GB2184521A - A valve component for a frictionless guided valve - Google Patents
A valve component for a frictionless guided valve Download PDFInfo
- Publication number
- GB2184521A GB2184521A GB08531550A GB8531550A GB2184521A GB 2184521 A GB2184521 A GB 2184521A GB 08531550 A GB08531550 A GB 08531550A GB 8531550 A GB8531550 A GB 8531550A GB 2184521 A GB2184521 A GB 2184521A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- guide member
- valve closure
- closure member
- guide
- 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
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
- F04B39/1053—Adaptations or arrangements of distribution members the members being Hoerbigen valves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Check Valves (AREA)
- Valve Device For Special Equipments (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Magnetically Actuated Valves (AREA)
- Forging (AREA)
- Compressor (AREA)
- Sliding Valves (AREA)
- Valve Housings (AREA)
- Fluid-Driven Valves (AREA)
Abstract
A composite valve plate for use in a plate-type non-return valve comprises an outer valve closure member (8) having a central aperture (9) and a planar guide member (1) locatable in said central aperture (9) and being capable or providing frictionless guidance of the valve closure member (8), with said guide member (1) being locatable within said aperture (9) by location means (4, 5, 6).
Description
SPECIFICATION
A valve component for a frictionless guided valve
The present invention relatesto a valve component for use as part of a plate-type non-return valve and more particularly to a frictionless guide memberfor use with a valve closure member whereby a composite valve plate is formed. It is envisaged the valve closure member and the composite valve plate also form part ofthe present invention.
Hitherto in frictionless guided valves, valve plates are known which have been integrally formed of steel and have mainly comprised a main outer, annular valve closure portion normally provided with arcuate slots for the passage of air or other gases, and guide means located centrally ofthe valve closure portion to provide what is teemed "frictionless guidance" with said guide means leading to mounting meanswhich, in use in a valve, are clamped in position between the seat and guard ofthe valve. Hitherto known valve plates have been totally formed of steel or ifformed of another material have been integrally formed i.e. the valve closure portion and the guide therefor have been one-piece.
Proposals have been made to form valve plates of titanium or plastics material or material otherthan steel but difficulties have been encountered. With a plate formed of titanium or plastics material, a considerable reduction in the weight of the plate can be achieved which is of considerable advantage since the inertia of the plate is reduced and the operation of a valve incorporating such a plate is enhanced. However, difficulties are experienced as a result ofthe poor flexing and wear characteristics of the central guide means which has detracted from the advantages resulting from the savings in weight.
According to the present invention a guide memberfor use as part of a plate for use in a plate-type non-return valve comprises central mounting means for enabling the guide memberto be located in position in a valve, at least one resiliently flexible guide arm extending outwardly from or located outwardly of said central mounting means and leading to orjoining with outer mounting means which permits the guide member to be connected to or mounted on an outer valve closure member.
The guide memberwill be of a material such as will exhibitthe required fiexibility and wear characteristics and will normally be of steel as used in known integrally formed valve plates. The guide member will generally be flat or lie in a single plane.
The guide memberwill beofathicknesssuchasto exhibit the required resilience and flexibility and may be of a constant thickness or have reduced thickness portions to provide enhanced characteristics as may be desired. The central mounting means may be a central hub portion preferably with a central circular aperturetherein or may be formed from separate arm portions leading inwardly from an outer continuous mounting portion. The central mounting means will have locating means such as cut out portions to ensure correct location ofthe member as
is known in the central portions of known valve
plates.
The at least one flexible guide arm may extend
spirally outwardly of the central mounting means
and will run into the outer mounting means although
any other desired arrangement may be provided.
The outer mounting means will preferably be
provided with means to ensure correct position thereof relative to the valve closure member with which it iso be used and this may comprise an
outwardly extending projection which cooperates with and is locatable in a corresponding recess in the
inner periphery ofthe valve closure member.
