US2892644A

US2892644A - Packing means for plunger valves

Info

Publication number: US2892644A
Application number: US437818A
Authority: US
Inventors: John E Collins
Original assignee: International Basic Economy Corp
Current assignee: International Basic Economy Corp
Priority date: 1954-06-18
Filing date: 1954-06-18
Publication date: 1959-06-30
Anticipated expiration: 1976-06-30

Description

June 30, 1959 J. E. COLLINS PACKING MEANS FOR PLUNGER VALVES 3 Sheets-Sheet 1 Filed June 18, 1954 H r n. 9 5 h vfl m M Q 0 m 2 a 5 6 v W W A II. m R J a m J Q INVEN TOR. John 5 Collins AY'TOR/VEYS June 30, 1959 J. E. COLLINS Filed June 18, 1954 INVENTOR. John E. (bl/ins ATTORNEYS June 30, 1959" J. E. COLLINS 2,892,644

PACKING MEANS FOR PLUNGER VALVES Filed Jun'e 18, 1954 3 Sheets-Sheet 3 V EN TOR.

(lo/m Col/ins A TTOR/VEYG Unite States Patent C 2,892,644 PACKING MEANS FOR PLUNGER VALVES John E. Collins, Akron, Ohio, assignor, by mesne assignments, to International Basic Economy Corporation, New York, N.Y., a corporation of New York Application June 18, 1954, Serial No. 437,818

Claims. Cl. 286-46 This invention relates to improvements in a packer or packing means and more particularly to that found in a packing assembly for a plunger valve.

One of the objects of the present invention is torpro- 'vide a packing assembly for location in the space between two relatively movable members wherein said packing assembly includes a packer mechanically locked therein so that the packer may be of relatively soft material to provide a long wear life without danger of being blown from the packing assembly.

A further object of the present invention is to provide a packing assembly for a plunger valve wherein said packing assembly has a packer shaped to effect a me- A further object ofthe present invention is to provide a packing assembly having a packer therein and located between two relatively movable members with said packing assembly mounting saidpacker so that high pressure use will tend to pull the packer away from the member movable relative thereto so as to decrease wear therebetween.

-A further object of the present invention is to provide a plunger valve that can be economically manufactured on a mass-production basis with valve parts which can be readily assembled or disassembled to permit repair, replacement or interchange of the parts.

- A further object of the present invention is to provide wa fplunger valve design whereinthepacker f'or sealing is maintained under stress and wherein wear and tear there- "on' is eliminated or reduced to a minimum.

-A further object of the present invention is to provide a packing assembly having a packer thereinand being characterized by its structural simplicity, inexpensive manufacturing costs,-easeof assembly operating eificiency, and strong and sturdy nature under all "operating conditions.

Other features of this invention reside in the arrangement and design of the'parts for c'arrying'out their -ap- ,propriate-functions.

Other-objects and advantagesof this invention will -b apparent from the accompanying drawings and description and the essential features will beset forthin'the appended claims.

In the drawings, I

, Fig. 1 is'a longitudinal sectional view through a plunger valve having a-packing-assembly with one of the packers of the present'invention;

Fig. 2 is a side elevational'view,partially in section, ofthe-packer inFig. 1;

Fig. -3 is'an elevational view taken in theaxial directionof'the packer in Figs. 1- and 2;

A Fig. 4 is an enlarged longitudinal sectional view of the structure surrounding the packer in a portion of i 1;

Fig. 5 is'an enlarged transverse sectional viewthroug ice the plunger valve and packer taken along the line 5- 5 in Fig. 1; I

Fig.6 is an enlarged transverse sectional view through the packer and plunger valve taken along line 6-6 in Fig. 1; 1

Fig. 7 is an enlarged longitudinal sectional View, similar to Fig. 4, of a modified construction of the packing assembly elements abutting axially against opposite sides of the packer in Fig. 1;

Fig. 8 is a longitudinal sectional view through a plunger valve, similar 'to Fig. 1; having a packing assembly with another form of packer of the present invention;

Fig. 9 is an enlarged longitudinal sectional view of the structure surrounding the packer in a portion of Fig. 8; while Fig. 10 is a perspective view, partially in section, of the packer in Fig. 8.

Those familiar with the state of development of this art will recognize that the present invention might be adapted to var-ions uses, but I have chosen to show the same used with a three-way, exhausting type, plunger valve with an open end exhaust.

