CA2179429A1 - Valve device - Google Patents
Valve deviceInfo
- Publication number
- CA2179429A1 CA2179429A1 CA 2179429 CA2179429A CA2179429A1 CA 2179429 A1 CA2179429 A1 CA 2179429A1 CA 2179429 CA2179429 CA 2179429 CA 2179429 A CA2179429 A CA 2179429A CA 2179429 A1 CA2179429 A1 CA 2179429A1
- Authority
- CA
- Canada
- Prior art keywords
- channel
- throughflow area
- throughflow
- area
- seating
- 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.)
- Abandoned
Links
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01J—MANUFACTURE OF DAIRY PRODUCTS
- A01J7/00—Accessories for milking machines or devices
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01J—MANUFACTURE OF DAIRY PRODUCTS
- A01J5/00—Milking machines or devices
- A01J5/04—Milking machines or devices with pneumatic manipulation of teats
- A01J5/10—Pulsators arranged otherwise than on teat-cups
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Animal Husbandry (AREA)
- Environmental Sciences (AREA)
- External Artificial Organs (AREA)
Abstract
An apparatus has a channel (5) for a fluid and a member (8) adapted to accomplish a first throughflow area in a first position in the channel and a second throughflow area in a second position in the channel. The member (8) is adjustable for accomplishing a third throughflow area, which is different from the first throughflow area, when the member is in the first position. Alternatively, the apparatus consists of a set of parts comprising three interchangeable members, for achieving different throughflow areas in the channel. A milking equipment (20) has a pulsator (27) adapted to communicate with the pulsation space in each teatcup via an apparatus (D) of the above described kind.
Description
~ WO 95/18323 217 9 4 2 9 PCT~SE94/01250 Valve device The present invention relates to an d~l!dldLus comprising a housing forming a channel for a reciprocating fluid, 5 and a member arranged in the channel and adapted to A' 1 i qh a first throughflow area in a first position, for said fluid and to Al 1 i ch a second throughflow area in a second position for said fluid in the channel.
Such an apparatus is known from SE-3-373 727.
The invention also relates to an apparatus comprising a housing forming a channel for a reciprocating fluid and a member arranged f reely movable in the channel between 2 first and a second posltion in the channel, without 15 stopping the fluid flow. Such an apparatus is known from SE-A-8602678-8 .
SE-~-373 727 describes a valve device intended to be placed in a teat liner for a milking machine for 20 preventing rl~qrlAqhin~ of milk in the teat liner, which may cause pains in the cow ' s teat. When the valve device is closed there is a pr~cslh~lity for a certain reflow of the milk through a passage in the valve. In this way the said first throughflow area is achieved. When the valve 25 is open said second throughflow area is achieved.
SE-A-8602678-8 describes a pulsation indicator intended to be arranged in a pulsation tube between a pulsator and a teatcup in a milking machine. ~he pulsation 30 indicator comprises a ball in an elongated, Llc~ L
housing. During operation, when the pulsator alternates between normally underpressure and the atmospheric pressure, the pressure alternation can be checked by observing the v, L of the ball back and forth in the 35 transparent housing.
Such an apparatus is known from SE-3-373 727.
The invention also relates to an apparatus comprising a housing forming a channel for a reciprocating fluid and a member arranged f reely movable in the channel between 2 first and a second posltion in the channel, without 15 stopping the fluid flow. Such an apparatus is known from SE-A-8602678-8 .
SE-~-373 727 describes a valve device intended to be placed in a teat liner for a milking machine for 20 preventing rl~qrlAqhin~ of milk in the teat liner, which may cause pains in the cow ' s teat. When the valve device is closed there is a pr~cslh~lity for a certain reflow of the milk through a passage in the valve. In this way the said first throughflow area is achieved. When the valve 25 is open said second throughflow area is achieved.
SE-A-8602678-8 describes a pulsation indicator intended to be arranged in a pulsation tube between a pulsator and a teatcup in a milking machine. ~he pulsation 30 indicator comprises a ball in an elongated, Llc~ L
housing. During operation, when the pulsator alternates between normally underpressure and the atmospheric pressure, the pressure alternation can be checked by observing the v, L of the ball back and forth in the 35 transparent housing.
3 ~? 9 PCTISE94/01250 CH-A-508 144 discloses a valve for achieving different flow resistances in opposing directions of a flow of a liquid. In two of the four disclosed embodiments, a valve member is formed as a ball having a density lower 5 than the liquid, whereas in the two other embodiments, the valve member is iormed as a movable flap. Two different throughflow areas are possible to achieve in each of the four embodiments.
US-A-3 138 177 discloses a flow control device for drinking fountains, lavatories, washing r-c'hin~.c or the like, having a liquid flow in one direction. The liquid flow is rendered constant, disregarding the liquid pressure by means of a valve member, which, due to the 15 liquid pressure, is gradually caused to sink into a resilient member to a compressive engagement with one another .
US-A-631 036 discloses a check valve for preventing t~he 20 flow of a fluid from taking a direction opposite to a single desired flow direction. To reverse the valve, a valve member is turned instead of turning a whole valve housing .
25 A conventional milking machine connected to a pneumatic pressure source operates with relatively fast alter-nations between underpressure and atmospheric pressure alternatively underpressure and overpressure. Research has proven that these quick pressure alternations may be 30 trollhl ~c for certain cows, having sensitive teats.
According to a method known from W0 92/12625, slower pressure alternations can be ~( 1 i ch~fl, which substantially reduces said trouble.
WO 95/18323 2 ~ 7 9 4 2 ~ PCI/SE94/01250 An ob~ect of the present invention is to a~ ch a simple apparatus for carrying out said known method.
Another ob~ect of the invention is to accomplish such an 5 apparatus, which can be utilized in a milking machine for milking of differently sensitive cows, i.e. if quick pressure alternations are desired during milking of insensitive cows the apparatus shall also be ad~ustable f or this in an easy way .
Yet another ob~ect of the invention is to obtain such an apparatus, which is adjustable to a plurality of different pressure alternations.
15 These ob~ects are ~ , 1 i eh~(l by means of an apparatus of the initially described kind, which is characterized in that the member is adjustable such that it accomp-lishes a third throughflow area, which is different from the first throughflow area when the member is in the 20 first position. Hereby, a simple adjustment rnss~hlllty of the pressure alternations is achieved.
Furth~ - t: these ob ~ects are ~ 1 { chPrl by an apparatus of the thereafter described kind which is 25 characterized in that the member is adapted to change the throughflow area in the channel when the member is at least in the first position. Hereby, an alternative, simple ad~ustment possibility of the pressure alter-nations is achieved.
Furth~ ~ a rnc:.sl hl 11 ty of adapting the speed of each pressure alternation to a desired value is achieved.