Theoutermounting means will be such asto cooperate with means provided in the inner portion or portions of the valve closure memberto ensure adequate retention. Preferably the mounting means will comprise two arms extending circularly from the end ofthe flexible guide arm in opposite directions and terminating with a space therebetween and being sufficiently resilient in the plane of the plate so as to be engageable with a corresponding circular grooveorchannel intheinnerperipheryofthevalve closure memberwhich is provided for receiving such in the mannerofan internal circlip arrangement.Suitable apertures wili be provided on the free ends of the mounting arms to permit engagement by suitable tools such as a pair ofcirclip pliers.
The guide memberthuswill normally be integrally formed of one piece material preferably steel and be locatable in a specially formed valve closure member so as to provide forfrictionless guidance thereof in desired manner.
Also according to the present invention a valve closuremembercomprisesagenerallyannularor otherwise shaped plate memberwith through passages formed therein and having a central aperture therein for retainably receiving a guide member therein which isto providefrictionless guidanceforthe valve closure member.
The valve closure member is normally of a material of lesser density than steel and may be of any desired form and may be shaped to correspond to the valve closure portions of known integrally formed plate valve members -there being absentthe central frictionless guidance portion and mounting portion and there being provided means for enabling location of the guide member centrally of the valve closure member.
The means for permitting location ofthe guide member centrally of the valve closure member may comprise a circular groove orchannel of any desired cross-section extending around the inner periphery ofthe valve closure member and being of such a shape asto cooperate with the outer mounting means of a guide member so as to retain such therein.Ifthe guide memberwereto have on its outer periphery a number of spaced apart projections, then one arrangement for location of the guide member might be to provide slots running into a groove or channel in the inner periphery ofthe valve closure member so as to permit insertion ofthe projections into said groove or channel and retention by a twisting movement ofthe guide member relative to the valve closure member with subsequent positional retention being achieved by the locating pins etc. ofthe valve to prevent undesired dislodgement ofthe guide memberfrom the valve closure member.
Also according to the present invention a composite valve plate for use in a plate-type non-return valve comprises an outervalve closure member having a central aperture and a guide member locatable in said central aperture and being capable of providing frictionless guidance of the valve closure member, with said guide member being locatable within said aperture by location means.
The location means will preferably be inter-cooperation means on the guide member and valve closure member and preferably comprise an annulargroove or channel in the inner periphery of the valve closure member lying in the same plane as the valve closure member and into which channel or groove spring arms in the form of an internal circlip may be locatable for retention purposes. Other location means may be provided byway of projection or rivetting or bonding or otherwise securing the guide member in position in the valve closure member.
Itisofcourseimportantfortheguidememberto be retained against rotation relative to the valve closure member so as to maintain the passages in alignment with appropriate parts in the valve housing etc. and in this respect means are provided to prevent rotation ofthe guide member in the location means about a central axis transverse to the member. Stop means may comprise a radially extending projection and corresponding radially extending recess which are cooperableto prevent the mentioned rotation and may be provided on the guide member and closure member orviceversa.
The same considerations as regards resilience and flexibility and lateralstabilityoftheguidememberas exist with thefrictionless guide portions of known valve plates, for example when the guide member insert according to the present invention is made of steel or any other material suitable to provide the necessary lateral stiffness i.e. to prevent undue movement ofthe valve closure member in the plane in which it lies whilst at the same time providing the requisite resilience forfrictionless guidance with other required characteristics of, for example, long life.
It is also importantforthe guide memberto find its own central position or location concentrically within the valve and in this respect when, for example, the outer mounting means are in the form ofoppositelydirected arcuate spring arms to provide an internal circlip arrangement locatable within a groove within the central periphery ofthe aperture of the valve closure member, it is important for such spring arms to flex outwardly in opposite directions in the plane in which the member lies so that when located in the groove orchannel ofthe valve closure memberthecentral mounting means etc. ensure that the valve closure member is concentrically located within the valve housing.
it is accordingly to be appreciated that the concept of the invention enables a composite valve plate to be provided wherein the outer valve closure member may benefit from materials which enhance valve efficiency, for example, when of titanium or certain plastics material considerable weight reduction and therefore reduction in inertia is achieved whilst atthe same time providing the requisite desirable characteristics of frictionless guidance i.e. guidance without sliding contact. The guide memberwill normally be made of steel as similar or equivalentto the central frictioniess guide portions of known guide plates.It is of course to be appreciated thatthe thickness of the plate from which the guide member is made and indeed the thickness ofthe guide
member may be considerably less than the thickness ofthe valve closure memberto provide the required resilientflexibilitysomewhatalong the lines ofthe central frictionless guide portion ofknownvalve plates wherein the resilient guide arms are made of reduced thickness relative to the remainder of the valve plate.
