baber/WOPTO huggingface dataset:
Patent NO-173869-B (NO)
Inventor: WALDECK HARALD
IPC: C07D519/00
Filed: 1990-03-07
Abstract: Compounds corresponding to the formula I   <IMAGE> (I)  in which R1 represents hydrogen, lower alkyl or cycloalkylalkyl with 4-7 carbon atoms, R2 represents hydrogen, halogen, lower alkyl, lower alkoxy or trifluoromethyl, and R3 represents hydrogen, halogen, lower alkyl or lower alkoxy, or R2 and R3 together denote an alkylenedioxy group, R4 represents cycloalkyl with 5 to 6 carbon atoms, thiophene or optionally substituted phenyl, R5 represents hydrogen or halogen, R6 represents hydrogen, halogen, lower alkyl, lower alkoxy or trifluoromethyl, and Z represents an alkylene chain with 2-4 carbon atoms, which can optionally be mono- or disubstituted by lower alkyl or onto which a 5-6-membered carbocyclic ring can optionally be fused, or represents an -X-CH2-CH2- chain, which have pharmacologically valuable properties, are described, together with a method for their preparation.
Patent NO-179328-B (NO)
Inventor: FUNG YUEN KAI
IPC: C07K16/00
Filed: 1990-03-30
Abstract: The present invention discloses a method of determining the prognosis of a cancer patient by determining the presence or absence of Retinoblastoma gene product in tumor antibodies which specifically bind to the hydrophilic c-terminus of the retinoblastoma protein are also provided.
Patent SE-331232-B (SE)
Inventor: ANTHON E
IPC: F04D1/04
Filed: 1968-02-29
Abstract: 1,166,225. Centrifugal pumps. AMERICAN OPTICAL CORP. Feb. 9, 1968 [March 22, 1967], No. 6642/68. Heading F1C. A rotary pump comprises a housing divided by an annular partition into upper and lower chambers, the partition being integral with or in circumferential contact with the inner surface of the lower chamber so as to provide an overflow passage having a smaller radius than the lower chamber, an intake impeller in the lower chamber and a discharge impeller in the upper chamber, at least one intake pipe communicating with the lower chamber and projecting into it, and a discharge port communicating with the upper chamber. The housing comprises sections 22, 23, 24, Fig. 3, and a cover plate 19, held together by tie rods (not shown). The electric driving motor (not shown) is bolted to the coverplate 19 with its shaft 33 connected to a stub shaft 32. Impellers 30, 31 are clamped against a shoulder 32' on the stub shaft 32 by means of a clamping disc 34 and screws 36. Impeller 30 comprises a disc 49 formed with holes 50 and carrying depending vanes 47. Impeller 31 comprises discs 53, 54, 55 each formed with holes 56, Figs. 3 and 5, and notched at 58 to form vanes 59. Intake pipes 38 project into the housing between the discs 53, 54, 55, and are connected to separate sources of liquid. Any unused intake pipes 38 may be sealed off or allowed to remain open and suck air into the pump. The pump can be initially primed through the discharge connection 64. The impeller 31 rotates the liquid present in the base of the pump to form a vortex. The ends of the intake pipes 38 are below the free inner surface of the vortex, and the high velocity of the liquid passing over them creates a partial vacuum to draw liquid from any vessel to which any intake pipe is connected. The liquid drawn into the pump rises above an overflow partition 44 and is discharged through the discharge connection 64 by the impeller 30. Air drawn into the pump leaves through impeller holes 56 and 50, space 66 and overflow port 65. If there is only intermittent liquid intake, the stepped lower surface of the partition 44 retains sufficient to keep the pump primed, this liquid returning to the lower part of the pump casing through holes 57 in the disc 53. If the discharge connection 64 is blocked, any overflow from the pump housing can leave through the overflow port 65. A normally closed sludge drain 60 permits the pump housing to be cleaned and drained. In a simplified embodiment, Figs. 10-12 (not shown), the lower impeller (31a) comprises a single disc carrying dependent vanes (69) each formed with a slot (70) to clean the intake pipes (38).
