DK179514B1

DK179514B1 - Shut-off valve and method for cleaning the shut-off valve

Info

Publication number: DK179514B1
Application number: DKPA201770316A
Authority: DK
Inventors: Mogensen Thomas
Original assignee: Limitech Finance Aps
Priority date: 2017-05-08
Filing date: 2017-05-08
Publication date: 2019-02-05
Also published as: EP3622206A4; EP3622206A1; WO2018206060A1; DK201770316A1

Abstract

En Fremgangsmåde til rensning af afspærreventil (1) i et procesanlæg (2) for belægninger efter anvendelse, hvor afspærreventilen (1) i sin monterede tilstand i procesanlægget (2) gennemløber et antal rensetrin omfattende skylning med skyllemiddel, opvarmning med hed damp og udtørring under lavt tryk. Ifølge opfindelsen foretages i det mindste en skylning med skyllemiddel med afspærreventilen (1) i lukket tilstand.A method for cleaning shut-off valve (1) in a process plant (2) for coatings after use, in which the shut-off valve (1) in its mounted state in the process plant (2) goes through a number of cleaning steps comprising rinsing with rinse aid, heating with hot steam and drying out under low pressure. In accordance with the invention, at least a rinse aid rinse with the shut-off valve (1) is closed.

Description

Afspærreventil og fremgangsmåde til rensning af afspærreventil.Shut-off valve and method for cleaning the shut-off valve.

Opfindelsen angår en fremgangsmåde til rensning af en afspærreventil for belægninger efter anvendelse, hvor afspærreventilen i sin monterede tilstand i et procesanlæg gennemløber et antal rensetrin.The invention relates to a method for cleaning a shut-off valve for coatings after use, in which the shut-off valve in its mounted state in a process plant goes through a number of cleaning steps.

En sådan proces er kendt under navnet CIP rensning, hvilket er en forkortelse for Cleaning In Place, idet afspærreventilen forbliver monteret under renseprocessen. Denne type af renseprocesser omfatter typisk at ventilen i sin åbne tilstand gennemskylles af et rensemiddel.Such a process is known as CIP cleaning, which is an abbreviation of Cleaning In Place, since the shut-off valve remains mounted during the cleaning process. This type of cleaning process typically involves flushing the valve in its open state with a cleaning agent.

WO2016091204A1 viser en ventil, som er indrettet til CIP rensning vha en spraykugle anbragt forud for en butterfly-ventil.WO2016091204A1 shows a valve arranged for CIP cleaning using a spray ball placed in front of a butterfly valve.

I henhold til opfindelsen gennemløbes et antal rensetrin, idet rensetrinene omfatter skylning med skyllemiddel, opvarmning med hed damp og udtørring under lavt tryk, hvor i det mindste skylning med skyllemiddel foretages med afspærreventilen i lukket tilstand. Ifølge opfindelsen føres et centerrør, der leder materiale til eller fra afspærreventilen, i sin aksialretning mod eller væk fra en rørflange, der omkredser afspærreventilen idet centerrøret i en første brugssituation føres frem til pakning i hele sin omkreds mod den omkredsende rørflange og i en anden brugssituation beregnet til rensning af afspærreventilen føres i sin aksialretning tilbage i retning bort fra den omkredsende rørflange og herved åbner en alternativ flowkanal vinkelret på centerrørets længdeakse idet afspærreventilen i den første brugssituation:According to the invention, a number of cleaning steps are carried out, the cleaning steps comprising rinsing with rinse aid, heating with hot steam and low pressure drying, where at least rinsing with rinse aid is done with the shut-off valve in the closed state. According to the invention, a center pipe conducting material to or from the shut-off valve is guided in its axial direction towards or away from a pipe flange which circumscribes the shut-off valve, in which, in a first use situation, the center pipe is advanced to seal its entire circumference against the surrounding pipe flange and in a second use situation. intended for cleaning the shut-off valve in its axial direction is moved back in a direction away from the circumferential pipe flange, thereby opening an alternative flow channel perpendicular to the longitudinal axis of the center pipe, with the shut-off valve in the first use situation:

i. enten er åben og tillader materiale at passerer gennem afspærreventilen og gennem centerrøret, eller ii. er lukket og afspærre for materialetransport gennem afspærreventilen og dermed også aflukker centerrøret, idet afspærreventilen i den anden brugssituation:either open and allow material to pass through the shut-off valve and through the center pipe, or ii. is closed and shut off for material transport through the shut-off valve and thus also closes the center pipe, the shut-off valve in the second use situation:

iii. enten er åben og tillader materialetransport gennem centerrøret og gennem den alternative flowkanal, og gennem afspærreventilen, eller iv. er lukket så der kun er transport gennem centerrøret forbi afspærreventilen og gennem den alternative flowkanal.iii. either is open and allows material transport through the center pipe and through the alternate flow channel and through the shut-off valve, or iv. is closed so that there is only transport through the center pipe past the shut-off valve and through the alternate flow channel.