The invention will be described further, byway of example, with reference to the accompanying drawings, in which :
Figure lisa plan view of a guide member according to the present invention;
Figure2 is a side elevation ofthe guide member of
Figure 1;
Figure 3 is a plan view of a composite valve plate according to the present invention incorporating the guide member of Figures 1 and 2 and including an outer valve closure member also according to the present invention; and
Figure 4 is a section on the line X - X of Figure 3 but with the guide member being omitted.
In Figures 1 and 2 a guide member 1 is illustrated comprising a central mounting means 2 in the form of an annular hub witch cut-outs 2a, 26 four location purposes on pins within the valve housing (not shown). The hub 2 merges via a transition portion into a resilientlyflexible spring arm or guide arm 3 which in the embodiment is concentric with the hub 2 although may in other embodiments be of spiral or other shape extension.The guide arm 3 merges via transition portion into outer mounting means 4 and 5 comprising two oppositely directed resilient spring arms4and Swhich arespirallytapered and lead to enlarged end portions 4a and 5a which have aperturestherein for receiving circlip pliersto enable the arms 4 and 5 to be moved together to permit insertion ofthe guide member within an outervalve closure member as will be described subsequently. It will be appreciated that the arms 4 and 5 have to be resiliently flexible in the plane ofthe guide member 1 and spring apart upon release ofthe circlip pliers two engage in the grooves of a valve closure member and preferablywhen in such engaged position there will be certain pressure on the groove walls to ensure some abutment contact. A projection 6 extends from one side of the guide member and is cooperable with a recess 7 in the valve closure member 8to ensure that the guide member 1 and closure member 8 do not move relative to one another once the guide member has been located so as to ensure correct alignment of the valve closure
memberwithin a valve housing.The guide member
1 inthisembodimentisformed of steel and isofa thickness and characteristic as to provide the
required resilient flexibility to ensure pliable
friction less guidance whilst providing the necessary
actual stability as is required with frictionless
guidance portions of known integrallyformed valve
plate. The guide member 1 is of constantthickness
although may be fashioned as desired.
The outer valve closure member 8 illustrated in
Figures 3 and 4 in the embodiment is made of
plastics material or may be formed of suitable metal
such as titanium to provide desired characteristics
such as lightweiaht relative to known valve plates or
at least the known outer valve closure portions of
known integrally formed valve plates. Itwill be
appreciated that the outer valve closure member
may be of any suitable arrangement to close and
open the valve ducts of a plate-type non-return valve and thus the particular arrangement is given byway of example only. The closure member8 has a central
circular aperture 9 and a continuous annual or
groove 10 is provided as location meansforthe guide member 1 and receives the resilient arms 4
and 5.A recess 7 is provided to cooperate with the
projections 6 so as to permit the guide member 1 to
be inserted in the central aperture 9 in the valve
closure member 8 and forthe arms 4 and 5 to be
located in the groove 10 but is such as to prevent
rotation of guide member 1 relative to closure
member 2 once the location has been effected.
Whilst the groove 10 in the section 4 is illustrated as
being of rectangular section such may be of any
suitable shape or may in fact be of lesser relief, i.e. of ; lesserdepth.
It will be appreciated that various modifications
and changes may be effected without departing from
the scope of the present invention. For example, in a
valve plate arrangement wherebyfrictionless l guidance or other guidance is effected by way of a guide portion being outwardly of the valve closure
portion, the same considerations as regards
composite construction and formation ofthe guide
member of one suitable material and the valve ; closure memberofanothersuitable and desirable
material may be achieved.
