CA1155034A - Reinforced plastic structure such as a valve - Google Patents
Reinforced plastic structure such as a valveInfo
- Publication number
- CA1155034A CA1155034A CA000352635A CA352635A CA1155034A CA 1155034 A CA1155034 A CA 1155034A CA 000352635 A CA000352635 A CA 000352635A CA 352635 A CA352635 A CA 352635A CA 1155034 A CA1155034 A CA 1155034A
- Authority
- CA
- Canada
- Prior art keywords
- valve
- seating
- arms
- outer body
- reinforcing fibres
- 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.)
- Expired
Links
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
- F04B39/102—Adaptations or arrangements of distribution members the members being disc valves
- F04B39/1033—Adaptations or arrangements of distribution members the members being disc valves annular disc valves
Abstract
ABSTRACT OF THE DISCLOSURE
A valve structure having a seating member defining at least one valve opening, and having an outer body portion, a centre core portion, and a plurality of arms extending from the centre core to the outer body, there being seating means formed on the outer body and the centre core for receiving valve closure means, the outer body and centre core and the arms all being formed integrally in a single homogeneous structure having groups of reinforcing fibres extending from the centre core through the radial arms into the outer body, the reinforcing fibres being embedded in and completely surrounded by a mouldable plastic resin material.
A valve structure having a seating member defining at least one valve opening, and having an outer body portion, a centre core portion, and a plurality of arms extending from the centre core to the outer body, there being seating means formed on the outer body and the centre core for receiving valve closure means, the outer body and centre core and the arms all being formed integrally in a single homogeneous structure having groups of reinforcing fibres extending from the centre core through the radial arms into the outer body, the reinforcing fibres being embedded in and completely surrounded by a mouldable plastic resin material.
Description
llSS(~34 ,;
The invention relates to self-actuating valves such as are used in compressors, and in particular, to such valves made of synthetic plastic materials.
The invention also relates to a method of manufacturing such valves, and other articles made in accordance with such methods.
BACKGROUND OF THE INVENTION
Self acting valves are used in compressors, and in other applications. Such valves simply comprise a body and a valve closure member which is spring actuated into a closed position, and is adapted to lift off its seat on a predetermined pressure differentiaI across the valve.
Such valves, particularly when used in compressors, are subjected to continuous duty operation twenty-four hou~s a day in many cases and are subject to heavy wear. The stresses imposed on such valves during operation are very considerable. As a result they break down frequently, and the replacement and maintenance of such valves is a continuous ~;
problem.
Valves of this type have always been made of metal such as steel, and are usually machined out in complex shapes _, . . . . ., .. _ _ _ __ _ ., ........ , . __ __ . ___ , . . .. . . .. . . .. . .
requiring many hours of costly machining. Consequently, they represent a substantial cost in the operation of fox example compressors. In addition, it is well known that even when manufactured o steel, ~uch valves can simply shatter in normal use. This oocurs when for example liquids or solids are entrained with the ga~es being compressed. The gases entering the valve may be m~ving at a very high velocity, and the matter entrained with such gases will also be moving at the same velo~ity. When such matter strikes an obstruction such as a valve body, the valve body is subject-ed to enormous stre~es and breaks into pieces. Such pieces then enter direct}y ~nto the cylinder, and the piston ~' ~155~34 ,~!
and cylinder become seriously damaged. As a result, the entire unit is subject to costly repair and downtime.
In addition to these disadvantages of existing valves, it is well known that the design of the porting in the valves is a critical factor in achieving the most efficient operation.
It is obvious that such porting must be arranged in the best possible fashion so as to minimize obstruction to gas flow through the ports and thus achieve the maximum efficiency in the operation of the compressor. One of the factors affecting the efficiency of such valves and valve ports is the provision of fairing or radiussing around the entrances and exits to the valve ports, and also in the provision of a valve closure member of an optimum design.
In the past, when using an all metal construction for the valve body,the radiussing of all of the valve ports, around their entrances and exits, while being desirable, has not been practical from the viewpoint of economy in view of the additional machining time involved.
For all of these reasons therefore it is desirable to manufacture the valve bQdies in an entirely different way, with machine time reduced to a minimum. In addition, it is desirable to manufacture such valve bodies out of a materlal which, in the event of the valve body becoming shattered, eg. by impact of entrained matter such as liquids and solids moving with the gases at high velocity, does not break up the pistons and score the cylinder wall~ of the compressor.
~5S~34 One proposal for an improved valve is shown in U.S.
Letters Patent No . 3,536,094. In that proposal the valve closure members were annular bodies of plastic material. The valve bodies were made of steel. Thus breakage of the closure members did not cause such serious consequences. Pieces of plastic entering the cylinders would not score the cylinder walls or damage the piston in the same way as pieces of steel. However, the valve bodies were still made of steel, and in the event that a portion of the valve body was broken, then the same consequences would follow as described above. However, this form of valve in-corporated certain inherent problems of its own. Thus the coefficient of expansion of the plastic material is three times greater than that of steel. As the valve is subjected to increases in temperature, then the annular closure members tend to expand, and do not form a perfect seal with the seating portions of the valve body.
For all of these reasons therefore, it is apparent that it is desirable to fabricate the valve body portions of the valve of some material other than steel, an~ to fabricate the valve body portions and the valve closures out of material having the same or substantially the same coefficient~ of expansion, so as to avoid the problems described above, while yet incorporating sufficient inherent stress resistance as to be`capable of with-standing the extreme stresses developed in norma~l operation.
The invention ~eeks to overcome the various disadvant-ages described above by the provision of a valve structure of the type comprising a ~eating member definina at least one valve opening therethrough, and a closure member, said seating member comprising, an outer body portion, a center core portion, a plurality of arms extending from said center core portion to ~L55~i34 s.l1d outer body portion, seatin~ means formed on said outer bo~ly portion and said centre core ~-~rtion for reception o~
saiA ~]osllre means thereon, said outer body ~ortion and centre corc~ ~ort- iOIl and said arms all bein~ formed intecJrally in a sin~31e homogeneous structure of synthetic plastic rna~ lals having reinforcing fibres extending from said centre core through said radial arms into said outer body, said reinforcinq fibres being embedded in and completely surrounded by a mould-able plastic resin material.
The invention also provides a method of manufacturinq a valve structure comprising the steps of forming at least two panels of mouldable plastic resin material, in an outline corresponding to the plan view of the valve structure, forming at least two groups of unidirectional reinforcing fibres, and arranging said at least two groups between said panels, to form a stack, with said groups of fibres intersecting one another in a central area of said valve structure, placing said stack in a mould, closing the mould and applying heat and pressure thereto, thereby to mould and form said stack into a single homogeneous structure, with 6aid fibres completely enveloped and embedded in said plastic resin material.
The invention also comprises the fabrication of other articles of manufacture in accordance with such method, and also comprises other such articlçs of manufacture.
In a further embodiment of the invention, further groups of such reinforcing fibres may be arranged around the periphery of such article.