Preferably, the first throughflow area is smaller than 35 the second throughflow area, and the third throughflow ~ g PCr/SE94/01250 area is larger than the first and substantially as large as the second. Hereby, a milking machine which is provided with an apparatus according to the invention may for example be operated such that said pressure 5 alternations comprise relatively slow pressure drops but relatively fast pressure increases or vice versa.
Suitably, said housing has a transparent portion, whereby the pressure alternations can be indicated by 10 visual observation of the member ' s movement .
Advantageously, seatings are provided in the channel, against which seatings the member abuts when it takes said positions, and the member is formed with at least 15 one central passage. Furth~ ~ :, it is advantageous to provlde the member with at least one peripheral passage, so that a desired throughflow area can be chosen.
The first throughflow area is formed in a desired case, 20 suitably by the member ' s central passage when the member abuts the first seating. Furthr t:, the second throughflow area is formed by the member's central and peripheral passages when the member abuts the second seating. When the member is in its first position and is 25 adjusted to ~ 1 i qh said third throughflow area, this is formed by the member ' s central and peripheral passages .
Preferably, the housing comprises at least two, 30 releasably interconnected parts, whereby the member is ~ro~Rg~hle for r-e~nln~ and for said adjustment for ~, _lich~n~ the third throughflow area, which ad~ust-ment advantageously is ~: ,1 i qh~ by turning the member in the channel.
-~ wos~/18323 2g ~ / ~, i PCTISE941012~0 Furthermore, said ob ~ects are A~ 1 i ch-~(1 by an apparatus consisting of a set of parts and comprising a disconnectible housing, which forms a channel for a fluid; three inte~ c:able members, which are each 5 movable in the channel between a first and a second position; and means adapted to indicate the v. ~ of each member; wherein a first member is adapted to .e , 7 i ~h a first through-lO flow area in said first position, and to accomplish a second throughflow area in said second position, wherein the first throughflow area is different from the second throughf low area;
15 a second member is adapted to accomplish a reduced first throughflow area in the channel in said first position and to A~ h a reduced second throughf low area in the channel in said second positon, wherein the first throughflow area is substantially as large as the second 20 throughflow area; and whereln a third member is adapted to ~, , 1 i ~h a substantially unreduced first throughflow area in the channel in said first position and to i~ ,1 i Ch a substantially 25 unreduced second throughflow area in the channel in said second position wherein the first throughflow area is substantially as large as the second throughflow area.
Hereby is achieved an apparatus, which is ad~ustable to 30 a plurality of desired pressure alternations, having varying flow characteristics.
The invention will now be described more closely in connection with the annexed drawings, in which WO 9~/18323 ~ 9 ~ 9 PCT1SE941012S0 Figure lA shows a first ~ ' _'i L of an apparatus according to the invention with a member in a first -position, 5 Figure lB shows the same apparatus as figure lA, but with the member ln a second position, Figure lC shows a section along the line lC-lC in figure lA, Figure lD shows an enlarged view of a longitudinal section through the member in the apparatus ~,-r.,rl~in~ to figures lA and lB, 15 Figure 2A shows the same apparatus as figure lA, with the member in the f irst position but with a changed adj ustment of the member, Figure 2B shows the same apparatus and ad~ustment of the 20 member as fi~ure 2A, but with the member in the second position, Figure 2C shows a section along the line IIC-IIC in f igure 2A, Figure 3A shows a second pmh~1r'~ t of an apparatus ~
according to the invention with the same member as in f igure lA, 30 Figure 3B shows the same apparatus as figure 3B, but with changed ad~ustment of the member, Figure 3C shows the same apparatus as figure 3A, but provided with a first modified member, Wo 95~18323 2~ j . PCTJSE94/0l251) Figure 3D shows the same apparatus as figure 3A, but provided with a second modified member, Figure 4 shows schematically a milking equipment 5 including two apparatuses according to the invention, Figure 5A shows with a continuous line a normal pulsation curve for a conventional milking machine describing the pressure change in a pulsation chamber of 10 a teatcup with liner, and with broken line how an apparatus according to the invention connected to the milking machine influences an introductive phase of the pulsation curve.
15 Figure 5B shows with a continuous line the same normal pulsation curve as figure 5A, and with broken line how an apparatus according to the invention connected to the milking machine influences a f;n~eh1n~ phase of the pulsation curve.
Figure 5C shows with a continuous line the same normal pulsation curve as figure 5A and with broken line how an apparatus according to the invention connected to the milking machine influences the introductory as well as 25 the f1n1qhln~ phase of the pulsation curve.
Figure lA shows a first embodiment of an apparatus D
according to the invention comprising a housing 1 with a first part 2 and a second part 3. The first part 2 of 30 the housing is formed as a male member with external threads 4a, which male member forms a throughgoing, first circular cylindrical channel 5. The second part 3 of the housing is formed as a female member which comprises a first portion 3a, forming a throughgoing, 35 second circular cylindrical channel 6, which has the WO95/18323 ~9479 PCT/SE:9-1/01250 1 same diameter as the f irst channel 5, a second portion 3b forming a third circular cylindrical channel 7 with larger (l;~ L~l than the second channel 6, and a third portion 3c formed with internal threads 4b. The female 5 member receives the male member such that the threads 4b of the third portion engage with the threads 4a of the male member, wherein the second part ' s channel 7 forms an elongated circular cylindrical chamber. The first channel 5, as well as the second channel 6, discharges 10 coaxially via openings 5a, 6a in the chamber 7.
Alternatively, other means for connection of the housing ' s male and the female member may be used, such as a snap ~oint, a bayonet ~oint, a ball spring ~oint, a 15 hose clamp etc.
An o-ring R or some other suitable sealing means is arranged between the male member 2 and the female member 3 for sealing between the same.
A member 8 intended to be loosely arranged in the chamber 7 comprises a plate 9 with a substantially circular cross-section, wherein a passage 10 extends centrally through the plate 9. The plate 9 has a smaller 25 diameter than the chamber 7 and is provided with four symmetrically arranged radial protrusions lla-d cooperating with the chamber ' s 7 circumferential wall such that the plate 9 is ~ Led in the chamber 7. Each of the radial protrusions lla-d has a first axial 30 protrusion 12 extending from the plate 9 in one direc-tion along the chamber 7, and a second a~ial protrusion 13, extending from the plate 9 in the opposite direction along the chamber 7. The radial protrusions lla-d have the same radial extension from the plate 9.
WO95/183~3 9~2g ~ PCT/SE94J01250 The first axial protrusions 12 are shorter and have less radial extension a seen from the chamber ' s 7 circum-ferential wall than the other axial protrusions 13.
5 The member 8 can move f reely in the chamber 7 between the first throughgolng channel 's opening 5a, about which a first seating 14 for the member 8 is formed on the male member 2, and the ~ second throughgoing channel ' s opening 6a about which a second seating 15 for the 10 member is formed on the female member 3 . The chamber ' s 7 circumferential wall, the plate 9 and the plate's 9 radial protrusions lla-d delimit thereby four peripheral passages 16a-d.