Also whilst the present invention is generally
related to a valve plate it is also considered to be
within the scope of the present invention to provide
an equivalent arrangement in a valve component
such as guide washers, spring plates, cushion plates,
damper plates and the like. As an example of an alternative arrangement for location ofthe guide
memberwithintheclosure member, separate ; projections may be provided on the outer surface of
the guide member almost in the form ofcastellations and be insertablevia corresponding castellated
recesses in the periphery of the central aperture of
the valve closure member leading to a groove therein or grooves therein with suitable locking
means to prevent removal possibly somewhat in a
manner of a bayonet clip arrangement Alternatively projections or rivets may be provided for the location
and securement.
As a further development ofthe inventive concept of the present invention a composite valve plate comprises an integ rally formed metal plate part having an outer portion encapsulated, embedded or otherwise bonded to a plastics material or other material of lesser density than that of the metal from which said plate is composed and an inner portion comprising central mounting means and at least one resiliently flexible guide arm extending outwardly from or located outwardly of said central mounting means and joining with the outer plate portion; said outer plate portion corresponding in shapeto a valve closure portion or otherwise extending from said central portion to act as interconnection means with said plastics material which is shaped so as to form the valve closure part ofthe plate. This development ofthe concept enables the weight of the valve plate to be reduced relative to known valve plates formed wholly of metal whilst taking advantage ofthe desirable characteristics of resilience, flexibility and long life enjoyed by the friction less guidance of metal plates i.e. normally of steel. The metal plate part may be formed in the shape of a known valve plate but with at least the valve closure portion being of considerably reduced thickness relative to known plates thereby achieving considerable weight reduction. The plastics material may be integrally moulded around the outer plate portion or form a laminate with two annular sheets bonded either side of the outer plate portion and forms the valve closure portion.
Claims (26)
1. A composite valve plate for use in a plate-type non-return valve comprises an outer valve closure member having a central aperture and a guide member locatable in said central aperture and being capable of providing friction less guidance ofthe valve closure member, with said guide member being locatable within said aperture by location means.
2. Acompositevalve plate as claimed in claim 1, in which the location means comprises inter-cooperation means on the guide member and valve closure member.
3. Acompositevalve plate as claimed in claim 2, in which the location means comprises an annular groove orchannel in the inner periphery ofthe valve closure member lying in the same plane as the valve closure member and into which channel or groove spring arms ofthe guide member in the form of an internal circlip may be locatable for retention purposes.
4. A composite valve plate as claimed in any of claims 1 to 3, in which means are provided to prevent rotation ofthe guide member in the location means about a central axis transverse to the member.
5. A composite valve plate as claimed in claim 4, in which the rotation prevention means comprise stop means intheform of a radially extending projection and corresponding radially extending recess which are cooperable to prevent the mentioned rotation and are provided respectively on the guide member and located within the valve housing.
6. A composite valve plate as claimed in any of claims 1 to 5 wherein the outer valve closure member is of a material which enhances valve efficiency, for example, is of titanium or certain plastics material, to achieve considerable weight reduction and therefore reduction in inertia, whilst the guide member is made of steel similar or equivalentto the central frictionless guide portions of known guide plates.
7. A composite valve plate as claimed in any of claims 1 to 6, in which the thickness ofthe guide member is considerably less than the thickness of the valve closure memberto provide the required resilientflexibility.
8. Aguide memberfor use as part of a platefor use in a plate-type non-return valve comprising central mounting meansfor enabling the guide member to be located in position in a valve, at least one resiliently flexible guide arm extending outwardlyfrom or located outwardly of said central mounting means and leading to orjoining with outer mounting means which permits the guide member to be connected to or mounted on an outervalve closure member.
9. A guide member as claimed in claim 8, which is made of a steel having characteristics of the spring arms as used in known integrally formed valve plates and/or the valve closure member is of plastics material or titanium or other material which provides a valve closure member of less weight compared with an identical member of steel as used in valve plates hitherto.
10. A guide member as claimed in claim 8 or9, which is generally flat or lies in a single plane.
11. A guide member as claimed in any of claims 8 to 10, in which the central mounting means is a central hub portion.
12. Agujdememberas claimed in claim Il,in which the central hub portion has a central circular aperturetherein or its formed from separate arm portions leading inwardly from an outercontinuous mounting portion.