Patent SE-354483-B (SE)
Inventor: COTTA E
IPC: A61K35/74
Filed: 1969-06-09
Abstract: 1,219,709. The antibiotic axenomycine. SOC. FARMACEUTICI ITALIA. 6 June, 1969 [11 June, 1968], No. 28849/69. Heading C2A. The novel antibiotic axenomycine, also named F.I. 2604, is produced by cultivating Streptomyces lisandri n. sp., I.P.V 1951, I.M.R.U. 3935, I.M.I. 137178, or an axenomycine-producing strain thereof, under aerobic conditions in an aqueous medium containing assimilable sources of carbon and nitrogen and mineral salts, and isolating the axenomycine from the cultivated medium. The cultivation is preferably carried out at 23-37‹ C. and pH 6-9 for 60-160 hours. Axenomycine is a complex of two components, axenomycines A and B. The complex and its components are amorphous yellowish-white substances, soluble in methyl, ethyl and propyl alcohol, sparingly soluble in water, ethyl acetate, acetone and chloroform, and insoluble in benzene and petroleum ether. They reduce Fehling's solution and ammoniacal silver nitrate, give a positive reaction with tetrazole blue and a weakly positive Molisch reaction. They give negative reactions with ferric chloride, the aniline phthalate test for aldoses and the naphthoresorcinol test for ketoses. Axenomycine A has the following characteristics: elementary analysis, 61.74% C, 8.52% H, 28.87% O; molecular weight 1451.3; melting point 127-142‹ C. to give a transparent reddish gel; [α]<SP>23‹</SP> D  = + 10À5‹ (C = 0.9 in MeOH); Rf = 0.49 on silica gel at pH 7.0 using n. butanol: acetic acid: water = 4: 0.5: 1; U.V. spectrum in MeOH has absorption peaks at 249, 254 and 330 mÁ and a shoulder at 265-268 mÁ; I.R. spectrum in a KBr disc has peaks at 2.94, 3À44, 5.78, 6.00, 6.16, 6.24, 6.88, 7.25, 7.41, 8.61, 8.85, 9.35, 10.00, 10.40, 10.95, 11.8 and 12À5 Á. Axenomycine B has the characteristics: elementary analysis, 62.8% C., 8.58% H, 27.8% O; molecular weight 1330.2; melting point 122- 140‹ C.; [α]<SP>23‹</SP> D  = + 5‹ (C = 0.9 in MeOH); Rf = 0À61 on silica gel at pH 7À0 using n. butanol: acetic acid: water = 4À0 : 0À5: 1; U.V. spectrum in MeOH has absorption peaks at 249, 254 and 330 mÁ and a shoulder at 265- 268 mÁ; I.R. spectrum in a KBr disc has peaks at 2.94, 3À40, 5.82, 6.00, 6.16, 6.24, 6.86, 7.25, 7.41, 8.60, 8.85, 9.35, 10.00, 10.40, 10.98, 11.8, and 12À5 Á. The antibiotic complex may be extracted from the separated mycelium with e.g. methanol, or from the whole broth with a water-immiscible solvent, and purified by precipitation with a non-solvent followed by counter-current distribution. The two components may be separated by chromatography on a silica gel column at pH 7.0, developing with BuOH: HAc: H 2 O, 4: 0À5: 1 by volume. The antibiotics have anthelmintic, antiprotozoal and antifungal activity. Pharmaceutical compositions comprise axenomycine complex or one of its components A or B together with a pharmaceutically acceptable vehicle.
Patent SE-311500-B (SE)
Inventor: MUIJDERMAN E
IPC: B24B47/14
Filed: 1966-07-14
Abstract: 1,157,273. Hydraulic screw-type motors. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. July 14, 1966 [July 17, 1965], No.31617/66. Heading F1T. A hydraulic screw-type motor comprises a cylindrical rotor disposed within a cylindrical bore in a housing, the rotor being formed with two helical grooves of opposite pitch, the housing being provided with an inlet for high pressure medium in the region where the helical grooves adjoin. An outlet duct is provided in the housing at the opposite ends of the helical grooves. The width of the helical walls forming the helical grooves is small compared with the groove width, whilst the core ciameter in the region of one of the groove patterns is larger than the core diameter in the region of the other groove pattern. At the end of the groove pattern of larger core diameter, there is provided an axial thrust bearing to which hydraulic medium is supplied. In the embodiment shown the rotor 4 is formed with helical groove patterns 5 and 6 of opposite hand, the rotor being mounted in the housing 1 by means of an axial thrust bearing 9, 10, 11. Hydraulic fluid under pressure is supplied through ducts 2 and 3 to the centre of the rotor and then flows therethrough in opposite directions, the fluid discharging into annular grooves 7 and thence through outlet duct 8. The core diameter of the rotor a is greater than core diameter b. The ratio of the width c of the helical wall to groove width d is 0À1 while the ratio of the clearance e between the peak of the helical walls and the cylindrical wall of the housing to the clearance f between the core periphery and the cylindrical wall of the housing is 0À085. The pitch angle of the grooves is 0À25 radian. The output shaft 12 is formed with helical grooves 14 where it passes through the housing so as to prevent leakage. A tool such as a grinding wheel 13 is mounted on the shaft. The rotor is 18 mm in length and 6 mm in diameter and the effective power is 40 W and the speed is around 50, 000 R.P.M.