Herved sikres, at især afspærreventilens lukke-flade bliver ordentlig afrenset, samtidig med at rensevæsken ikke trænger gennem den afspærrede ventil og videre ind i et procesanlæg.This ensures, in particular, that the closing surface of the shut-off valve is properly cleaned, while the cleaning fluid does not penetrate through the shut-off valve and further into a processing plant.

Ved af afspærreventilen i den anden brugssituation beregnet til rensning er ført i sin aksialretning bort fra rørflangen opnås en alternativ flowkanal, som er vinkelret på centerrørets længdeakse, således at rensevæsken kan komme i god kontakt med afspærreventilen, især når denne er lukket. Men også når den er åben, kan den alternative flowkanal anvendes til bortledning af rensevæske, som fx ledes gennem den nu åbne afspærreventil. Ved fremgangsmåden sikres hermed via den alternative flowkanal at ikke bare afspærreventilens flade mod centerrøret, men alle dele heraf inklusive pakningsflader kan sikres en effektiv rensning, og bortledningen af rensevæske kan ske sikkert gennem den alternative flowkanal.An alternate flow channel perpendicular to the longitudinal axis of the center tube is provided by the shut-off valve in the second use situation intended for cleaning, so that the cleaning liquid can come into good contact with the shut-off valve, especially when closed. But even when open, the alternate flow channel can be used for draining of cleaning fluid, which is, for example, passed through the now open shut-off valve. By this method, it is thereby ensured via the alternative flow channel that not only the surface of the shut-off valve against the center pipe, but all parts thereof including gasket surfaces can be ensured an effective cleaning and the discharge of cleaning fluid can be done safely through the alternative flow channel.

Det foretrækkes ifølge krav 2, at centerrøret bevæges i sin aksialretning ved at en trykforskel mellem de to sider af et annulært stempel, som er koblet aksielt til centerrøret, etableres idet det annulære stempel udvendigt tætner mod en cylinder, som fastholdes mod den omkransende flange. Herved fås en sikker og præcis styring af positionen af centerrøret så lukning og åbning af den alternative flowkanal altid kan styres. Desuden kan den alternative flowkanal afspærres helt tæt idet centerrøret trykkes mod en sædepakning i den omkransende flange og kan fastholde dette tryk som følge af en trykforskel mellem stemplets to sider.According to claim 2, it is preferred that the center tube is moved in its axial direction by establishing a pressure difference between the two sides of an annular piston axially coupled to the center tube, with the annular piston externally sealing against a cylinder which is held against the circumferential flange. This provides a safe and precise control of the position of the center pipe so that closing and opening of the alternative flow channel can always be controlled. In addition, the alternative flow channel can be completely closed as the center tube is pressed against a seat gasket in the surrounding flange and can maintain this pressure due to a pressure difference between the two sides of the piston.

Opfindelsen angår tillige en afspærreventil, som er egnet til gennemførelse af fremgangsmåden som anført i krav 3, idet afspærreventilen er monteret i en rørflange og omfatter et til rørflangen kobbelbart centerrør, hvor centerrør og rørflange herved udgør en afspærbar flowkanal. Det særlige ved afspærreventilen er, at en alternativ flowkanal omfatter en aflukkelig annular passage mellem en første ende af centerrøret og rørflangen. Denne alternative flowkanal giver mulighed for ved sin placering nær afspærreventilen, at strømning gennem den alternative flowkanal kan være med til at afrense afspærreventilens aktive flader. Når afspærreventilen er lukket, kan tilstrømmende rensevæske flyde gennem centerrøret og slå mod afspærreventilens lukkede overflade og herefter passere ud gennem den alternative radialt orienteret alternative flowkanal. Men også under åbning og lukning af afspærreventilen kan den alternative flowkanal anvendes til at bortlede rensevæske idet væsken sende gennem afspærreventilen til rensning af ventilsæder og andre dele heraf.The invention also relates to a shut-off valve suitable for carrying out the method according to claim 3, wherein the shut-off valve is mounted in a pipe flange and comprises a center pipe which can be coupled to the pipe flange, the center pipe and pipe flange thereby constituting a lockable flow channel. What is special about the shut-off valve is that an alternate flow channel comprises a closable annular passage between a first end of the center tube and the tube flange. This alternative flow channel allows, at its location near the shut-off valve, that flow through the alternative flow channel may help to clean the active surfaces of the shut-off valve. When the shut-off valve is closed, flowing cleaning fluid can flow through the center pipe and strike against the closed surface of the shut-off valve and then pass out through the alternative radially oriented alternative flow channel. However, even during opening and closing of the shut-off valve, the alternate flow channel can be used to dispense cleaning fluid as the liquid sends through the shut-off valve for cleaning valve seats and other parts thereof.

