US2408280A - Apparatus for refacing gate valves - Google Patents

Description

l Sept. 24, 1946. P. E. wlLCOX APPARATUS FOR BEFACING GATE VALVES Filed Dec. l.- 1944 3 Sheets-Sheet 2 INVESTOR Pw'p Walaox ATTORNEY -s.pt.24, 1946. 'F.-EWILCQX 2,408,280

APPARATUS FOR REFACING GATE VALVES Filed Dec. l, 1944 l 3 Sheets-Sheet 5 l 25VJ l .151! I J5 JQ. l *'26 jg! J0 f /QLZ/l y] Al 412/ .i v

- 217 l lv l l l @2Q l. v- 89 INVENTOR 9i PlzzlzlpE. Wicox ATTORNEY J yPatented Sept. 24, 1946 APPARATUS FOR REFACING GATE VALVES Philipe. Wilcox, New York, N. Y., assignor to The Leavitt MachineCompany, Orange, Mass., a corporation of MassachusettsA Y y Y Application December 1, 1944, Serial No. 566,167 Y i degree. and more particularly such arrangement wherein the facing ofloperation can be reffected without removing the valve. v y

"For the attainment of these objects and such other objects as may hereinafter be pointed out Ihave illustrated an :embodiment of the inven- I tion in the drawings wherein: i

' Fig. 1 is a vertical section through the refacing mechanism in operativeV relation to the gate valve; Y f

Fig.v 2 is a? horizontal` section.` taken on line 2*-2 of .Fig. 1 looking. in the .direction of the arrows;l

Fig. 3y isasection taken on line 3,-3 jor' Fig. 4 is a View of a detail. My invention has been. developed for the purpose ofgrinding the seats of a gatevalve. To facilitate the understanding vof my` apparatus and lthe manner of operation, I show in Fig. 1, in dot and dash lines, the outline of a typical gate valve with the bonnet removed, to uncover and'expose its top surface B. The opposed seats marked D and D are at the lower end of the valve :body C. This type of valve is characterizedin' that these valve lseats are presented at theA same angle to the vertical and at an angle to each other, as shown in this figure. My in- -vention contemplatesv that the seats D and D' be faced off without requiring removal'of the valve. To this end, the apparatus of the disclosed embodiment has'be'en devised so that it vcan be seated directly onthetop surface B of vthevalve casing so that the refacing operation requires only the removal of the bonnet which. seats onv this top surface to;c1ose the casing.I

.If-Upon viewingv Fig.V 3 of the jdrawings' it will be observed that theY baseorbed plate of this apparatus is shown at -Ia-#It seats directly on the top surface B of the valve casing C which therefore functions as the sole surface rof reference for the apparatus. The underface l,of the base is padded for limited areasA as shown at vI I' in Figures 1 and 3 and these areas are groundvaccurately tofassure a jclose titi-between ra correspondingly' transversely elongated through which engages a loc-king member I I6 -headed at one end and threaded at the other Yvalve s'urfacegBA which are incontact therewith.

This base plate is comprised of four wallsor sides `to denne anr open rectangular frame to receive therewithin the operative parts which are Vrentered into the valve casing. Rails or gibs II and I2 are mounted upon opposed sides of bed plate I0 and are shown as secured thereto as follows: A' dowel pin I5 extends upwardly centrally from one of these opposed walls (see Fig. `2)v to engage into an opening centrally of the rail I I. This dowel pin I5 serves to initially assemble and locate rail I I with and on that side or wall. Rail II is locked against movement in any preferred or desired manner.\Two such screws I3 are shown in Fig. 2, one to each side of the dowel pin I5. These elements I3 and I5 retain the-rail II associatedv as shown atthe lower end of this figure. Y

The rail I2 issecured on the opposite ywall or side ofthe bed plate IU by means which permit These securing means comprise per surface of irail I2, into each of which opens slot I4' to Vengage base III'by being threaded thereinto. This construction is shown in detail as to one of the securing members, centrally at the eX- treme right of Fig. '3. Three such members are shown in the illustrated embodiment (see Fig. 2). ,As a result of this arrangement, the rail I2 rcan be adjusted toward and from rail I I when screws I6 are loosened, and then locked in adjusted position by tightening screws I6 which are countersunk in depressions I4 of rail I2.