15 At least the second portion 3b of the housing 1 is transparent, whereby the movement of the member 8 is visually indlcatable.
Of course, the number of radial protrusions lla-d do not 20 need to be four, but both more or fewer radial protru-sions would be possible to arrange on the plate 9, whereby a varying number of passages are formed depen-ding on the number of radial protrusions. In the same way it would be possible to form the plate 9 such that 25 it gets substantially the same diameter as the chamber 7, i . e. without radial protrusions . Thereby, the axial protrusions 12, 13 are arranged directly on the plate 9 in both axial directions for example in the form of one or several pins or a ring. In this case the plate 9 30 has to be provided with peripheral recesses to form the necessary passages between the plate 9 and the housing 1.
Figure lA and lB show the member 8 oriented in the 35 chamber 7 such that the shorter, first axial protrusions WO 95/18323 ~ 9 4 PCT/SE94101250 12 are closest to the first seatlng 14, whlle the longer, second axlal protruslons 13 are closest to the second seatlng 15. As is described above the housing is ~11qrr~nnF~tible, whereby the member 8 can be turned in the chamber 7 such that the shorter, flrst axlal protrusions 12 are closest to the second seating 15, whereas the longer protruslons 13 are closest to the first seatlng 14, as shown ln flgures 2A and 2B.
The flrst seatlng 14 is formed as a circular cylindrical connection piece S on the male member. Between the connection piece S and the chamber ' s 7 circumferential wall an annular info ~iliAte space 17 is formed, in which the shorter, first axial protrusions 12 with less radial extension a has access (see figure lA). However, the second axial protrusions 13 wlth larger radial extension b do not f it in the intermediate space 17 .
The seating 15 of the second throughgoing channel is formed with an annular surface 18, extending radially from the second throughgolng channel ' s opening 6a towards the periphery of the chamber 7. The axial protrusions 12, 13 are allal~g~d on the plate 9 such that during v - ~ of the member 8 towards the second channel's seating 15 and ~l~r~n~11n~ on the member's 8 orientatlon ln the chamber 7, elther the shorter axial protruslons 12 or the longer axial protrusions 13 will abut the annular surface 18, which hence acts as a stop member for the further ,v~ t of the member 8 (cf. the figures lB and 2B).
Figure 3A shows a second embodiment of an a~ala~ux D' according to the invention comprising a housing 1 ' with a first part 2, a second part 19 and a third part 2', wherein the first part 2 constitutes a first male member Wo 95~18323 1 79 ~ 2 9 PCT/SE94/01250 forming a first throughgoing channel 5, the third part 2 ' constitutes a second male member forming a second throughgoing channel 5 ' and the second part 19 consti-tutes a transparent sleeve with two free ends l9a, l9b 5 and forms a double female member. The both male members 2, 2' and the sleeve 19 define a central chamber 7', wherein the first male member 2 and the second male member 2 ' form a first seating 14 and a second seatiny 14 ', respectively, in the central chamber 7 ' . The first 10 male member 2 as well as a first portion l9c of the sleeve, is formed with a righthand thread 4a, 4b, where-as the other male member 2 ' as well as a second portion of the sleeve l9d is formed with a lefthand thread 4a ', 4b ' . The sleeve 19 can hereby be taken away from the 15 male member 2, 2 ' without need for twisting tubes or pipes connected to the male members 2, 2 ', since the male members 2, 2 ' only perform a pure translational ,v~ ~ during rotatlon of the sleeve 19.
20 A member 8 of the same kind as has been described in connection with the first ~mho~l 1 according to figures lA-2C is intended to be arranged in the chamber 7 ' 25 The first as well as the second male member's seating 14 and 14 ', respectively, is provided with a connection piece S and S ', respectively. Between the respective connection piece S and S ' and the chamber ' s 7 circum-ferential wall an annular interspace 17 and 17 ', respec-30 tively, is formed, in which the shorter, first axialprotrusion 12 with less radial extension a has access ( see figure 3A~ . However, the second axial protrusion 13 with larger radial extension b does not fit in the W095/18323 ~94~,9 PCTISE94/01250 annular interspace 17 and 17 ' 7 respectlvely ( see f igure 3B ) .
It is possible to exchange the member 8 by a symmetrical 5 member, which is provided with similar axial protrusions 12, 12'; 13, 13' in both axial directions, i.e. all axial protrusions have either~ a less radial extension a (see figure lD and the member 8' in figure 3C) or a larger radial e~tension b ( see figure lD and the member 10 8 " in figure 3D ) .
Figure 4 shows a milking equipment 20 comprising a first, a second, a third and a fourth teatcup 21a-d with shell 22a-d and liner 23a-d, wherein four pulsation 15 spacas formed between the shells and the liners (not shown) are connected by means of four tubings 24a-d to a claw piece 25. The first and the second teatcup 21a, b are both connected to a iirst inner partial space 25a of the claw piece 25 while the third and the fourth teatcup 20 21c, d are connected to a second inner partial space 25b. ~he first and the second partial spaces 25a, b are connected via tubings 26a, b, respectively, to a pulsa-tor 27, which in turn is connected to a vacuum pump 28.
25 In the respective tubing 26a, b between the claw piece 25 and the pulsator 27 an c~a.al us D or D' according to the invention is provided, wherein the first through-going channel 5 is connected closest to the pulsator and the second throughgoing channel 6, 5 ' is connected 30 closest to the claw piece 25. The central passage 10 of the member 8, 8 ', 8 " in each apparatus D, D ' has a smaller area than the throughflow area of each tubing 26a, b.
~WOgS/18323 1 79~2~ 13 PCT/SE94/012~0 With the milking e~luipment 20 in operation the vacuum pump 28 generates a vacuum in the pulsator 27. The pulsator is adapted to cyclicly f irst connect the pulsation spaces of the first and the second teatcups 5 21a, b to vacuum while the pulsation spaces of the third and fourth teatcups 21c, d are connected to the atmos-phere. Thereafter, the pulsator shifts such that the pulsation spaces of the thir~ and the fourth teatcups 21c, d are connected to vacuum, while the pulsation 10 spaces of the first and second teatcups 21a, b are connected to the a -, h~e The cyclic pressure variation which hereby arises in each pulsation space, is illustrated in the figures 15 5A-5C, where the phase a shows the y~lelclL~:d pressure drop from the a i ~sph~ic pressure alternatively the overpressure Pl to the underpressure P2, when the liner is opened, the phase b shows the desired applied under-pressure P2, when the liner is open, the phase c shows 20 the increase of pressure from the underpressure P2 to the atmospheric pressure alternatively the overpressure Pl, when the liner is closed, and the phase d shows the recovery period of the teat when the liner is closed, before the cycle is repeated.