Som anført i krav 4, foretrækkes det at centerrøret er monteret aksialt flytbar i en cylinder koblet til rørflangen, og at et annulært stempel med to aksiale sider er aksialt fikseret til og omkranser centerrøret og danner en pakningsflade mod cylinderens inderside således at en trykforskel mellem stemplets to aksiale sider vil flytte centerrøret mod eller væk fra rørflangen. Herved bliver det muligt med fx trykluft eller via hydraulik på simpel vis at kontrollere stillingen af centerrøret, således at en rensecyklus eventuelt vil kunne etableres via tilkobling af et procesanlæg, hvori afspærreventilen indgår, til en signalgiver som fx en computer eller andet styresystem.As stated in claim 4, it is preferred that the center tube be mounted axially movable in a cylinder coupled to the tube flange and that a two axial side annular piston is axially fixed to and surround the center tube, forming a gasket surface against the inside of the cylinder such that a pressure difference between the piston two axial sides will move the center tube toward or away from the tube flange. This makes it possible, for example, to control the position of the center pipe with, for example, compressed air or via hydraulics, so that a cleaning cycle could possibly be established via connection of a process plant which includes the shut-off valve to a signal generator such as a computer or other control system.

Som anført i krav 5, er der i tilslutning til rørflangen og omkransende centerrøret indrettet et rørstykke, der omkranser den alternative flowkanal og er fæstnet mod cylinderen, hvilken cylinder tillige omfatter pakningsmidler mod en udvendig side af centerrøret, således at centerrøret er aksialt forskydbar i forhold til cylinderen. Herved opnås at strømningen i den alternative flowkanal er adskilt fra det fluidtryk, der etableres på den ene eller den anden side af det annulære stempel.As stated in claim 5, in addition to the tube flange and the surrounding center tube, a pipe piece is arranged which encircles the alternate flow channel and is attached to the cylinder, which also comprises packing means against an outer side of the center tube, so that the center tube is axially displaceable in relation to the cylinder. to the cylinder. Hereby, the flow in the alternate flow channel is obtained from the fluid pressure established on one or the other side of the annular piston.

Som anført i krav 6, er der i området mellem centerrørets første ende og rørflangen indrettet en sædepakning. Det sikres herved, at når den alternative flowkanal er lukket vil der være hermetisk aflukket fra centerrøret og ind i den alternative flowkanal, og ved at indrette sædepakningen af et passende kunststof kan en god slidstyrke og vedvarende pakningsevne opnås.As stated in claim 6, a seat gasket is arranged in the region between the first end of the center tube and the tube flange. It is hereby ensured that when the alternative flow channel is closed, it will be hermetically sealed from the center tube and into the alternative flow channel, and by arranging the seat pack of a suitable plastic a good abrasion resistance and sustained packing ability can be obtained.

Som anført i krav 7 er den i rørflangen monterede afspærreventil en butterflyventil. Denne ventiltype er simpel i sin opbygning og kan anvendes i mange typer af applikationer. Desuden har den en ventilklap, som under renseprocessen kan stilles på langs af strømningen af rensevæske således at begge sider af ventilklappen kan renses samtidig med at ventilsædet udsættes for rensning.As stated in claim 7, the shut-off valve mounted in the pipe flange is a butterfly valve. This valve type is simple in its design and can be used in many types of applications. In addition, it has a valve flap which during the cleaning process can be set longitudinally by the flow of cleaning fluid so that both sides of the valve flap can be cleaned at the same time as the valve seat is exposed to cleaning.