The rails I`I and I2 have their inner faces inclined or undercut as shown at II' and I2' in FigpB for purposes that will be pointed'out shortly. It will be observed from the showing Fig.r 3 that these rails'rII and I2 are narrower than the Walls or sides of the base I0 upon which they are' mounted and that they overlie the outer portions Aoi these walls and do not overlie the AFigures 1 and 2.. This main housing comprises a base 20 (see Fig. V3) and walls 2|, 22 and 23 which extend' outwardly therefrom and .denne 3 a casing with an open side which is closed by the separable wall member 24 detachably secured thereto to form the fourth wall of and complete the main housing structure. This closure wall 24 may be secured in position in any preferred or desired manner. I show threaded members 25 (see Fig. 2) passed through the wall 24 and threaded into the end faces "of opposed 'walls 2l and 23; The base 28 is mounted yupon a frame which I will hereafter identify as the slide frame for reasons that will shortly appear. frame is comprised of opposed pairs of walls 261 and 262 (see Fig. 3) and 263 'and 264 (see Figures 1 and 2). Upon reference toFig. r3 `it will be 'ob served that the base 26 of the main fhousing .f: is located on the slide frame by dowel pins '21- which extend upwardly fro-rn opposed walls- 261 and 262 and engage in depressions 'in Ythe 'underface of base 26. The drawings show one -dowel pin centrally of the length of each of these two walls 261 and 262 of the slide `frame. (See Fig.

V13)" The two dowel Vpins serve to fix the lposition of the main housing on the slide frame. Means are provided for securing the vmain housing against movement relatively-to or separation from the slide frame. In Fig. y3 I have illustrated these means as pairs of bolts 28 along opposed `sides vof the base 26 to each side of dowel pins -21 and received throughA openings in the base to each side of vdofwel pins 21 and engaged into the slide frame. lThe slide frame has the lower portionof the i-nnerpfaces of opposed side walls 261 andn262 (see Fig. 3) inclined outwardly as vshown at -28vhto engage beneath the inclined faces ll' `and I2 ^of the guide rails ll and I2. As a result of this arrangement the main housing xed to the slide frame as explained, .is mounted on the *bed plate for jsliding Aadjustment thereon to the right or to the left in the showing 'of Figures l and-2. Y y

will `new describe one arrangement whereby the main housing canbe adjusted on the bed- 'plate to and held impredetermined position. The bpedplate Illhas a nar-ige -3E).extendingupwardly along one edge of the walls thereof. rlhis .flange is enlarged vertically centrally thereofas shown at 130' in `2. An adjusting `-member 3tlg threaded through this `central enlargement 36. Secured to its outer end is the operating handle 32 rotation -of which -w-ill advance or retreat the adjusting member 3l which is secured at its inner end to wall 263 of the slide `frame (see Fig. 3), which is held engaged therewith lbetween the 'shoulder left by the reduced thickness of the innermost portion -of member 3| and washer 34 secured at the extreme inner end o f 3l. From thedescription thus far sg-iven it will `be unders-tood that rota-tion of the handle 32 -will adjust the position of lthe slide frame to the right or to the left in the showing in Fig. 1 and in so doing will correspondingly adjust the positionof the main housing carried thereby land of the facing ol apparatus carried by the main housing and which I will now proceed to describe.

fA hanger fork is received within and supported by the Vmain housing already described. It is comprised of two parallel velongated wall members 35 and 31 connected intermediate their length in parallel spaced apart relation by webs or wall sections 38 `and 39. This 'hanger fork is .supported from'thefma'i'ncasing in any `preferred orrdesired manner. Upon Vreference to Figs. 1 and 2 `it will -be observed 'that the sup-porting means shown in the-drawings comprise the sets of `bolts 35 andv351 threaded'through 'the closure This slide 4 wall 24 of the main casing and whose inner ends abut against the end faces of walls 36 and 31 of the hanger fork so that tightening the bolts secures the hanger fork suspended from the main frame in any predetermined elevated relation.

The walls 36 and 31 extend a substantial distance below the connecting webs or walls 38 and 33. These downwardly extending *portions take the form of tapering legs 43 and 44 (see Fig. 1), provided adjacent their lower ends with pivot `pins or pintles 41 and 48 received and held in horizontal openings through these ends. For reasons that will appear shortly these lower ends of legs -43 and 4'4 are shown as provided with inwardly Vdirected enlargements 50 and 5l `through which 'the pivot pins 41 and 48 pass.

It will be observed that the pivot pins extend inwardly beyond `these enlargements 50 and 5| .to 'form pivots for the spindle casing, now to be described.

