US2060335A - Piston valve packing - Google Patents

Description

Nov. 10, 1936. H. E. MUCHNIC r sron VALVE PACKING I Filed Jan. 24, 1934 2 Qseets-Sheet l or 1g.

Nov. 10, 1936. H. E. MUCHNIC 2,060,335

PISTON VALVE PACKING Filed Jan. 24, 1934 2 Sheets-Sheet 2 l Patented Nov. 10, 1936 PISTON VALVE PACKING Henry E. Muchnic, Atchison, Kans, assignor to The Locomotive Finished Material Company, Atchison, Kans., a corporation of Kansas Application January 24, 1934, Serial No. 708,079

2 Claims.

My invention, more specifically stated, relates to a one piece steam distribution valve more especially intended for use in the steam chests of locomotives; the invention having for its object 5 the provision of a lighter valve than heretofore whereby the reciprocating load on the valve operating mechanism is reduced.

Another object of the invention is the provision of a valve provided with an integral wear 10 resisting riding shoe or facing in conjunction with flexible or sectional packing rings or sectional ring assemblage.

These objects and the advantages resulting therefrom will be more fully comprehended from 15 the detailed description of the accompanying drawings, wherein:

Figure 1 shows one end of my improved valve in elevation; an intermediate part of the valve broken away, and the other end shown in sec- 20 tion.

Figure 2 is a sectional elevation of asegmental portion of an end of the valve and taken substantially on the line 2-2 of Figure 1.

Figure 3 is a detail sectional view of one of comprises a one piece valve composed of the ln- 40' termediate tubular portion H], of predetermined length and diameter, and terminating in the integral heads II and I2; that is to say the body of the valve consists of a single piece as shown in Figure 1. The ends or heads are of predeter- 45 mined diameter and'width.

The end or head I! is internally provided with a sufllcient number or spokes l3 formed integral with the inner perimeter of the head and at their inner ends terminating in a hub portion I4. The

50 hub I4 is centrally provided with an opening which=receives the enlarged or head-end l5 of the valve-stem or rod l6 which only a portion is shown. The rod l6, adjacent to the hub I4, is shown threaded to receive a suitable nut ll 56 and lock-nut l8, whereby the hub is firmly clamped between the rod-head l and the nut l'l. With the valve body composed of a single, rigid piece, thevalve-stem or rod l6 need not extend through the length of the valve as in constructions heretofore employed, and hence 5 the weight of the valve is materially reduced and at the same time possibility of play is eliminated. My single piece valve body provides a lighter construction and hence less wear on the valve gear and on the valve chamber bushing will be 10 encountered as well as less wear on the weight supporting elements or packing elements of the valve results and hence a longer lived valve is provided requiring less frequent renewal of the packing.

In the particular exemplifications the valveheads or ends II and I! are provided with two parallelly arranged and spaced apart channels as at IS; the channels at one of the sides being undercut to provide the internal lip or shoulder as at 20; The bottoms of the channels I!) in the construction shown in Figure 1 are provided with annular grooves 2|.

The grooves 2| in the structure shown in Figure lare intended to receive the expander rings 95 or springs 22, which, in this instance, are circular in cross-section; the springs 22 being disposed beneath the bottoms of the channels IS.

The channels l9 are provided with sectional packing rings 23. The various segmental sections at their inner perimeters are provided with the laterally disposed-enlargements or heads 24. The width of the channels 19 above the lips or shoulders 20, namely between the outer perimeter of the valve-heads and the lips or shoulders 20, is suflicient to permit the enlarged inner perimeters of the ring-segments. to be inserted into the channels.

The distance between the bottoms of the channels and the lips or shoulders 20 is greater than 4 the thickness of the enlargements or heads 24 of the sectional rings 23, thus permitting the sectional packing rings to be distended through the action of the expanding springs 22.