Som anført i krav 8 er rørstykket fæstnet mod flangerøret via en første boltesamling, og cylinderen er koblet mod rørflangen via en anden boltesamling mellem cylinderen og rørstykket. Med boltesamlinger fås let adskilbar elementer, og samtidig bliver de enkelte dele af afspærreventilen geometrisk simple og lette at fremstille fx via spåntagningsprocessor.As stated in claim 8, the pipe piece is attached to the flange pipe via a first bolt assembly and the cylinder is coupled to the pipe flange via a second bolt joint between the cylinder and the pipe piece. Bolt joints provide easily separable elements, and at the same time, the individual parts of the shut-off valve are geometrically simple and easy to manufacture, for example via a chip-making processor.

Opfindelsen skal herefter nærmere forklares under henvisning til tegningerne, på hvilke:The invention will now be explained in more detail with reference to the drawings, in which:

Fig. 1 viser snit gennem afspærreventilen,FIG. 1 shows a section through the shut-off valve,

Fig. 2 viser afspærreventilen udefra i 3D gengivelse,FIG. 2 shows the shut-off valve from outside in 3D rendering,

Fig. 3 er snit og endebillede med afspærreventilen og den alternative flowkanal begge lukkede,FIG. 3 is a sectional and end view with the shut-off valve and the alternate flow channel both closed,

Fig. 4 er snit og endebillede med afspærreventilen i lukket tilstand, men med den alternative flowkanal åben,FIG. 4 is a section and end view with the shut-off valve closed but with the alternative flow channel open,

Fig. 5 er snit og endebiled med afspærreventilen i åben tilstand og den alternative flowkanal lukket,FIG. 5, section and end bilge with the shut-off valve open and the alternative flow channel closed,

Fig. 6 er snit og endebillede med afspærreventilen i åben tilstand, men med den alternative flowkanal lukket,FIG. 6 is a sectional and end view with the shut-off valve open but with the alternative flow channel closed,

Fig. 7 er et snit gennem et anlæg med afspærreventilen monteret,FIG. 7 is a section through a system with the shut-off valve mounted,

Fig. 8 er forstørret cirkeludsnit fra fig. 7 med afspærreventilen vist i snit.FIG. 8 is an enlarged circular section of FIG. 7 with the cut-off valve shown in section.

En afspærreventil ifølge opfindelsen kan fx anvendes i et anlæg af den type som er vist i fig. 7. her er et lukket blandekar 18 forsynet med et indløb 19 i bunden idet tilstrømning gennem indløbet kontrolleres af en afspærreventil 1 som vist i det forstørrede udsnit i fig. 8. Afspærreventilen 1 er via en fleksibel slange 20 forbundet med en lagerbeholder 21, der eksempelvis som vist i fig. 7 er tragtformet, således at et pulvermateriale (ikke vist) i beholderen vha tyngdekraften ledes med et vist tryk mod slangeforbindelsen 20 til afspærreventilen 1. Trykforskelle mellem blandekarret og lagerbeholder samt afspærreventilens stilling kan nu regulere tilstrømningen af pulverformet materiale til blandekarret 18.For example, a shut-off valve according to the invention can be used in a plant of the type shown in FIG. 7. here, a closed mixing vessel 18 is provided with an inlet 19 at the bottom, the flow through the inlet being controlled by a shut-off valve 1 as shown in the enlarged section of FIG. 8. The shut-off valve 1 is connected via a flexible hose 20 to a storage container 21 which, for example as shown in FIG. 7 is funnel-shaped, such that a powder material (not shown) in the container is directed by a certain pressure against the hose connection 20 to the shut-off valve 1. Pressure differences between the mixing vessel and the storage vessel and the position of the shut-off valve can now regulate the flow of powdered material to the mixing vessel 18.

Over tid vil der i et anlæg af denne type aflejres belægninger af det pulverformede materiale på de indvendige overflader der er i kontakt hermed, og følgelig er det nødvendig at anlægget tillige har midler til muliggørelse af rengøring heraf på passende tidspunkter, fx ved skift fra en produktion til en anden, eller når der er risiko for at aflejret pulver harsker eller nedbrydes på anden vis og herefter ender i blandekarret.Over time, in a plant of this type, coatings of the powdered material will be deposited on the inner surfaces in contact therewith, and consequently it is necessary that the plant also has means for enabling it to be cleaned at appropriate times, e.g. production to another, or when there is a risk of deposited powder rancid or otherwise decomposed and then ends in the mixing vessel.

