EP0208814A1 - A valving element for a plate-type valve - Google Patents
A valving element for a plate-type valve Download PDFInfo
- Publication number
- EP0208814A1 EP0208814A1 EP85304491A EP85304491A EP0208814A1 EP 0208814 A1 EP0208814 A1 EP 0208814A1 EP 85304491 A EP85304491 A EP 85304491A EP 85304491 A EP85304491 A EP 85304491A EP 0208814 A1 EP0208814 A1 EP 0208814A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plate
- given
- apertures
- periphery
- centre
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
- F04B39/1053—Adaptations or arrangements of distribution members the members being Hoerbigen valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Check Valves (AREA)
- Compressor (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
Description
- This invention pertains, specifically, to valving elements, and generally to valves within which such elements function, such as the valves used in reciprocating gas compressors. These valves are essentially one-way devices allowing gas flow in a single direction. They (i.e., the valving elements therein) respond to pressure differences across them and, commonly, closing springs are used to assist the valving elements therein in closing at a particular time relative to the compressor cycle.
- Valving elements come in a variety of types, and the particular one addressed by this disclosure is of the plate type well known in the prior art. Exemplary thereof are the plate-type valving elements in the "Plate Valve" disclosures in U.S.-A- 3,327,731 and 3,703,912, issued to T.K. Kehler, and F. Bauer, et al, respectively, on 27 June 1967 and 28 November 1972. Each of such valving elements, essentially, is a series of concentric rings joined together by webs and strengthened by radial ligaments. They can range in diameter from approximately three inches up to twelve inches, and have a typical plate thickness of .080 inches.
- Valving elements in plate-type valves cycle as high as twenty times per second with total lifts of approximately .060 inches. Typically, impact velocities thereof, at the valve seat, are in the four to eight feet per second range although, in some cases, impacts in excess of ten feet per second have been measured. Impact of the valving element with the valve seat has been shown, experimentally, to produce high stresses in the outer rim near the theradjacent flow port(s). Typically, the valving element approaches the valve seat in a tilted manner. Contact then takes place over a small area, i.e., a point contact of the valving element periphery, causing bending. Eventually, the valving element plate material fatigues, and a crack develops, forcing the machine (i.e., gas compressor) to be shut down for repairs to be made.
- It is an object of this invention to disclose a valving element for a plate-type valve which is not subject to early fatigue, failure and fracture. It is also an object of this invention to set forth a valving element for a plate-type valve, comprising a plate; said plate having (a) apertures formed therein for the conduct of fluid therethrough, (b) a given centre and (c) an outer periphery defining the outermost edge of said plate; wherein said apertures subtend given arcs drawn from said given oentre; and given ones of said apertures each have a first portion intermediate the length thereof which is more proximate to said edge than are other portions thereof which subsist at either sides of said first portion.
- It is further an object of this invention to disclose a valving element for a plate-type valve, comprising a plate; said plate having (a) apertures formed therein for conduct of fluid therethrough, (b) a given centre, and (c) an outermost periphery; and wherein said periphery is defined, at least in part, by a plurality of radii drawn from radial centres which are spaced apart from said given centre.
- Further objects of this invention, as well as the novel features thereof, will become more apparent by reference to the following description taken in conjunction with the accompanying figures, in which:-
- Figure 1 is a plan view of a prior art, plate-type, valving element similar to those in the cited U.S. patents;
- Figures 2A and 2B are (a) a partial plan view of an edge of such a prior art, valving element, and (b) an illustration in simple line drawing of such a plate approaching contact with its valving plate, the angle of incidence being shown in exaggeration only to clarify the matter;
- Figures 3A and 3B are illustrations, generally corresponding with Figures 2A and 2B, representing the valving element (of Figures 2A and 2B) upon its having made contact with the valve seat, and showing a fatigue fracture occurring therein;
- Figure 4 is a plan view of a first embodiment of the valving element, according to the invention;
- Figure 5 is a greatly enlarged plan view of a portion of the valving element of Figure 4;
- Figures 6 and 7 are plan views, similar to that of Figure 5, depicting alternate embodiments of the invention; and
- Figure 8 is a plan view of the first embodiment of the invention, again with geometric reference lines superimposed thereon.
- As shown in Figs. 1 to 3, known plate-
type valving elements 10 commonly comprise aplate 12 having a circular edge orperiphery 14, and having a plurality of apertures, orflow ports 16, formed therethrough, theperiphery 14 and theflow ports 16 being concentric about theradial centre 18 of theplate 12. The apertures, orflow ports 16, are spaced in the radial direction bywebs 20, and in the circumferential direction by radially extendingligaments 22. Thewebs 20 andligaments 22 strengthen the plate. In use, theplates 12 are commonly cycled at a high rate, and almost always impact on the complementary valve seat at an angle. Consequently, inwardly of the point of contact, bending occurs. Too soon, the plate metal fatigues and experiences afracture 24, usually through an area adjacent an end of a radially-outermost flow port 16. - In order to render such valving elements more durable and long-lived, the invention contemplates the strengthening thereof adjacent the ends of the
outermost flow ports 16, by spacing at least one end of suchoutermost flow ports 16 a greater distance from theperiphery 14 than the radial spacing of an intermediate part of such outermost flow passages from the periphery. This is achieved in one embodiment by configuring the periphery of the plate as a plurality of arcuate portions joined by rectilinear edge portions, the arcuate edge portions having a radius of curvature less than that of the arcuate flow apertures. This results in aplate 12a having an undulated orscalloped periphery 14a, as shown in the embodiment of Figs. 4 and 5. Therectilinear edge portions 26 avoid point-contact impacts. It can be seen that theoutermost flow ports 16 are substantially in parallel with most adjacent,flat edge sections 26 of theperiphery 14a of theplate 12a. Theoutermost ports 16 are spaced between byarcuate sectors 28 which are substantially devoid of flow ports;sectors 28, for example, encompass areas subsisting between points "A" and "B", "C" and "D", and "E" and "F", andradius origins 30. - The
flow ports 16 subtend the angles "I", "II", "III" and, in fact, are concentric with theradial centre 32 of theplate 12a. Thesectors 28, however, are drawn on foreshortened radii from theorigins 30. Hence, they define plate portions, between theoutermost ports 16, which are like extendinglobes 34. By way of understanding a feature of the invention, eachoutermost port 16 may be considered to be subdivided into sections "a" through "e". The centre section "a", as can be seen, is more proximate to the edge orperiphery 14a of theplate 12a than are the terminal sections "d" and "e". Increased spacing from theperiphery 14a, for sections "d" and "e" is provided, therefore, by thearcuate sectors 28 orlobes 34 thereof, which, due to their foreshortened radii, define some of the undulation of theperiphery 14a. - Each of the
outermost ports 16 has a pair ofsurfaces straight line 38 drawn therebetween. Thisline 38 may also be regarded as a chord to the arcuate inner edge of theoutermost ports 16.Lines 38 are parallel with the thereadjacentflat edge sections 26 of theperiphery 14a, in thatsuch sections 26 are linear.Sections 26 obtain between peripheral points "B" and "C", and "E" and "A"; further ones thereof extend from points "D" and "F". - The ends of the
outermost ports 16, then, which were at risk in prior art, plate-type valving elements, are considerably more inboard of theperiphery 14a in this embodiment of the invention. Such ends enjoy a greater,protective width 42 of plate material to isolate them from impacting shocks, and the latter shocks are more readily dissipated through thethereadjacent sectors 28. As for the greater, intermediate portions of theoutermost ports 16, they too are less subject to damaging shock. The thereadjacentlinear sections 26 can only effect a line contact, upon impactingly closing on a complementary valve seat (or stop plate). This defines a marked improvement over prior art valving elements which, for being wholly arcuate about the periphery thereof, unavoidably must sustain localized, point-contact impacts. - The
plate 12a has a maximumoutside diameter 44, defined by thesectors 28 orlobes 34, and represented by a broken line, as well as a minimumoutside diameter 46, defined by thesections 26, and represented by a further broken line. The configuration of theplate 12a, then, comprises portions defined in part bysectors 28 orlobes 34 which are addendums to the minimumoutside diameter 46, and portions defined in part by thesections 26 which are dedendums from the maximumoutside diameter 44. - An alternative embodiment of the invention is shown in Figure 6, which is a fragmentary view, similar to Figure 5. Here too, the
outermost flow ports 16a of theplate 12b are arcuate but in this case they are of a lesser radius of curvature so that instead of being concentric formed through arcs drawn fromradial centres 48 which are about the centre 32a of the plate each is concentric about aseparate centre 48 spaced radially outward from the radial centre 32a of theplate 12b. It is preferred that thecentres 48 be equally spaced from the centre 32a. By this teaching, thevalve plate 12b may have a circular configuration of theperiphery 14b, concentric about the centre 32a, although the ends of theoutermost ports 16a are spaced further from the periphery than an intermediate portion thereof so that these ends are protected from early fatigue and failure. Theports 16a have an arc of narrower angle and thus provide the increased radial dimension 42a between the outer ends thereof and a proximity thereof to theouter periphery 14b which would obtain ifports 16a were concentric with centre 32a. To revert to Figure 1, such more narrowlyradiused ports 16a (as provided by this invention), and theirradial centres 48, are shown, thereon, in two locations, byports 16a depicted by broken or phantom lines. Thus it can be appreciated how simply the prior art valving elements can easily be improved by a practice of the invention. - As explained, and as shown in Figure 5,
plate 12a is so configured as to define an improved, increased spacing, of both of the ends, i.e. sections "d" and "e", ofoutermost ports 16 from the edge orperiphery 14a. Thelobes 34, however, defining the addendums to thediameter 46, extend further than thewidth 42 thereof obtaining at the port ends. The further alternative embodiment shown in Figure 7, comprises aplate 12c in which the maximum width afforded by thelobes 34 is used to protect first ends of theoutermost ports 16. - The Figure 7 embodiment has the lobes 34' and linear sections 40 slightly rotated, relative to the
outermost ports 16. Accordingly, first ends, i.e., sections "e", of the latter ports are substantially in the midplane of thesectors 28. Sections "e", of the outermost ports, then, are at amaximum width 42b from the periphery 14c of theplate 12c. Second ends, i.e., sections "d" of theoutermost ports 16, are spaced apart from the periphery 14c no further, perhaps, than in the prior art plates. However, the latter ends or sections "d" subsist in approximately the midplane of the peripheral linear sections 40. Consequently, impacts are borne there along a line contact, and the impacting shock is more widely dispersed. - The geometric definitions of the invention are critical to its superior durability. Accordingly, to enhance the disclosure and its clarity, Figure 8 is provided. The latter corresponds to the first embodiment, as depicted in Figures 4 and 5. As shown in Figure 8,
plate 12a has a first, central,circular area 50 having an outer circumference 52; the latter is represented by a phantom circle, and is drawn from theplate centre 32 on a given radius.Plate 12a, then, has a second, outer,annular area 54 which is integral with, and in circumscription of,first area 50. Theradius origins 30 of thesectors 28 are traversed by the circumference 52, and thesectors 28, as depicted, are spaced apart from each other. - Each of the
sectors 28 is bounded by anarc 56 which is a portion of an imaginary circle 58 (two of which circles are represented in phantom).Arcs 56, ofadjacent sectors 28, orlobes 34, bisect atpoints 60 inarea 54. Then,radial lines 62, drawn radially outward from thecentre 32, and throughpoints 60, traverse the outermost apertures or flowports 16.Lines 62 subdivide these flow ports, traversing the midpoint of the length thereof. - The
arcs 56 extend through approximately fifty degrees, and on opposite sides of each they merge into tangency with the interveninglinear sections 26 of theperiphery 14a. - It will be appreciated that the invention provides a valving element for a plate-type valve comprising a plater having flow apertures which are elongate about a given centre of the plate characterised in that at least one of the periphery of the plate and the outermost of the flow apertures considered radially of said centre is configured to provide a greater spacing between at least one end of such outermost apertures and the periphery of the plate than is provided between an intermediate part of said apertures and said periphery.
- With advantage the outermost apertures are arcuate and concentric about said centre, the periphery of the plate is configured as a plurality of spaced rectilinear edge portions joined by arcuate portions having a radius of curvature less than said outermost apertures, said at least one end of the outermost apertures lies on a radius with respect to said centre which intersects a peripheral arcuate portion and said intermediate portion lies on a radius which intersects a peripheral rectilinear edge portion.
- Preferably both ends of the outermost apertures lie on radii with respect to said centre one of which radii intersects a first peripheral arcuate position and the second of which radii intersects a second peripheral arcuate portion.
- In an alternative embodiment the periphery of the plate is circular about the centre and the outermost apertures are arcuate to a radius of curvature less than that of the periphery.
Claims (25)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/570,949 US4532959A (en) | 1984-01-16 | 1984-01-16 | Valving element for a plate-type valve |
AT85304491T ATE55175T1 (en) | 1985-06-24 | 1985-06-24 | VALVE ELEMENT FOR PLATE VALVE. |
EP85304491A EP0208814B1 (en) | 1985-06-24 | 1985-06-24 | A valving element for a plate-type valve |
DE8585304491T DE3579005D1 (en) | 1985-06-24 | 1985-06-24 | VALVE ELEMENT FOR PLATE VALVE. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP85304491A EP0208814B1 (en) | 1985-06-24 | 1985-06-24 | A valving element for a plate-type valve |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0208814A1 true EP0208814A1 (en) | 1987-01-21 |
EP0208814B1 EP0208814B1 (en) | 1990-08-01 |
Family
ID=8194269
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85304491A Expired EP0208814B1 (en) | 1984-01-16 | 1985-06-24 | A valving element for a plate-type valve |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0208814B1 (en) |
AT (1) | ATE55175T1 (en) |
DE (1) | DE3579005D1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE687507C (en) * | 1936-12-19 | 1940-01-31 | Laszlo Szigeth Dipl Ing | Automatic valve, especially for compressors |
FR860126A (en) * | 1939-06-10 | 1941-01-07 | New valve | |
FR2030739A5 (en) * | 1969-04-02 | 1970-11-13 | Bosch | |
GB1287164A (en) * | 1970-04-28 | 1972-08-31 | Enfo Grundlagen Forschungs Ag | Improvements in or relating to piston compressors |
US3792718A (en) * | 1971-02-19 | 1974-02-19 | Hoerbiger Ventilwerke Ag | Plate valve assembly |
US4532959A (en) * | 1984-01-16 | 1985-08-06 | Ingersoll-Rand Company | Valving element for a plate-type valve |
-
1985
- 1985-06-24 DE DE8585304491T patent/DE3579005D1/en not_active Expired - Lifetime
- 1985-06-24 AT AT85304491T patent/ATE55175T1/en not_active IP Right Cessation
- 1985-06-24 EP EP85304491A patent/EP0208814B1/en not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE687507C (en) * | 1936-12-19 | 1940-01-31 | Laszlo Szigeth Dipl Ing | Automatic valve, especially for compressors |
FR860126A (en) * | 1939-06-10 | 1941-01-07 | New valve | |
FR2030739A5 (en) * | 1969-04-02 | 1970-11-13 | Bosch | |
GB1287164A (en) * | 1970-04-28 | 1972-08-31 | Enfo Grundlagen Forschungs Ag | Improvements in or relating to piston compressors |
US3792718A (en) * | 1971-02-19 | 1974-02-19 | Hoerbiger Ventilwerke Ag | Plate valve assembly |
US4532959A (en) * | 1984-01-16 | 1985-08-06 | Ingersoll-Rand Company | Valving element for a plate-type valve |
Also Published As
Publication number | Publication date |
---|---|
DE3579005D1 (en) | 1990-09-06 |
EP0208814B1 (en) | 1990-08-01 |
ATE55175T1 (en) | 1990-08-15 |
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