baber/WOPTO huggingface dataset:
Patent IT-1207633-B (IT)
Title: Automatic silo for automobiles - has superposed, side-by-side, mutually opposite and facing compartments into which vehicles are fed by robot carriage
Inventor: BRAGAGLIA GIORGIO
IPC: B66C/
Filed: 1987-03-11
Granted: 1989-05-25
Abstract: The longer dimension of the compartments (14) is parallel to the longitudinal direction of the service corridor (Z). The elevator unit mounted on the trans elevator tower (44) is provided with telescopic structures which may be extended in cantilever fashion from either side of the trans elevator to introduce the vehicles into and withdraw them from any one of the selected compartments. This is achieved by translating the vehicles normally to their longitudinal axis and by supporting the vehicles by their wheels. The arrangement is such as to displace the vehicles longitudinally during the ensilage and de-ensilage steps.
Patent IT-1225159-B (IT)
Title: Device designed especially for turning commutators coupled with motor rotors
Inventor: GUITTI GIANBATTISTA
IPC: B23B/
Filed: 1988-10-19
Granted: 1990-11-02
Abstract: The invention concerns a device for turning electric motor commutators in particular; it uses two opposed tools mounted on a turret that can also move at right angles to the axis of rotation of the workpiece in order to bring them alternatively into the machining position. When one tool is operating, the workpiece rotates in one direction, when the opposite tool operates, the workpiece is rotated in the opposite direction. In this way, roughing and finishing operations can be done by turning in opposite directions to reduce the formation of ridges near the commutator bars.
Patent LV-12704-B (LV)
Title: Process for producing colored emblems and labels
Inventor: SCIPERS VIKTORS
IPC: C09D127/06
Filed: 2000-01-26
Abstract: The present invention relates to field of producing multicoloured labels and emblems. The mentioned process could be realised by using cloth as base, for the greatest part it could be realised with a view to make stripes and insignia for uniforms. The described process provides a basis for multicolour composition of picture as well as elevated mechanical durability and decorative shape. In accordance with mentioned process the picture applying to material must be made preliminary in matrix using foliated coating on the picture polymeric compositional paints in needed composed matter. After coating each paint must be dried separately. It could be used as a base in one or more layer either cloth or thermoplastic film and adhesive lining. The said base is taken on the matrix and could be pressed during 1 to 5 minutes under pressure of 60 to 130 kg/cm2 at the temperature of 120 to 150 0C.
Patent NO-139713-B (NO)
Title: Stabilisert antenneplattform
Inventor: BRUNVOLL GEIR
IPC: H01Q1/18
Filed: 1974-03-04
Abstract: Stabilisert antenneplattform.
Patent NO-159561-B (NO)
Title: Stabilisert reagens og proeveinnretning for paavisning av naervaer av sukker i en proeve.
Inventor: MAGERS THOMAS ANTHONY
IPC: C12Q1/26
Filed: 1980-10-29
Abstract: Sammensetning og prøveinnretning for påvisning av nærvær av sukker i en prøve. Sammensetningen omfatter en sukkeroksydase, peroksydase, en kromogen forbindelse istand til å danne et synlig svar i nærvær av hydrogenperoksyd og peroksydase og en forsterker-forbindelse med strukturen. hvori R er like eller forskjellige, og betyr hydrogen, lavere alkyl, lavere alkyloksy, aryl eller aryloksy; eller hvor de to nevnté R substituentene bundet til et felles atom, sammen danner en lukket ring med fra 3-6 karbonatomer, idet ringen er mettet, umettet eller aromatisk. R' er hydrogen eller alkyl eller alkenylgruppe med fra 1-20 karbonatomer. Sammensetningen kan inkorporeres i en bærematrix for å. danne en prveinnretning. Metoden omfatter å berre prøver med sammensetningen eller prveinnretningen og iaktta et synlig svar.