Når afspærreventilen 1, den tragtformede lagerbeholder 21 og rørforbindelsen 20 mellem de to skal rengøres lukkes afspærreventilen 1, og en alternativ flowkanal 5, som går hele vejen rundt langs en tilkoblingsflange for afspærreventilen 1, åbnes. Hermed kan et skyllemiddel tilsættes via en spraykugle 22 og strømme fra den tragtformede lagerbeholder 21, gennem rørforbindelsen 20 og helt frem til den lukkede afspærreventil 1, og herfra strømme radialt ud i den alternative flowkanal 5 idet i det mindste den del af afspærreventilen, som vender væk fra det lukkede blandekar 18 udsættes for skyllemidlet og hermed renses for belægninger. Hvis afspærreventilens forskellige pakningsflader og den side heraf, der vender mod blandekarret, tillige ønskes renset, kan dette ske ved kortvarigt at åbne for ventilen 1.When the shut-off valve 1, the funnel-shaped storage vessel 21 and the pipe connection 20 between the two are to be cleaned, the shut-off valve 1 is closed and an alternative flow channel 5, which goes all the way along a connecting flange for the shut-off valve 1, is opened. Hereby, a rinsing agent can be added via a spray ball 22 and flow from the hopper-shaped storage container 21, through the pipe connection 20 and all the way to the closed shut-off valve 1, and from here flow radially into the alternative flow channel 5, at least the part of the shut-off valve which faces away from the closed mixing vessel 18 is exposed to the fabric softener and thereby is coated with coatings. If the various gasket faces of the shut-off valve and the side thereof facing the mixing vessel are also desired to be cleaned, this can be done by briefly opening the valve 1.

Processen her benævnes også CIP hvilket er forkortelse for det engelske Cleaning In Place. Ved den proces renses ventiler, rør og beholdere uden at disse dele adskilles. I fig. 7 er spraykuglen 22 markeret inde i den tragtformede lagerbeholder 21, og denne er hermed med til at rengøre den tragtformede lagerbeholder 21.The process here is also called CIP, which is short for the English Cleaning In Place. In this process, valves, pipes and containers are cleaned without separating these parts. In FIG. 7, the spray ball 22 is marked inside the funnel-shaped storage container 21, and this helps to clean the funnel-shaped storage container 21.

CIP rensevæsken ledes gennem ventilens alternative flowkanal 5 og via en sidestuds 23 og ud gennem en pumpe 24. Herfra kan væsken sende til rensning eller ledes bort til recipient.The CIP cleaning fluid is passed through the alternate flow channel 5 of the valve and via a side nozzle 23 and out through a pump 24. From here the liquid can be sent for cleaning or diverted to the recipient.

I et næste trin for rengøringen tilføres hed damp gennem den alternative flowkanal 5 og på Fig. 7 er der hertil vist en damptilslutning 25. Dampen gennemskyller såvel lagerbeholderen 21, slangen 20 og stykket mellem afspærreventilen 1 og tilslutningen for slangen 20. Den hede damp sikrer dels en opvarmning af anlæggets dele, og dels en sterilisation af de dele dampen kommer i kontakt med.In a next step of cleaning, hot steam is supplied through the alternative flow channel 5 and in FIG. 7 there is shown a steam connection 25. The steam flushes both the storage container 21, the hose 20 and the piece between the shut-off valve 1 and the connection for the hose 20. The hot steam ensures a heating of the parts of the plant and a sterilization of the parts of the steam coming into contact. with.

I et sidste rensetrin skal anlægget udtørres, og dette sker ved at den alternative flowkanal lukkes til og i blandekarret 18 etableres der et vist undertryk, således at alle rester af damp eller vand suges denne vej ud idet afspærreventilen i dette procestrin står åbent. Tørringsluft kan evt. suges gennem den tragtformede lagerbeholder 21 til sikring af at alle flader bliver helt tørre. Efter endt tørring kan anlægget tages i brug på ny.In a final purification step, the plant must be dried out, and this is done by closing the alternative flow channel to and in the mixing vessel 18 a certain negative pressure is established, so that all residues of steam or water are sucked out this way with the shut-off valve in this process step open. Drying air may be used. is sucked through the hopper 21 to ensure that all surfaces are completely dry. After drying, the system can be re-used.

