the armature 4| and engaging the fiat portion of strap 64, and by rea eliminates much of the vibration which is usually son of the-weight of the core 24 restinggon the present if the device is operated by alternating 65 fork 61 the shaft 50 is held in that position against the action of spring 51, which as previ The spring disc 44 by reason of such engage ously stated, tends to rotate the shaft in a clock ment of its inner turned edge with the shoulder wise direction. The' tendency of the weight of 46 upon energization of the coil I6 serves further the core to hold the shaft 5_0 in position is in `to center the core within the sleeve I9 and at creased by reason of the fact that in order for the same time to yieldably urge the core down wardly so that upon deenergization of the coil the shaft to be rotated back pin 62 must travel current. ' » I6 the spring disc functions as a means for re turning the core to closed position of the valve. f over a circular path a portion of which is closer to pivot 65 than the position occupied by pin 62 ~ when the valve has been manually opened. Since of this portion of my valve reference is made to 75 the pin travels through a horizontal path it is ac For a more complete description and operation 2,269,016 Y 3 cordingly necessary for the pin to press down the coil I8 the magnetic eilect of coil I6 only becomes left hand portion of lever 84 and accordingly appreciable when the coil 85 is shunted out of raise the core `Jstill Iurther in order toázraverse the circuit and thus when I speak of energizing this circular path. The effect is that the pin is the coil I6 for opening the valve I refer to com frictionally held ,at the bottom of an inclined pletion of the circuit therethrough which does surface over which it must travel to return to the normal position. not include the coil 35. . Referring 'to the drawing, numeral 85 desig While the rotation of shaft 50 causes the core 24 to be' raised sufficiently to move the valve to open position the core is not raised as far as it is by reason of energization of coil I8. Accordingly as coil I6V is energized at the time that the shaft À nates a thermostat of conventional type having electrical connections whereby the operation of the valve is normally automatically controlled. 'I'he thermostat 85 comprises a bimetallic element 86 to which are attached contact arms 81 and 83 engageable with ñxed electrical contacts 89 and 90, respectively. Blade 81 and contact 89 are less widely 'spaced than blade 88 and contact 90 so that upon movement of blade 81 in the direction of contact 89 engagement will be effected before the engagement of the blade 88 and contact 90. 'I‘he blades 81 and 88 move towards their respec tive contacts in response to a drop in temperature and blade 88 engages its respective contact at a ‘ 50 is manually moved or if itis subsequently en ergized the frictional engagement of member 54 j with pin 82 will not be present and consequently the spring 51 will be effective to rotate shaft 50 to a position it is in when the valve is closed in zwhich position the member 84 in no way inter feres with the normal function of the valve. Secured to the terminal box 49 are terminals 14 and 16. Secured to the terminal 14 within the terminal box 49 is a contact carrying arm 11. Secured to the terminal 18 also within the ter minal box 49 is a resilient switch blade 18 which carries contact 19 adapted to be> moved into en gagement with a contact.“ by the contact car rying arm 11. The blade 18 is resilient and by temperature which may be 1° or 2° lower for example than the temperature at which blade 88 I engages contact 89. .A step-down transformer 92 supplies power for lthe operation of the valve. This transformer comprises a line voltage primary 93 and a low reason of such resiliency tends to move in a di rection such as to cause engagement of contacts voltage secondary 94. The primary 93 is con nected to line conductors 95 and 96. 19 and 80. , When the valve actuating member is The valve may be employed to regulate the flow of gas or other fuel to a fluid fuel burner to heat a room or other `space. In such case the in its normal position this tendency of blade 18 to etl'ect the engagement of the contacts 19 and 80 is resisted by a stud 82 secured to the member 52 and having attached thereto a circular disc 83 which bears against the switch blade 18. Upon rotation of member 52 to open the valve manual ly disc 83 is rotatedA away from the switch bladeV thermostat 85 is located in the space to be heated. As shown in the drawing the thermostat is in satisfied position, that is the position which it assumes when the temperature of the room is ‘I8 permitting the same to cause engagement of ' above the desired value. Under these conditions the valve is closed and the coils I5 and 35 are contacts 19 and 80. energized through th'e following circuit: from As pointed out above, the coil I6 serves as a lift or opening coil and the coil 35 acts as a` drop out coil toinsure closure of the valve when itis de secondary 94 through wire |00, wire |0I, wire |02, coil 35, wire I 03, wire |04, coil I6 and wire |05 back to secondary 94. Upo'n the temperature Afalling the bimetallic element 80 will cause bladel sired that it should close.