Patent NO-164764-B (NO)
Inventor: NAESLUND JAN INGEMAR
IPC: B65D33/16
Filed: 1985-03-25
Abstract: A bag clip for tightly sealing plastic bags. The bag clip comprises two limbs (1, 2) hinged together at respective one ends thereof and intended to receive therebetween that portion of the bag where a seal is to be effected when the limbs are moved towards one another with the bag portion therebetween, wherewith the other ends of the limbs have arranged thereon a manually openable snap-lock arrangement (8-1 i,13,14) which closes automatically when the limbs are brought together to a sufficient extent. Each of the mutually facing surfaces of the limbs (1, 2) has arranged thereon an opposing channel, the one channel (4) being wider than the other channel (20), with upstanding free channel walls. The walls (3a, 3b) of the narrower channel are intended to be pressed in between the walls (6a, 6b) of the wider channel with the bag material therebetween, and the walls (3a, 3b) of the narrower channel can be elastically pressed in towards one another by the walls (6a, 6b) of the wider channel, the parts of said walls (6a, 6b) being chamfered (7), so that this channel (4) is wider at its upper region than further down along the height of its walls (6a, 6b).
Patent NO-173241-B (NO)
Inventor: BILLMAN FRED L
IPC: C08F20/02
Filed: 1988-09-09
Abstract: The present invention provides for a composition of matter characterized by comprising a free-radical addition polymer containing at least 55 to about 95 mole percent of units derived from maleic anhydride and from about 5 to 45 mole percent of units derived from at least one 1-alkene having at least 4 to 30+ carbon atoms wherein the polymer has an average of at least one unit derived from a 1-alkene per polymer chain based on the number average molecular weight of the polymer and wherein the maleic anhydride units are substantially randomly distributed throughout the polymer chains making up said polymer. The polymers are useful in detergents as stabilizers, additives in floor polishes and, especially when esterified with alcohols, as surfactants.
Patent NO-169837-B (NO)
Inventor: GAWELL LARS IVAR
IPC: C07C221/00
Filed: 1988-12-06
Abstract: Compounds with the general formula I <CHEM> wherein n is 0 or 1, Z is CO or CH(OH), R<1> and R<2> are equal or different and, when equal, hydrogen, methyl, ethyl or propyl and, when different, R<1> is hydrogen and R<2> is methyl, ethyl, propyl or isopropyl, X and Y represent hydrogen, halogen, CF3, CN or an alkyl group, straight or branched having 1-3 carbon atoms, in the ortho, meta or para position provided that when X is in the ortho position and other than hydrogen then Y is other than hydrogen, and when Y is in the ortho position and other than hydrogen then X is other than hydrogen, R represents a straight or branched saturated or unsaturated 1-6 carbon alkyl group, a 3-6 carbon cycloalkyl group, a phenyl group, which may be unsubstituted or may carry a ring substituent X<1>, X<1> preferably being a halogen, or R represents hydrogen, in racemic or optically active form and when Z is CH(OH) also mixtures of diastereomers or a pure diastereomer, with the proviso that the racemate of the compound wherein R<1> and R<2> is hydrogen, X is p-Cl, Y is hydrogen, Z is CO, n is 0 and R is methyl is excluded, or pharmaceutically acceptable salts thereof, processes for the production of said compounds and the use of the said compounds for the treatment of mental disturbances.
Patent NO-178225-B (NO)
Inventor: ZINNEN HERMANN A
IPC: C07C15/08
Filed: 1989-10-30
Abstract: Para-xylene is separated from a feed mixture of C8 isomers of xylene and C9 aromatics by contacting the para-xylene-containing feed mixture with a crystalline aluminosilicate zeolite, e.g. an X or Y zeolite adsorbent having Group IA or IIA cations, e.g. barium and/or potassium, at exchangeable cationic sites. The para-xylene is selectively adsorbed onto the adsorbent. The non-adsorbed feed is then removed from the adsorbent and the para-xylene recovered from the resulting rich adsorbent by desorption with a desorbent comprising 1,2,3,4-tetrahydronaphthalene or an alkyl or dialkyl derivative of 1,2,3,4-tetrahydronaphthalene or mixtures thereof. The majority of the C9 aromatics and the xylene isomers are typically recovered in the raffinate and can be separated from the desorbent by fractionation of the raffinate and the recovered desorbent recycled to the process.
Patent NO-180286-B (NO)
Title: Materiale med bikubestruktur, fremgangsmåte for fremstilling derav samt anvendelse av materialet
Inventor: DISSELBECK DIETER
IPC: B29C70/10
Filed: 1992-04-30
Abstract: Etoneycomb-materiale hvis vegger består av et porøst nettvert av et fiberkomposittmateriale, nemlig av et i en harpiksmatriks innleiret armeringsgarn.En fremgangsmåte for fremstilling av dette honeycomb-materialet beskrives.Honeycomb-materialet benyttes spesielt som lettkjerne ved fremstilling av sandwich-legemer.