~55~39~
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to form-ing a part of this disclosure. For a ~etter understandi~,J of the invention, its operating advantages and specific objects attained by its use, re~erence should be had to the accompanying drawings and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
IN THE DRAWING8:
Fig. 1 is a perspective illustration of a valve manufactured in accordance with the invention, partially cut away;
Fig. 2 is a section along the line2-2 of Fig. l;
Fig. 3 i8 a lower perspective of an upper portion of such valve structure Fig. 4 is a upper perspective of a lower portion of the valve structure;
Fig. 5 is a bottom plan view of the top portion of Fig. 3;
Fig. 6 is a top plan view of the bottom portion of Fig. 4;
Fig. 7 is a schematic exploded perspective view showing the assembly of the various components prior to moulding;
Fig. 8 is a schematic diagram showing the various steps and the ass~mbly and moulding of the components;
Fig. 9 is a schematic elevational view partly in section, showing the assembly of the various components in a mould;
Fig. 10 is a schematic section view in elevation showing a modification, and, Fig. 11 is a schematic top plan view of a further embodiment of the invention.
~5~3~
DF.SCRIPTION OF A SPECIFIC EI~BODlMF~'r:
. _ _ _ ___ Referring first of all to Figure 1, it will be seen that the embodiment of the invention illustrated there comprises a valve of the type suitable for u~e i~
compressors. It will be understood that such valVesare used in pairs, one valve functioning as an inlet and the other as an exhaust.They are usually placed in position in a compressor block or head (not shown) and are held in position by any suitable clamping means (not shown) which may be releas-able, so that the valves may be removed and rcplaced for servic-ing.
These features are well known in the art, and form no part of the invention and are therefore omitted for the sake of clarity.
The valve will be seen to comprise a seating portion 10, and a spring bearing portion 12, being of generally cylindrica]
shape in plan. The seating portion 10 is provided with a plural-ity of gas passageways 14, and the spring bearing portion is provided with a plurality of gas ports 16. The seating portion and spring bearing portion enclose between them two valve closure rings 18 and 20 which are of a generally annular shape in plan, and which are dimensioned and adapted to close off the passage-ways 14. The rings 18 and 20 are movable, and are held in position by means of springs 22, located in the spring bearing portion 12.
Assuming that the valve of Figure l i$ used as an intake valve in a compressor, then the valve seating portion 10 will be connected with the incoming supply of gas, and the spring bearing portion 12 will be connected with the compressor.
As the piston in the compressor causes the development of ~Ls5Q34 a reduced pressure, then the pressure difference between the gas supply, on the one side of the valve and the reduced pressure in the compressor on the other side of the valve, will cause the closur~ rings 18 and 20 to move against the springs 22, thereby opening the passageways 14 and permitting flow of gas through passageways 14 around rings 18 and 20 and into ports 16 and thus into the compressor. Continued movement of the piston will cause such gas flow to continue until such time as the cylinder is charged at which time the pressure difference will disappear, and the springs 22 will thus return the rings 18 and 20 into sealing engagement and gas flow will cease.
As explained a~ove, the velocities experienced in such valve operation are véry high. Any material entrained in such gas supply whether of a liquid or a solid nature, will impact at high speed upon either the seating portion 10 or the rings 18 and 20 or even on the spring bearing portïon 12. Such an impact frequently causes shattering of the parts. In the past, where such parts were made either wholly or partially of steel, the shattered steel fragments were carried directly into the cylinder, and damaged the piston and cylinder walls.
In the pre~ent invention, both the seating portion 10 and spring bearing portion 12 and rings 18 and 20 are made of synthetic plastic material, in a manner to be described below, so that the only metal components are in fact the springs 22.
As showm in more detail in Figures 2 to 6, the present embodiment of the invention is seen to comprise a valve seating portion 10 having a central core 24 of generally cylindrical shape, and intermediate seating ring 26, and an outer ring 28.
Outer ring 28 is provided with a stepped ~houlder 30 for reasons to be described below. The core 24, ring 26 and rina 28 are all ~:g55~3~
,i.
united together in a single integr~l structure by means of radiaL arm members 32 which extend from core 24 to inter-mediate ring 26 and then on to outer ring 28. In the embodimen-t shown,four such arms 32 are illustrated. It will however be appreciated that this is not limiting, and other numbers of such arms 32 may be provided.
It is also noted that only one intermediate ring 26 is shown. It will of course be appreciated that more such intermediate rings may be provided, concentric with one another -and concentric with core 24 if a larger valve structure is desired. On the other hand in a much smaller valve structure it may be desirable to dispense with the intermediate ring 26 altogether, in which case the radial arms 32 would simply extend from the centre core 24 to the outer ring 28.
It will also be no~ed that the radial arms 32, when viewed in section are of a reduced height in relation to the height of the centre core 24 intermediate ring 26 and outer ring 28. In this way, the core 24 and rings 26 and 28 define between them continuous annular spaces or grooves indicated as 34 and 36, and uninterrupted by the radial arms 32. The gas passageways 14 which are defined between the radial arms 32, communicate with the continuous annular grooves 34 and 36, for ~ree flow of ga~es therethrough. Angled valve seating surfaces 38 are formed on the core 24 and rings 26 and 28 as -shown for reception of the valve closure rings 18 and 20 described above. The valve cla~ures 18 and 20, are generally .
triangular in cross-~ection, having two angled upstream surfaces 40 forming a V-shape, and having a generally flat planar down-stream surface 42, for engagement by springs 22. The two upstream surfaces 40 rest on the valve seating surfaces 38, and preferably meet at an angle between about 80 and 100 degrees.
- 8~-9 lS~5~34 A substantial portion of the closure rings 18 and 20 thus extends downwardly into the annular grooves 34 and 36. The radial arms 32, being of reduced height, leave a substantial free space all around such annular grooves. In this way when the valve is open the two surfaces 40 of rings 18 and 20 smoothly divide the gases flowing through grooves 34 and 36 lnto two streams, with a minimum of turbulence, thus maximizing the efficiency of the valve.
As best shown in Figures 3 and 5, the spring bearing portion 12 of the valve is constructed on a generally similar principle to the seating portion 10. Thus it comprises a centre core portion 44, four radial arms 46 extending therefrom, ;`
and intermediate ring 48 supported by the radial arms 46, and an outer ring 50. It will be noted that the core 44 arms 46 and intermediate ring 48 are all of the same thickness in section, and that the outer ring 50 i~ of a greater thickness, defining a downwardly extending annular junction portion 52, shaped and dimensioned to fit snugly in around shoulder 30 of outer ring 28 on seating portion 10. In this way, when seating por~ion 10 and spring bearing portion 12 are ascembled as shown in Figure 2, the centre core 44 arms 46 and intermediate ring 48 are all located at a distance spaced apart from the seating portion 10, thereby defining an open area through which gas can flow, and permitting movement of the valve çlosure rlng~ 18 and 20 in response to pressure differential- thereacross as described above.