- As will be\ presently pointed out, when the electrical connections are 81 to move to the left into engagement with con traced coils I6 and 35 are normally connected in series with a source of power when the valve is in closed position. The combined resistance of the two coils is such that when they are in series there is only a very small and negligible con sumption of power. 'I'he current flow when the two coils _are in series is of course very low._ The coil 85 however has a greater number of turns of wire than the coil I4 has and the wire of coil 35 has greater resistance> than that of coil I8. 'I‘hus when the two coils are energized in sex-les coil 35 has a greater number of ampere turns than does coil I8 and as a result themagnetic effect of coil 35 preponderates over that r'of coil I8. Thus whenever the valve is in a closed position the coil tact "89. The engagement of these elements how ever does not establish any circuit but if the A temperature continues to fall blade 88 will engage contact 90 whereby the following circuit is com pleted shunting the coil 35 and connecting coil I5 directly across the source of power‘. from sec ondary 94 through wire |00, wire |0I, wire |85, contact 89, blades 81 and 88 of thermostat 85, contact 90, wire |01, wire |08, wire |09, wire |84, coil I8 and wire |05 >back to secondary 94. This circuit will, as pointed out above, increase the magnetic effect of coil I6 to such an extent that almost immediately the armature 4| will be drawn down in the direction of engagement with mag- ` 35 tends to maintain itclosed, the magnetic cen- ' ter of the core 24 being in such a position with respect to the field of coil 35 that the field of coil 35 will `normally urge the core 24 downwardly. 'I‘he path of iiux of the coil 35 as can be seen is through the disc I1, casing 41, disc 34, and core 24. ' . In order to ,open the valve the electrical con nections are changed so as to shunt the coil 35 and connect the coil I8 directly across the power source. By thus removing the resistance of coil 35 from the circuit through the coil I8 there is a )7 considerably greater flow of current through thev netic members 33 and 31 and causing the switch blade 42 to‘bring contact 35 into engagement with contact 43. Upon this taking place the fol lowing holding circuit for coil I6 is established: from secondary 94 through wire |00, wire III, wire |06, contact 89, blade 81, bimetallic element 85, wire IIO, contacts 43 and 36, blade 42, wire |||, wire |09, wire |04, coil I6, and Wire |05 back to secondary 94. It will be noted that this hold ing circuit 1s independent of the engagement of blade 88 and contact 9u so that 1f the temperature should rise very shghtly so as to cause disen coil I8 so as to4 substantially increase its mag gagement of blade 88 and contact 90, the solenoid coil I5 would not be deenergized because of the 'netic eilect. While it is to be seen that there is continuance of the maintaining circuit. Com valways rat least a small current flowing through-u pletion of the circuits just described shunting the 4 2,269,016 coil 35 of ‘course causesthe magnetic effect of coil 35 to be terminated. Upon the energization of coil I6, core 24 will ` be moved upwardly and will cause the spring 28 'energizing circuitfor coil I6 which does not ex tend through the coil 35, that is a shunt circuit for coil‘35. This circuit is as follows: from sec ondary 94 through wire I88,wire I I3,blade'I8,con- to be compressed between the plug 2l and the 5 tacts 'I9 and 80, contact arm TI, wire I I4, wire I 08, head 28 of the valve stem I5. After a short period wire I09,wire I04,coil I5,and wire Iûâback to sec of time, this action will raise the valve from its ondary 94. Since as previously stated the valve seat.` Due to the fact that the core is» allowed to has been opened when there is no power avail travel a considerable distance before the' spring 28 is compressed enough to cause movement of the valve stem, the kinetic energy of the moving core will be effective to move the valve from its seat in the event it is stuck thereto. 'I'he core 24 will continue to move upwardly until the conical able, this circuit will not be eñ‘ective to energize coil I6 until the power is restored. As soon as power returns however, coil I6 will be energized causing core 24 to be lifted to its uppermost po sition and as previously explained pin 62 will be released' to permit the shaft 50 to rotate to its surface 30 engages'the head of the pin 2|. In original position. As soon as the manual op this position of the core the shoulder» 46 will erator is thus released contacts 'I9 and 80 will be engage the inturned edge of spring disc 44 in again separated and the circuit last described such a manner that the spring 44 will exert a through the coil I6 will be interrupted, vthat is, slight tension on the core tending to pull it away