13. Aguide member as claimed in any of claims8 to 12, in which the central mounting means has locating means such as cut out portions to ensure correct location ofthe member in a valve.
14. A guide member as claimed in any of claims 8 to 13 in which the at least one flexible guide arm extends spirally outwardly of the central mounting means, which is a central hub portion, and the arm runs into the outer mounting means.
15. Aguide member as claimed in any of claims8 to 14, in which the outer mounting means is provided with means to ensure correct position thereof relative to the valve closure memberwith which it is to be used.
16. Aguidememberasclaimedinclaim 15in which the correct positioning means comprises an outwardly extending projection which cooperates with and is locatable in a corresponding recess in the inner periphery ofthe valve closure member
17. A guide member as claimed in any of claims 8 to 16 in which the outer mounting means are such as to cooperate with means provided in the inner portion or portions ofthe valve closure memberto ensure adequate retention.
18. A guide member as claimed in any of claims 8 to 17 in which the mounting means comprises two arms extending circularly from the end oftheflexible guide arm in opposite directions and terminating with a space therebetween and being sufficiently resilient in the plane of the plate so as to be engageable with a corresponding circular groove or channel in the inner periphery of the valve closure member which is provided for receiving such in the manner of an internal circlip arrangement.
19. Aguide member as claimed in claim 18, in which apertures are provided on the free ends ofthe mounting arms to permit engagement by a suitable tool.
20. A valve closure member comprising a generally annular or otherwise shaped plate memberwith through passages formed therein and having a central aperture therein for retainably receiving therein a guide member with which it is to be used and which guide member is to provide frictionless guidanceforthe valve closure member.
21. Avalve closure member as claimed in claim 20, which is of a material of lesser density than steel.
22. Avalve closure memberas claimed in claims 20 or 21, in which there are provided means for enabling location of the guide member centrally of the valve closure member.
23. Avalve closure member as claimed in claim 22, in which the means for permitting location ofthe guide member centrally of the valve closure member comprises a circular groove or channel of any desired cross-section extending around the inner periphery ofthe valve closure member and being of such a shape asto cooperate with the outer mounting means of a guide memberwith which itis to be used so as to retain such therein.
24. Avalve closure member as claimed in claim 22, in which, where the means for permitting location oftheguide membercentrallycomprisesa number of spaced apart projections on the outer periphery, one arrangementfor location of the guide member comprises the provision of slots running into a groove or channel in the inner periphery ofthe valve closure member so asto permit insertion ofthe projections into said groove or channel and retention by a twisting movement of the guide member relative to the valve closure memberwith subsequent positional retention being achieved by the locating pins etc. of the valve to prevent undesired dislodgement of the guide memberfrom the valve closure member.
25. A composite valve plate comprising a guide member as ciaimed in any of claims 8 to 18 in combination with a valve closure member as claimed in any of claims 20 to 24.