Patent NO-180482-B (NO)
Inventor: STEVENS RODNEY WILLIAM
IPC: C07D311/58
Filed: 1992-10-19
Abstract: Compounds having the structure  <IMAGE>  wherein X is nitrogen, oxygen, sulfur or a bond and Z is oxygen or sulfur have been synthesized. These compounds are lipoxygenase inhibitors and are useful as the active agent in pharmaceutical compositions for treating inflammatory conditions in humans and other mammals for which lipoxygenase activity has been implicated.
Patent YU-48053-B (YU)
Title: Elektronski konvertor reaktivne električne snage u učestanost impulsa
Inventor: DJOKIC B
Filed: 1991-07-10
Abstract: ELEKTRONSKI KONVERTOR REAKTIVNE ELEKTRICNE SNAGE U UCESTANOST IMPULSA sastoji se od integratora 1, na ciji ulaz je dovoden signal srazmeran naponu (odnosno struji) u kolu potrosaca cija se potrosnja reaktivne elektricne energije meri; mnozaca analognih velicina 2 na ciji je jedan ulaz doveden izlaz integratora 1, a na drugi ulaz je doveden signal srazmeran vrednosti struje (odnosno napona) u kolu potrosaca; i kola za uoblicavanje 3, na ciji je ulaz doveden signal srazmeran naponu u kolu potrosaca, a na cijem izlazu se dobijaju pravougaoni impulsi cija je frekvencija srazmerna frekvenciji mernog signala, naznacen time, sto je izlaz mnozaca (2) prikljucen na jedan kraj otpornika (R4) ciji je drugi kraj prikljucen na invertujuci "-" ulaz operacionog pojacavaca (5), ciji je neinvertujuci ulaz "+" prikljucen na nulti potencijal mernog sistema, a izlaz operacionog pojacavaca (5) je prikljucen na jedan kraj kondenzatora (C6) ciji je drugi kraj prikljucen na invertujuci ulaz "-" operacionog pojacavaca (5), a izlaz operacionog pojacavaca (5) prikljucen na neinvertujuci "+" ulaz deferencijalnog komparatora (7), ciji je invertujuci "-" ulaz prikljucen na referentni potencijal R, a izlaz diferencijalnog komparatora (7) je prikljucen na ulaz D flip-flopa (8), ciji je izlaz Q prikljucen na kontrolni ulaz analognog prekidaca (9), ciji je jedan kraj prikljucen na referentni potencijal R, a drugi kraj analaognog prekidaca (9) prikljucen je na jedan kraj otpornika (R10) ciji je drugi kraj prikljucen na invertujuci "-" ulaz operacionog pojacavaca (5), dok je izlaz kola za uoblicavanje prikljucen na taktni C-ulaz flip-flopa (8), a izlaz komparatora (7) je prikljucen na taktni C - ulaz flip-flopa (11), ciji je D-ulaz prikljucen na potencijal logicke nule, dok je komplementarni Q izlaz flip-flopa (11) prikljuecn na jedan kraj otpornika (R12) ciji je drugi kraj prikljucen na ulaz S za setovanje flip-floca (11) i na jedan kraj kondenzatora (C13) ciji je drugi kraj prikljucen na potencijal logicke nule.
Patent YU-47240-B (YU)
Title: Dvo-osni optički inercioni sistem koji koristi rotor žiroskopa kao stabilnu referencu
Inventor: GRIFFIN W S
IPC: G02B27/64
Filed: 1984-07-19
Abstract: DVO-OSNI OPTIČKI INERCIONI SISTEM KOJI KORISTI ROTOR ŽIROSKOPA KAO STABILNU REFERENCU, naznačen time, što obuhvata žiroskop (10) sa dva stepena slobode, koji sadrži rotor (12) žiroskopa, sredstvo (18, 20) za omogućavanje optičkog pristupa rotoru (12) žiroskopa (10) i sredstvo koje sadrži izvor (32) elektromagnetne energije radi obezbedjivanja elektromagnetne energije zraka i radi usmeravanja zraka u optičkoj putanji ka reflektivnoj površini (19) rotora (12) žiroskopa (10), a pod takvim uglom da energija koja se od njega reflektuje bude praktično normalna na tu površinu (19) i da predstavlja stabilisani referentni zrak. Prijava sadrži još 9 zavisnih zahteva.
