US876964A

US876964A - Valve-reseating device.

Info

Publication number: US876964A
Application number: US34363006A
Authority: US
Inventors: John G Holmes; George Puffer
Original assignee: Individual
Current assignee: Individual
Priority date: 1906-11-15
Filing date: 1906-11-15
Publication date: 1908-01-21
Anticipated expiration: 1925-01-21

Description

`TOHN G. HOLMES AND GEORGE PUFFER, OF WAUPUN, WISCONSIN.

VALVE-RESEATING DEVICE.

Specification of Letters Patent.

Patented Jan. 21, 1908.

Application filed November 15,1906. Serial No. 343.630.

To all whom it may concern:

Be it known that we, JOHN G. HOLMES and GEORGE PUFFER, citizens of the United States, residing at /Vaupun, in the county of Fond du Lac and State of Wisconsin, have invented a new and useful Valve-Reseating Device, of which the following is a specification.

This invention relates to a device for reseating globe and gate valves without the necessity of disconnecting the valves from the pipe system,I and it relates more particularly toa device for truing worn, irregular, or defective valve seats from time to time, until the stock at the seat becomes so cut away that further truing is impracticable, whereupon the entire seat is bored out and the opening topped for receiving a bushing adapted to form a new valve seat.

The invention has for one of its objects to improve and simplify the construction and operation of devices of this character so as to facilitate the truing and renewal of valve seats in a simple, reliable and eiiicient manner.

A further object of the invention is to provide a reseating tool which is of simple construction and composed of fewparts comparatively chea to manufacture, and which is adapted to e used for reseating valves of different sizes, and which is designed to employ dierent forms of cutters necessary for truing and renewing the valve seats,

With these objects in view, and others, as will appear as the nature of the invention is better understood, the invention comprises the various novel features of construction and arrangement of parts, which will be more fully described hereinafter and set forth with particularity in the claims appended hereto.

In the accompanying drawing, which illustrates one of the embodimentsl of the invention, Figure 1 is a semi-longitudinal sectionand elevation of the device shown in the operation of truing a valve seat of a globe valve. Fig. 2 is a fragmentary elevation of the device in the opera-tion of boring out an old valve seat for the reception of a bushing, the valve being shown as of the gate type. Fig. 3 is a perspective view of the lower end of the spindle and the tap for threading the bored out seat so as to receive the seat bushing. Fig. 4 is a perspective view of the seat bushing.

Corresponding parts in the several figures are indicated throughout by similar characters of reference.

Referring to the drawing, 1 designates the spindle of the device which has a working fit in the tubular body 2 in which the spindle is mounted to simultaneously rotate and move longitudinally. The spindle 1 is of the same cross section throughout its length and provided with a collar 3 adjacent its upper end. The top extremity of the spindle is formed into a non-circular head 4 for the reception of a brace, wrench, or equivalent means, for rotating the spindle. The lower end of the spindle is reduced to form a shoulder 5 and is provided with a transverse passage 6 of rectangular cross section for receiving the truing too'l or cutter 7, as shown in Fig. 1, or the boring cutter 8, as shown in Fig. 2. The cutters are held in place by a binding screw 9 which is threaded in the tapped 'opening 10 extending inwardly from the bottom end of the spindle to the passage 6, On the reduced portion 11, the tap 12 is adapted to fit, and the upper end of the tap is held against the shoulder 5 by the binding screw 13 engaging at its inner end in the socket 14 on the said reduced portion 11. By this arrangement, cutters and taps of dierent shapes and sizes may be separately used on a single spindle, so that the tool can be employed for various sizes and types of valves.