I figurerne 3 - 5 er de forskellige stillinger, som åbningen af den alternative flowkanal 5 og afspærreventilen 1 giver mulighed for, vist. I fig. 3 og 4 er afspærreventilen 1 lukket og den alternative flowkanal er lukket i fig. 3 og åben i fig. 4.In Figures 3 - 5, the various positions provided by the opening of the alternative flow channel 5 and the shut-off valve 1 are shown. In FIG. 3 and 4, the shut-off valve 1 is closed and the alternative flow channel is closed in FIG. 3 and open in FIG. 4th

I fig. 5 og 6 er afspærreventilen 1 åben, og i fig. 5 ses den alternative flowkanal lukket af og i fig. 6 vises den åbnet.In FIG. 5 and 6, the shut-off valve 1 is open and in FIG. 5 shows the alternative flow channel closed by and in FIG. 6 it appears opened.

Åbning og lukning af den alternative flowkanal 5 afstedkommes ved at flytte centerrøret 3 i sin aksialretning i forhold til rørflangen 4, således at dens ene ende 11 enten er i afstand fra pakningen 15 eller ligger an herimod. Centerrøret 3 er i sin anden ende koblet til en fleksibel slange 20 eller bevægeligt rør, således at centerrørets bevægelse kan optages heri.Opening and closing of the alternative flow channel 5 is effected by moving the center tube 3 in its axial direction with respect to the tube flange 4, so that its one end 11 is either spaced from the seal 15 or abuts against it. The center tube 3 is at its other end coupled to a flexible hose 20 or movable tube so that the movement of the center tube can be accommodated therein.

Rundt om centerrøret 3 er monteret et annulært stempel 6, som indvendigt er koblet i aksialretningen til centerrøret, så dette stempel 6 og centerrøret 3 bevæges som en samlet enhed, idet stemplet udvendigt har pakningsmidler i radialretningen, som pakker mod den indvendige overflade af en cylinder 7. Cylinderen 7 er fæstnet direkte eller indirekte i aksialretningen mod den omkransende rørflange 4. Stemplet 6 har en første aksial side 8 og modsat denne en anden aksial side, som hver trykpåvirkes via hver sin tilslutningstuds 25, 26 for fx trykluft eller hydraulikolie. Ved at styre trykforskellen mellem fluidtrykket i de to tilslutningsstudse i relation til arealerne af de to annulære stempelsider 8,9 er det muligt at få en resulterende kraft på stemplet i aksialretningen og herigennem kan den aksielle position af centerrøret 3 påvirkes. Fluidet der tilledes de to hulrum i tilslutning til henholdsvis den ene og den anden side af det annulære stempel 6 holdes adskilt fra flowkanalen via passende pakninger mellem centerrøret og indadrettede fanger på cylinderen 7.Around the center tube 3 is mounted an annular piston 6, which is internally coupled in the axial direction to the center tube, so that this piston 6 and the center tube 3 are moved as a total unit, the piston having radially exterior gasket packing against the inner surface of a cylinder. 7. The cylinder 7 is attached directly or indirectly in the axial direction to the surrounding tube flange 4. The piston 6 has a first axial side 8 and opposite to it a second axial side, each of which is actuated via each of its connecting nozzles 25, 26 for e.g. compressed air or hydraulic oil. By controlling the pressure difference between the fluid pressure in the two connecting rods in relation to the areas of the two annular piston sides 8,9, it is possible to obtain a resultant force on the piston in the axial direction and thereby the axial position of the center tube 3 can be affected. The fluid supplied to the two cavities adjacent to one and the other side of the annular piston 6, respectively, is kept separate from the flow channel through appropriate gaskets between the center tube and inwardly directed prisoners on the cylinder 7.