Patent YU-49020-B (YU)
Inventor: TIBOR BALOGH DR
IPC: C07H5/08
Filed: 1990-06-22
Abstract: Poboljšan postupak za dobivanje tripeptid aldehida, formule I R-D-Phe-Pro-Arg-H.H2SO4 I gde R predstavlja vodonik ili metil, Phe je fenilalaninska grupa Pro je L-prolinska grupa i Arg označava L-argininska grupa u farmaceutski čistom obliku, kondenzacijom NG-zaštićenog-L-arginin laktama formule IV, H-Arg(Z)-laktam.HCl IV gde Arg ima isto značenje kao napred i Z označava benziloksikarbonil sa dipeptidom formule V, ZR (D-Phe)-Pro-OH V gde R,Z,Phe i Pro su isti kao što je definisano napred, preko mešanog anhidrida, redukcije tripeptid laktama formule III, ZR(D-Phe)-Pro-Arg(Z)-laktam III gde R,Z,Phe,Pro i Arg su isti kao što je definisano napred, sa litijum aluminijum hidridom, i hidrogenolizu tako dobivenog zaštićenog tripeptida aldehida formule II ZR-(D-Phe)-Pro-Arg(Z)-H II gde R,Z,Phe i Arg su isti kao što je definisano napred u prisustvu H2SO4, naznačen tim e, što obuhvata a1) oslobađanje NG-zaštićenog L-arginin laktama in situ tokom kondenzacije NG-zaštićenog-L-arginin laktam hidrohlorida formule IV, H-Arg(Z)-laktam,HCl IV gde Z je isto kao što je definisano napred, i dipeptida formule V, ZR(D-Phe)-Pro-OH V gde R,Z,Phe i Pro su isti kao što je definisano napred, u mešani anhidrid u reakcionoj smeši i zatim dodavanje baze smeši pomenutih reakcionih komponenti, zatim posle redukcije tako dobivenog zaštićenog tripeptid laktama formule III, ZR(D-Phe)-Pro-Arg(Z)-laktam III gde R,Z,Phe,Pro i Arg su isti kao što je definisano napred, razlaganje tako dobivenog kompleksa dodavanjem reakcione smeše u višak 1N H2SO4 na temperaturi od 0 do 5В°C i zatim izvođenje hidrogenolize zaštićenog tripeptida formule II, ZR-(D-Phe)-Pro-Arg(Z)-H II gde R,Z,Phe,Pro i Arg su isti kao što je definisano napred, na temperaturi ispod 10В°C u prisustvu 1-2molarnih ekvivalenata H2SO4 ili a2) posle redukcije tako dobivenog zaštićenog tripeptida laktama formule III, ZR(D-Phe)-Pro-Arg(Z)-laktam III gde R,Z,Phe,Pro i Arg su isti kao što je definisano napred, razlaganje tako nagrađenog kompleksa dodavanjem reakcione smeše u višak 1N H2SO4 na temperaturi od 0 do 5В°C, zatim izvođenje hidrogenolize tako dobivenog zaštićenog tripeptida formule II, ZR-(D-Phe)-Pro-Arg(Z)-H II gde R,Z,Phe,Pro i Arg su isti kao što je definisano napred, na temperaturi ispod 10В°C u prisustvu 1-2molarnih ekvivalenata H2SO4, ili a3) izvođenje hidrogenolize zaštićenog tripeptida formule II, ZR-(D-Phe)-Pro-Arg(Z)-H II gde R,Z,Phe,Pro i Arg su isti kao što je definisano napred, na temperaturi ispod 10В°C u prisustvu 1-2molarnih ekvivalenata H2SO4. Prijava sadrži još 4 zavisna zahteva.