It will be noted that the gas ports 16 in spring bearing portion 12 are defined between the centre core portion 44 arms 46 intermediate ring 48 and outer ring 50,and in fact are located around three essentially circular concentric paths. Such concentric paths are generally ~pe&king off-set with respect to the annular passageways 34 and 36 of ~oating portion 10, so that gases passing upwardly therethrough and around the rings 18 and 20 may then pass ~5S~34 freely through ports 16 with a minimum of obstruction.
In order to provide additional resistanc~ to the s~resses imposed on the valve s-tructure, a c~ntral support boss 54 is provided on core 44, in a generally cruciform sh.,~,e in plan, which is adapted to engage the upper surface of centre core 24 and four further generally rectangular support bosses 56 are provided on the radial arms 46 which are adapted to engage the intermediate ring 26 at various points therearound, registering with the radial arms 32.
In order to provide a means for securing the springs 22, a plurality of spring receiving recesses 58 are formed in the core 44, being locate~ around a generally annular path corresponding to the diameter of the inner valve closure ring 18. The centre core 44 is made somewhat oversized in order that it may receive such recesses 58, and it will be noted that the recesses 58 are off-set to one side of the axis of the radial arms 46, for reasons to be described below.
In order to provide for the reception of further springs 22, spring mounting blocks 60 are supported, between intermediate ring 48 and outer ring 50, and further such blocks 62 are supported on one side of the radial arms 46, adjacent to the junction of intermediate ring 48 therewith. All of such blocks 60 and 62 are located around a generally annular path corresponding to the dia-meter of the outer valve closure ring 20, and are provided with spring receiving recesse~ 64 therein. Each of the recesses 58 and 64 is provided with a small gas vent opening. This permits gases to blow off any particle8 which may lodge in the spring reces~es.
It will be noted that the springs 22 are of a generally tapering frusto-conical shape, with the larger diameter end seating within the re~pective recesses 58 or 64, and in this way ~55~)34 the remainder of the s~ring is held out of contact with the surfaces of the recess, thereby substantially prolonging its life.
As best shown in Figures 1 and 2, the seating portion 10 and spring bearing portion 12 are assembled together with the springs 22 and rings 18 and 20 in position as shown. Preferably they are permanently bonded or otherwise fastened together, both around the surfaces of the junction portion 52 and shoulder 30, and also at the interfaces between core 24 and central bosses 54 and intermediate ring 26 and bosses 56.
As indicated above, the entire structure of the seating portions 10 and spring bearing portions 12 are made of plastic resin materials in a manner to be described below.
The plastic materials from which the valves according to the invention are manufactured are preferably those known as Sheet Moulding Compound, known in the trade as "SMC.". Such SMC materials comprise reinforcing glass fibres, in a plastic resin base. The plastic resin base is compounded with suitable catalysts,SUCh tha* at room temperatures it is relatively stable and has an extended shelf life, and is essentially solid so that it may be readily handled, and cut. However when subjected to heat, it becomes mouldable, and the catalysts are activated, so that the material rapidly sets hard. Such SMC material is thus particularly suitable for moulding under heat and pressure in a closed mould. Articles formed in this way are found to have high strength,in some cases equalling that of steel. At the same time, fragments of such material when shattered, are substantially less abrasive then fragments of steel, and thus if such fragments should enter into the cylinders of a compressor, they will do little or no damage.
~:~55~34 In the preferred form of construction, the valve body 10 and spring bearing portion ]2 of the val~e according to the invention are preferably formed of a composite of materials, essentially shown schematically in Figure 7.
Thus each such portion of the complete valve wi]l comprise upper and lower panel portions 70 and 72 of SMC
material, which may be cut into a circular disc shape as shown, or may be cut into any other desired shape for example the shape of a cross, as may be most suitable for fitting in the particular mould.
Sandwiched between the two panel portions 70 and 72 will be groups of unidirectional reinforcing fibres 74. These unidirectional reinforcing fibres may be further filaments of glass fibre material. However, preferably they will be of fibres of c~rbon, graphite, boron, aramid or even metal, or other rein-forcing fibres having a strength greater than that of glass fibres.
Each of the groups of fibres 74 will be preferably coated with liquid plastic resin material, incorporating a suitable catalysts, just prior to moulding.
~0 In order ~o provide sufficient bulk for filling all of the cavities in the mould, additional chunks 76 of SMC
material are preferably arranged in the "sandwich" between - panel portions 70 and 72.
The compo~ite of such materials is then placed in a suitable mould (see Fig. 9) and subjected to heat and pressure thereby first of all rendering the SMC material mouldable and ; flowable, and subsquently setting the pastic resin materials.
After moulding, which may take place in a 15 minute cycle for example, depending upon the composition of the SMC material, the article i9 then removed from the mould and cleaned up and any "flashing" is removed.
~55034 The steps involved in moulding of such articles are illustrated schematically with reference with Figures 8 and 9, and will be seen to comprise passing a sheet 80 of SMC material between a cutting die D, and stamping panel portions 70 and 72 therefrom in the desired shape, and subjecting the remainder of the SMC ma~terial 80 to the action of a chopper C to chop it up into random chunks 76.
Continuous lengths of unidirectional reinforcing fibres 82 are prepared by passing the same through rollers R, applying plastic resin material thereto, and subsequently cutting the same by means of knife K into bundles 74.
The lowermost panel portion 72 is then placed in the bottom of a mould M of a suitable shape. Mould M is provided with suitable heating means, in this place illustrated schemat-ically as electrical heating elements B although heating may be , . .. , ., . __ _ _ . ... ... . . .. . .
provided by other mean~ 9uch as liquids, or mould M may be placed in an oven.
The reinforcing fibres 74, having been arranged preferably in a 8uitable ~ig G (not shown) into the form of ~20 a cross, or any other suitable arrangement, are then placed in mould M and the chunks 76 of SMC material are then placed in position, more-or-lea6 as shown in Fig. 9. The upper panel portion 70 i8 then placed in position after which the upper half of the mould is then closed. The mould is then subjected to heat and pressure causing the SMC material to become sufficiently plastic that it flows into the shape of the mould, afterwhich the plaatic resin material is cured and set.
In some ~a~e~, where making valves for lower pressure compressors,or where making valves of a smaller size, it may be possible to omit the inclu8ion of th~ reinforcing fibres 74. It ~L~55034 will however be appreciated that where these reinforcing fibres 74 are incorporated, they will be completely embedded and covered by the SMC material, and will in fact form the radial arms 32, of the valve seating portion 10, or the radial arms 46 of the spring seating portion 12 respectively.
Since the reinforcing fibres 74 provide a substantial portion of the strength of the structure, the spring recesses 58 are all formed in areas which are offset with respect to the arms, in the spring seating portion 12, in the manner described above, so that the recesses 58 and 64 do not cut into such reinforcing fibres 74, which would reduce their effectiveness.