the shunt circuit will be interrupted and the coils from engagement with surface 23. As long as 20 will again be energized in series. ‘ This will cause the coil I6 is energized this tendency is resisted immediate closurev of the valve in the manner by the holding action of the core but as previous-_ i previously described. In this position the parts ly indicated is eiîective to cause downward move are as shown in the drawing and the manual op ment of the core upon deenergization of the coil erator 'is in no way interfering with the control ` I6. As previously indicated, the flux which is of the coils. If at the time the power is restored eiïective on the core ñows through twopaths, 25 the temperature is such that blades 81 and 88 one of which is shaded and the-other of which ' are in engagement. with contacts 89 and 90, coil is-not. In this manner, a more uniform holding . I6 will remain energized through the circuits al action isA secured and chattering is avoided. ready described and the valve will remain open. When the temperature rises suñiciently so that` 30 Thus it will be seen. that no matter what posi blades 8l and 88 disengage from contacts 89 tion the thermostat is in when power returns, if and 98, the coil I6 will be deenergized, that is', the valve has been manually opened the parts the shunt circuit around coil 35 will be inter will immediately return to position for automatic rupted and due to the combined effects of gravity, control. the spring disc 44 and the magnetic effect of coil 35 ,From the foregoing it will be apparent to those 35, the core 24 and valve I4 will be moved down skilled in the art that I have provided a novel wardly together so 'as to cause the valve I4 to improvement in the operation and control of ' be firmly seated. -It will be seen therefore that as soon as the- shunt circuit is interrupted the magnetic valves whereby the diiiiculty of such valves sticking in vopen position- _is positively two coils I5 and 35 are again energized in series. 40 Under these conditions, as pointed -out above, the magnetic eiïect of coil I6 is negligible, the mag netic eiîect of coil 35 preponderating and posi-tively urging the core 24 downwardly to insure that the valve closes and does notv stick in open position. The magnetic effect of coil 35 tends 44:45 to neutralize and overbalance the slight magnetic eiîect of coil I6 when the coils are energized in series. It willl be seen therefore that I have provided al compact- coil arrangement which pro 50 eliminated. The additional coil is very compact vides positive insurance against the valves stick ing in open position and yet does not require that a pair of contacts be-made to Complete a circuit when it is desired that the valve be closed. and the manner of its control is such that a pre ferred type of thermostat >may be used and the use of additional switching or other equipment is made unnecessary. ' While I have shown a specific embodiment of my invention it will be understood that this is for purposes of illustration only and that my in vention is to be limited only by the scope of the appended claims. I claim as my invention: ’ _ 1. In a magnetically operated valve, in com bination, a pull in coil and a drop out coil` con nected in series, control means comprising elec trical connections for shunting the drop out coil , If for any reason there is a power failure as is 55 to increase the energization of the pull in coil` often the case and it is desired to open the valve manually knurled knob 53 is rotated so as to cause rotation of shaft 58 and rotation of pin 62 on to the curved surface 63 on to the lever 64. for opening the valve, said coils having such rela tive magnetic effect that when connected'iny se ries the drop out coil operates the valve to closed position, said control means including a thermo As previously explained, this causes upward 60 stat having contacts which close at a predeter movement of the right-hand end of lever 64 mined temperature whereby a circuit is pro causing the core to be moved upwardly so that duced through said electrical connections shunt the valve is` opened. Due to the fact that in its ing said drop out coil, and manually operable valve open position pin 62 is resting on a nat v'means for releasably latching said valve in a po portion of lever 64 and the weight of the core is 65 sition near full open >when power fails, said last resting upon the right-hand end of lever 64, the means including -contacts which are closed and pin 62 will be held frictionally on the lever against which complete a shunt circuit around said drop the action of the spring 51 which tends to return out coil when> said valve is latched in said posi j the same to the normal inoperative position. tion, whereby when~ power is resumed said pull in The rotation of knurled knob 53 and shaft V5l! 70 coil is energized opening said valve wide open, in a.