Patent YU-45972-B (YU)
Title: Legura čelika visoko otporna na istezanje, habanje i koroziju
Inventor: SCHUMACHER W J
IPC: C22C38/00
Filed: 1984-12-18
Abstract: LEGURA ČELIKA VISOKO OTPORNA NA ISTEZANJE ,HABANJE I KOROZIJU, naznačena time, što sadrži najviše 1.0 mas.% ugljenika, od 10 do 16 mas.% mangana, najviše 0.07 mas.% fosfora, najviše 0.1 mas.% sumpora, od 4 do 6 mas.% silicijuma, od 4 do 6 mas.% hroma, od 4 do 6 mas.% nikla i najviše 0.05 mas.% azota, dok je ostatak gvoždje. Prijava sadrži još 4 nezavisna zahteva i 8 zavisnih zahteva.
Patent ZA-805663-B (ZA)
Title: Tape cartridge assembly and tape transport apparatus for use therewith
Inventor: GLINIORZ L
IPC: G11B23/08
Filed: 1980-09-12
Abstract: A magnetic tape cartridge and tape transport apparatus for use therewith, comprising a cartridge housing and a support which is movable inside the housing in all directions in the plane of the latter and on which hubs are rotatably mounted, between which hubs a magnetic tape can be wound to and fro, and further comprising spring elements which urge the support toward the front wall of the housing, which wall is provided with openings, the tape transport apparatus having means for receiving the cartridge housing, for which guide elements and actuatable locking means are provided, and a magnetic head and capstans which can pass through the openings in the front wall, the capstans being urged, by spring pressure, into contact with the rolls of magnetic tape.
Patent ZA-849843-B (ZA)
Title: Converted starches for use as a fat-or oil-replacement in foodstuffs
Inventor: LENCHIN JULIANNE M
IPC: A23L1/00
Filed: 1984-12-18
Abstract: Converted starches, which with water form gels having a neutral taste and perferably a creamy, smooth consistency, are suitable as fat-and/or oil-replacements in various foodstuffs, especially high fat-and/or oil-containing foodstuffs such as ice cream and mayonnaise. The starches (e.g., tapioca, corn, or potato) have a DE of less than 5 and their aqueous dispersions have a hot flow viscosity of at least about 10 sec. at 10-50% solids, and they are capable of forming gels having a strength of at least about 25 g. within 24 hrs. and 4 DEG  C. at 10-50% solids. The preferred starches are tapioca dextrins having a DE of about 2 or less and hot flow viscosity and gel strength of about 20-100 sec. and 65-930 g. at 25-35% solids. Acid- and enzyme-converted starches are also suitable.
Patent ZA-853604-B (ZA)
Title: Railway signalling system
Inventor: WALTER HEINRICH
IPC: B61L7/10
Filed: 1985-05-13
Abstract: A circuit arrangement for operating a multi-concept light signal is disclosed, which is controlled via a multi-line cable connection (K1...K4) from a signal box (ST). The individual light sources (rtH, rtN, gnH, geH, geN) are supplied from a common primary circuit via a common feed transformer (TR) mounted near to the signals. The connection and monitoring of the light sources occurs via control relays (S1, S2) located in the signal unit (SE) and arranged in the control circuits or via monitoring relays (RÜ, HFÜ, J) which are arranged in the individual light source circuits and have contacts (RÜ1...3, HFÜ1...3, J1, J2) in special monitoring circuits. The control and monitoring circuits are connected in the signal unit to one phase (R) of the common primary circuit, in the signal box to the neutral conductor or to a different phase of a three-phase network. The cable lines (K1...K4) of the connecting cable are each used according to the set signalling concept as a supply, control or monitoring line. <IMAGE>
Patent ZA-885235-B (ZA)
Title: Metering and spray pump
Inventor: ANDRIS RAIMUND
IPC: B05B11/00
Filed: 1988-07-20
Abstract: In order to create a metering and spray pump of high functional reliability, consisting of as few individual parts as possible and able to be produced with as low production costs, in particular assembly costs, as possible, in which the pumping member consists of an elastically-flexible bellows (4), which is arranged connectively between mutually movable, dimensionally stable housing parts (1,2), the bellows (4) has at its one end, as axial extension, a radially flexible, sleeve-like annular wall section (30), which encloses in sealing manner like a valve the circumferential surface (31) of a socket (24), in the form of a ring or pot, integrally molded onto the housing part (1) executing the pumping strokes. The other end of the bellows (4) is provided with an end wall section (17) which has at least one passage opening (18) and covers like a valve one or more outlet openings (16) of a housing end wall (12) of the second housing part (2) or forms the valve seat for a valve closing member which is molded onto a displacement body arranged in the bellows.
