US2455550A - Valve reseating tool - Google Patents

Description

Dec. 7, 1948. B ..H. BLACK 5 2,455,550

VALVE RESEATING TOOL 2 Sheets-Sheet l FiledAug. 15, 1945 Jig. 5.

1 INVENTOR y .B/UCZH B/ack M aw ATTORNEY Dec. 7,1948. Q BLACK 2,455,550

7 VALVE RESEATING T001, 7

Filed Aug. 15, 1945 I 2 Sheets-Sheet 2 Jig- ATTORNEY Patented Dec. 7, 1948 use are ratherqcomplicated and require considl erable time to perform 4 the] reseating operation. Some types also require a series of units. to fit various sizes of valves. i

unis-therefore an object of my invention to provide a simple and inexpensive :valve reseating tool which can quickly and accurately perform the reseating operation. 4 i

,This and other objects willbewmore apparent after referring to the following specification and attached drawings; in which: i i i w a Figure ly is a cross sectional view showing the tool in positionwfor machining a valve :seat;

Figure 2 is a sectional view taken on line lII- -II of Figure 1;. i 1 y i m, w i.

Figure 3cis a sectional view. taken on line III-III ofiFigure l; '1. M m

Figure 4 is an end view of; the cutter; i

5 Figure 5 is a view showing the profile of the teeth; Figure 6' is a fragmentary cross sectional view similar to Figure 1 showing a second em-bodiment oftheinvention; and a i Figure 7 is a! fragmentary cross sectionshowing a third embodiment otthe invention;

4 :Referring more particularly to the drawings, the, reference numeral c2indicates the bOdy of a gateva1ve which has Jvalveseats l and} to be recut. mAnxaxial opening 8 extends from valve seat 4 to the outside ofthe valve body 2 and is provideduwith .theusual threads l0. A:simi1ar opening I2, having threads :l4; extends from the valvewseatii tothe outside of the valvebody.

The tool consists of a cutter 16 which is similar to anend milling cutter and, as shown in Figures 4 and 5, is provided with v teeth :I8 around its periphery onone sidethereof and asquare opening 20 therein on the. same side as the teeth l8". A rotatable shaft 22 is detachably connected to cutter l6 by means of a square end 24 which extends into opening". The. shaft 22 maybe rotated by any well known. manual or. power means. The. hub portion 26 ;ofthe tool is :provided with a threaded opening 28 therein .for receiving a handle 30 which is longenough to extend out of the valve housing 2 when the valve stem and. associated mechanism is removed. On.

PATENT ff T f 2,455,550 Y vatvE RESEA'lING Tool. I ee nnlacaeamlnd.

I Application August 13, 1945, Serial No. 610,609 "fs d ar (01.995125) 1 OFFICE the side oppositethe teeth I8, the cutter I5 is provided with a spherical seat 32. A feed screw 34 extends from the outside of valvebody! through the. opening l2 and is provided with a spherical end 36 which engages the spherical seat 32. The other end of the feed screw 34 is provided with a reduced square portion 38: for receiving a hand wheel 40 which is held in place by means of a screw 42 screwed intoa threaded opening 44 at the end of shaft 34. Surrounding the feed screw 34 is an inner bushing 46 which has an eccentric threaded opening 483 therethrough for receiving the feed screw 34. The bushing 46 is provided with flat portions 50.. for receiving a wrench or similar tool to' rotate the bushing... The outer end of bushing 46 is provided with slots 52 and 54 for a purpose which will appear later. The bushing 46 is threaded into the eccentric opening 56 of an outerbushing 58 which is threaded into the threaded open; ing I4 of valve body 2. The bushing 581s pro vided with a handle 59 to facilitate turning thereof. -A lock nut 60, having a handle; :62 is threaded onto the bushing 58 and a lock nut. 64 having a handle 66 is threaded onto the bushing 46. A choke nut 68, having a handle 10;: is

threaded on that .portionof the bushing 46 having slots 52 and 54 therein. 4 The operation of the device is as follows:

When it is desired to machine seat 4, the out ter l6 ispositioned on the valve seat and held in place by means of handle 30. Outer bushing 58 is screwed into the threads M with the lock nut in place. Inner bushing 45 with nuts 84 and 68 in place is screwed into bushing 58 and feed screw 34 is screwed into bushing. The valve seats 4 and 6 are at an angle tothe center line. of the valve stem and the axial center line 120i the valve, so that the cutter l6, when hearing on the seat 4, will be at the same angle. To function properly, the center of the cutter I6 should coincide with the center 14 of the seat 4; Since :the cutter l6 sits at an angle, its center line 16 will not coincide with the valve center the feed screw is seated in the spherical seat 32 of the cutterwith the common center of curvature 18 at the pointof intersection of the feed screw center line and the cutter center :line

16. When the cutter I6 is centered on the seat 4 as indicated by the point .14, it will be noted that the center line of the feed screw 34 is eccentric in relation to thevalve center. line 121 For the purpose of centering the cutter, it is necessary to provide means for adjusting the eccentricity 82 of the feed screw in relation to the valve center line 12. This is done by combining the relative rotations of the eccentric bushings 46 and 58. The bushing 58 is easily turned to its desired position by means of its handle 59 and bushing 46 is turned by means of a wrench engaging the flat portions 50. With the eccentricity 82 set as desired, the lock nut L60 is tightened against"housing '2 and lock nut 64 is tightened against bushing 58, thus locking the bushings in hand wheel 40 to maintain pressure of the cutter 1 I6 on the seat l. Slots E52 and 54 permitspringiness of the end of bushing '46 so that when the choke nut 68 is screwed onto the thread of the v 4 the center of curvature of the spherical seat being at the point of intersection of the feed screw center line and the cutter center line, a bushing having a threaded opening therein for receiving the feed screw, and means for supporting the bushing with the feed screw extending into the axial opening in the valve on the side remote from the seat being cut.

2. A tool forreseating .a gate valvewhich has a threadedraxial opening; extendingzfrom each valve seat to thebutside of the valve comprising a cutter, a rotatable shaft detachably connected to said cutter and extending through the opening :iendiorengagingthe spherical seat of the cutter bushing, it will grip the feed screw 34- and"prevent it from turning when it is exerting the desired-pressure on the cutterh-Theehandlefiii is :removed and the rotat'able shaft --22 inserted into'lthe socketfiii 'ofthe cutter l6 and the shaft 1 dis machined, itheurese'atingitool is removed and repositionedswith-ithe cutter l6 bearing against valve seat 6,Whic'h. is then machined'inthe same manner .asrdescribed above'forvalve seat 4.

iFigure 6 showsa modification of my invention foriuse in small' va'lves. This modification is' the sameras that shown in :Figure 1 except-thatonly one aeccentricbushingzis used to centerthe' cutter 16 on the seat 4 and a locknutBL'having a handle 8B,:is provided to prevent turning of feed-screw 34in'place of the slots 52 and 54 and choke nut 68. The feed screw "34 is received directly in'the eccentric :threaded opening 56 oi "bushing -'58 and the device sanduoperation"thereof L is otherwise the same: as the'firsttembodiment.

.Figure 17 shows 'athird embodiment'of the invention which is suitable for use with-a flange gate valve. In this embodiment the valve-body 2 is provided "with flanges '88 having openings'Qfl therethrcugh. .A flange 52, havin openings '9 spacediin :the same manner as ope gs 90; is fastened to sthe fiange afl by means of bolts and nuts 1% rp'assing through the openings 90 and 94.

The 'tfiange"92 has a threaded opening 98 theretlnoug'hifor receiving bushing 58. In 'other words, the'bushing 158,; instead or being threaded into the threaded openingrof the valve body 2, is'threade'd into the threaded opening '98. Otherwise; the device rand its operation" is the same as that disclosed iniEigure 1.