As mentioned above, it is sometimes desirable to change this pulsation curve especially such that the a- and/or the c-phase gets slower. As a consequence of this the liner will move slower during opening and closing of the 30 interior of the liner. Prolonged a-phase, i . e . slower opening of the interior of the liner, results in that the teat manages better to expand radially and to keep its frictional grip with the liner, whereby the teatcup iS ~l~v~ d from r.l 1mhln~ upwards on the teat towards 35 the udder and causing throttling of the teat ' s milk 9~
conducting interior in the vicinity of the udder. Such a rl ~r:~n~ of the teatcup aggravates the milking and gives rise to an increased amount of rest milk. Prolonged c-phase, i.e. slower closing of the liner's interior 5 results in that the teat is treated more leniently by the liner .
According to the present invention an extended a-phase is achieved by means of the apparatus according to lO figures lA-lD or figure 3A, wherein the first through-going channel 5 is provided closest to the pulsator 27 and the other throughgoing channel 6, 5 ' is provided closest to the claw piece 25 . = When the pulsator 27 creates a vacuum in the chamber 7 the member 8 is sucked 15 against the first seating, i.e. against the connection piece S with the member's first axial protrusion 12 astraddling the connection piece S such that the plate 9 of the member 8 abuts the connection p$ece ( see f igure lA and 3A, respectively). Hereby, the first channel 5 20 , i ~-~tes with the chamber 7 substantially only via the member ' s 8 central passage 10 . As a consequence of this the a-phase will be prolonged as shown by means of the broken curve line in figure 5A; since it takes longer time to evacuate the pulsation spaces via the 25 central passages 10 than via a tubing 26a, b which lacks ~n apparatus D, D ' according to the invention.
During the b-phase, when the pulsation space in the teatcup is evacuated, the pressure in the chamber 7 is 30 substantially constant. When the pulsator 27 causes atmospheric pressure alternatively overpressure in the chamber 7, the member 8 is sucked alternatively pushed towards the other seating 15, 14 ', where the other channel 6, 5 ' communicates with the chamber 7 via the 35 member ' s 8 central as well as its peripheral passages WO 95/18323 21 7 9 ~l 2 9 PCT/SE94~01250 10, 16a-d. Hereby, the pulsation curve keeps its normal character in the c-phase (see figure 5A).
In some cases it may be desirable to achieve a normal a-phase and a prolonged c-phase ( see the broken curve line in the pulsation curve in figure 5B ) . This is achieved by turning the apparatus according to figure lA-lD or figure 3A in the tubing 26a, 26b, respectively, so that the second throughgoing channel 6, 5 ' is closest to the pulsator 27 and the first throughgoing channel 5 is closest to the claw piece 25. Hereby, it takes a longer time to fill the pulsation spaces, since the air can only pass through the member's 8 central passage 10 during the c-phase.
Alternatively, the apparatus D ' accordlng to the second embodiment is used with the member 8 turned according to figure 3B. Then the first channel 5 communicates with the chamber 7 ' via the member ' s 8 central and peripheral passages 10, 16a-d, while the second channel 5 ' communi-cates with the chamber 7 ' only through the member ' s 8 central passage 10.
If both the a- and the c-phase is to be prolonged as shown with broken curve lines in figure 5C, an apparatus D ' according to the second embodiment is usQd with the modified member 8 ' according to figure 3C. Hereby the first and the second throughgoing channel 5, 5 ', respec-tively, communicates with the chamber 7 ' only via the member's 8 central passage lO, when the pulsation space is evacuated and f illed with air, respectively .
Alternatively, two opposedly directed apparatuses D
according to the first embodiment as shown in figure Wo 95/18323 PCTISE94/012~0 ~94~9 16 2~
lA-lD is used in each tubing 26a, 26b, whereby the same result is achieved ( prolonged a-phase and c-phase ) .
If an l~nrhAn~r tl pulsation curve is desired (which may be 5 suitable during milking of certain, hardy cows ), as shown by means of a continuous curve line in the figures 5A-C, the most simple measure is to take away the member 8 from the chamber 7, 7' but then the EQe~lhtlity dis-appears to indicate the pulsation. For this reason an lO apparatus according to the first embodiment is used in this case with turned member 8, as shown in figure 2A-2B . Alternatively an apparatus D ' according to the second embodiment with the rttflP~ member 8" shown in figure 3D is used. From this follows that the first and 15 the second throughgoing channel 5, 5 ', respectively, trAteS with the chamber 7, 7' through the members' 8, 8" central as well as peripheral passages 10, 16a-d, respectively, when the pulsation space is evacuated and filled with air, respectively, whereby the apparatus D
20 indicates the pulsation without causing more than an insignificant pressure drop in the tubing 26a, b.
The present invention is of course not limited to be used in milking eq~l;, L~. Accordingly, it may also be 25 used for other purposes, such as r.ll~ntn~ of pipes in general with a suitable liquid or a gas, which could be abrasive. In this case, the ~L,aL~Lus according to the invention is utilized to change the abrasive effect of the fluid, such that the flow is rendered slower or 30 faster in different flow directions.
US-A-3 138 177 discloses a flow control device for drinking fountains, lavatories, washing r-c'hin~.c or the like, having a liquid flow in one direction. The liquid flow is rendered constant, disregarding the liquid pressure by means of a valve member, which, due to the 15 liquid pressure, is gradually caused to sink into a resilient member to a compressive engagement with one another .
US-A-631 036 discloses a check valve for preventing t~he 20 flow of a fluid from taking a direction opposite to a single desired flow direction. To reverse the valve, a valve member is turned instead of turning a whole valve housing .
25 A conventional milking machine connected to a pneumatic pressure source operates with relatively fast alter-nations between underpressure and atmospheric pressure alternatively underpressure and overpressure. Research has proven that these quick pressure alternations may be 30 trollhl ~c for certain cows, having sensitive teats.
According to a method known from W0 92/12625, slower pressure alternations can be ~( 1 i ch~fl, which substantially reduces said trouble.
WO 95/18323 2 ~ 7 9 4 2 ~ PCI/SE94/01250 An ob~ect of the present invention is to a~ ch a simple apparatus for carrying out said known method.
Another ob~ect of the invention is to accomplish such an 5 apparatus, which can be utilized in a milking machine for milking of differently sensitive cows, i.e. if quick pressure alternations are desired during milking of insensitive cows the apparatus shall also be ad~ustable f or this in an easy way .
Yet another ob~ect of the invention is to obtain such an apparatus, which is adjustable to a plurality of different pressure alternations.
15 These ob~ects are ~ , 1 i eh~(l by means of an apparatus of the initially described kind, which is characterized in that the member is adjustable such that it accomp-lishes a third throughflow area, which is different from the first throughflow area when the member is in the 20 first position. Hereby, a simple adjustment rnss~hlllty of the pressure alternations is achieved.
Furth~ - t: these ob ~ects are ~ 1 { chPrl by an apparatus of the thereafter described kind which is 25 characterized in that the member is adapted to change the throughflow area in the channel when the member is at least in the first position. Hereby, an alternative, simple ad~ustment possibility of the pressure alter-nations is achieved.