Patent ZA-899566-B (ZA)
Title: Liquid compositions containing carboxylic esters
Inventor: JOLLEY SCOTT TED
IPC: C09K5/04
Filed: 1989-12-14
Abstract: A liquid composition is described which comprises: (A) a major amount of a fluorine containing hydrocarbon containing one or two carbon atoms, and (B) a minor amount of a soluble organic lubricant comprising at least one carboxylic ester compound characterized by the formulae: RO(R<1>O)nC(O)R<2> and R<3>OC(O)R<2>, wherein R is a hydrocarbyl group of at least 2 carbon atoms, R<1> is a hydrocarbylene group, R<2> is H, hydrocarbyl, -CF3, -R<4>CN, -R<4>-NO2 or R<5>OCH(R<6>)-, R<3> is a -R<4>CF3, -R<4>CN or -R<4>NO2 group, provided that R<3> may be a hydrocarbyl group when R<2> is -R<4>CN, n is an integer from 1 to about 50, R<4> is a hydrocarbylene group, R<5> is H, a lower hydrocarbyl group or R<7>C(O)- where R<7> is a hydrocarbyl group, and R<6> is H or a lower hydrocarbyl group. Liquid compositions are also described containing fluorine-containing hydrocarbons also containing other halogen such as chlorine. The liquid compositions are useful particularly as refrigeration liquids in refrigerators and air-conditioners including auto, home and industrial air-conditioners.
Patent ZA-902668-B (ZA)
Title: Tetrahydrobenz(c,d)indole serotonin agonists
Inventor: FLAUGH MICHAEL EDWARD
IPC: A61K31/00
Filed: 1990-04-05
Abstract: This invention provides a 6-substituted-4-(amino or substituted amino)tetrahydrobenz[c,d]indole serotonin agonists of the formula <CHEM>  wherein:  R<1> is hydrogen, C1-C4 alkyl, allyl or   - @-R<4>;  R<2> is hydrogen, C1-C4 alkyl or allyl;  R<3> is hydrogen, C1-C3 alkoxy, -NR<5>R<6> or C1-C3 alkylthio;  R<4> is hydrogen, methyl, ethyl, or vinyl; R<5> and R<6> are independently a C1-C4 alkyl, a C1-C4 alkyl substituted with a phenyl group, or a phenyl group, or R<5> and R<6> together form a C3-C5 heterocyclic ring;  R<5> is additionally hydrogen; X is O or S. (
Patent ZA-904020-B (ZA)
Title: Immersible casting pipe for introducing a steel melt into a continuous casting ingot mould
Inventor: STREUBEL HANS
IPC: B22D11/10
Filed: 1990-05-25
Abstract: A submerged nozzle (3) for pouring molten steel into the charging region of a continuous casting mould (4) consists of a tube part connected to a casting vessel (2) and of an end part provided with a bottom piece (12). To create an operationally reliable submerged nozzle (3) with better flow distribution, the bottom piece (12) has a smaller width in the direction of the outflow openings (11) than the spacing of the walls forming the upper boundary of the outflow openings (11). <IMAGE>
Patent ZA-906708-B (ZA)
Title: Thiazolidinedione derivatives
Inventor: HINDLEY RICHARD MARK
IPC: C07D277/34
Filed: 1990-08-23
Abstract: A compound of formula (I) : <CHEM> or a tautomeric form thereof and/or a pharmaceutically acceptable salt thereof, and/or a pharmaceutically acceptable solvate thereof, wherein: A<1> represents a substituted or unsubstituted aromatic heterocyclyl group; A<2> represents a benzene ring having in total up to five substituents; X represents O, S or NR<1> wherein R<1> represents a hydrogen atom, an alkyl group, an acyl group, an aralkyl group, wherein the aryl moiety may be substituted or unsubstituted, or a substituted or unsubstituted aryl group;  Y represents O or S;  R<2> represents an alkyl, aralkyl or aryl group; and n represents an integer in the range of from 2 to 6; a process for the preparation of such a compound, a pharmaceutical composition comprising such compound and the use of such compound and composition in medicine.