The plunger valves in Figs. 1 and 8 each include an outer valve body member 10 having ports 10a and-10b formed therein and in fluid communication with the bore of the body member wherein a valve stem member or plunger 11 is mounted for endwise movement between a shut-01f and exhausting position and a fluid flow position between the

ports

10a, 10b. A packing assembly 12 in Fig. 1 and 112 in Fig. 8 is located in the space between the relatively

movable valve members

10 and 11 with this packing assembly .generally fixed against axial movement with respect to thevalve body member 10 by means of having screw-

type end plugs

13, 14 or 113, 114 screwed into opposite ends of the through bore in the valve body member 10.

The valves in Figs. 1 and'8 are three way, exhausting type valves of the open end exhausting type shown in their exhausting positions. Each valve in its illustrated exhausting position permits its port 10a to exhaust through the

exhaust ports

13a or 113a respectively in the end plug 13 or v113 while cutting ofi flow from the high pressure port 10b. Both end plugs for any one valve are identical except for the addition of

exhaust ports

13a or 113a in one.

It should be understood that in its broader aspects this invention includes the placement of this

packing assembly

12 or 112, or similar structure, between any two relatively movable members with these members not necessarily taking the form of the valve body member 10 and the valve stem member .11 of a plunger type valve.

Since many features of the Figs. 1, 4, 7 and8 constructions are identical, all the common or similar features will be described at the same time. The packing .assemblies 12 in Fig. 1 and 112 in Fig. 8 include respectively an annular packer 15 of'generally V-sh'ape'in cross section with this 'V-shape approaching a Y-shapebecause of the enlargement at the-junction of the legs of the V and an annular packer 115 of generally I-shap'e in cross section. The

packers

15 and 115 have respectively "O- ring or

annular portions

15a, 15b, 15c and 115a, 11'5b providing sealing portions between the

valve members

10 and 11. These "O ring portions are respectively located at the opposite ends of connecting leg'sfor webs'lSd, 15a, and 115d and'integrally cast or otherw'ise formed therewith. The cross sectional diameter of each b-ring portion is greater than the width of its

respective'connecting leg

15d, 15e or 115d, and these legs are solid, annular members so that no leakage can occur axially of the packer '15 or 115 between-annularportioris'lSaflSb, 15c or 115a, 115b. The packerslS and 115are molded or otherwise formed as a one-piece member of rubber,

rubber-like, or other similar resilient sealing material.

The

packing assemblies

12 and 112 respectively also include

annular elements

17, 18 and 19 in Fig. 4 and 117,

118 in Fig. 8 to urge the O-

ring portions

15a, 15b, 15c and 115a, 1151; into sealing contact with the

members

10 and 11 and to mechanically lock'the packers and 115 in the packing assemblies. The resiliency of the

packers

15 and 115 permit limited axial relative movement of the eleannular

sleeve spacer elements

17, 18 and 117, 118 abut against opposite sides of, straddle, and are axially aligned with the

annular packers

15 and 115 located therebetween while the annular wedge or spreader element 19 in Fig. 4 is located between the diverging legs of the V- shape in radial alignment with the inner O-ring portion 15a. In the cross section of Fig. 9, the I-shape annular packer 115 has the lengthwise extending center line of the connecting Web coinciding with the line connecting the centers of the O-ring portions 115a, 115k. This line is inclined upwardly to the left at about a 45 angle in Fig. 9 with respect to the central axis of said packer extending horizontally in Figs. 8 and 9. In Fig. 9, this inclination permits annular element 117 to have a cylindrical portion 1170 to be located radially inwardly from O-ring portion llSb and permits annular element 118 to have a cylindrical portion 1180 to be located radially outwardly from O-ring portion 115a. These elements coact together in both Figs. 4 and 8 to lock the

packers

15 and 115 by the O-

riug portions

15a, 15b, 15c and 115a, 115b and the connecting

legs

15d, 15c and 115d in the

packing assemblies

12 and 112.

In Figs. 4 and 9,

surfaces

17a, 18a and 117a, 118a on the

respective sleeve elements

17, 18 and 117, 118

straddle the O-

ring portions

15a and 115a and extend generally parallel to each other and transversely to the central axis of the valve stem 11 in contrast with the corresponding surfaces in Fig. 7 to be later described.

It should be noted that the seals between the O-

ring portions

15a and 115a and the valve stem members 11 are dynamic seals since the valve stem members 11 are movable endwise relative to the

packing assemblies

12 and 112, while static seals exist between O-

ring portions

15b, 15c and 115d and the bore of the valve body members 12. These sealing surfaces prevent endwise leakage between these valve members.