> manner to open the valve causes the disc 83 to be rotated away from engagement` with the resilient switch blade' ‘I8 so as to allow engage ment of contacts 'I9 and 80. vEngagement of' said »manually operable means releasing whereby said shunt circuit is interrupted causing closure of the valve. ' y ' ' 2. In a magnetically voperated device, in com _ these contacts results in the establishment of an 75 bination,y an armature operatively connected to 2,269,016 ' said device, a pair of coils having unequal and 5 ing said armature, stop means of magnetic ma terial for engaging said armature when said device is moved to its active position, one of said coils having a greater number of turns than opposing magnetic fields for operating said arma ture, a source of energy, means connecting said coils in series to said source so that the coil having the stronger field determines the arma ture position, means responsive to a condition in dicative of the need for operation of "said device, a pair oi switches sequentially closable by said con the other and positioned with respect to said armature so as to operate it in the direction of said safe position, said other coil being posi tioned so as to operate said armature in the direc dition responsive means upon a unidirectional tion of said active position, a source of energy, change in said condition, a first circuit for shunt 10 a single circuit for causing operation of said de ing said stronger coil so that the coil having the vice to safe position, said circuit connecting said weaker field determines the amature position, said first circuit including both said switches in series, a third switch operable upon increased energization of said weaker coil due to shunting of said stronger coil, and a second circuit for shunting said stronger coil including the first of coils in Iseries to said source so that said one coil controls the armature, a circuit for causing operation of said device to active position includ lus ing a connection for shunting said one coil so that said other coil controls the armature, and , switch means in said connection for selectivelyl said pair of switches to close and said third switch controlling the now of current in said circuits. in series. 6. In combination, a valve mounted for move 3. In a magnetically operated device, in com 20 ment in a substantially vertical direction, a stem bination, an armature> operatively connected to attached to said valve _for _operating it between said device, a pair of coils having unequal and ' an upward open position and a downward closed opposing magnetic fields for operating said arma position, an armature mechanically connected to ture, a source of energy, means connecting said said stem, and operable between an upward po coils in series to said source so that the coil> 25 sition corresponding to open position of said valve having the stronger field determines the arma and a downward position corresponding to closed ture position, means responsive to a condition in position of said valve, a pair of coils for operat dicative of the need for operation of said device, ing said armature, one oi’ said coils having a * a -pair of switches sequentially closable by saidgreater number of turns than the other and posi condition responsive means upon a unidirectional 30 tioned with respect to said armature `so as to change in said condition, a first circuit for shunt operate _it in valve closing direction, said other ing said stronger coil so that the coil having the -coil being positioned so as to operate said arma weaker field determines the armature position, ture in valve opening direction, stop means of said first circuit including both said switches in magnetic material for limiting movement‘of said series, a third switch operable upon increased 35 armature in valve opening direction, a source of energizatìon of said weaker coil due to shunting energy, a single circuit connecting both said coils of said stronger coil, a second circuit for `shunt in series with said source so that said one coil ing saids stronger coil including the first to close operates said valve to closed position, and a con of said pair oi switches and said third switch in nection including switch means for shunting said l series, a »fourth switch, means manually operable 40 one coil so that said other coil controls the arma to close said switch and simultaneously move said ture and thereby operates said valve to open posi armature to an intermediate position when said tion, said switch means being operable to open c_oils are deenergized, latch means for holding and close said connection and thereby cause clo said switch in closed position, connections be sure and opening, respectively, of said valve. tween said armature and said latch means for ,45. '7. In a valve operable between open and closed tripping said latch means when said armature is positions, in combination, an armature operative moved to said second position, and a third circuit i for shunting said stronger coil including said fourth switch. . ly connected to said valve, a pair of coils for op erating said armature, one of said coils having a greater number of turnsthan the other, said 4. A thermostatically controlled valve, com 50 