Når centerrøret 3, som vist i fig. 6 og fig. 4 er forskudt væk fra sædepakningen 15 vil den alternative flowkanal 5 være åben, og denne flowkanal omfatter som vist en annulært område dannet af et rørstykke 13 omkransende centerrøret 3. Rørstykket 13 omfatter tillige en sugestuds 23 således at der etableres en fluidpassage fra flowkanalen 10 og ud i den alternative flokanal 5 radielt i forhold til centerrøret. Hermed bliver det muligt at sende rensevæske gennem centerrøret 3 og ud i den alternative flowkanal med afspærreventilen lukket som vist i fig. 4 for herved at rense de dele af afspærreventilen, der vender mod centerrøret. Under en sådan renseproces kan afspærreventilen bringes til at skifte stilling for tillige at rense såvel ventilsædet som dele af ventilen, som ellers i dens lukkede tilstand vender væk fra centerrøret.When the center tube 3, as shown in FIG. 6 and FIG. 4 is offset from the seat gasket 15, the alternative flow channel 5 will be open and this flow channel comprises, as shown, an annular area formed by a pipe piece 13 encircling the center pipe 3. The pipe piece 13 also comprises a suction nozzle 23 so that a fluid passage from the flow channel 10 is established. out into the alternative floc channel 5 radially relative to the center tube. This makes it possible to send cleaning fluid through the center pipe 3 and out into the alternative flow channel with the shut-off valve closed as shown in FIG. 4 to clean the parts of the shut-off valve facing the center pipe. During such a cleaning process, the shut-off valve can be made to change position to also clean both the valve seat and parts of the valve, which otherwise in its closed state turns away from the center pipe.

Det bemærkes at sugestudsen 23 via en ventil og en rørforbindelse med et renserør 27 til en pumpe 24 kan tilføres et passende undertryk så rensevæske kan trækkes gennem systemet. Væsken tilføres via en spraykugle 22 også vist i fig. 7 i lagerbeholderen 21. Hermed kan hele system gennemskyldes med rensevæske, så alle aflejringer, som pulveret i tanken 21 har tendens til at danne, på de flader det kommer i forbindelse med, kan fjernes.It is noted that the suction nozzle 23 via a valve and a pipe connection with a cleaning pipe 27 to a pump 24 can be supplied with a suitable vacuum so that cleaning fluid can be drawn through the system. The liquid is supplied via a spray ball 22 also shown in FIG. 7, the entire system can be purged with cleaning liquid so that all deposits that the powder in the tank 21 tends to form on the surfaces it comes into contact with can be removed.

Som det ses i fig. 1 er der en første boltesamling 16 mellem en indadrettet flange af rørstykket 13 og den omkransende rørflange 4, og yderligere ses i fig. 1 en anden boltesamling mellem centerrøret 3 og rørstykket 13. Cylinderen 7, rørstykke 13 og den omkransende rørflange 4 udgør derfor et samlet hele og det er i forhold hertil, at centerrøret 3 er bevægeligt.As seen in FIG. 1, there is a first bolt assembly 16 between an inward flange of the pipe piece 13 and the surrounding tube flange 4, and further seen in FIG. 1 shows another bolt assembly between the center pipe 3 and the pipe piece 13. The cylinder 7, pipe piece 13 and the surrounding pipe flange 4 therefore constitute an overall whole and it is in this respect that the center pipe 3 is movable.

Afspærreventilen 1 er vist i fig. 1 og er her en butterflyventil, men andre typer af afspærreventiler vil kunne anvendes. Butterflyventilen har en drejelig ventilklap, og gennem en spindel 28, som er ført ud radielt gennem en åbning i den omkransende rørflange 4 kan ventilklappen roteres og stilles så den blokere åbningen i rørflangen, som det ses i fig. 2, fig. 3 og fig. 4. Alternativt kan ventilklappen roteres, så den lader åbningen fri hvilket er vist i fig. 5 og 6. Indlejret i den omkransende rørflange 4 er der tilvejebragt en fleksibel pakning 29. I det aktuelle udførelseseksempel er rørflangen udformet af to parter, hvor den ene part vender mod den lukkede blandetank 18 og den anden vender mod centerrøret 3, hvor tillige den fleksible pakning 29 er indlejret mellem de to parter af rørflangen 4. Den første boltesamling 16 holder de to dele af den omkransende rørflange 4 10 sammen.The shut-off valve 1 is shown in FIG. 1 and is here a butterfly valve, but other types of shut-off valves may be used. The butterfly valve has a rotatable valve flap, and through a spindle 28 extended radially through an opening in the surrounding tube flange 4, the valve flap can be rotated and positioned to block the opening in the tube flange as seen in FIG. 2, FIG. 3 and FIG. 4. Alternatively, the valve flap may be rotated to release the aperture shown in FIG. 5 and 6. Embedded in the surrounding tube flange 4, a flexible gasket 29 is provided. In the present embodiment, the tube flange is formed of two parts, one of which faces the closed mixing tank 18 and the other faces the center tube 3, where it also flexible gasket 29 is embedded between the two parts of the pipe flange 4. The first bolt assembly 16 holds the two parts of the surrounding tube flange 4 10 together.