The spindle casing is shown at 60 and lis a hollow casing the contour of which may be as illustrated in cross section in Fig. 2. It is supported adjacent its lower end on the aforementioned inward extension of pivot Apins '41 and 48 which are received in radially extending openings formed in the spindle casing as shown in Fig. 3. As ,a .result the spindle casing is free to swing about 'the horizontal axis dened by the .pivot pins 41 and 48 at the lower end of the hanger fork. The casing 60 is thickened in yopposition to portions 50 and 5l to complete the pivot bearing and to space the casing 60 and the .forks 43 "and 44. The arrangement illustrated in the drawings for controlling the angular position of spindle casing `60 about Vpivot l1-48 comprises a hollow plunger pin (see Fig. l) slidingly guided within casing 66 which extends outwardly from the web Io'r wall section 39 of Athe hanger fork and through an opening 68 in the closure wall 24 of the mainframe provided for cleara'nce and which guideway is 'shownclosed at its outer end as by threaded plug 69. The :plunger pin 65 is yieldingly forced outwardly by a spiral spring 1D contained within the guideway or casing 66 and which abuts at one 'end against plug 69 and the outer end against the inner surface of plunger '65. These parts are so .positioned and :related that Ythe nose of plunger 65 .'is yieldingly held against spindle casing 50 `and 'tends vto swing it clockwise about its pivot in the showing of Fig. 1 Yand maintain it against'the end of limiting `screw 13 which is .threaded through wall 38 of the hanger fork (see Fig. 1f), 'the parts being so lpositioned and related that "the nose 12 of limittract 'or 'advance the inose 12. Manipulation 'of operating handle 15 moves the'nose 12 to the left vin the showing of Fig. -1 to Swing the spindle casing 6U coun'terclockwise about its pivot against the'press'ure of spring 10. A locknu't 11 threaded on'the adjusting member 13 may be employed to lock -tlla't'member in its adjusted po'sition. As a result o'f this arrangement the plunger pin '65 holds the vspindle casing A6l) lengagedagainst the adjustable "member` 13 VIand the two cooperate v"tc i'x the angular position of the spindle Casing about 'its pivot.

` Withinthe upperend o'f the spindle casing 6D is contained either aprirne mover or va shaft vconnection thereto to driveea stub-shaft connected lto the cutter 'shaft' 82 which rotates within spaced bearings k83 fand 84. The lower Y'end H'of Hcutter 'shaft'82 carries gear 86 in mesh with crown gear 8l secured to the cutter head baseplate 88 in any 'Qpreferred or desired Vmanner Extending rearwardly from cutter head baseplate 88 is the -short spindle or shaft 89v held in bearingV 90 mounted inthe cutter'casing head9l. As a result'of'this arrangement the `rotation ofv the cutter shaft f 82` will -rotatethe cutter head baseplate 88;- 'The cutter head casing I9| mounted at the vlower -'end ofthe spindle casing has a circular flange 92 extending outwardly therefrom to engage freely fin the annular @groove 93 formed on the inner Vfaceof the cutter head baseplatel88.

Y he cutter head is vmounted for rotation on the lower end of shaft housing `ill'and is driven by the cutter shaft 82 supported therewithin. The 'cutter head baseplatev 88 is guided in this rotation-by the annular flange 82 engaged in the cirl'cular' groovev 93. Secured vto the outer face of the cutter head baseplate' is the cutter plate 91 to the outer faceof which is secured the grinding or cutting element or surface98.

The apparatus hereindescribed is seated with itsparts Yfully assembledon the valve top with the pads I' at: thebottom'ofthe baseplate I8, ,in'fdire'ct engagement'withtop surface B of the valvek casingjas the `surface ofV referenceand with the cutterfprojected into the valve body C and into adjacency to that valve seatk which is to be fced'offf Y Y 'It i's one of the objects of the invention that the parts be readily assembled for the facing off operation' and be readily disassembled when this operation Vis completed.- vThe adjustments provided 'for are for the v'purpose of bringingthe cutting element 98 into predetermined relationto the valve seat at the right in the showing of Fig. 1 for exam-ple, and the-se Yadjustments comprise the followingzThe ve'rtical position "of the cutting' element can be 'abjus'ted byV elevating or loweringgthe'fhanger fork; The walls 22'and 24 of the' main casing are vcut away as shown at B8 and`yl'v83'in FigsilfandZof the' drawings so that the plungerca'sing iand'the; adjusting member 13 will cleath'esev walls. lThe lateral adjustment of the cutter S18-towards the valve seat upon which it is to'opel'atef;l i. e., the adjustment inthe hori- 'zontaL is effected through adjustment of the slide frame by operating handle member 32. The

adjustmentfof theslide frames adjusts the'main frames and' the hangar forkyor housing and the -r shaft casing, in other words allof the! apparatus except the -base or bed plate I0. 'Ihe angular positionor-'relationof'the cutter 88 about a hori- `ontal axis is predetermined by member 13 oprera'ted by handle 14; vThese various adjustments can.V 'be effected with 'thef parts assembled as shown in the drawings and the valve, seat ground yor cut to the desired angle or degree.