one coil being positioned so as to operate said prising in combination, an armature operatively armature to close said valve, said other coil be connected to said valve, a pair of coils having ing positioned so as to operate said armature to ' unequal and opposing magnetic fields for operat open said valve, a source of electrical energy, a ing said amature, means connecting said coils circuit connecting said coils and said source in in series so that the coil having the stronger 55 series so that thesame current iiows through , field holds the armature in a position such as to both coils, thereby causing said one coil to pre maintain the valve closed, means responsive to a dominate over said other coil and close said valve, condition indicative of the need for operation of and a connection shunting said one coil including said valve, a pair of switches sequentially closable switch means, said connection when completed> by said condition responsive means upon unidirec 60 eiîectively deenergizing said one coil so that said tional change in said condition, a first connection ‘other coil opens said valve, said switch means for short-circuiting said stronger coil so that the being operable by opening and closure thereof to coilhaving the weaker field becomes effective to vselectively control the operation of said valve move the valve toward open position, saidv first to closed and open positions, respectively. connection including both said switches in series, 65 8. Ina valve operable between open and closed a third switch closable in response to increased positions, in combination, an armature operative energlzation of said weaker coil due to short ly connected to said valve and biased to a posi circuiting of said stronger coil, and a second con tion in which said valve is closed, a pair of coils nection for short-circuiting said stronger coil in ior operating said armature, one of said coils cluding the first to close of said pair of switches having a greater magnetic eiîect than the other, and said third switch in series. ‘ ` 5. In a devicev magnetically operable between a first safe position and a second active position, in combination, an armature operatively con nected to said device, a pair of coils for operat said one coil being positioned so as to operate said armature to close said valve, said other coil being positioned so as to operate said armature to open said valve, a source of electrical energy, ' a circuit connecting said coils and said source in 6 2,269,016 series so that the same current flows through both thermostat calls for discontinuance of said coils, thereby causing said one coil to predomi Supply- nate over said other coil and close said valve, _. i anda> connection shunting said one coil including switch means, said connection when completed « - -10. In a magnetically operated valve, a first winding, a second winding, armature means as sociated with said windings and connected to said valve for operating said valve between open effectively deenergizing said one coil so that said and closed positions, said armature means having other‘coil opens said valve, said switch means be its magnetic center so arranged with respect to ing operable by opening and closure thereof to said windings that the effect of said ñrst winding selectively control the operation of said valve :to closed and open positions, respectively. 10 urges said armature means in opening direction 9. In a magnetically operated valve for con of the valve and the effect of said second winding urges said armature means in closing direction trolling a supply of heating ñuid, in combination, of the valve, means for energizing both windings, an armature for actuating the valve, a pull in coil « means for connecting said windings in series, said and a drop out coil operatively associated with said armature and connected in series, control 15 windings having such relative magnetic strength means comprising an electrical connection for that the effect of said second _winding prepon shunting the drop out coil toincrease the ener derates when said windingsl are connected in se gization of the pull in coil for opening the valve, ries, and an electrical connection including said coils having such relative magnetic eiîect switch means for shunting said second` Winding, that when connected in series the drop out coil 20 said switch means operating when closed to com operates the valve to 'closed position, said con plete said connection and thereby render said trol means including thermostatic means mov- > - first winding eiîective, to open said valve, said able in response to a condition indicative of the switch means operating 'when opened to break necessity for supplying said heating iluid, and said connection, thereby connecting said wind switch means in said connection and controlled 25 ings in series and rendering said second winding by said thermostat so as to complete said »con effective to close said valve. nection when said thermostat calls Afor a supply _ of fluidand to open said connection when said WILLIS H. GILLE.