Patent YU-45904-B (YU)
Title: POSTUPAK ZA DOBIJANJE DIHIDROIMIDAZOPIROLOPIRIDINA HINOLINA, TIENO-I FURO(2,3-b) PIRIDINA, DIHIDROTIENO-I FURO(2,3-b) PIRIDINA, TIENO-I FURO(3,2-b) PIRIDINA I DI HIDROTIENO-I FURO(3,2-b) PIRIDINA
Inventor: LOS M
IPC: C07D471/14
Filed: 1984-08-01
Abstract: POSTUPAK ZA DOBIJANJE DIHIDROIMIDAZOPIROLOPIRIDINA HINOLINA, TIENO-I FURO(2,3-b) PIRIDINA, DIHIDROTIENO-I FURO(2,3-b) PIRIDINA, TIENO-I FURO(3,2-b) PIRIDINA I DI HIDROTIENO-I FURO(3,2-b) PIRIDINA, formule: u kojoj R1 i R2 svaki predstavljaju C1-C3 alkil ili ciklopropil grupu, pod uslovom da je zbir ugljenikovih atoma kod R1 i R2 od 2-5; i kada se R1 i R2 razmatraju zajedno sa ugljenikom za koji su pricvrsceni, onda mogu formirati C3-C6 cikloalkil prsten proizvoljno supstituisan metil grupom; W je kiseonik ili sumpor; X je vodonik, halogen ili metil grupa; Y i Z su svaki vodonik, halogen, C1-C6 alkil, C1-C4 hidroksi alkil, C1-C6 alkoksi, C1-C4 alkiltio, fenoksi, C1-C6 alkoksi, C1-C4 alkiltio, fenoksi, C1-C4 halogenalkil, OCF2CHF2, OCF3, OCHF2; nitro, cijano, NR4R5, C3-C8 ravan ili razgranati alkeniloksi niz proizvoljno supstituisan sa 1-3 halogena, C3-C8 ravan ili razgranati, alkiniloksi niz proizvoljno supstituisan sa 1-3 halogena, ili fenil grupa proizvoljno supstituisana sa jednom C1-C4 alkil, C1-C4 alkoksi grupom ili halogenom; R4 je vodonik ili C1-C4 alkil grupa; R5 je C1-C4 alkil grupa; I, kada se uzimaju zajedno, Y i Z mogu formirati prsten u kojem je YZ predstavljeno (1) strukturom: _(CH2)n-, gde n je ceo broj 2, 3 ili 4, pod uslovom da je X vodonik; ili (2) strukturom halogen, C1-C4 alkil, C1-C4 alkoksi, C1-C4 alkiltio, C1-C4 alkilsulfonil, C1-C4 halogenalkil, NO2, CN, fenil, fenoksi, amino, OCF3, OCHF2, OCF2CHF2, C1-C4 alkilamino, dialkil (C1-C4) amino, hlorfenil, metilfenil, C3-C8 ravan ili razgranati alkeniloksi niz proizvoljno supstituisan sa 1-3 halogena, C3-C8 ravan ili razgranati alkiniloksi niz proizvoljno supstituisan sa 1-3 halogena, ili fenoksi grupa supstituisana sa jednom C1, CF3, NO2 ili CH3 grupom, pod uslovom da samo jedan od supstituenata L, M, R7 ili R8, mogu predstavljati supstituent razlicit od vodonika, halogena, C1-C4 alkil, ili C1-C4 alkoksi grupe; ili (3) strukturama: gde B je kiseonik ili sumpor; R9 i R10 svaki predstavljaju vodonik, halogen, fenil, ili C1-C4 alkil ili fenil grupu; R11 i R12 svaki predstavljaju vodonik, C1-C4 alkil ili fenil grupu; i kada R1 i R2 nisu isti, cis- ili trans- izomeri ili njihove smese ili opticki izomeri (cis- ili trans- ili njihove smese); naznacen time, sto reaguje jedinjenje strukture u kojoj su R1, R2, W, X, Y i Z kao sto je opisano ranije, sa najmanje jednim molskim ekvivalentom anhidrida sircetne kiseline u prisustvu piridina i acetonitrila, pri cemu nastaje zeljeni produkt.