When the facing off ofV one valve seat has been completed, the main casing is f lifted vertically (and with it all Aof the operating mechanism including the hanger h'ousing, the shaft casing and the cutter head) sufficiently to clear base 28 of the main casing from engagement with the two-dowel pins 21 and the main vcasing, reversed, i. e., turned 180.n about its vertical axis and then reseated upon theseV dowel pins 21; The grindingv or cutting element 98 will now be presented facing the other valve vseat in precisely the same relation as tothe three aforementioned adjustments jasv it was vpresented to" the valve seatV already faced AoflY sothat'y the other `Valve seat Will befraed pff ,to precisely thesanleangle and de- 'pI-have thus accomplished the purpose of my invention which as stated was to provide a simple v l t on the slide frame so that the main frame can .be

Vter with relation Vapparatus-which lcan be given the various adjustments required to fix the position of the cutto' the valve seat to be faced done this by the-use 'of a 'single reference for'the'grinding of both valve seats without disturbing that reference. It Iwill be observed that pivots 41--48and the adjusting 65 and 13 are so located-in membersv my apparatus,that the former is within the valve casing and 'adjacent the valve seats in the operative relation of the parts whereas the latterare well above the valve casing and far 'removed from the pivot 41-48. It will further be observed that the-parts are constructed for assembly the nested relation shown in the cross section of Fig; 2. The advantages that flow'ther'efrom will be' appreciated by those skilled in this f Having thus' described my invention, what 'I claim `and Adesire to secure by Letters Patent is: 1; Mechanism for facing off 4the inclinedseats of a gate valve without requiring the removal of the valve,V saidV mechanism comprising a bedplate havin-g anvopening therethrough-and adapted to be -seated on the upperv face of the vopen valve casing, a mainframe and 'means for mounting it on and `for sliding 4adjustment relatively to the bedplate,y said means comprising a-guideway on the bedplatev andv a slide frame receivedl therewithin, means for mounting the mainframe on thej -slide f -frame for adjustment therealongl, a hangerv'supported byandl for vertical adjustment relativelyto the, mainframe said hanger extending belowY the bedplate into adjacency to thek valve seats when the bedplate is seated on the valve casing and a cutter ,carrying member pivoted to the lower end of said hanger for angular adjustment about a horizontal axis located below the'bedplate and adjacent the valve seats to' bring theV cutter into parallelism with the valve seatito be faced olf, said cutter carrying member, extending above the base plate and means above the base plate forr angularly adjusting the cutter Carrying membensaid'm'eans Afor mountingl the main frame on thez slidefframe Vcomprising interengaging elements' spaced 180 apart in a Vhorizontal plane, for locating the main frame lifted vertically from the slide frame to disengage said elements,v said elements being duplications of each other whereby when the main frame is,V lifted from off the slide frame and turned 180. about a vertical axis it can-abe reseatedupon the slide frame with the cutter in rparallelism to the other valve seat. Y

2.. Mechanism forfacing off the inclined-seats of a gate valve without requiring the removal of the valve, said mechanism comprising a bedplate Ahaving an Vopening therethrough and adapted to be seated on the upper face of the open valve casing, a main frame and means for mounting it on and for sliding adjustment relatively to the bedplate,.said means comprising a guideway on the bedplate and a slide frame received therewithin, means-for mounting the main kframe on the slide frame vfor adjustment therealong, va

hanger supported by and for vertical adjustment VVrelatively-to the main frame saidhanger extending-below the bedplate into adjacencyjto the valve seats when the bedplate is seated on the valve casing and a cutter carrying memberlpivroted. tothe lower end of said hangerwfor" angular adjustment about a horizontal axis located below the bedpl'ate and adjacent the valve seats to bring the cutter into parallelism with the valve seat to be tacedo, said means for mounting vthe mai-n frame on the slide `frame comprising intereng-aging elements spaced 1-80" apart in `a horizontal plane, for locating the main frame on the slide frame so that the main frame can be lifted vertically from the slide frame to disenga'ge said elements, said elements being 'duplications of each other 'whereby when the main frame is lifted from off the slide frame and turned 180 about a vertical axis it can be rescate-d upon :the vslide frame with the Ycutter in `parallelism to the other valve seat.