While'three embodiments of my invention have been-shown and described, it will be-apparentthat other adaptations andimodifications may be made without departing from the Escape 0f the following claims.

1:1 claim: 7 I

:1. :A tool forrrese'ating agate valve which has-a threaded. axial opening extending-from eachvalve seat to the'outsideof the valve comprising a cuttena rotatablesshaft detachabiy connected to said cutterrand extending through theopening adjacent the seat'beingf'cut, a spherical-meat in the cutter on the'side opposite the rotatable shaft, a feedctscrew, saidieed screw) having :a spherical end tor engaging-the. sphericahseat o'f :th'e :cutter with with the center of curvature of the spherical seat being-at the point ofintersection of the feed screw center line and the cutter center line, a

bushing having -an eccentric -threaded opening therein for receiving said feed screw, and'm'eans forsupporting the bushing with the reed screw extending into the axial opening inthe valve'on the. side remote from the seat being cut.

JA-tool forreseating a gate valve which has -a threaded axial opening extending from each valve seat-to the outside of the valve comprising acut ter, arotatable shaft detachablyconnectedto said cutter-and extending through the opening adja cent thesseat beingcut, a spherical seat in the cutter on the side opposite the rotatable shalftya feed screwysaid feed screw having a spherical end for engagingthe spherical seat of the cutter, a bushing having an eccentric threaded opening therein for receiving said deed-screw, *a -second bushing having an eccentric threaded opening therein iorireceivin-g the firs't bushing,'-an'd means for supporting the second bushing With the feed screw texte'ndin'g'into the axial opening in the valve :on tthe side remote from "the seat being cut.

' 4.) A .toolsfor'rreseating a gat'e valve which has a threaded axial opening extending fromeach valve seat to the ioutside of the valve comprisinga cutter, said cutter having a non-"circular opening therein on ithe;side adjacent itheiseat to be cut, a rotatable shaft having its end shaped to be received in said non-circular opening, a spherical seat in the cutter on ztheesideropposite the :noncircular. "opening, a :feed'ascrew, v:said afeed rscrew having a spherical end for :engaging'thesphericai seat of i the cutter, .a bushing rhavingan eccentric threadedppening. "therein .for areeeiving said reed screw, and a second bushing :supportedrin ithe threaded axial opening .in the lvaive -on :the side remote-from theuseati being .cut,:said second 'bushingha-ving an eccentriczthreaded-opening therein for-neceivingxth first bushing. l

:5. -A .to'ol for reseating a gate valve which has a threaded axial opening rextendin'gifrom zeach valve seatvto :.-the outside of the valve comprising a cutter, .Said lcuttingihavingl arnon-circular opening therein on ,the si'd'e :adj merit the seat *to be cut,-- a rotatable-shaft shaving-its end shaped to bereceived :in said noncircular' opening, a spherical seat-in ;the":cutter pn :t'herside opposite-*the 'noncircular. ropening a deed screw,- =said ieed screw having asphericar'end for engag'ing the spherical seatnf the :cutter with the-"center of '-curvature of the spherical-seat bing at the point "of intersection Uf the feed screw centerlirre and the cutter center =1ine,-'a"bushing *having a threaded opening therein for receiving the feed "screw, and means'for supporting the bushing with'tthe' feed screw iextending int'o the axial opening in-the valve on the side remote from the seat being cut.

6. A tool for reseating a gate valve which has a threaded axial opening extending from each valve seat to the outside of the valve comprising a cutter, said cutter having a non-circular opening therein on the side adjacent the seat to be1cut, a rotatable shaft having its end shaped to be received in said non-circular opening, a. spherical seat in the cutter on the side opposite the noncircular opening, a feed screw, said feed screw having a spherical end for engaging the spherical seat of the cutter, a bushing having an eccentric threaded opening therein for receiving said feed screw, a second bushing having an eccentric threaded opening therein for receiving the first bushing, and means for supporting the second bushing with the feed screw extending into the a 6 axial opening in the valve on the side remote from the seat being cut.

BRUCE H. BLACK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS

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