The valve constructions in Figs. 1 and 8 respectively include three

packers

15 and 115, and two

annular sleeve elements

17, 18 and 117, 113. The Fig. 1 construction also includes three annular wedge elements 19. The inner noses of the screw

type end plugs

13, 14 and 113, 114 provide surfaces corresponding to those found on the ends of the

annular sleeve elements

17, 18 and 117, 118 to complete the

packing assemblies

12, 112 located in the space between the

valve members

10 and 11. The centrally located packers 1S, and 115 in Figs. 1 and 8 are straddled by and located axially between the

valve ports

10a and 10b where they communicate with the bore of the valve bodies 10 through ports 17b, 18b and 1171:,

11815 in the

sleeve elements

17, 18 and 117, 118 respectively.

The operation of each valve is basically the same and should be readily apparent. When the valve stem member 11 is in the Fig. 1 or 8 position, flow between the valve ports 10!: and 10b is cut 011 but valve port 10a may exhaust through the

exhaust ports

13a or 113a in the

end plug

13 or 113. However, when the valve stem 1 member 11 is moved toward the right in Fig. 1 so that the necked-down portion 11a thereon straddles the centrally located

packer

15 or 115, flow may take place from the valve body port 10a to the valve body port 10b through ports 17b, 18b, or 117b, 1181) and along the necked-down portion 11a of the valve stem. Then, exhaust flow out ports 13a or 113:: has been cut otf. Annular grooves are provided in the periphery and in the bore of each

sleeve element

17, 18 or 117, 118 so that flow may take place through one or more of the plurality of the circumferentially spaced ports 17b, 1817 or 117b, 1181) in the annular walls of the sleeve elements.

The ease of assembly and disassembly should now be apparent. The valve parts and the parts of the

packing assemblies

12 and 112 may be easily assembled, replaced for repair and interchanged with other identically shaped parts in the valve assemblies. This construction makes it possible to manufacture valves on a mass-production basis, to thus increase uniformity of valve operation, and to decrease manufacturing cost. The packers 15 and are maintained under compression with wear and tear thereon eliminated or reduced to a minimum. In the Fig. 1 construction,

annular elements

17 and 18 are identical so that not only they may be interchanged with each other, but also one or both may be turned end for end to position them properly for assembly. In the Fig. 8 construction, the lack of symmetry in packer 115 about a vertical transverse central plane requires variations in design of the surfaces engaged therewith. In the illus trated construction, the noses of end plugs 113 and 114 are identical so that the packing

assembly elements

117, 118 and the packers 115 can be turned end for end as a unit and the valve will still operate properly. Hence, the

elements

117 and 118 must be assembled with both facing the same Way; it is impossible to get them in the wrong way if packers 115 are to be properly used.

Additional types of multiple way valves can be formed from the component parts disclosed. First, if

exhaust ports

13a and 113a are closed, the Fig. 1 and Fig. 8 valves become two-way valves. Second, if either another

annular element

17 or 18 and annular element 19 and packer 15 is added to Fig. l or if another annular element 118 and packer 115 is added to Fig. 8, another type valve will be formed if the valve body 10 has another port correspondingly added thereto in fluid communication with the added annular element. The valve type will be either a four-way open end exhaust or a three-way-pipedexhaust with the latter having

exhaust ports

13a and 113a blocked. Third, a four-way-pipcd-exhaust valve may be formed by duplicating the element and packer set mentioned in the immediately foreging second illustration and providing a suitable number of ports in the valve body.

The

packing assemblies

12 and 112 as well as packers 1S and 115 therein have several advantages, and these are especially apparent when each packing assembly is mounted in a valve in the manner shown in Fig. 1 or 8. First, the

packer

15 or 115 has greater stability with respect to blow-out and dislodging from its mounting because a mechanical lock coacts with its V-shape or I-shape to hold the packer in proper location. Blow-out tends to occur, for example, when the valve stem member 11 is suddenly shifted to the right from its Fig. 1 or 8 position to permit flow between the

valve body ports

10a and 10b. This action will produce a sudden pressure change on the centrally located

packer

15 or 115 and also remove the support from around the bore thereof. When the pressure change is sufliciently great and sufficiently sudden, it will tend to squeeze out or blow out the

packer

15 or 115 from its mounting in the packing assembly. Blow-out is especially prevalent when a conventional O-ring is used. However, in the present construction, the

annular elements

17, 18, 19 or 117, 118 respectively coact with the shape of the

packer

15 or 115 to mechanically lock it in position so that it is impossible to pull the packer loose by this difierential pressure.