Furth~ ~ a rnc:.sl hl 11 ty of adapting the speed of each pressure alternation to a desired value is achieved.
Preferably, the first throughflow area is smaller than 35 the second throughflow area, and the third throughflow ~ g PCr/SE94/01250 area is larger than the first and substantially as large as the second. Hereby, a milking machine which is provided with an apparatus according to the invention may for example be operated such that said pressure 5 alternations comprise relatively slow pressure drops but relatively fast pressure increases or vice versa.
Suitably, said housing has a transparent portion, whereby the pressure alternations can be indicated by 10 visual observation of the member ' s movement .
Advantageously, seatings are provided in the channel, against which seatings the member abuts when it takes said positions, and the member is formed with at least 15 one central passage. Furth~ ~ :, it is advantageous to provlde the member with at least one peripheral passage, so that a desired throughflow area can be chosen.
The first throughflow area is formed in a desired case, 20 suitably by the member ' s central passage when the member abuts the first seating. Furthr t:, the second throughflow area is formed by the member's central and peripheral passages when the member abuts the second seating. When the member is in its first position and is 25 adjusted to ~ 1 i qh said third throughflow area, this is formed by the member ' s central and peripheral passages .
Preferably, the housing comprises at least two, 30 releasably interconnected parts, whereby the member is ~ro~Rg~hle for r-e~nln~ and for said adjustment for ~, _lich~n~ the third throughflow area, which ad~ust-ment advantageously is ~: ,1 i qh~ by turning the member in the channel.
-~ wos~/18323 2g ~ / ~, i PCTISE941012~0 Furthermore, said ob ~ects are A~ 1 i ch-~(1 by an apparatus consisting of a set of parts and comprising a disconnectible housing, which forms a channel for a fluid; three inte~ c:able members, which are each 5 movable in the channel between a first and a second position; and means adapted to indicate the v. ~ of each member; wherein a first member is adapted to .e , 7 i ~h a first through-lO flow area in said first position, and to accomplish a second throughflow area in said second position, wherein the first throughflow area is different from the second throughf low area;
15 a second member is adapted to accomplish a reduced first throughflow area in the channel in said first position and to A~ h a reduced second throughf low area in the channel in said second positon, wherein the first throughflow area is substantially as large as the second 20 throughflow area; and whereln a third member is adapted to ~, , 1 i ~h a substantially unreduced first throughflow area in the channel in said first position and to i~ ,1 i Ch a substantially 25 unreduced second throughflow area in the channel in said second position wherein the first throughflow area is substantially as large as the second throughflow area.
Hereby is achieved an apparatus, which is ad~ustable to 30 a plurality of desired pressure alternations, having varying flow characteristics.
The invention will now be described more closely in connection with the annexed drawings, in which WO 9~/18323 ~ 9 ~ 9 PCT1SE941012S0 Figure lA shows a first ~ ' _'i L of an apparatus according to the invention with a member in a first -position, 5 Figure lB shows the same apparatus as figure lA, but with the member ln a second position, Figure lC shows a section along the line lC-lC in figure lA, Figure lD shows an enlarged view of a longitudinal section through the member in the apparatus ~,-r.,rl~in~ to figures lA and lB, 15 Figure 2A shows the same apparatus as figure lA, with the member in the f irst position but with a changed adj ustment of the member, Figure 2B shows the same apparatus and ad~ustment of the 20 member as fi~ure 2A, but with the member in the second position, Figure 2C shows a section along the line IIC-IIC in f igure 2A, Figure 3A shows a second pmh~1r'~ t of an apparatus ~
according to the invention with the same member as in f igure lA, 30 Figure 3B shows the same apparatus as figure 3B, but with changed ad~ustment of the member, Figure 3C shows the same apparatus as figure 3A, but provided with a first modified member, Wo 95~18323 2~ j . PCTJSE94/0l251) Figure 3D shows the same apparatus as figure 3A, but provided with a second modified member, Figure 4 shows schematically a milking equipment 5 including two apparatuses according to the invention, Figure 5A shows with a continuous line a normal pulsation curve for a conventional milking machine describing the pressure change in a pulsation chamber of 10 a teatcup with liner, and with broken line how an apparatus according to the invention connected to the milking machine influences an introductive phase of the pulsation curve.
15 Figure 5B shows with a continuous line the same normal pulsation curve as figure 5A, and with broken line how an apparatus according to the invention connected to the milking machine influences a f;n~eh1n~ phase of the pulsation curve.
Figure 5C shows with a continuous line the same normal pulsation curve as figure 5A and with broken line how an apparatus according to the invention connected to the milking machine influences the introductory as well as 25 the f1n1qhln~ phase of the pulsation curve.
Figure lA shows a first embodiment of an apparatus D
according to the invention comprising a housing 1 with a first part 2 and a second part 3. The first part 2 of 30 the housing is formed as a male member with external threads 4a, which male member forms a throughgoing, first circular cylindrical channel 5. The second part 3 of the housing is formed as a female member which comprises a first portion 3a, forming a throughgoing, 35 second circular cylindrical channel 6, which has the WO95/18323 ~9479 PCT/SE:9-1/01250 1 same diameter as the f irst channel 5, a second portion 3b forming a third circular cylindrical channel 7 with larger (l;~ L~l than the second channel 6, and a third portion 3c formed with internal threads 4b. The female 5 member receives the male member such that the threads 4b of the third portion engage with the threads 4a of the male member, wherein the second part ' s channel 7 forms an elongated circular cylindrical chamber. The first channel 5, as well as the second channel 6, discharges 10 coaxially via openings 5a, 6a in the chamber 7.
Alternatively, other means for connection of the housing ' s male and the female member may be used, such as a snap ~oint, a bayonet ~oint, a ball spring ~oint, a 15 hose clamp etc.
An o-ring R or some other suitable sealing means is arranged between the male member 2 and the female member 3 for sealing between the same.
A member 8 intended to be loosely arranged in the chamber 7 comprises a plate 9 with a substantially circular cross-section, wherein a passage 10 extends centrally through the plate 9. The plate 9 has a smaller 25 diameter than the chamber 7 and is provided with four symmetrically arranged radial protrusions lla-d cooperating with the chamber ' s 7 circumferential wall such that the plate 9 is ~ Led in the chamber 7. Each of the radial protrusions lla-d has a first axial 30 protrusion 12 extending from the plate 9 in one direc-tion along the chamber 7, and a second a~ial protrusion 13, extending from the plate 9 in the opposite direction along the chamber 7. The radial protrusions lla-d have the same radial extension from the plate 9.
WO95/183~3 9~2g ~ PCT/SE94J01250 The first axial protrusions 12 are shorter and have less radial extension a seen from the chamber ' s 7 circum-ferential wall than the other axial protrusions 13.