3. :Mechanism for facing zoll the inclined seats of a ,gate valve without requiring the removal of the 'valve 'said vmechanism comprising ra bedpla'te having an opening therethrough and adapted to be seated on the upper face of the open valve casing, a main frame and vmeans for mounting it on and for Asliding adjustment relatively to the bedplate, said means comprising a .guide- 'way on the bedplate l'and :a slide frame received therewithin, means for mounting the main -f-rame :on the slide frame for adjustment therea-long, a member supported by and -for vertical adjust- .ment relatively to the main frame and hanger extending below the lbedpla-te into adjacency -to the valve seats when the bed-plate is seated on the valve casing and a fcutter carrying member pivoted to vthe lower end -of said hanger for 'angular adjustment about a horizontal axis located below the bedplate and. adjacent the valve seats to bring the cutter into parallelism with the valve seat to .be -faced off, said cutter carrying member extending above the base plate and means above the base .plate for angularly adjusting the cutter carrying member.

4. Mechanism for facing off the vinclined .seats of a gate valve without requiring `'the removal-of the valve said mechanism comprising rabedplate having an opening therethrough and'adapfted to be seated on the upper 'face of the open valve casing, 'a main frame and means 4for mounting "e it on and 'for sliding adjustment `relatively .t0 the bedplate, said `means comprising .a 'guideway on the v-bedplate and a slide frame 'received therewithin, 'means for 'mounting the main 'frame ',on the slide frame 'for Yadjustment therealong, a hanger supported iby and for vertical adjustment relatively to the main 'frame said hanger extending vbelow :the bedplate into laitljacency to the valve seats when the bedplate fis seated on the valve 'casing and a -cutter carrying member pivoted to the lower end of said 'hanger for 'angula-r adjustment 'about 'a horizontalaxis located below the bedplate 4and adjacent kthe valve seats tobring the cutter into parallelism with the 'valve seat'tobe faced oi.

5. Mechanism for facing loif the yinclined seats of 'agate `valve without requiring the removal of the valve said :mechanism comprising a bedplate having an opening therethrough and adapted to be seated on vthe Vupper face of the open valve casing, -a `main 'frame 'having a base and walls extending upwardly therefrom and means V'for mounting the main frame for sliding adjustment 'along "the Lbedplate, said means vcomprising a guideway on the bedplate and la slide frame received within 'the guideway and 'means for mounting the main frame on lthe slide frame for adjustment '.therealong, a hanger .supported for vertical adjustment `relatively thereto and ex- "tending below v'the bjedplateginto adjacency .to .the i ried with-in'said easing.

xE5. Mechanism -for facing -off `the inclined seats of a gate valve without requiring the removal of the valve said mechanism comprising a bedplate having an opening therethrough 'and adapted to be 'seated y'on the upper face of the open valve casing, a mainframe and means Afor mounting the mainframe for sliding "adjustment along the bedplate, a hanger 'supported for verticaladjust.. ment relatively thereto said 4hanger extending below the bed-plate into adjacency to the valve seats when the bedplate is seated on the valve casing and a cutter carrying'casing pivoted to the lower endof Vsaid hangerfor angular adjustment about 'a horizontal axis below `the bedplate and adjacent the valve seats, said cutter carrying member extending above the base plate and means above the base plate for angularly adjusting the cutter carrying casing to lbring the cutter into parallelism to the valve seat to be faced pif and cutter rotating mechanism carried within said casing.