In order to hold the packing ring sections in the channels, I provide the. snap or spreader rings 25 which are inserted along one of the sides of the packing rings, that is to say in the side or the channel which is not undercut or provided with the annular lip or shoulderv 20. The snap rings 25 are of radial dimensions substantially equivalent to the radial distance between the heads of the ring segments and outer perimeter of the packing ring so that the outer perimeters of the snap rings will not extend beyond the outer perimeters of the packing rings 23. The snap rings 25 are of suflicient thickness to cause one side of the enlargements or heads of the packing rings to remain in the undercut portion, namely beneath the lips or shoulders In order to prevent the snap rings 25 rotating, these rings, at a convenient point, preferably at the split in the rings, are each provided with a cut-out portion or notch, as at 26 in Figure 2, to receive a dowel 21 inserted transversely in a suitable hole in the adjacent side of the head of the valve.

The heads II and I2 of the valve between the spaced apart grooves in each head are provided with relatively wide channels which are filled with wear resisting shoes or bands 28; the shoes or bands being made of a suitable wear resisting metal such as bronze and the like; and these bands are preferably integrally secured to the valve-heads.

In Figure 3, which is a detail sectional view of a portion of a valve-head, the valve head is shown provided with the parallelly arranged and spaced apart channels 29, 29. In this modification the channels are undercut on both sides so as to provide the inner lips or shoulders 30, 30 in both side walls of each channel.

The packing ring assemblage consists of two sectional rings in each channel; the ring sections being somewhat L-shape in cross-section as shown at 3|, with the base or laterally disposed portion at the inner perimeters of the ring sections located in the bottom of the channels so that the laterally disposed portions of the packing ring sections will lie in the channels beneath the lips or shoulders 30 and the ring sections prevented from moving out of the channels; the distance between the lips or shoulders 30 and the bottom of the channel, however, being considerably greater than the thickness of the laterally disposed base or flange of the packing ring so as to permit radial outward movement of the packing ring sections, as is clearly apparent from the construction shown.

The two packing rings in the same channel are maintained in spaced relation with each other bythe split or spreader ring 32, which is of such thickness that the packing rings will be held adjacent theside walls of the channel so that the laterally disposed bases of the packing rings will be held beneath the lips or shoulders 30, 30, as shown, thereby preventing the packing rings from moving too far out of the channels and from dropping out in the event of breakage.

' In order to maintain the sectional packing rings and the spreader rings in their proper prearranged relation, I insert dowels as at 33 through suitable holes in the packing rings, while the split or spreader rings are grooved or notched on their inner perimeters as shown at 26 in Figure 2. This enables the packing rings to be inserted into the channels 29 and the two rings then spread apart and the spreader ring 32 then put into place.

Before the packing ring assemblage is put into the channels, the expander rings 34 are first put into the channels; the expander rings 34 in this instance being preferably in the nature of fiat springs of width suflicient to engage with both sectional rings of the assemblage so as to cause the sections of both rings of the assemblage to move radially in unison.

The circumferential face of the valve-head, intermediate of the two channels 29, 29, is also preferably provided with a wide channel which, like the structure of Figure 1, is provided with a wear resisting shoe or band 28 of suitable wear resisting metal which is integrally secured in place.

In Figure 4, which shows a similar section of a valve-head, the end or head portion of the valve is shown provided with a pair of channels 35 having straight side walls; each channel having a pair of juxtaposed sectional rings 36, 36; the sections of the two rings being held in their prearranged 'relation by means of a dowel 31 which passes laterally through the adjacent sections.

The ring sections at their outer perimeters and on what may be called the outer sides are provided with the laterally disposed lips 38 which extend over the perimeter of the valve-head which in the particular exemplification is grooved on opposite sides of the channels to receive the lips 38.

The bottoms of the channels are shown provided with the flat springs or expander rings 34, disposed beneath each ring 36 so as to cause the latter to become distended at the same time; the springs 34 being inserted in the channels 35 before the packing rings are inserted.