Patent YU-47666-B (YU)
Title: Avion, naročito poljprivredni manje nosivosti
Inventor: STANOJEVIC D
IPC: B64D1/18
Filed: 1985-12-31
Abstract: AVION, NAROČITO POLJPRIVREDNI MANJE NOSIVOSTI sa trupom (3) tipa gondole i dvema repnim gredama (45) koje, konzolno vezane na krilu (2), nose na svojim krajevima vetikalne stabilizatore (46), spojene međusobno na vrhovima horizontalnim stabilizatorom (47) u krutu ćeliju, naznačen time, što je hoper (5) sa hemikatima smešten u sredinu gondole iza pilotske kabine (4) koja je na čelu trupa (3), a ispred tuboelisnog motora (8) koji je smešten na kraju gondole u motorskom prostoru sa propulzorom (12), a koji je postavljen dovoljno visoko u odnosu na krilo (2), da svojim mlazom ne remeti rad uređaja (25) za rasipanje hemikata, pri čemu je uređaj (25) postavljen ispod izlazne ivice duž celog razmaha krila (2). Prijava sadrži još 6 zavisnih zahteva.
Patent RS-50105-B (RS)
Inventor: CVETKOVIC OLGA
IPC: C09C1/04
Filed: 2001-11-07
Abstract: Postupak za proizvodnju cink-fosfatnih pigmenata polazeći od cink oksida i fosforne kiseline kod koga je vreme reakcije skraćeno a dobijeni pigmenti ekološki potpuno neškodljivi, naznačen time, što se povećavanje reaktivnosti cink-oksida, pre reakcije sa fosfornom kiselinom, postiže rastvaranjem odnosno hidratacijom cink-oksida u vodi na temperaturi od 75°C pri čemu on "bubri" uz intenzivno mešanje, u vremenu od 2 sata.
Patent ZA-796155-B (ZA)
Title: Production of belting
Inventor: LITCHFIELD P
IPC: B29D29/06
Filed: 1979-11-15
Abstract: Solid woven conveyor belting is produced by a process which includes the step of subjecting the fabriccarcase(5)to a plurality of alternating changes of direction whilst immersed in a bath (14) of impregnant materials (15), each of said changes of direction being effected by causing the carcase to follow a generally curved path whose radius of curvature is appreciably less than 75 mm. Prior to immersion, a synthetic polymeric yarn-containing carcase may be subjected to a shrinking treatment (10) effective to shrink at least the synthetic fibre component of the carcase.
Patent ZA-844235-B (ZA)
Title: Ventilator device
Inventor: TANNER ROBERT ALFRED
IPC: A62C2/12
Filed: 1984-06-06
Abstract: A ventilator device comprises a casing (2) having one or more openings (3) for passage of ventilation airtherethrough, a shutter (7) within the casing and normally held retracted from said one or more openings, first means (15) for urging the shutter to a position to close the one or more openings, and second means (13) actuation of which releases the shutter to cause it to be moved by said first means to close said one or more openings.
Patent ZA-847731-B (ZA)
Title: 2-amino-5-hydroxy-4-methylpyrimidine derivates
Inventor: LAMATTINA JOHN LAWRENCE
IPC: C07D239/42
Filed: 1984-10-02
Abstract: Novel 2-amino-5-hydroxy-4-methylpyrimidines and substituted amino derivatives thereof useful as inhibitors of leukotriene synthesis for the treatment of pulmonary, inflammatory and cardiovascular diseases, cancer and psoriasis. In addition these compounds are cytoprotective and therefore useful in the treatment of peptic ulcers. A process for the preparation of such active compounds by ring rearrangement of 2-amino-5-acetyloxazole, pharmaceutical compositions containing the novel active compounds and compositions containing these compounds in combination with other anti-inflammatory agents or gastric anti-secret- t ory agents.
Patent ZA-918090-B (ZA)
Title: A dust-free embedding compound for precision castings and a process for the production of this embedding compound
Inventor: GANTERT GERLINDE
IPC: A61K6/00
Filed: 1991-10-09
Abstract: Dust-free investment materials for producing precision castings consisting of water-soluble phosphates, magnesium oxide and silicon dioxide are obtained when the investment material is divided into two components a and b, where component a contains all the magnesium oxide, where appropriate a part of the silicon dioxide and, if silicon dioxide is present, 0.4 to 6% by weight of a hydrophilic organic solvent, and component b contains the phosphate, the remainder of the silicon dioxide and at least 0.5% by weight of water.