In some cases where it desired to make an even stronger valve, or where the volume of material is to be reduced for any reason, then it may be desirable to arrange the reinforcing fibres 74 in a generally curved shape as shown schematically in Figure 10. By arranginq the fibres in this manner, the effectiveness of the fibres 74 in providing additional strength is greatly increased.
~20 In certain circumstances to provide articles of even greater strength, it may be desirable to provide reinforcing fibres around the perlphery of such an article. Referring to Figure 11, a circular article, which may be considered as a valve, but may be a variety of di~ferent articles, such as a gear wheel or the like may be provided having a core 90, a plurality of radial arms 92, and an outer rim 94. As shown in Figure 11, opening3 are defined between arms 92. It will be appreciated that the structure of Figure 11 is essentially schematic, and a variety o~ different Yhapes of such an article may be designed as required.
~55034 In the construction of such article, unidirectional fibres 74 extend through the core 90 and along the radial arms 92. Additional unidirectional fibres 74a are arranged around the outer ring 94. The unidirectional fibres 74 and 74a are embedded within moulded SMC material in the manner described above, to form a single homogeneous integral article.
The foregoing is a description of a preferred embodiment of the invention which is given here by way of example only. The invention is not to be taken as limited to any of the specific features as described, but comp~ehends all such variations thereof as come within the scope of the appended claims.
:
~ - lS -
The invention relates to self-actuating valves such as are used in compressors, and in particular, to such valves made of synthetic plastic materials.
The invention also relates to a method of manufacturing such valves, and other articles made in accordance with such methods.
BACKGROUND OF THE INVENTION
Self acting valves are used in compressors, and in other applications. Such valves simply comprise a body and a valve closure member which is spring actuated into a closed position, and is adapted to lift off its seat on a predetermined pressure differentiaI across the valve.
Such valves, particularly when used in compressors, are subjected to continuous duty operation twenty-four hou~s a day in many cases and are subject to heavy wear. The stresses imposed on such valves during operation are very considerable. As a result they break down frequently, and the replacement and maintenance of such valves is a continuous ~;
problem.
Valves of this type have always been made of metal such as steel, and are usually machined out in complex shapes _, . . . . ., .. _ _ _ __ _ ., ........ , . __ __ . ___ , . . .. . . .. . . .. . .
requiring many hours of costly machining. Consequently, they represent a substantial cost in the operation of fox example compressors. In addition, it is well known that even when manufactured o steel, ~uch valves can simply shatter in normal use. This oocurs when for example liquids or solids are entrained with the ga~es being compressed. The gases entering the valve may be m~ving at a very high velocity, and the matter entrained with such gases will also be moving at the same velo~ity. When such matter strikes an obstruction such as a valve body, the valve body is subject-ed to enormous stre~es and breaks into pieces. Such pieces then enter direct}y ~nto the cylinder, and the piston ~' ~155~34 ,~!
and cylinder become seriously damaged. As a result, the entire unit is subject to costly repair and downtime.
In addition to these disadvantages of existing valves, it is well known that the design of the porting in the valves is a critical factor in achieving the most efficient operation.
It is obvious that such porting must be arranged in the best possible fashion so as to minimize obstruction to gas flow through the ports and thus achieve the maximum efficiency in the operation of the compressor. One of the factors affecting the efficiency of such valves and valve ports is the provision of fairing or radiussing around the entrances and exits to the valve ports, and also in the provision of a valve closure member of an optimum design.
In the past, when using an all metal construction for the valve body,the radiussing of all of the valve ports, around their entrances and exits, while being desirable, has not been practical from the viewpoint of economy in view of the additional machining time involved.
For all of these reasons therefore it is desirable to manufacture the valve bQdies in an entirely different way, with machine time reduced to a minimum. In addition, it is desirable to manufacture such valve bodies out of a materlal which, in the event of the valve body becoming shattered, eg. by impact of entrained matter such as liquids and solids moving with the gases at high velocity, does not break up the pistons and score the cylinder wall~ of the compressor.
~5S~34 One proposal for an improved valve is shown in U.S.
Letters Patent No . 3,536,094. In that proposal the valve closure members were annular bodies of plastic material. The valve bodies were made of steel. Thus breakage of the closure members did not cause such serious consequences. Pieces of plastic entering the cylinders would not score the cylinder walls or damage the piston in the same way as pieces of steel. However, the valve bodies were still made of steel, and in the event that a portion of the valve body was broken, then the same consequences would follow as described above. However, this form of valve in-corporated certain inherent problems of its own. Thus the coefficient of expansion of the plastic material is three times greater than that of steel. As the valve is subjected to increases in temperature, then the annular closure members tend to expand, and do not form a perfect seal with the seating portions of the valve body.
For all of these reasons therefore, it is apparent that it is desirable to fabricate the valve body portions of the valve of some material other than steel, an~ to fabricate the valve body portions and the valve closures out of material having the same or substantially the same coefficient~ of expansion, so as to avoid the problems described above, while yet incorporating sufficient inherent stress resistance as to be`capable of with-standing the extreme stresses developed in norma~l operation.
The invention ~eeks to overcome the various disadvant-ages described above by the provision of a valve structure of the type comprising a ~eating member definina at least one valve opening therethrough, and a closure member, said seating member comprising, an outer body portion, a center core portion, a plurality of arms extending from said center core portion to ~L55~i34 s.l1d outer body portion, seatin~ means formed on said outer bo~ly portion and said centre core ~-~rtion for reception o~
saiA ~]osllre means thereon, said outer body ~ortion and centre corc~ ~ort- iOIl and said arms all bein~ formed intecJrally in a sin~31e homogeneous structure of synthetic plastic rna~ lals having reinforcing fibres extending from said centre core through said radial arms into said outer body, said reinforcinq fibres being embedded in and completely surrounded by a mould-able plastic resin material.
The invention also provides a method of manufacturinq a valve structure comprising the steps of forming at least two panels of mouldable plastic resin material, in an outline corresponding to the plan view of the valve structure, forming at least two groups of unidirectional reinforcing fibres, and arranging said at least two groups between said panels, to form a stack, with said groups of fibres intersecting one another in a central area of said valve structure, placing said stack in a mould, closing the mould and applying heat and pressure thereto, thereby to mould and form said stack into a single homogeneous structure, with 6aid fibres completely enveloped and embedded in said plastic resin material.
The invention also comprises the fabrication of other articles of manufacture in accordance with such method, and also comprises other such articlçs of manufacture.
In a further embodiment of the invention, further groups of such reinforcing fibres may be arranged around the periphery of such article.