5 The member 8 can move f reely in the chamber 7 between the first throughgolng channel 's opening 5a, about which a first seating 14 for the member 8 is formed on the male member 2, and the ~ second throughgoing channel ' s opening 6a about which a second seating 15 for the 10 member is formed on the female member 3 . The chamber ' s 7 circumferential wall, the plate 9 and the plate's 9 radial protrusions lla-d delimit thereby four peripheral passages 16a-d.
15 At least the second portion 3b of the housing 1 is transparent, whereby the movement of the member 8 is visually indlcatable.
Of course, the number of radial protrusions lla-d do not 20 need to be four, but both more or fewer radial protru-sions would be possible to arrange on the plate 9, whereby a varying number of passages are formed depen-ding on the number of radial protrusions. In the same way it would be possible to form the plate 9 such that 25 it gets substantially the same diameter as the chamber 7, i . e. without radial protrusions . Thereby, the axial protrusions 12, 13 are arranged directly on the plate 9 in both axial directions for example in the form of one or several pins or a ring. In this case the plate 9 30 has to be provided with peripheral recesses to form the necessary passages between the plate 9 and the housing 1.
Figure lA and lB show the member 8 oriented in the 35 chamber 7 such that the shorter, first axial protrusions WO 95/18323 ~ 9 4 PCT/SE94101250 12 are closest to the first seatlng 14, whlle the longer, second axlal protruslons 13 are closest to the second seatlng 15. As is described above the housing is ~11qrr~nnF~tible, whereby the member 8 can be turned in the chamber 7 such that the shorter, flrst axlal protrusions 12 are closest to the second seating 15, whereas the longer protruslons 13 are closest to the first seatlng 14, as shown ln flgures 2A and 2B.
The flrst seatlng 14 is formed as a circular cylindrical connection piece S on the male member. Between the connection piece S and the chamber ' s 7 circumferential wall an annular info ~iliAte space 17 is formed, in which the shorter, first axial protrusions 12 with less radial extension a has access (see figure lA). However, the second axial protrusions 13 wlth larger radial extension b do not f it in the intermediate space 17 .
The seating 15 of the second throughgoing channel is formed with an annular surface 18, extending radially from the second throughgolng channel ' s opening 6a towards the periphery of the chamber 7. The axial protrusions 12, 13 are allal~g~d on the plate 9 such that during v - ~ of the member 8 towards the second channel's seating 15 and ~l~r~n~11n~ on the member's 8 orientatlon ln the chamber 7, elther the shorter axial protruslons 12 or the longer axial protrusions 13 will abut the annular surface 18, which hence acts as a stop member for the further ,v~ t of the member 8 (cf. the figures lB and 2B).
Figure 3A shows a second embodiment of an a~ala~ux D' according to the invention comprising a housing 1 ' with a first part 2, a second part 19 and a third part 2', wherein the first part 2 constitutes a first male member Wo 95~18323 1 79 ~ 2 9 PCT/SE94/01250 forming a first throughgoing channel 5, the third part 2 ' constitutes a second male member forming a second throughgoing channel 5 ' and the second part 19 consti-tutes a transparent sleeve with two free ends l9a, l9b 5 and forms a double female member. The both male members 2, 2' and the sleeve 19 define a central chamber 7', wherein the first male member 2 and the second male member 2 ' form a first seating 14 and a second seatiny 14 ', respectively, in the central chamber 7 ' . The first 10 male member 2 as well as a first portion l9c of the sleeve, is formed with a righthand thread 4a, 4b, where-as the other male member 2 ' as well as a second portion of the sleeve l9d is formed with a lefthand thread 4a ', 4b ' . The sleeve 19 can hereby be taken away from the 15 male member 2, 2 ' without need for twisting tubes or pipes connected to the male members 2, 2 ', since the male members 2, 2 ' only perform a pure translational ,v~ ~ during rotatlon of the sleeve 19.
20 A member 8 of the same kind as has been described in connection with the first ~mho~l 1 according to figures lA-2C is intended to be arranged in the chamber 7 ' 25 The first as well as the second male member's seating 14 and 14 ', respectively, is provided with a connection piece S and S ', respectively. Between the respective connection piece S and S ' and the chamber ' s 7 circum-ferential wall an annular interspace 17 and 17 ', respec-30 tively, is formed, in which the shorter, first axialprotrusion 12 with less radial extension a has access ( see figure 3A~ . However, the second axial protrusion 13 with larger radial extension b does not fit in the W095/18323 ~94~,9 PCTISE94/01250 annular interspace 17 and 17 ' 7 respectlvely ( see f igure 3B ) .
It is possible to exchange the member 8 by a symmetrical 5 member, which is provided with similar axial protrusions 12, 12'; 13, 13' in both axial directions, i.e. all axial protrusions have either~ a less radial extension a (see figure lD and the member 8' in figure 3C) or a larger radial e~tension b ( see figure lD and the member 10 8 " in figure 3D ) .
Figure 4 shows a milking equipment 20 comprising a first, a second, a third and a fourth teatcup 21a-d with shell 22a-d and liner 23a-d, wherein four pulsation 15 spacas formed between the shells and the liners (not shown) are connected by means of four tubings 24a-d to a claw piece 25. The first and the second teatcup 21a, b are both connected to a iirst inner partial space 25a of the claw piece 25 while the third and the fourth teatcup 20 21c, d are connected to a second inner partial space 25b. ~he first and the second partial spaces 25a, b are connected via tubings 26a, b, respectively, to a pulsa-tor 27, which in turn is connected to a vacuum pump 28.
25 In the respective tubing 26a, b between the claw piece 25 and the pulsator 27 an c~a.al us D or D' according to the invention is provided, wherein the first through-going channel 5 is connected closest to the pulsator and the second throughgoing channel 6, 5 ' is connected 30 closest to the claw piece 25. The central passage 10 of the member 8, 8 ', 8 " in each apparatus D, D ' has a smaller area than the throughflow area of each tubing 26a, b.
~WOgS/18323 1 79~2~ 13 PCT/SE94/012~0 With the milking e~luipment 20 in operation the vacuum pump 28 generates a vacuum in the pulsator 27. The pulsator is adapted to cyclicly f irst connect the pulsation spaces of the first and the second teatcups 5 21a, b to vacuum while the pulsation spaces of the third and fourth teatcups 21c, d are connected to the atmos-phere. Thereafter, the pulsator shifts such that the pulsation spaces of the thir~ and the fourth teatcups 21c, d are connected to vacuum, while the pulsation 10 spaces of the first and second teatcups 21a, b are connected to the a -, h~e The cyclic pressure variation which hereby arises in each pulsation space, is illustrated in the figures 15 5A-5C, where the phase a shows the y~lelclL~:d pressure drop from the a i ~sph~ic pressure alternatively the overpressure Pl to the underpressure P2, when the liner is opened, the phase b shows the desired applied under-pressure P2, when the liner is open, the phase c shows 20 the increase of pressure from the underpressure P2 to the atmospheric pressure alternatively the overpressure Pl, when the liner is closed, and the phase d shows the recovery period of the teat when the liner is closed, before the cycle is repeated.