26. A guide member or valve closure member or composite valve plate substantially as herein described with reference to the accompanying drawings.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8531550A GB2184521B (en) | 1985-12-21 | 1985-12-21 | A valve component for a frictionless guided valve |
| EP19870900197 EP0287564B1 (en) | 1985-12-21 | 1986-12-11 | A valve component for a frictionless guided valve |
| PCT/GB1986/000756 WO1987003934A1 (en) | 1985-12-21 | 1986-12-11 | A valve component for a frictionless guided valve |
| AU67714/87A AU612107B2 (en) | 1985-12-21 | 1986-12-11 | A valve component for a frictionless guided valve |
| AT87900197T ATE80702T1 (en) | 1985-12-21 | 1986-12-11 | VALVE PART FOR SMOOTHLY GUIDED VALVE. |
| DE8787900197T DE3686770T2 (en) | 1985-12-21 | 1986-12-11 | VALVE PART FOR SMOOTH VALVE. |
| CA000525738A CA1285849C (en) | 1985-12-21 | 1986-12-18 | Valve component for a frictionless guided valve |
| IN937/CAL/86A IN166745B (en) | 1985-12-21 | 1986-12-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8531550A GB2184521B (en) | 1985-12-21 | 1985-12-21 | A valve component for a frictionless guided valve |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8531550D0 GB8531550D0 (en) | 1986-02-05 |
| GB2184521A true GB2184521A (en) | 1987-06-24 |
| GB2184521B GB2184521B (en) | 1990-06-06 |
Family
ID=10590131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8531550A Expired - Fee Related GB2184521B (en) | 1985-12-21 | 1985-12-21 | A valve component for a frictionless guided valve |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0287564B1 (en) |
| AT (1) | ATE80702T1 (en) |
| AU (1) | AU612107B2 (en) |
| CA (1) | CA1285849C (en) |
| DE (1) | DE3686770T2 (en) |
| GB (1) | GB2184521B (en) |
| IN (1) | IN166745B (en) |
| WO (1) | WO1987003934A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT403190B (en) * | 1988-01-19 | 1997-11-25 | Burckhardt Ag Maschf | VALVE KIT FOR PISTON COMPRESSORS |
| AT507232B1 (en) * | 2008-08-28 | 2011-11-15 | Salzgeber Peter | VALVE PLATE |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT401550B (en) * | 1993-02-15 | 1996-09-25 | Hoerbiger Ventilwerke Ag | DISC VALVE, ESPECIALLY FOR COMPRESSORS |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE628685C (en) * | 1936-04-14 | Hoerbiger & Co | Ring valve with handlebar guidance | |
| US1615279A (en) * | 1924-01-23 | 1927-01-25 | Iversen Lorenz | Valve |
| GB319498A (en) * | 1928-09-28 | 1929-09-26 | Ingersoll Rand Co | Improvements in or relating to plate valves |
| GB450069A (en) * | 1935-06-01 | 1936-07-09 | Alfred Hoerbiger | An improvement in or relating to annular valves |
| DE722156C (en) * | 1938-10-30 | 1942-07-03 | Karl Rud Dienes Fa | Ring plate valve |
| US3070122A (en) * | 1960-04-04 | 1962-12-25 | Chrysler Corp | Compressor intake valve |
| AT243420B (en) * | 1963-05-08 | 1965-11-10 | Enfo Grundlagen Forschungs Ag | Multi-ring valve |
| US4039002A (en) * | 1976-05-28 | 1977-08-02 | Broyan Fred K | Gas compressor valve |
-
1985
- 1985-12-21 GB GB8531550A patent/GB2184521B/en not_active Expired - Fee Related
-
1986
- 1986-12-11 EP EP19870900197 patent/EP0287564B1/en not_active Expired - Lifetime
- 1986-12-11 AT AT87900197T patent/ATE80702T1/en not_active IP Right Cessation
- 1986-12-11 DE DE8787900197T patent/DE3686770T2/en not_active Expired - Fee Related
- 1986-12-11 AU AU67714/87A patent/AU612107B2/en not_active Ceased
- 1986-12-11 WO PCT/GB1986/000756 patent/WO1987003934A1/en active IP Right Grant
- 1986-12-18 CA CA000525738A patent/CA1285849C/en not_active Expired - Fee Related
- 1986-12-22 IN IN937/CAL/86A patent/IN166745B/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT403190B (en) * | 1988-01-19 | 1997-11-25 | Burckhardt Ag Maschf | VALVE KIT FOR PISTON COMPRESSORS |
| AT507232B1 (en) * | 2008-08-28 | 2011-11-15 | Salzgeber Peter | VALVE PLATE |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0287564A1 (en) | 1988-10-26 |
| DE3686770T2 (en) | 1993-02-25 |
| CA1285849C (en) | 1991-07-09 |
| WO1987003934A1 (en) | 1987-07-02 |
| GB8531550D0 (en) | 1986-02-05 |
| AU6771487A (en) | 1987-07-15 |
| DE3686770D1 (en) | 1992-10-22 |
| EP0287564B1 (en) | 1992-09-16 |
| ATE80702T1 (en) | 1992-10-15 |
| IN166745B (en) | 1990-07-14 |
| GB2184521B (en) | 1990-06-06 |
| AU612107B2 (en) | 1991-07-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20031221 |