~55~39~
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to form-ing a part of this disclosure. For a ~etter understandi~,J of the invention, its operating advantages and specific objects attained by its use, re~erence should be had to the accompanying drawings and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
IN THE DRAWING8:
Fig. 1 is a perspective illustration of a valve manufactured in accordance with the invention, partially cut away;
Fig. 2 is a section along the line2-2 of Fig. l;
Fig. 3 i8 a lower perspective of an upper portion of such valve structure Fig. 4 is a upper perspective of a lower portion of the valve structure;
Fig. 5 is a bottom plan view of the top portion of Fig. 3;
Fig. 6 is a top plan view of the bottom portion of Fig. 4;
Fig. 7 is a schematic exploded perspective view showing the assembly of the various components prior to moulding;
Fig. 8 is a schematic diagram showing the various steps and the ass~mbly and moulding of the components;
Fig. 9 is a schematic elevational view partly in section, showing the assembly of the various components in a mould;
Fig. 10 is a schematic section view in elevation showing a modification, and, Fig. 11 is a schematic top plan view of a further embodiment of the invention.
~5~3~
DF.SCRIPTION OF A SPECIFIC EI~BODlMF~'r:
. _ _ _ ___ Referring first of all to Figure 1, it will be seen that the embodiment of the invention illustrated there comprises a valve of the type suitable for u~e i~
compressors. It will be understood that such valVesare used in pairs, one valve functioning as an inlet and the other as an exhaust.They are usually placed in position in a compressor block or head (not shown) and are held in position by any suitable clamping means (not shown) which may be releas-able, so that the valves may be removed and rcplaced for servic-ing.
These features are well known in the art, and form no part of the invention and are therefore omitted for the sake of clarity.
The valve will be seen to comprise a seating portion 10, and a spring bearing portion 12, being of generally cylindrica]
shape in plan. The seating portion 10 is provided with a plural-ity of gas passageways 14, and the spring bearing portion is provided with a plurality of gas ports 16. The seating portion and spring bearing portion enclose between them two valve closure rings 18 and 20 which are of a generally annular shape in plan, and which are dimensioned and adapted to close off the passage-ways 14. The rings 18 and 20 are movable, and are held in position by means of springs 22, located in the spring bearing portion 12.
Assuming that the valve of Figure l i$ used as an intake valve in a compressor, then the valve seating portion 10 will be connected with the incoming supply of gas, and the spring bearing portion 12 will be connected with the compressor.
As the piston in the compressor causes the development of ~Ls5Q34 a reduced pressure, then the pressure difference between the gas supply, on the one side of the valve and the reduced pressure in the compressor on the other side of the valve, will cause the closur~ rings 18 and 20 to move against the springs 22, thereby opening the passageways 14 and permitting flow of gas through passageways 14 around rings 18 and 20 and into ports 16 and thus into the compressor. Continued movement of the piston will cause such gas flow to continue until such time as the cylinder is charged at which time the pressure difference will disappear, and the springs 22 will thus return the rings 18 and 20 into sealing engagement and gas flow will cease.
As explained a~ove, the velocities experienced in such valve operation are véry high. Any material entrained in such gas supply whether of a liquid or a solid nature, will impact at high speed upon either the seating portion 10 or the rings 18 and 20 or even on the spring bearing portïon 12. Such an impact frequently causes shattering of the parts. In the past, where such parts were made either wholly or partially of steel, the shattered steel fragments were carried directly into the cylinder, and damaged the piston and cylinder walls.
In the pre~ent invention, both the seating portion 10 and spring bearing portion 12 and rings 18 and 20 are made of synthetic plastic material, in a manner to be described below, so that the only metal components are in fact the springs 22.
As showm in more detail in Figures 2 to 6, the present embodiment of the invention is seen to comprise a valve seating portion 10 having a central core 24 of generally cylindrical shape, and intermediate seating ring 26, and an outer ring 28.
Outer ring 28 is provided with a stepped ~houlder 30 for reasons to be described below. The core 24, ring 26 and rina 28 are all ~:g55~3~
,i.
united together in a single integr~l structure by means of radiaL arm members 32 which extend from core 24 to inter-mediate ring 26 and then on to outer ring 28. In the embodimen-t shown,four such arms 32 are illustrated. It will however be appreciated that this is not limiting, and other numbers of such arms 32 may be provided.
It is also noted that only one intermediate ring 26 is shown. It will of course be appreciated that more such intermediate rings may be provided, concentric with one another -and concentric with core 24 if a larger valve structure is desired. On the other hand in a much smaller valve structure it may be desirable to dispense with the intermediate ring 26 altogether, in which case the radial arms 32 would simply extend from the centre core 24 to the outer ring 28.
It will also be no~ed that the radial arms 32, when viewed in section are of a reduced height in relation to the height of the centre core 24 intermediate ring 26 and outer ring 28. In this way, the core 24 and rings 26 and 28 define between them continuous annular spaces or grooves indicated as 34 and 36, and uninterrupted by the radial arms 32. The gas passageways 14 which are defined between the radial arms 32, communicate with the continuous annular grooves 34 and 36, for ~ree flow of ga~es therethrough. Angled valve seating surfaces 38 are formed on the core 24 and rings 26 and 28 as -shown for reception of the valve closure rings 18 and 20 described above. The valve cla~ures 18 and 20, are generally .
triangular in cross-~ection, having two angled upstream surfaces 40 forming a V-shape, and having a generally flat planar down-stream surface 42, for engagement by springs 22. The two upstream surfaces 40 rest on the valve seating surfaces 38, and preferably meet at an angle between about 80 and 100 degrees.
- 8~-9 lS~5~34 A substantial portion of the closure rings 18 and 20 thus extends downwardly into the annular grooves 34 and 36. The radial arms 32, being of reduced height, leave a substantial free space all around such annular grooves. In this way when the valve is open the two surfaces 40 of rings 18 and 20 smoothly divide the gases flowing through grooves 34 and 36 lnto two streams, with a minimum of turbulence, thus maximizing the efficiency of the valve.
As best shown in Figures 3 and 5, the spring bearing portion 12 of the valve is constructed on a generally similar principle to the seating portion 10. Thus it comprises a centre core portion 44, four radial arms 46 extending therefrom, ;`
and intermediate ring 48 supported by the radial arms 46, and an outer ring 50. It will be noted that the core 44 arms 46 and intermediate ring 48 are all of the same thickness in section, and that the outer ring 50 i~ of a greater thickness, defining a downwardly extending annular junction portion 52, shaped and dimensioned to fit snugly in around shoulder 30 of outer ring 28 on seating portion 10. In this way, when seating por~ion 10 and spring bearing portion 12 are ascembled as shown in Figure 2, the centre core 44 arms 46 and intermediate ring 48 are all located at a distance spaced apart from the seating portion 10, thereby defining an open area through which gas can flow, and permitting movement of the valve çlosure rlng~ 18 and 20 in response to pressure differential- thereacross as described above.
It will be noted that the gas ports 16 in spring bearing portion 12 are defined between the centre core portion 44 arms 46 intermediate ring 48 and outer ring 50,and in fact are located around three essentially circular concentric paths. Such concentric paths are generally ~pe&king off-set with respect to the annular passageways 34 and 36 of ~oating portion 10, so that gases passing upwardly therethrough and around the rings 18 and 20 may then pass ~5S~34 freely through ports 16 with a minimum of obstruction.