The portion of the perimeter of the valve-head intermediate of the two channels 35 is shown provided with a wide channel in which a shoe or band 28 of wear resisting metal is integrally secured.

In Figure 5, the section of valve-head there shown is provided with a pair of laterally spaced apart channels l9, substantially similar to those shown in Figure 1 and undercut on one side to provide the shoulders 20; while the bottoms of the channels are also provided with the annular grooves 2|. These grooves are provided. with the springs or expanders 22, 22 like in Figure 1.

The channels are each provided with a ring composed of segments 39, L-shape in crosssection with the base disposed in the bottom of the channel and the base of the ring extending substantially throughout the width of the channel.

Each channel also has a segmental ring 40 which rests on the base of the segmental ring 39. The base of the ring 40, at one side, is provided with a laterally disposed lip 4| which is adapted to extend beneath the shoulder 20 on the side wall of the channel when the ring assemblage is in position.

The two segmental rings 39 and 40 are maintained in lateral spaced relation by a spreader ring 42. With the rings 40 resting on the bases of rings 39, it is apparent that the expander springs 22 will cause both rings to be distended.

The valve, like in the other constructions, is also provided with a wear resisting band or shoe 28 preferably integrally secured to the valve-head.

In the detail sectional view Figure 6, the valvehead is also provided with a pair of parallelly arranged and. spaced apart channels 43, substantially similar to those shown in Figure 4, except possibly for depth; and these channels are each provided with segmental rings 44 of similar construction, in side to side relation and without lips. The abutting sides of the ring segments are provided with semi-cylindrical grooves 45, 45, to receive the round expansion spring 46; while one pair of segments in the bottoms of these grooves are bored to receive the head or cross-pin 41 formed at one end of the split expander ring 46. This not only ensures the spring being maintained in proper position, but it also maintains a prearranged relation of the joints between the segments of one ring '44 and the joints of the other ring 44 so that the joints of the two rings are not capable of shifting so as to register.

This structure is similar to that disclosed in my patent No. 1,572,443.

The valve-head intermediate of the two sets of packing rings is also channeled and provided with the wear resisting shoeor band 28.

Figure 7 shows a section of valve-head with a pair of channels 43, spaced apart and each provided with plain sided sectional packing rings 48; the segments of both rings being similar and both rings resting on the flat expander or spring 34; while the valve-head outer perimeter, intermediate of both channels 43, is also preferably provided with a wear resisting band or shoe 28 integrally secured in a wide channel in the valvehead.

With my improved structure, wherein the heads or ends and the intermediate tubular body portion are all made in one piece; it is apparent that the possibility of steam leaks is eliminated which, however, is not the case with the com-- posite type heretofore employed wherein leaks between the follower and the bull-ring and between the bull-ring and the spool and between the spool and the follower are possible, especially when the connections between the two followers or spiders become loose. At the same time a very much lighter valve is provided and hence the reciprocating load lightened and consequently wear considerably reduced. Furthermore, wear is also further lessened by the application of a band of wear resisting metal around the valve-heads or ends.

I have described my invention as a steam distribution valve, although it is apparent that the invention is applicable to means of that general character as for example steam pistons and the like; the expressions employed being merely terms of description and not terms of limitation.

What I claim is:

1. In a steam distribution valve the head portion whereof is provided with a ring-receiving channel, a packing ring assemblage in said channel consisting of a sectional ring and a one piece ring, the ring sections having laterally disposed portions, while the one piece ring is self-expansive and is disposed in a circumferential plane coincident with said laterally disposed portions whereby outward movement of the sectional ring is limited when the assemblage is removed from a cylinder, the relation between the ring sections and said one piece ring being such that the outer perimeters of the sectional ring and of the one piece ring will lie flush with the cylinder walls; and an expander located in said channel beneath the assemblage.

2. A segmental packing ring provided with a continuous circumferential groove, an expander beneath the ring, and an expansible packing ring adapted to seat in said groove.

' HENRY E. MUCHNIC.

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