Patent ZA-925132-B (ZA)
Title: A method of manufacturing a cooking utensil
Inventor: GALLE ALFRED
IPC: A47J27/00
Filed: 1992-07-09
Abstract: A method of manufacturing a cooking utensil comprising a round container for the food. The container comprises a container, a plate made of heat-conducting material and a cap enclosing the plate, the cap being made from a sheet-metal disk and having a base provided with a convex curvature towards the container and also having collar which bears against the round container in a curved transition region between the container base and the container jacket. The container and the cap are made of stainless steel. The plate is intermetallically bonded to the container base and the cap. The plate, the sheet-metal disk and the container base are centered and connected by a central spot weld, using electric resistance welding. Next, the intermetallic bond is produced by single or multiple impulse pressure and permanent deformation and the cap collar is formed on the sheet-metal disk and its rim is placed around the container. Use is made of a sheet-metal disk having an edge which, during the shaping of the cap collar, is permanently deformed and pressed against the container. The sheet-metal disk, the plate and the container base are centered by the resistance welding so as to be resistant to impulse pressure. The pulse pressure is exerted so as to produce the convex curvature in the cap bottom. During impulse pressure, the air is first expelled from the region between the sheet-metal disk and the cap collar in process of formation. During and after this process, a seal is produced in the form of permanent deformation with regard to the plastic deformation of the plate material.
Patent ZA-932641-B (ZA)
Title: Methods and compositions for the treatment of diseases with interferon while reducing side effects
Inventor: BLATT LAWRENCE M
IPC: A61P31/12
Filed: 1993-04-15
Abstract: Methods for the treatment of cell proliferation disorders, viral infections, and other conditions without causing significant side effects normally associated with interferon therapy, involving administering to a patient in need thereof a therapeutically effective amount of consensus human leukocyte interferon are disclosed. Also disclosed are pharmaceutical compositions of consensus human leukocyte interferon.
Patent ZA-935865-B (ZA)
Title: 17-(3-furyl) and 17-(4-pyridazinyl)-5Béta 14Béta-androstane derivatives active on the cardiovascular system processes for their preparation and pharmaceutical compositions containing same
Inventor: QUADRI LUISA
IPC: C07J1/00
Filed: 1993-08-12
Abstract: 17-(3-Furyl) and (4-pyridazinyl)-5 beta ,14 beta -androstane derivatives of formula (I) <CHEM> wherein the symbol  @ , the symbol ---, Y, R, R<1>, R<2> and R<3> have the meaning indicated in the specification. Processes of making the said compounds and pharmaceutical compositions containing them are also disclosed.
Patent ZA-936693-B (ZA)
Title: Process for the preparation of substituted indanones
Inventor: WEISSE LAURENT
IPC: C07C49/675
Filed: 1993-09-10
Abstract: 1-Indanones of the formula IV or IVa <IMAGE> in which R<1> to R<7> preferably denote hydrogen or alkyl or adjacent radicals R<1> to R<4> form a ring are obtained in a one-step reaction by reacting a compound I <IMAGE>  with a compound of the formula II <IMAGE>  or with a compound of the formula III <IMAGE> with boron trifluoride in anhydrous hydrogen fluoride.>
Patent ZA-939443-B (ZA)
Title: Pressure limiting valve
Inventor: VOSS RICHARD
IPC: E21D15/51
Filed: 1993-12-17
Abstract: A pressure relief valve with flow rates of about 8 000 l/min has a valve housing (2) consisting of a control plunger (4) and a valve plunger (20) with associated springs (14, 33). The valve plunger is arranged so as to be displaceable against a regulating spring supported on the control-plunger side and has a passage hole (31) which has a smaller diameter than the blind hole (8) in the control plunger. This special design of the valve ensures uniform opening and reclosure of the pressure relief valve at the high flow rates described, corresponding packing rings (27, 29) composed of Teflon being used in the region of the valve plunger. <IMAGE>