Second, the

packers

15 and 115 present all of the advantages of an O-ring since each of the O-

ring portions

15a, 15b, 15c and 115a, 115b are shaped like an O-ring where they make sealing contact with the

valve members

10 and 11. The flexible connecting

webs

15d, 15c and essee 11521. also ipermitxthe tflexing action-"obtained from the ordinary D ring. I

".Third, a softerz;(dufohieter rating.) packer or 115 inlay he used since. its hardnessiis not avfactor -in main- ?taining .its;p.osition against blowout becauseazmechanical r the dynamic seal'formedby oring portion 15aor'1'15a "and the"movable-plunger "11'. any increase in-end thrust, whether caused by differential fluid *pressure's along 1 the *bore of the valve or by tightening of one of the-endplugs "13,14, or 114; will be transmittetiin Figs. 4,- 7 and 8 {through the smaller, outer -0=fingportions 15b, 151: or

{7115b to increasetlrestatic-sealinthe valve bodyboieinstead of through-o ring-portion 1'5a or 1151;. Hence, "Owing portibn'15aor'1'15a'is-not'squeezed by end thrust and therefore the friction .on plunger 11 is not increased at the dynamic seal. "Note, for'example, the clearance between O-rihgportionJSareinclsurfaces 17a,='13iz inIFig. 4. Theseadvantages are notobtained when an ordinary O-ring is located between adjacent sleeve elements, corresponding, for example, to

sleeves

17 and 18.

Fig. 7 discloses another form of the invention especially adapted for high pressure use (over 200 p.s.i.). This construction is exactly identical to that shown in Fig. 4 except that the parallel and

annular surfaces

17a and 18a in Fig. 4 straddling the O-ring portion 15a have been changed to tapered

annular surfaces

17a and 18a in Fig. 7. It has been noted that under high pressure conditions the O-ring portion 15a forming the dynamic seal has a relatively short wear life in some installations. Under high pressure conditions, the shape of

surfaces

17a and 18a, diverging in the outward direction away from the dynamic sealing surface with the relatively movable inner member 11, cause the O-ring portion 15a to have a tendency to climb up these diverging

surfaces

17a and 18a and thus to lessen the squeeze on the valve stem 11 and to reduce the wear on the packer 15.

It is contemplated that the present invention will include within its scope modifications of the present construction. For example, the V-shape of packer 15 may be inverted with the diverging legs diverging inwardly instead of outwardly as the latter is shown in the present construction. Then, the annular wedge element 19 would be located radially inwardly from the O-ring portion 15a instead of radially outwardly therefrom. However, the illustrated construction is the preferred construction and the larger O-ring portion 15a provides a longer wear life at the dynamic sealing surface.

Various changes in details and arrangement of parts can be made by one skilled in the art without departing from either the spirit of this invention or the scope of the appended claims.

What I claim is:

l. A packing assembly for placement in a space be tween relatively movable members comprising, an annular packer with annular portions at the opposite ends of a connecting web, and annular elements abutting against said packer to expand the same radially and urge one of said annular portions into sealing contact with one of said members and urge the other of said annular portions into sealing contact with the other of said members said elements having surfaces straddling but spaced axially from one of said annular portions.

2. A packing assembly according to claim 1 in which said straddling surfaces mutually converge toward the location where the annular portion straddled by said surfaces engages its respective relatively movable member.

y .233. -;A= .packing -gassen'ibly; for placementkin a space .betwe,en relatively :niovable; inner and outer members com- :prising, an :annulargpacker with :O-ring portions .at the opposite end's :of.:a; connecting '--Web and with the cross sectional :diameter of each 'O-ring'portion being greater thanIthe-width.cf'its:connecting web, and annular elernents abutting against "said packer to expand thesame :radially and-urgconeofsaid- O-ring portions into-sealing contact with the inner. member and urge the-other -O'-ring ,pdftion .into sealing-contact with the outer member and to lock said web and O-ri'ng portions in said packingaas- -se'mbly, said I-elements having surfaces straddling but spacedaxially from one. of said-O-ring portions. I