In order to provide additional resistanc~ to the s~resses imposed on the valve s-tructure, a c~ntral support boss 54 is provided on core 44, in a generally cruciform sh.,~,e in plan, which is adapted to engage the upper surface of centre core 24 and four further generally rectangular support bosses 56 are provided on the radial arms 46 which are adapted to engage the intermediate ring 26 at various points therearound, registering with the radial arms 32.
In order to provide a means for securing the springs 22, a plurality of spring receiving recesses 58 are formed in the core 44, being locate~ around a generally annular path corresponding to the diameter of the inner valve closure ring 18. The centre core 44 is made somewhat oversized in order that it may receive such recesses 58, and it will be noted that the recesses 58 are off-set to one side of the axis of the radial arms 46, for reasons to be described below.
In order to provide for the reception of further springs 22, spring mounting blocks 60 are supported, between intermediate ring 48 and outer ring 50, and further such blocks 62 are supported on one side of the radial arms 46, adjacent to the junction of intermediate ring 48 therewith. All of such blocks 60 and 62 are located around a generally annular path corresponding to the dia-meter of the outer valve closure ring 20, and are provided with spring receiving recesse~ 64 therein. Each of the recesses 58 and 64 is provided with a small gas vent opening. This permits gases to blow off any particle8 which may lodge in the spring reces~es.
It will be noted that the springs 22 are of a generally tapering frusto-conical shape, with the larger diameter end seating within the re~pective recesses 58 or 64, and in this way ~55~)34 the remainder of the s~ring is held out of contact with the surfaces of the recess, thereby substantially prolonging its life.
As best shown in Figures 1 and 2, the seating portion 10 and spring bearing portion 12 are assembled together with the springs 22 and rings 18 and 20 in position as shown. Preferably they are permanently bonded or otherwise fastened together, both around the surfaces of the junction portion 52 and shoulder 30, and also at the interfaces between core 24 and central bosses 54 and intermediate ring 26 and bosses 56.
As indicated above, the entire structure of the seating portions 10 and spring bearing portions 12 are made of plastic resin materials in a manner to be described below.
The plastic materials from which the valves according to the invention are manufactured are preferably those known as Sheet Moulding Compound, known in the trade as "SMC.". Such SMC materials comprise reinforcing glass fibres, in a plastic resin base. The plastic resin base is compounded with suitable catalysts,SUCh tha* at room temperatures it is relatively stable and has an extended shelf life, and is essentially solid so that it may be readily handled, and cut. However when subjected to heat, it becomes mouldable, and the catalysts are activated, so that the material rapidly sets hard. Such SMC material is thus particularly suitable for moulding under heat and pressure in a closed mould. Articles formed in this way are found to have high strength,in some cases equalling that of steel. At the same time, fragments of such material when shattered, are substantially less abrasive then fragments of steel, and thus if such fragments should enter into the cylinders of a compressor, they will do little or no damage.
~:~55~34 In the preferred form of construction, the valve body 10 and spring bearing portion ]2 of the val~e according to the invention are preferably formed of a composite of materials, essentially shown schematically in Figure 7.
Thus each such portion of the complete valve wi]l comprise upper and lower panel portions 70 and 72 of SMC
material, which may be cut into a circular disc shape as shown, or may be cut into any other desired shape for example the shape of a cross, as may be most suitable for fitting in the particular mould.
Sandwiched between the two panel portions 70 and 72 will be groups of unidirectional reinforcing fibres 74. These unidirectional reinforcing fibres may be further filaments of glass fibre material. However, preferably they will be of fibres of c~rbon, graphite, boron, aramid or even metal, or other rein-forcing fibres having a strength greater than that of glass fibres.
Each of the groups of fibres 74 will be preferably coated with liquid plastic resin material, incorporating a suitable catalysts, just prior to moulding.
~0 In order ~o provide sufficient bulk for filling all of the cavities in the mould, additional chunks 76 of SMC
material are preferably arranged in the "sandwich" between - panel portions 70 and 72.
The compo~ite of such materials is then placed in a suitable mould (see Fig. 9) and subjected to heat and pressure thereby first of all rendering the SMC material mouldable and ; flowable, and subsquently setting the pastic resin materials.
After moulding, which may take place in a 15 minute cycle for example, depending upon the composition of the SMC material, the article i9 then removed from the mould and cleaned up and any "flashing" is removed.
~55034 The steps involved in moulding of such articles are illustrated schematically with reference with Figures 8 and 9, and will be seen to comprise passing a sheet 80 of SMC material between a cutting die D, and stamping panel portions 70 and 72 therefrom in the desired shape, and subjecting the remainder of the SMC ma~terial 80 to the action of a chopper C to chop it up into random chunks 76.
Continuous lengths of unidirectional reinforcing fibres 82 are prepared by passing the same through rollers R, applying plastic resin material thereto, and subsequently cutting the same by means of knife K into bundles 74.
The lowermost panel portion 72 is then placed in the bottom of a mould M of a suitable shape. Mould M is provided with suitable heating means, in this place illustrated schemat-ically as electrical heating elements B although heating may be , . .. , ., . __ _ _ . ... ... . . .. . .
provided by other mean~ 9uch as liquids, or mould M may be placed in an oven.
The reinforcing fibres 74, having been arranged preferably in a 8uitable ~ig G (not shown) into the form of ~20 a cross, or any other suitable arrangement, are then placed in mould M and the chunks 76 of SMC material are then placed in position, more-or-lea6 as shown in Fig. 9. The upper panel portion 70 i8 then placed in position after which the upper half of the mould is then closed. The mould is then subjected to heat and pressure causing the SMC material to become sufficiently plastic that it flows into the shape of the mould, afterwhich the plaatic resin material is cured and set.
In some ~a~e~, where making valves for lower pressure compressors,or where making valves of a smaller size, it may be possible to omit the inclu8ion of th~ reinforcing fibres 74. It ~L~55034 will however be appreciated that where these reinforcing fibres 74 are incorporated, they will be completely embedded and covered by the SMC material, and will in fact form the radial arms 32, of the valve seating portion 10, or the radial arms 46 of the spring seating portion 12 respectively.
Since the reinforcing fibres 74 provide a substantial portion of the strength of the structure, the spring recesses 58 are all formed in areas which are offset with respect to the arms, in the spring seating portion 12, in the manner described above, so that the recesses 58 and 64 do not cut into such reinforcing fibres 74, which would reduce their effectiveness.
In some cases where it desired to make an even stronger valve, or where the volume of material is to be reduced for any reason, then it may be desirable to arrange the reinforcing fibres 74 in a generally curved shape as shown schematically in Figure 10. By arranginq the fibres in this manner, the effectiveness of the fibres 74 in providing additional strength is greatly increased.