Patent ZA-967753-B (ZA)
Title: Process for the production of a cellulose moulded body
Inventor: MULLEDER EDUARD
IPC: D01F2/00
Filed: 1996-09-13
Abstract: PCT No. PCT/AT96/00167 Sec. 371 Date May 2, 1997 Sec. 102(e) Date May 2, 1997 PCT Filed Sep. 19, 1996 PCT Pub. No. WO97/11213 PCT Pub. Date Mar. 27, 1997A process for the production of a cellulose moulded body, particularly cellulose fibers, wherein a cellulose-containing material is introduced into an aqueous solution of a tertiary amine-oxide to suspend said cellulose-containing material, water is withdrawn from the suspension while intensively mixing it and subjecting it to elevated temperature and reduced pressure until a solution of cellulose is produced, and the solution is moulded using a forming tool, particularly a spinneret, and passed into a precipitation bath to precipitate the cellulose dissolved, and is characterized in that a suspension containing a cellulose-containing material which has been exposed to an electron radiation is used to produce the cellulose solution. (Fig.
Patent ZA-967757-B (ZA)
Title: Compositions and methods for the prevention and treatment of primary and metastatic neoplastic diseases and infectious diseases with heat shock/stress proteins
Inventor: SRIVASTAVA PRAMROD K
IPC: A61K38/00
Filed: 1996-09-13
Abstract: The present invention relates to methods and compositions for eliciting an immune response and the prevention and treatment of primary and metastatic neoplastic diseases and infectious diseases. The methods of the invention comprise administering a composition comprising an effective amount of a complex, in which the complex consists essentially of a heat shock protein (hsp) noncovalently bound to an antigenic molecule. "Antigenic molecule" as used herein refers to the peptides with which the hsps are endogenously associated in vivo as well as exogenous antigens/immunogens (i.e., with which the hsps are not complexed in vivo) or antigenic/immunogenic fragments and derivatives thereof. In a preferred embodiment, the complex is autologous to the individual. The effective amounts of the complex are in the range of 10-600 micrograms for complexes comprising hsp70, 50-1000 micrograms for hsp90, and 10-600 micrograms for gp96. The invention also provides a method for measuring tumor rejection in vivo in an individual, preferably a human, comprising measuring the generation by the individual of MHC Class I-restricted CD8+ cytotoxic T lymphocytes specific to the tumor. Methods of purifying hsp70-peptide complexes are also provided.
Patent ZA-992230-B (ZA)
Title: Aqueous disinfecting agent containing performic acid and peracetic acid, process for production thereof and use thereof.
Inventor: HUSS MICHAEL
IPC: C02F1/72
Filed: 1999-03-19
Abstract: Disinfectant solutions (I) containing performic acid, peracetic acid and hydrogen peroxide are new. An Independent claim is also included for the production of (I).
Patent GB-2386523-B (GB)
Title: Symmetric key cryptosystem
Inventor: GOLIGHTLY SAMUAL JAMES
IPC: H04L9/26
Filed: 2002-03-15
Granted: 2005-02-23
Abstract: A symmetric (shared key) key encryption system which encodes message data using an algorithm, a secret key(1) and a random initial message(5) and a matching decryption system which decodes encrypted data using an algorithm and the same secret key(1). The system uses an irreversible function and a random initial message(5) to obscure the key(1) from cryptographic analysis, resulting in a system with a high level of data confidentiality at the same time as low resource utilisation and high speed operation. Confidentiality is further enhanced by the essentially linear relationship between key length and the product of resource utilisation and processing time per unit message data, allowing the system architect to select a longer key length without disproportionate increase in complexity or power consumption or decrease in speed.
Patent GB-2404965-B (GB)
Title: Valve assembly
Inventor: SHAW EDWARD GILBERT
IPC: F16K47/08
Filed: 2003-08-13
Granted: 2007-05-09
Abstract: A valve assembly comprising a chamber, the chamber having an inlet which is adapted to be connected to a source of relatively high pressure fluid, and an outlet which is adapted to be connected to a source of relatively low pressure fluid, and a switch valve which is switchable between a first configuration in which the valve closes the outlet and opens the inlet, and a second configuration in which the valve closes the inlet and opens the outlet, characterised in that a flow control device is provided between the outlet and the volume of relatively low pressure fluid, the flow control device including a restrictor portion which restricts flow of fluid through the flow control device, the extent to which fluid flow is restricted decreasing as the fluid pressure in the chamber increases.