HenvisningstalNumeral

Afspærreventil procesanlæg centerrør omkransende rørflange alternativ flowkanal annulært stempel cylinder første aksiale side af annulære stempel anden aksiale side af annulære stempel afspærbar flowkanal første ende af centerrøret pakningsflade mod cylinderens inderside rørstykke pakningsmidler mod udvendig side af centerrør sædepakning første boltesamling anden boltesamling lukket blandetank indløb fleksibel slange eller rør lagerbeholder spraykugle sugestuds pumpe tilslutningsstuds til første aksiale side tilslutningsstuds til anden aksiale side renserør spindel fleksibel pakningShut-off valve process plant center pipe encircling pipe flange alternate flow channel annular piston cylinder first axial side of annular piston second axial side of annular piston lockable flow channel first end of the center tube gasket surface against the inside of the cylinder pipe piece gasket means on the outside of the center tube sealing gasket pipe storage tank spray ball suction pump pump connection nozzle to first axial side connection nozzle to second axial side cleaner pipe spindle flexible gasket

Claims

P A T E N T K R A V

A method for cleaning shut-off valve (1) for coatings after use, wherein the shut-off valve (1) in its mounted state in a process plant (2) goes through a number of cleaning steps comprising rinsing with rinse aid, hot steam heating and low pressure drying, wherein at least one rinsing rinse is performed with the shut-off valve (1) closed, wherein a center tube (3) conducting material to or from the shut-off valve (1) is guided in its axial direction toward or away from a pipe flange (4) which circumferences the shut-off valve (1), wherein the center tube (3):

a. In a first use situation, the gasket is fed in its entire circumference against the circumferential pipe flange (4) and where the shut-off valve (1) here

either open and allow material to pass through the shut-off valve (1) and through the center tube (3), or ii. is closed and blocked for material transport through the shut-off valve (1) and thus also closes the center pipe (3),

b. In another use situation intended for cleaning the shut-off valve (1), in its axial direction, it is moved back away from the circumferential pipe flange (4), thereby opening an alternative flow channel (5) perpendicular to the longitudinal axis of the center pipe (3) and where the shut-off valve (1) ) here:

either open and allow material transport through the center pipe and through the alternate flow channel (5) and through the shut-off valve (1); ii. is closed so that there is only transport through the center pipe (3) past the shut-off valve (1) and through the alternative flow channel (5).

Method according to claim 1, characterized in that the center tube (3) is moved in its axial direction by establishing a pressure difference between the two sides of an annular piston (6), which is connected axially to the center tube (3), with the annular piston (6). ) externally seals against a cylinder (7) which is held against the surrounding tube flange (4).

3. Shut-off valve (1) mounted in a pipe flange (4) and a switchable center pipe (3) coupled to the pipe flange (3), where the center pipe (3) and pipe flange (4) thereby constitute a detachable flow channel (10) characterized by an alternative flow channel ( 5) comprises a closable annular passage between a first end of the center tube (3) and the tube flange (4).

Shut-off valve according to claim 3, characterized in that the center pipe (3) is mounted axially movable in a cylinder (7) coupled to the pipe flange (4) and that an annular piston (6) with two axial sides (8,9) is axially fixed to and surrounding the center tube (3), forming a gasket surface (12) against the inside of the cylinder such that a pressure difference between the two axial sides of the piston (8,9) will move the center tube (3) toward or away from the tube flange (4).

A shut-off valve according to claim 4, characterized in that a pipe piece (13) is arranged adjacent to the tube flange (4) and the surrounding center tube (3), which surrounds the alternative flow channel (5) and is fixed to the cylinder (7), which cylinder (7) also comprises packing means (14) towards an outside side of the center tube (3) so that the center tube (3) is axially displaceable relative to cylinder (7).

A shut-off valve according to claim 5, characterized in that a seat gasket (15) is arranged in the region between the first end (11) of the center tube (3) and the tube flange (4).

Shut-off valve according to claim 4, characterized in that the shut-off valve (1) mounted in the pipe flange (4) is a butterfly valve.

Shut-off valve according to claim 6, characterized in that the pipe piece (13) is attached to the pipe flange (4) via a first bolt assembly (16) and the cylinder is coupled to the pipe flange (4) via a second bolt assembly (17) between the cylinder (7). ) and the pipe piece (13).