'4. -A packer 'assemblyzaccording .to claim 3 wherein said -0-ring;portions are radially and axially oifset from eachwother relative to the icentral axis about which the qpackerisfannular. V 1 I :5. 1A packing assembly for, placement in .a spacebetween relatively movable innergand router members -.comprising, ian -an'nular packer of generally V-shape in cross section wi'thO-ring portionsat the opposite ends of'each :legzand with theeross'sectionaldiameter of each =0-ring {portion-being greaterthan the width of its connecting leg, -and'annularielementsabutting against said packer to expand the same and --.ur-ge one O-ring portion into "sealing contact with the-inner m'efmberand urge the other O-ring portionsintorsealingcontact with the outer memben said annular elements including at least two sleeve elements abutting against opposite sides of and axially aligned with said packer and including a spreader element disposed, between the diverging legs of said V-shape to lock said legs and O-ring portions in said packing assembly.

6. A packing assembly for placement in a space between an outer valve body member and an inner valve stem member which is endwise movable within the outer member comprising, an annular packer of generally V- shape in cross section with O-ring portions at the opposite ends of each leg and with the cross sectional diameter of each O-ring portion being greater than the width of its connecting leg, and annular elements abutting against said packer to expand the same radially and urge one 0- ring portion into sealing contact with the inner member and urge the other O-ring portions into sealing contact with the outer member, said annular elements including at least two sleeve elements abutting against opposite sides of and axially aligned with said packer and including a spreader element disposed between the diverging legs of said V-shape in radial alignment with said one O-ring portion to lock said legs and O-ring portions in said packing assembly.

7. A packing assembly for placement in a space be tween relatively movable inner and outer members comprising, an annular packer with O-ring portions at the opposite ends of a connecting Web and with the cross sectional diameter of each Oring portion being greater than the width of its connecting web, and annular elements abutting against said packer to expand the same and urge one of said O-ring portions into sealing contact with the inner member and urge the other of said O-ring portions into sealing contact with the outer member and. to lock said web and Q-ring portions in said packing assembly, said elements having surfaces straddling and spaced from said one O-ring portion and having other surfaces straddling and contacting said other O-ring portion when the packing assembly is in assembled position.

8. A packing assembly for placement in a space between relatively movable inner and outer members comprising, an annular packer of generally V-shape in cross section with O-ring portions at the opposite ends of each leg and with the cross sectional diameter of each O-ring portion being greater than the width of its connecting leg, and annular elements abutting against said packer to expand the same radially and urge one O-ring portion into sealing contact with the inner member and urge the other O-ring portions into sealing contact with the outer memher, said annular elements including at least two sleeve elements abutting against opposite sides of and axially lock said legs and O-ring portions in said packing assembly, said sleeve elements having surfaces which diverge outward with respect to the cross sectional center of said packer and which straddle and are spaced from said one O-ring portion and having other surfaces straddling and contacting said other O-ring portions when the packing assembly is in assembled position.

9. A packing assembly for placement in a space between the longitudinal wall of a bore in an outer valve body member and an inner valve stem member which is endwise movable within the bore of the outer member comprising, an annular packer of generally V-shape in cross section with O-ring portions at the opposite ends of 'each leg and with the cross sectional diameter of each 'O-ring portion being greater than the width of its connecting leg, annular elements abutting against said packer to expand the same radially and urge one O-ring portion into sealing contact with the inner member and urge the other O-ring portions into sealing contact with the longitudinal Wall of the outer member, said annular elements including at least two sleeve elements abutting againstopposite sides of and axially aligned with said packer and including a spreader element disposed between the diverg- 8 ing legs of said V-shape such that the packer -and the spreader element are disposed between said annular elements with a tight fit to lock said legs' and O-ring portions in said packing assembly, and means for securing the packing assembly in position in the bore against axial movement therein.

10. A packing assembly constructed in accordance 'with claim 9 wherein said means comprises end plugs disposed in each end of the bore in the outer valve body member.

1,016,167 McCulloch Jan. 30, 1912 1,861,916 Hennebohle June 7, 1932 2,132,030 Hunt Oct. 4, 1938 2,397,486 Hoertz Apr. 2, 1946 2,401,377 Smith June 4, 1946 2,487,659 Lockheed Nov. 8, 1949 2,621,885 Schmitt Dec. 16, 1952 2,645,449 Gulick July 14, 1953 2,693,931 Leisy Nov. 9, 1954 FOREIGN PATENTS 571,910 Great Britain Sept. 14, 1945 606,824

Great Britain Aug. 20, 1948