'7. Mechanism for facing 01T the inclined seats of a, gate valve without requiring the removal lof the valve said mechanism comprising ya fbedplate having an opening therethrough and adapted to be seated on the upper face of the open valve casing, a main frame having a base and `Walls extending upwardly therefrom and means `for mounting the main -frame for sliding adjustment along the bedplate, said means comprising Aa guid'eway on the bedplate and a slide frame received within the guideway and means fortmounting the main lframe on the lslide frame, said last mentioned means comprising interengaging elements on the slide frame'and the base .of the-main frame which locate the main frame on .the slide frame and which permit the .main frame to vbe lifted oi .from oif the slide frame, said elements being located apart `in a, horizontal plane and being duplications of -each other whereby lthe main frame can be lifted from off the slide frame and turned 180'about a vertical axis and rreseated upon the ,slide frame, a hanger supported for vertical `adjustment relatively thereto said hanger extending below the bedplate Iinto adjacency .to the valve'seats lwhen the -bedplate is seated .on the valve casing and a cuttercarrying'casing pivoted to the lower end-of said hanger for angular adjustment about a horizontal .axis below the bedplate and adjacent the valvefseatsy said cutter carrying member extending above Ythe base plate and means above the lbase Dplate for angularly adjusting the cutter carrying casing to bring the cutter into parallelism to `the valve seat to be faced oil and cutter` rotating mechanism 4carried within said casing. y

8. Mechanism for :facing off the .inclined seats or" a gate valve without requiring the removal of the valve, Saidmechanismicomprising abedplate having an vopening therethrough and yadapted to be seated on the upper vface of the Vopen valve casing, a main frame and means for mounting the latter en the xformer comprising interengaging elements on the main frame vand on the bed- 9 plate which permit the main frame to be lifted vertically to disengage said elements, said elements being located on the frame and on the bedplate, 180 apart in the horizontal plane and being duplications of each other whereby the main frame can be lifted freely and turned 180 about a vertical axis and the elements reengaged, a member supported from the main frame for vertical adjustment relatively to the bedplate and a cutter carrying member pivoted to said` I first mentioned member for angular adjustment about a horizontal axis to lbring the cutter into parallelism with the valve seat to be faced off, whereby the two valve seats can be faced off in succession to the same degree without requiring any change in the angular adjustment of the cutter carryingV member.

9. Mechanism for facing off the opposed seats of a gate valvewithout requiring the removal of the valve said mechanism comprising a bedplate adapted to be seated on the upper face of the open valve casing and which serves as the reference for the bedplate and means for supporting a cutter from the bedplate in cooperative relation to one or the other of said valve seats, said means comprising a base member seated on the bedplate and interengaging means spaced 180 apart in the plane parallel to the bedplate for holding the base member against movement in a plane parallel to the bedplate butpermitting a movement of the base member vertically relatively to the bedplate to disengage said elements, said elements being duplications of each other whereby when the cutter has completed the facing off of one seat, the base member can be lifted vertically and turned 180 about a vertical axis and reseated to reengage said interengaging elements without-l disturbing the aforementioned reference for the bedplate, to thus present the cutter in operative` relation to the other valve seat.

10. Mechanism for facing off the opposed seats of a gate valve without requiring the removal of the valve said mechanism comprising a, bedplate adapted to be seated on the upper face of the open valve casing as the reference for the bedplate and means for supporting a cutter from the bedplatein cooperative relation to one of the 10 other of the valve seats said means comprising a slide frame adjustable along the bedplate and a main frame seated on the slide frame and interengaging means spaced 180 apart in the plane parallel to the bedplate for holding the mainV frame against movement relatively to the slide frame in a plane parallel to the bedplate but permitting a movement of the main frame vertically relatively to the slide frame to disengage said elements, said elements being duplications of each other whereby when the cutter has completed the facing 01T of one seat, the main frame can be lifted vertically and turned 180 about a vertical axis and reseated to reengage said interengaging elements without disturbing the aforementionedl reference for the base plate or the adjusted position of the slide frame, to thus present the cutter in operative relation to the other valve seat.

11, Mechanism for facing off the opposed seats of a gate valve without requiring the removal of the valve said mechanism comprising a bedplate adapted to be seated on the upper face of the open valve casing and which serves as the reference for the bedplate and means for supporting a cutter from the bedplate in cooperative relation to one or the other ofthe valve seats said means comprising a slide frame adjustable along the bedplate and a main frame seated on the slide frame and interengaging means spaced 180 apart in the plane parallel to the bedplate for holding the main frame against movement relatively to the slide frame in a plane parallel to the bedplate but permitting a movement of the main frame vertically relatively to the slide frame to disengage said elements, said elements being duplications of Veach other and means for adjusting the angle of the cutter whereby when the cutter has vcompleted the facing off of one seat, the main `frame can =be lifted vertically and turned 180 about a vertical axis and reseated to reengage said vinterengaging elements vwithout disturbing v the aforementioned adjustments or the aforementioned reference for the base plate, to thus present the cutter in operative relation to the other valve seat.

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