As mentioned above, it is sometimes desirable to change this pulsation curve especially such that the a- and/or the c-phase gets slower. As a consequence of this the liner will move slower during opening and closing of the 30 interior of the liner. Prolonged a-phase, i . e . slower opening of the interior of the liner, results in that the teat manages better to expand radially and to keep its frictional grip with the liner, whereby the teatcup iS ~l~v~ d from r.l 1mhln~ upwards on the teat towards 35 the udder and causing throttling of the teat ' s milk 9~
conducting interior in the vicinity of the udder. Such a rl ~r:~n~ of the teatcup aggravates the milking and gives rise to an increased amount of rest milk. Prolonged c-phase, i.e. slower closing of the liner's interior 5 results in that the teat is treated more leniently by the liner .
According to the present invention an extended a-phase is achieved by means of the apparatus according to lO figures lA-lD or figure 3A, wherein the first through-going channel 5 is provided closest to the pulsator 27 and the other throughgoing channel 6, 5 ' is provided closest to the claw piece 25 . = When the pulsator 27 creates a vacuum in the chamber 7 the member 8 is sucked 15 against the first seating, i.e. against the connection piece S with the member's first axial protrusion 12 astraddling the connection piece S such that the plate 9 of the member 8 abuts the connection p$ece ( see f igure lA and 3A, respectively). Hereby, the first channel 5 20 , i ~-~tes with the chamber 7 substantially only via the member ' s 8 central passage 10 . As a consequence of this the a-phase will be prolonged as shown by means of the broken curve line in figure 5A; since it takes longer time to evacuate the pulsation spaces via the 25 central passages 10 than via a tubing 26a, b which lacks ~n apparatus D, D ' according to the invention.
During the b-phase, when the pulsation space in the teatcup is evacuated, the pressure in the chamber 7 is 30 substantially constant. When the pulsator 27 causes atmospheric pressure alternatively overpressure in the chamber 7, the member 8 is sucked alternatively pushed towards the other seating 15, 14 ', where the other channel 6, 5 ' communicates with the chamber 7 via the 35 member ' s 8 central as well as its peripheral passages WO 95/18323 21 7 9 ~l 2 9 PCT/SE94~01250 10, 16a-d. Hereby, the pulsation curve keeps its normal character in the c-phase (see figure 5A).
In some cases it may be desirable to achieve a normal a-phase and a prolonged c-phase ( see the broken curve line in the pulsation curve in figure 5B ) . This is achieved by turning the apparatus according to figure lA-lD or figure 3A in the tubing 26a, 26b, respectively, so that the second throughgoing channel 6, 5 ' is closest to the pulsator 27 and the first throughgoing channel 5 is closest to the claw piece 25. Hereby, it takes a longer time to fill the pulsation spaces, since the air can only pass through the member's 8 central passage 10 during the c-phase.
Alternatively, the apparatus D ' accordlng to the second embodiment is used with the member 8 turned according to figure 3B. Then the first channel 5 communicates with the chamber 7 ' via the member ' s 8 central and peripheral passages 10, 16a-d, while the second channel 5 ' communi-cates with the chamber 7 ' only through the member ' s 8 central passage 10.
If both the a- and the c-phase is to be prolonged as shown with broken curve lines in figure 5C, an apparatus D ' according to the second embodiment is usQd with the modified member 8 ' according to figure 3C. Hereby the first and the second throughgoing channel 5, 5 ', respec-tively, communicates with the chamber 7 ' only via the member's 8 central passage lO, when the pulsation space is evacuated and f illed with air, respectively .
Alternatively, two opposedly directed apparatuses D
according to the first embodiment as shown in figure Wo 95/18323 PCTISE94/012~0 ~94~9 16 2~
lA-lD is used in each tubing 26a, 26b, whereby the same result is achieved ( prolonged a-phase and c-phase ) .
If an l~nrhAn~r tl pulsation curve is desired (which may be 5 suitable during milking of certain, hardy cows ), as shown by means of a continuous curve line in the figures 5A-C, the most simple measure is to take away the member 8 from the chamber 7, 7' but then the EQe~lhtlity dis-appears to indicate the pulsation. For this reason an lO apparatus according to the first embodiment is used in this case with turned member 8, as shown in figure 2A-2B . Alternatively an apparatus D ' according to the second embodiment with the rttflP~ member 8" shown in figure 3D is used. From this follows that the first and 15 the second throughgoing channel 5, 5 ', respectively, trAteS with the chamber 7, 7' through the members' 8, 8" central as well as peripheral passages 10, 16a-d, respectively, when the pulsation space is evacuated and filled with air, respectively, whereby the apparatus D
20 indicates the pulsation without causing more than an insignificant pressure drop in the tubing 26a, b.
The present invention is of course not limited to be used in milking eq~l;, L~. Accordingly, it may also be 25 used for other purposes, such as r.ll~ntn~ of pipes in general with a suitable liquid or a gas, which could be abrasive. In this case, the ~L,aL~Lus according to the invention is utilized to change the abrasive effect of the fluid, such that the flow is rendered slower or 30 faster in different flow directions.
Claims (19)
1. Apparatus (D, D') comprising a housing (1, 1') forming a channel ( 5, 6, 7; 5, 5', 7') for a reciprocating fluid, and a member (8) arranged in the channel and adapted to accomplish a first throughflow area in a first position (figs. 1A, 3A, 3C) for said fluid in the channel and to accomplish a second throughflow area in a second position ( fig. 1B, 2B) for said fluid in the channel, characterized in that the member (8) is adjustable such that it accomplishes a third throughflow area (figs. 2A, 3B), which is different from the first throughflow area when the member ( 8 ) is in the first position.
2. Apparatus according to claim 1, characterized in that said member (8) is movable along the channel (7,7') between the first and the second position.
3. Apparatus (D, D') comprising a housing (1,1') forming a channel (5,6,7; 5,5'7') for a reciprocating fluid and a member (8,8' ) arranged freely movable in the channel between a first and a second position in the channel, without stopping the fluid flow, characterized in that the member ( 8, 8' ) is adapted to change the throughflow area in the channel when the member is at least in the first position ( figs. 1A, 3A, 3C).
4. Apparatus (D') according to claim 3, characterized in that the member (8') is adapted to change the throughflow area in the channel (5,5',7') when the member is in the first as well as in the second position (fig. 3C).
5. Apparatus according to claim 4, characterized in that in the channel ( 7' ) there is provided a first seating (14) and a second seating (14') respectively, against which said member (8') abuts when it takes said first position and second position, respectively, that a first throughflow area in the channel is formed by at least one passage (10) in the member, when the member abuts the first seating and that a second throughflow area in the channel is formed by said passage, when the member abuts the second seating.
6. Apparatus according to claim 3, characterized in that the member (8) is adapted to accomplish a first throughflow area in the channel in the first position and to accomplish a second throughflow area in the channel in the second position.