The lower end of the body 2 of the device is provided with an external screw thread 15 which is adapted to engage in the valve engaging portion, a threaded ring 16 being used in connection with small sized valves, as shown in Fig. 1, or in the yoke or bracket 17 for adapting the device to large size valves, as shown in Fig. 2. The ring `16 has an external thread 18 that is adapted to screw into the bonnet receiving opening of the valve casing, as shown, and several of such rings are provided so as to fit casings having bonnet receiving openings of different sizes. The yoke or bracket 17 is provided with' a central ta ped opening 19 which receives thethrea ed end 15 of the body 2 and on opposite sides of the opening are provided elongated slots 2O through which extend the screw bolts 21 for securely holding the yoke on the valvel casing At the upper end of the thread 15 the tubular body 2 is formed with an enlargement 22 constituting a shoulder arranged to bear on the supporting ring 16 or yoke 17. The

exterior of the body 2 is provided with a thread 23 which extends from the upper end to approximately the middle thereof, and the remaining surface is milled at 24, so as to -form a grip whereby the body can be screwed andA unscrewed with relation to the supporting ring or bracket. Engaging the thread 23 is a sleeve 25 which forms la means for feeding the spindle l. This sleeve is constructed with an internal annular shoulder 26 which abuts the upper surface of the collar l 3, so that the sleeve 25 causes the spindle to move downwardly as'it screws on the tubular body 2. The exterior ofthe feed sleeve 25 at 27 is milled so as to afford a gripping surface whereby the sleeve can be turned by hand. In order to hold the collar 3 in engag-ement' with the shoulder 26 and to prevent the falling of the spindle as well as to permit positive feeding movements in both directions, a split clamping ring 28 encircles the spindle l at a point above the sleeve 25 and is held rigidly on the spindle by means of the screw 29 which draws the end of the ring together. By means of the clamping ring and collar 3 engaging on opposite sides of the shouldered portion 26 of the feed sleeve, the spindle is held in place in the body Zand prevented from free longitudinal movement therein independently of the sleeve. By this construction, the several parts can be readily assembled and disassembled.

In the operation of truing a valve seat, the parts are assembled and positioned, as shown in Fig. l, with the cutter 7 secured to 'the spindle. This cutter is provided with a semicircular cutting edge 30 to correspond with the normal contour of the valve seat. The cutting edge, however, will be varied lfor different forms of valves. The spindle l is now rotated by a brace, or other suitableA means, and the depth of the successive cuts is produced by imparting a partial turn to the feed sleeve 25 from time to time as the spindle 1 is continuously rotated. In practice, a few turns on the spindle will be sufficient to properly dress the valve seat. After this is done, the device is removed from the valve casing and the bonnet with the valve is replaced so as to be ready for regular oper ation. It will thus be seen that a valve can be reseated with comparatively little trouble. When the stock of the diaphragm 3l forming the seat 32 becomes too far cut away by repeated reseating, the diaphragm is bored out by means of the tool 8 so as to form a cylindrical openin 33, as shown in Fig. 2. The tool is then ta ren out of the valve casing and After the opening is threaded, the device is removed and the seat bushin 34 screwed into the tapped opening. This ushing is preferably made of brass or equivalent material and is exteriorly threaded to fit the opening 33, and on the interior are the lugs 35, which form means for engagement with a suitable instrument whereby the bushing can be screwed in or out. After the bushing has been screwed into the proper position, the device is used with the cutter 7 for rounding off the top end of the bushing for the purpose of forming the seat. This bushing may be cut down from time to time as the seat becomes worn, and when required, a new bushing can be substituted. These bushings. are of simple construction, and will be made of different diameters, so as to fit valves of various sizes.

We have described the principle of operation of the invention, together with the apparatus which we now consider to be the best embodiment thereof, but we desire to have it understood that the apparatus shown is merely illustrative, and that various changes may be made, when desired, as are within the scope ofthe invention.

In combination, a tool carrying spindle in the form of a long cylindrical bar having an operating head and an annular iiange and provided at its lower end with a reduced portion formingv an annular shoulder, there being a tool receiving slot extending diametrically of such reduced portion and the side and end of the reduced portion having openings for the passage of tool binding screws, a cylindrical body bored for the passage of the spindle and having externally threaded upper and lower ends, a threaded sleeve fitting the upper threads of the body and having an inturned iange fitting over the flange of the spindle, and a collar clamped on the spindle above said inturned flange whereby the spindle may be positively fed in both directions.

In testimony that we claim the foregoing as our own, we have hereto affixed our signatures in the presence of two witnesses.

JOHN G. HOLMES. GEORGE PUFFER.

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