US1783762A - Packing for plungers - Google Patents

Description

Dec. 2, 1930. y D. R. YARNALL ET AL. 1,783,752

PACKING FOR PLUNGERS Filed Jan. 4, 1927 APatented Dec. 2,' 1930 v UNITED STATES PATENT OFFICE DAVID YARNALL AND OSEPH-KIIiDABE, OF PHILADELPHIA, PENNSYLVANIA,

ASSIGNORS TO YARNALL-WARING COMPANY, OF PHILADELPHIA, PENNSYLVANIA,

A CORPORATION F PENNSYLVANIA PACKING FOR PLUNGERS Application led January 4,

Our invention relates to packing for longitudinally movable shafts, rods and plungers.V The main purpose' of our invention is to armor or protect the packing so as to retain it as a compact body against injury. l

A further purpose is to use the compression of a molded ring to force vout a protective shield against the plunger securing the Aforms among the many applications and forms to which it may be suited, selecting constructions which are practical', efiicientV and inexpensive and which at the same time well illustrate the principles of the invention.

Figures 1 and 2 are fragmentary longitudinal sections of a valve to which our invention may be applied.

Figure 3 is a longitudinal section of a pump plunger gland packing further illustrating our invention.

Figures 4 and 5 are enlarged sections of slightly different forms of our packing.

. In the drawings similar numerals indicate like parts.

We show in Figures 4 and 5 enlarged sections of packing adapted to any of many different uses'. It comprises a non-metallic annular body 5 upon which is or are secured metallic facing 6 or metallic facings 6. 62 covering a part of the interior by a shell or shield 7 and a part or all of a transverse face 8 or 8. In Figure 5 two facings 6, 62 are shown.

1927. Serial No. 159,006.

state that we have secured good results with a molded body composed largely of asbestos with small amounts of graphite and rubber and a Monel metal shield.

We show the packing as applied to two types of valve and to a pump plunger, selecting these illustrations as typical of varied packing needs.

In Figure 1 the body 10 is provided withv upper packing 11 and lower packing 12 held in place by a shell ring 13 above the packing and a liner 14 below. The packing is compressed by any suitable means, here shown as the yoke 15 -secured to the body as by bolts 16. Both packings may to advantage be of our novelvform.

The body is supplied with inlet 17 and outlet 18 and the inlet 17 leads into a channel 19 about the lining so that a plurality of openings 20 permit passage of inlet fluid to the interior of the valve. The yoke mount-s a threaded stem 21 held against longitudinal movement within the yoke and turned by wheel 22. The stem operates the plunger 23 comprising, effectively in the illustration a plug 24 anda sleeve 25. The sleeve 25 is apertured at 26 so. as, in open position, to transmit water, steam and dirt from the inlet to the interior of the plunger, and henceto the outlet.

The upper packing is constantly engaging the uniform plunger surface and is subject to no special wear or injury. The lower packing is much more severely used.

As will be seen in the illustration, closing movement of the plunger will cause the lower portions of the openings 26 to expose the lower packing before the upper part of the openil'lgs ceases to register in part with the openings 20. as a result. of which the lower packing will be exposed to a considerable blast of fluid from the time ut which this exposure of the packing starts until the openings in the plunger cease to register at all with the effective openings in the valve body. This causes a very considerable erosion due to impact of water, steam and dirt against the lower packing. y

In the form shown in Figure 2 the saine reference characters have been applied to parts corresponding to those in Figure l but distance. parallel to the axis between the openings 15 and the packing so that inlet of Hui-d is shut off at all times when the packing is exposed. However, vpassage of the openings in the plunger over the packing here as in Figure l results in excessive mechanical wear of the packing.

The two shells 6 and 62 are duplicates, protecting opposite faces of the packing and comprising forms against which or by which the non-metallic material is compressed. These forms are effective even with different shape of the seats by which the packing ring is engaged, but are intended to cooperate With seats of the same shape.

This construction noty only permits the packing to be put in place with either face out but permits it to be used in one position and then reversed in position if desired.

In Figure 3 the packing surrounds the plunger 27 of a pump. It rests in an annular recess 28 Where it is compressed by gland 29 held by bolts 30.

In both forms of our invention the corners 3l of the packing are chamfered to fit a cor- 2. An annular packing for packing a lonmolded ring of non-metallic material in combination with a shell of metal covering a part only of the inner cylindrical surface of the ring and extending over part of the fiat annular surface of the ring, the inner cylin drical surface of the shell and the inner cylindrical surface of the packing not covered by the shell being iush one with the other, and the end of the inner cylindrical surface of the shell adjoining the extension over the fiat annular surface of the molded ring being tapered outwardly and toward the extension to force the flat annular surface of the metallic ring inwardly when the packing is cornpressed.

DAVID ROBERT YARNALL.

JOSEPH KILDARE.

responding cross section of recess and the ring is correspondingly chamfered at 3l.

The'tapered lip 32 of the lower end of the shell 7 of the form in Figure 4 presses l the shell inwardly With compression upon the' combined 'packing in an axial direction. At the same time the compression of the body 5 of the packing tends to squeeze the packing out into'tighter contact with the plunger Where the nonmetallic packing is exposed so as to prevent seepage past the packing.

It will be obvious that the armor or protective shell is advantageous not only for the actual physical protection against fluid or mechanical erosion but also because it secures the combined effects of metallic and non-metallic packing.

In view of our invention`and disclosure valuations and modifications to meet individual whim or particular need will doubt` less become evident to others skilled in the art, to obtain part or all of the benefitsrof our invention Without copying the structures shown, and We, therefore, claim all such in so far as they fall Within the reasonable spirit graphite and rubber in comr

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