7. Apparatus according to claim 6, characterized in that the member (8) is adjustable such that it accomp-lishes a third throughflow area (fig. 2A, 3B), which is different from the first throughflow area when the member (8) is in the first position.
8. Apparatus according to any one of claims 1-2 or 7, characterized in that the housing (1,1') comprises at least two parts (2,3; 2,2',19) which are disengageably connected to each other in such a way that said member (8) is accessible for said adjustment for accomplishment of the third throughflow area when said parts of the housing are released from each other.
9. Apparatus according to any one of claims 1-2 or 6-8, characterized in that the first throughflow area is smaller than the second throughflow area.
10. Apparatus according to any one of claims 1-2 or 7-9, characterized in that the third throughflow area is larger than the first throughflow area.
11. Apparatus according to any one of claims 1-2 or 7-10, characterized in that the third throughflow area is substantially of the same size as the second through-flow area.
12. Apparatus according to any one of claims 1-2 or 6-11, characterized in that in the channel (5-7;
5,5',7') there is provided a first seating (14) against which said member (8) abuts when it takes said first position and a second seating (15; 14'), against which the member ( 8 ) abuts when it takes said second position.
5,5',7') there is provided a first seating (14) against which said member (8) abuts when it takes said first position and a second seating (15; 14'), against which the member ( 8 ) abuts when it takes said second position.
13. Apparatus according to claim 12, characterized in that the member is formed with at least one substan-tially central passage (10) and at least one peripheral passage (16a-d).
14. Apparatus according to claim 13, characterized in that that the first throughflow area is formed by the central passage (10) of the member ( 8 ) when the member abuts the first seating (14) and the second throughflow area is formed by the central passage (10) and peripheral passages (16a-d) of the member, when the member (8) abuts the second seating (15; 14'), and that when the member is in its first position and is adjusted to accomplish said third throughflow area this is formed by the member's central (10) and peripheral passages (16a-d).
15. Apparatus according to claim 14, characterized in that the member (8) is guided in such a way by the housing (1,1') that a first side of the member is closest to the first seating (14), while a second, opposite side of the member ( 8 ) is closest to the second seating (15; 14'), and that for accomplishment of the third throughflow area, the member (8) is turnable when said parts (2, 3; 2, 2', 19) of the housing (1) are disconnected from each other, whereby said first side of the member is closest to the second seating (15; 14') while said second side of the member (8) is closest to the first seating (14) when the member ( 8 ) is turned.
16. Apparatus according to anyone of the preceding claims, characterized by means ( 3b, 19 ) adapted to indicate the movement of the member.
17. Apparatus according to claim 16, characterized in that said means (3b,19) comprises a transparent portion of the housing (1,1'), whereby the movement of the member ( 8, 8', 8") is visually indicatable.
18. Apparatus (D') consisting of a set of parts and comprising a disconnectible housing (1'), which forms a channel ( 5, 7', 5' ) for a fluid; three interchangeable members ( 8, 8', 8" ), which are each movable in the channel between a first and a second position (14,14'); and means adapted to indicate the movement of each member (8, 8', 8"); wherein a first member (8) of said three members is adapted to accomplish a first throughflow area in said first position (14), and to accomplish a second throughflow area in said second position (14'), wherein the first throughflow area is different from the second throughflow area (fig. 3A);
a second member (8') of said three members is adapted to accomplish a reduced first throughflow area in the channel in said first position (14) and to accomplish a reduced second throughflow area in the channel in said second positon (14'), wherein the first throughflow area is substantially as large as the second throughflow area (fig. 3C); and wherein a third member (8") of said three members is adapted to accomplish a substantially unreduced first throughflow area in the channel in said first position (14) and to accomplish a substantially unreduced second throughflow area in the channel in said second position (14') where-in the first throughflow area is substantially as large as the second throughflow area (fig. 3D).
a second member (8') of said three members is adapted to accomplish a reduced first throughflow area in the channel in said first position (14) and to accomplish a reduced second throughflow area in the channel in said second positon (14'), wherein the first throughflow area is substantially as large as the second throughflow area (fig. 3C); and wherein a third member (8") of said three members is adapted to accomplish a substantially unreduced first throughflow area in the channel in said first position (14) and to accomplish a substantially unreduced second throughflow area in the channel in said second position (14') where-in the first throughflow area is substantially as large as the second throughflow area (fig. 3D).
19. Milking equipment (20) comprising a pulsator (27) intended to be connected to a pneumatic source (28), and at least one teatcup (21a-d) consisting of a shell (22a-d) and a liner (23a-d), wherein a pulsation space is formed between the shell and the liner, characterized in that the pulsator (27) is adapted to communicate with said pulsation space via an apparatus (D, D') according to any one of the preceding claims.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9304335A SE9304335D0 (en) | 1993-12-30 | 1993-12-30 | valve device |
| SE9304335-4 | 1993-12-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2179429A1 true CA2179429A1 (en) | 1995-07-06 |
Family
ID=20392258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2179429 Abandoned CA2179429A1 (en) | 1993-12-30 | 1994-12-23 | Valve device |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0737284A1 (en) |
| AU (1) | AU1428995A (en) |
| CA (1) | CA2179429A1 (en) |
| SE (1) | SE9304335D0 (en) |
| WO (1) | WO1995018323A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7975647B2 (en) | 2007-09-22 | 2011-07-12 | Lauren Agrisystems, Ltd. | Flow restrictor for milking apparatus |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US631036A (en) * | 1899-02-04 | 1899-08-15 | George M Crump | Reversible check-valve. |
| US3138177A (en) * | 1961-09-06 | 1964-06-23 | Gen Electric | Flow control device |
| CH508144A (en) * | 1969-04-25 | 1971-05-31 | Ingbuero Roshard | Nozzle for two opposite flow directions with different flow cross-sections and their use |
| SE9100242D0 (en) * | 1991-01-25 | 1991-01-25 | Alfa Laval Agri Int | SAY TO MILK |
| DK102996A (en) * | 1996-03-25 | 1996-09-20 | Schur Consumer Prod | Process for making freezer mold bags |
-
1993
- 1993-12-30 SE SE9304335A patent/SE9304335D0/en unknown
-
1994
- 1994-12-23 EP EP95905828A patent/EP0737284A1/en not_active Withdrawn
- 1994-12-23 WO PCT/SE1994/001250 patent/WO1995018323A1/en not_active Application Discontinuation
- 1994-12-23 CA CA 2179429 patent/CA2179429A1/en not_active Abandoned
- 1994-12-23 AU AU14289/95A patent/AU1428995A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EP0737284A1 (en) | 1996-10-16 |
| WO1995018323A1 (en) | 1995-07-06 |
| SE9304335D0 (en) | 1993-12-30 |
| AU1428995A (en) | 1995-07-17 |
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| Date | Code | Title | Description |
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