~20 In certain circumstances to provide articles of even greater strength, it may be desirable to provide reinforcing fibres around the perlphery of such an article. Referring to Figure 11, a circular article, which may be considered as a valve, but may be a variety of di~ferent articles, such as a gear wheel or the like may be provided having a core 90, a plurality of radial arms 92, and an outer rim 94. As shown in Figure 11, opening3 are defined between arms 92. It will be appreciated that the structure of Figure 11 is essentially schematic, and a variety o~ different Yhapes of such an article may be designed as required.
~55034 In the construction of such article, unidirectional fibres 74 extend through the core 90 and along the radial arms 92. Additional unidirectional fibres 74a are arranged around the outer ring 94. The unidirectional fibres 74 and 74a are embedded within moulded SMC material in the manner described above, to form a single homogeneous integral article.
The foregoing is a description of a preferred embodiment of the invention which is given here by way of example only. The invention is not to be taken as limited to any of the specific features as described, but comp~ehends all such variations thereof as come within the scope of the appended claims.
:
~ - lS -
Claims (16)
1. A valve structure of the type comprising a seating member defining at least one valve opening therethrough, and a closure member, said seating member comprising;
an outer body portion surrounding an inner opening;
a centre core portion located in said inner opening;
a plurality of arms extending from said center core portion to said outer body portion and joining same together, said outer body portion, centre core portion and arms defining opening means therebetween;
seating means formed on said outer body portion and said centre core portion for reception of said closure means thereon, whereby said closure means may close off flow through said opening means;
said outer body portion and centre core portion and said arms all being formed integrally in a single homogeneous structure having groups of unidirectional reinforcing fibres extending from said centre core through said radial arms into said outer body, said reinforcing fibres being embedded in and completely surrounded by a mouldable plastic resin material.
an outer body portion surrounding an inner opening;
a centre core portion located in said inner opening;
a plurality of arms extending from said center core portion to said outer body portion and joining same together, said outer body portion, centre core portion and arms defining opening means therebetween;
seating means formed on said outer body portion and said centre core portion for reception of said closure means thereon, whereby said closure means may close off flow through said opening means;
said outer body portion and centre core portion and said arms all being formed integrally in a single homogeneous structure having groups of unidirectional reinforcing fibres extending from said centre core through said radial arms into said outer body, said reinforcing fibres being embedded in and completely surrounded by a mouldable plastic resin material.
2. A valve structure as claimed in Claim 1 wherein there are at least two said arms, and said reinforcing fibres are arranged in a continuous strip from one side of said outer body through one said radial arm into said centre core through said other radial arm and into said outer body.
3. A valve structure as claimed in Claim 2 including at least three said radial arms, wherein said reinforcing fibres are arranged in at least two groups, both said groups passing through said centre core, and being arranged in at least two different layers whereby the same may form a cross.
4. A valve structure as claimed in Claim 3 wherein said mouldable plastic resin material is arranged in upper and lower layers, with said groups of reinforcing fibres enclosed and embedded therebetween.
5. A valve apparatus of the type having a valve seating portion defining a plurality of ports therethrough, arranged spaced apart from one another around a generally annular pattern and a spring bearing portion defining a plurality of passageways therein, and generally annular valve closure means located between said valve seating portion and said spring bearing portion, and springs supported in said spring bearing portion engaging said annular valve closure means and forcing same into engagement with said valve seating portion, said valve closure means being displaceable against said springs upon a predetermined pressure differential occurring thereacross, wherein the improve-ment comprises that said valve seating portion includes an outer annular seating member;
at least one intermediate annular seating member a centre seating member;
annular recesses extending between adjacent said seating members;
valve seating surfaces on said seating members on opposite sides of said annular recesses, and, a plurality of radial arms extending between said centre seating member, said intermediate seating member, and said outer seating member, and defining therebetween said ports, said ports communicating with said annular recesses, said outer seating member, said intermediate seating member and center seating member and said arms all being formed integrally in a single homogeneous structure having groups of reinforcing fibres extending from said center member through said intermediate member and said arms into said outer member, said reinforcing fibres being embedded in and completely surrounded by a mouldable plastic resin material.
at least one intermediate annular seating member a centre seating member;
annular recesses extending between adjacent said seating members;
valve seating surfaces on said seating members on opposite sides of said annular recesses, and, a plurality of radial arms extending between said centre seating member, said intermediate seating member, and said outer seating member, and defining therebetween said ports, said ports communicating with said annular recesses, said outer seating member, said intermediate seating member and center seating member and said arms all being formed integrally in a single homogeneous structure having groups of reinforcing fibres extending from said center member through said intermediate member and said arms into said outer member, said reinforcing fibres being embedded in and completely surrounded by a mouldable plastic resin material.
6. A valve apparatus as claimed in Claim 5 wherein said spring seating portion includes an outer ring member, a centre core located spaced inwardly therefrom, a plurality of radial arms extending between said outer ring member and said centre core member, a plurality of passageways located between said centre core member and said outer ring member, and a plurality of spring housing blocks, formed with spring recesses therein, for reception of spring means, said blocks being supported between said outer ring and said centre core, and supporting spring means in registration with said valve closure means.
7. A valve apparatus as claimed in Claim 6 including at least one generally annular rib member located between said outer ring member and said centre core member and supported by said radial arms, and defining together with said outer ring member and said centre core a plurality of separate passageways, and at least some of said spring block members being supported at least in part by said annular rib member.
8. A valve apparatus as claimed in Claim 7 including support boss means formed on said centre core and extending therefrom and contacting said centre seating member of said valve seating portion.
9. A valve apparatus as claimed in Claim 8 including a plurality of further support bosses located on said radial arms of said spring bearing portion and extending therefrom into contact with said intermediate seating ring member.
10. A valve apparatus as claimed in Claim 9 wherein at least some of said spring receiving block members are located in offset relation to said radial arms of said spring bearing portion whereby said spring receiving recesses do not intersect said radial arms.
11. An article of manufacture comprising;
an outer annular body portion surrounding an inner opening;
a center core portion located in said inner opening;
a plurality of arms extending from said center core portion to said outer body portion and joining same together, said outer body portion, center core portion and arms defining opening means therebetween;
said outer body portion and center core portion and said arms all being formed integrally in a single homogeneous structure having groups of reinforcing fibres extending from said center core through said radial arms into said outer body, said reinforcing fibres being embedded in and completely sur-rounded by a mouldable plastic resin material.
an outer annular body portion surrounding an inner opening;
a center core portion located in said inner opening;
a plurality of arms extending from said center core portion to said outer body portion and joining same together, said outer body portion, center core portion and arms defining opening means therebetween;
said outer body portion and center core portion and said arms all being formed integrally in a single homogeneous structure having groups of reinforcing fibres extending from said center core through said radial arms into said outer body, said reinforcing fibres being embedded in and completely sur-rounded by a mouldable plastic resin material.
12. An article as claimed in Claim 11 wherein there are at least two said arms, and said reinforcing fibres are arranged in a continuous strip from one side of said outer body through one said radial arm into said center core through said other radial arm and into said outer body.
13 An article as claimed in Claim 12 including at least three said radial arms, wherein said reinforcing fibres are unidirectional and are arranged in at least two groups, both said groups passing through said centre core, and being arranged in at least two different layers whereby at the same time may form a cross.
14. An article as claimed in Claim 11 including at least one further group of reinforcing fibres extending around said outer body and embedded therein.
15. An article as claimed in Claim 11 wherein said outer body is circular and wherein said center core is circular and concentric therewith.
16. An article as claimed in Claim 15 wherein said mouldable plastic resin material is arranged in upper and lower layers, with said groups of reinforcing fibres enclosed and embedded therein.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000352635A CA1155034A (en) | 1980-05-23 | 1980-05-23 | Reinforced plastic structure such as a valve |
| ZA00813181A ZA813181B (en) | 1980-05-23 | 1981-05-13 | Reinforced plastic structure such as a valve |
| EP81302137A EP0040930B1 (en) | 1980-05-23 | 1981-05-14 | Valve structure with seating member composed of fibre reinforced plastic resin material |
| DE8181302137T DE3160941D1 (en) | 1980-05-23 | 1981-05-14 | Valve structure with seating member composed of fibre reinforced plastic resin material |
| AT81302137T ATE4739T1 (en) | 1980-05-23 | 1981-05-14 | VALVE WITH REINFORCED PLASTIC VALVE SEAT. |
| AU70608/81A AU7060881A (en) | 1980-05-23 | 1981-05-15 | Valve seating member |
| JP7679881A JPS5718880A (en) | 1980-05-23 | 1981-05-22 | Reinforced plastic structure like as valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000352635A CA1155034A (en) | 1980-05-23 | 1980-05-23 | Reinforced plastic structure such as a valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1155034A true CA1155034A (en) | 1983-10-11 |
Family
ID=4117025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000352635A Expired CA1155034A (en) | 1980-05-23 | 1980-05-23 | Reinforced plastic structure such as a valve |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0040930B1 (en) |
| JP (1) | JPS5718880A (en) |
| AT (1) | ATE4739T1 (en) |
| AU (1) | AU7060881A (en) |
| CA (1) | CA1155034A (en) |
| DE (1) | DE3160941D1 (en) |
| ZA (1) | ZA813181B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7011111B2 (en) | 2001-11-07 | 2006-03-14 | Hoerbiger Kompressortechnik Services Gmbh | Sealing elements for compressor valves |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU632212B2 (en) * | 1991-04-08 | 1992-12-17 | Garlock Pty Ltd | Improved multiple-ring compressor valve |
| AT411257B (en) | 2001-11-07 | 2003-11-25 | Hoerbiger Kompressortech Serv | SEALING ELEMENTS FOR COMPRESSOR VALVES |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE809501C (en) * | 1949-07-21 | 1951-07-30 | Miag Vertriebs Gmbh | Valve plate |
| GB674386A (en) * | 1950-03-31 | 1952-06-25 | Compressor Accessories Ltd | Improvements in or relating to valves for fluids |
| FR1058907A (en) * | 1952-03-13 | 1954-03-19 | D Applic Mecaniques Soc Ind | Improvements to automatic shutters or valves for compressors, boosters, blowing machines and similar machines |
| GB778884A (en) * | 1954-05-31 | 1957-07-10 | Anciens Ets Brisson | Improvements in and relating to valves |
| AT275004B (en) * | 1967-03-14 | 1969-10-10 | Halle Maschf Veb | Valve plate |
| US3536094A (en) * | 1968-03-12 | 1970-10-27 | Flavious E Manley Jr | Compressor valve |
-
1980
- 1980-05-23 CA CA000352635A patent/CA1155034A/en not_active Expired
-
1981
- 1981-05-13 ZA ZA00813181A patent/ZA813181B/en unknown
- 1981-05-14 EP EP81302137A patent/EP0040930B1/en not_active Expired
- 1981-05-14 AT AT81302137T patent/ATE4739T1/en not_active IP Right Cessation
- 1981-05-14 DE DE8181302137T patent/DE3160941D1/en not_active Expired
- 1981-05-15 AU AU70608/81A patent/AU7060881A/en not_active Abandoned
- 1981-05-22 JP JP7679881A patent/JPS5718880A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7011111B2 (en) | 2001-11-07 | 2006-03-14 | Hoerbiger Kompressortechnik Services Gmbh | Sealing elements for compressor valves |
| CN100366959C (en) * | 2001-11-07 | 2008-02-06 | 赫尔比格压缩机技术服务有限公司 | Sealing element for air compressor valve |
Also Published As
| Publication number | Publication date |
|---|---|
| AU7060881A (en) | 1981-11-26 |
| EP0040930B1 (en) | 1983-09-21 |
| ZA813181B (en) | 1982-06-30 |
| DE3160941D1 (en) | 1983-10-27 |
| JPS5718880A (en) | 1982-01-30 |
| ATE4739T1 (en) | 1983-10-15 |
| EP0040930A1 (en) | 1981-12-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4526195A (en) | Reinforced plastic structure such as a valve | |
| CA1160255A (en) | Cylinder-piston device | |
| CA2709988C (en) | Direct metal laser sintered flow control element | |
| US4817969A (en) | Gasket and method of making same | |
| CN1533467B (en) | Drive for gas valve distribution mechanism | |
| US4646810A (en) | Method for the manufacture of a ceramic turbine ring integral with a metallic annular carrier | |
| CN108603501A (en) | The compressor part of increasing material manufacturing with high-strength light lattice core | |
| WO1996023154A1 (en) | Compressor valve | |
| CN101245865A (en) | Rotor valve and seal structure | |
| CA1155034A (en) | Reinforced plastic structure such as a valve | |
| JP2002527691A (en) | Pistons with pressure-dependent sealing for piston-cylinder arrangements, in particular shock absorber pistons | |
| US20130195703A1 (en) | Poppet valve assembly | |
| CN100348446C (en) | Electromagnetic actuating valve | |
| CN104033633B (en) | Spring valve module and valve assembly system and method | |
| BRPI0809621B1 (en) | valve assembly for use in the compression cylinder of a compressor, and, compressor | |
| JP4146943B2 (en) | Multi-directional valve casing made of injection molded plastic | |
| CN202691105U (en) | Open-hole valve plate type pneumatic wear-resistant double-gate valve | |
| CN2314203Y (en) | Labyrinth style high pressure differential fluid regulating valve | |
| CA1037926A (en) | Valve plate having improved suction gas flow path | |
| GB2037898A (en) | Reciprocating piston compressors | |
| US5651930A (en) | Composite fiber rotor vane | |
| CN113544381A (en) | Poppet valve, valve member of poppet valve, and method for machining valve member of poppet valve | |
| CN2106272U (en) | Sluice valve type stop valve | |
| CN212804341U (en) | Ball valve with enhancement mode seal assembly | |
| CN2173874Y (en) | Super high molecular polyethylene-metal composite structure sealing ring |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |