GB1592318A - Fluid flow control valves - Google Patents

Fluid flow control valves Download PDF

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Publication number
GB1592318A
GB1592318A GB40796/77A GB4079677A GB1592318A GB 1592318 A GB1592318 A GB 1592318A GB 40796/77 A GB40796/77 A GB 40796/77A GB 4079677 A GB4079677 A GB 4079677A GB 1592318 A GB1592318 A GB 1592318A
Authority
GB
United Kingdom
Prior art keywords
valve
gasket
shaft
length
gaskets
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.)
Expired
Application number
GB40796/77A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
YARDEN MEDICAL ENG Ltd
Original Assignee
YARDEN MEDICAL ENG Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by YARDEN MEDICAL ENG Ltd filed Critical YARDEN MEDICAL ENG Ltd
Publication of GB1592318A publication Critical patent/GB1592318A/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • F16K1/38—Valve members of conical shape
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
    • A61M5/16877—Adjusting flow; Devices for setting a flow rate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K41/00—Spindle sealings
    • F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
    • F16K41/04—Spindle sealings with stuffing-box ; Sealing rings with at least one ring of rubber or like material between spindle and housing

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Hematology (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Anesthesiology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Vascular Medicine (AREA)
  • Fluid Mechanics (AREA)
  • Lift Valve (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Description

(54) IMPROVEMENTS IN OR RELATING TO FLUID FLOW CONTROL VALVES (71) We, YARDEN MEDICAL ENGIN EERING LIM1TED, a limited liability company organised and existing under the laws of the State of Israel, of 49 Ruth Street, P.O. Box 7102, Haifa, Israel, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to fluid flow control valves, particularly though not exclusively to needle valves, for infusion apparatus.
With medical apparatus, in particular apparatus for intravenous infusion, it is extremely important that the solution introduced into a patient's vein,remains sterile.
With apparatus for intravenous infusion, but also with other medical apparatus, metering devices are used to supply the solution concerned in the quantity required. Such devices include a valve for metering the flow rate, operated and controlled by movement of a valve member extending from the exterior of a valve housing into the interior of the housing. Circular gaskets have been used for sealing the valve member within the valve housing. Such circular gaskets prevent liquid flowing through the valve from leaking along the valve member and prevent contaminants from entering the liquid along the valve shaft.
However it has been observed in practice that such known circular gaskets do not form an effective barrier against bacteria. According to the invention there is provided a fluid flow control valve comprising a valve body having an elongate cylindrical bore and an axially aligned valve seat, an elongate valve member disposed within said bore for axial movement therein and having a tapering head operalvely cooperating with the valve seat whereby to vary the valve opening in dependence on the axial position of the valve member, said bore having a thread formed therein and said valve member having a cooperating threaded part engaged therewith and a thumb wheel rotation of which effects axial movement of the valve member by means of said cooperating threads, and annular gasket means disposed between the bore wall and the valve member, the overall axial length of the gasket means being greater than the amount of axial movement of the valve member between its end stop positions.
Whilst in the prior art bacteria attached to an area of the valve member may with a given adjustment of the valve be outside the gasket means the bacteria may penetrate through the gasket with movement of the valve member.
Bacteria penetrating within the gasket may contaminate the fluid flowing through the valve.
The present invention on the other hand prevents penetration of bacteria by providing gasket means having an overall axial length greater than the amount of movement of the valve member so that bacteria attached to one part of the valve member cannot penetrate through the gasket means.
In addition leakage of fluids from the valve is prevented; this is particularly important with radioactive solutions.
The gasket means may consist of a single piece or of a plurality of axially spaced gaskets.
The gasket means may be mounted on the cylindrical bore wall or the valve shaft and, in addition to the gasket means, there may be provided an anti-bacterial barrier on the inside or outside of the gasket means and positioned on the valve shaft or on the cylindrical bore wall.
Preferred embodiments of the invention will now be described with reference to the accompanying drawings: Figure 1 is a cross-sectional view of a first embodiment of the invention; and Figure 2 is a cross-sectional view of a second embodiment of the invention.
Referring to Figure 1 the first embodiment of the invention shows a casing 10 having a valve member comprising a valve shaft 12 movable along its longitudinal axis 42 between limit stops a predetermined distance E.
In casing 10 a valve seat 14 is formed which cooperates with a needle shaped end 16 of the valve shaft 12 in order to open or close an inlet channel 18.
The needle end 16 has the shape of a cone, so that the size of the flow section of inletchannel 18 may be adjusted.
The valve is shown as being completely closed. Liquid flows through the valve from inlet channel 18 to outlet channel 20; an inverse flow direction is possible as well.
The valve shaft 12 has a cylindrical shaft 22 and a thread 24, the diameter of the latter being larger than that of the shaft 22 and which is threaded in an interior thread 38 of the case 10.
The shaft 12 has a cylindrical section 44, which has a smaller diameter than that of thread 24 and which leads to a thumb wheel 26, that is positioned outside of case 10 and has a sufficiently large diameter in order to be manipulated and to set the valve shaft 12.
As shown, on shank 22 of valve shaft 12 there are two gaskets 28 and 32 spaced axially from each other, the overall axial length of which is designated as L. The gaskets slide together along the wall 46 of the cylindrical bore in which the valve shaft is mounted. Figure 1 shows a position of the valve shaft by which valve seat 14 is closed and thus the valve seat 14 provides a limit stop for movement of the shaft 12. Another limit stop of the valve is provided by limit stop 40 at the opening of the bore. Limit stop 40 comprises a member threaded on thread 38.
From the position shown the valve shaft may be moved by rotating thumb wheel 26 in the appropriate direction.
In order to prevent in the course of axial motion of the valve shaft in relation to the housing penetration of microbes from the exterior to the interior the distance L between gaskets 28 and 32 is larger than the predetermined distance E of the valve shaft.
It will be observed that the axial length of the cylindrical interior wall 46 of the housing is sufficiently long to accomodate motion of the shaft without the gaskets reaching the edge of 46.
As length L is larger than the distance E areas of the housing which in one end position shown are to one side of gasket 48 remain to the same side of gasket 50 so that micro organisms on these areas of the housing cannot penetrate to the interior of the valve for example, into the outlet channel 20.
Instead of two circular gaskets 28 and 32, a greater number of circular gaskets may be used too, provided that the length L, reaching from the interior face 50 of the interior gasket 28 to the exterior face 48 of the exterior gasket 32, is larger than length E.
Preferably length L is about 3-5mm larger than the length E. The circular gaskets may also be mounted in wall 46 so that they do not move with the valve shaft.
Figure 2 shows a second embodiment of the invention, for which instead of several circular gaskets there is used but one elongate gasket 34, the length L of which is again larger than the predetermined amount of movement of the valve shaft. Gasket 34 is mounted in the wall of the cylindrical bore of the housing.
Gasket 34 remains in contact with the wall of the bore throughout the axial movement of the valve shaft 12.
It is thereby avoided, that, for example, an area 52 of the shank 22 of the valve shaft, which in the end position shown lies axially outside the face 48 of the gasket, will lie in the other end position (not shown) within the face 50 of the gasket. Therefore, it is not possible that microbes, that, for example, stick to the area 52 of the shank are transported by the setting motion of the valve shaft into the interior of the valve and possibly cause contamination.
The arrangement shown in Figure 1 and 2 also prevent liquid flowing from the valve via the gasket according to the invention since areas of the case or the valve shaft lying in the one end position of the valve within the face 50 of the gasket cannot in the other end posi tion be outside the face 48, and this is of im portance when radioactive liquids are used.
Additional security may be gained by using an anti-bacterial barrier 36, which is positioned within the gasket. The anti-bacterial barrier 36 is shown as mounted on the valve shaft 12 but it may be mounted on the case 10. Further, such an anti-bacterial may be positioned out side of the gasket, i.e. axially outside of the face 48.
These ring-shaped barriers remove a great part of the liquid, if they are positioned on the inside, of gasket 34.
WHAT WE CLAIM IS: 1. A fluid flow control valve comprising a valve body having an elongate cylindrical bore and an axially aligned valve seat, an elongate valve member disposed with said bore for axial movement therein and having a tapering head operatively cooperating with the valve seat whereby to vary the valve opening in dependence on the axial position of the valve member, said bore having a thread formed therein and said valve member having a cooperating threaded part engaged therewith and a thumb wheel rotation of which effects axial movement of the valve member by means of said cooperating threads, and annular gasket means disposed between the bore wall and the valve member, the overall axial length of the gasket means being greater than the amount of axial movement of the valve member between its end stop portions.
2. A valve according to Claim 1 wherein the said amount of movement of the valve member is between 3mm and 5mm greater than the length of the said gasket means.
3. A valve according to Claim 1 or 2 wherein said gasket means is formed in one place.
4. A valve according to Claim 1 or 2 wherein the gasket means comprises a plurality of separate annular gaskets axially spaced from one another.
5. A valve as claimed in any preceding claim wherein the gasket means is attached to the wall of the cylindrical bore.
6. A valve as claimed in any of Claims 1 to 4 wherein the gasket means is attached to the valve member.
7. A valve as claimed in any preceding claim including an anti-bacterial barrier dis
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    being larger than that of the shaft 22 and which is threaded in an interior thread 38 of the case 10.
    The shaft 12 has a cylindrical section 44, which has a smaller diameter than that of thread 24 and which leads to a thumb wheel 26, that is positioned outside of case 10 and has a sufficiently large diameter in order to be manipulated and to set the valve shaft 12.
    As shown, on shank 22 of valve shaft 12 there are two gaskets 28 and 32 spaced axially from each other, the overall axial length of which is designated as L. The gaskets slide together along the wall 46 of the cylindrical bore in which the valve shaft is mounted. Figure 1 shows a position of the valve shaft by which valve seat 14 is closed and thus the valve seat
    14 provides a limit stop for movement of the shaft 12. Another limit stop of the valve is provided by limit stop 40 at the opening of the bore. Limit stop 40 comprises a member threaded on thread 38.
    From the position shown the valve shaft may be moved by rotating thumb wheel 26 in the appropriate direction.
    In order to prevent in the course of axial motion of the valve shaft in relation to the housing penetration of microbes from the exterior to the interior the distance L between gaskets 28 and 32 is larger than the predetermined distance E of the valve shaft.
    It will be observed that the axial length of the cylindrical interior wall 46 of the housing is sufficiently long to accomodate motion of the shaft without the gaskets reaching the edge of 46.
    As length L is larger than the distance E areas of the housing which in one end position shown are to one side of gasket 48 remain to the same side of gasket 50 so that micro organisms on these areas of the housing cannot penetrate to the interior of the valve for example, into the outlet channel 20.
    Instead of two circular gaskets 28 and 32, a greater number of circular gaskets may be used too, provided that the length L, reaching from the interior face 50 of the interior gasket 28 to the exterior face 48 of the exterior gasket 32, is larger than length E.
    Preferably length L is about 3-5mm larger than the length E. The circular gaskets may also be mounted in wall 46 so that they do not move with the valve shaft.
    Figure 2 shows a second embodiment of the invention, for which instead of several circular gaskets there is used but one elongate gasket 34, the length L of which is again larger than the predetermined amount of movement of the valve shaft. Gasket 34 is mounted in the wall of the cylindrical bore of the housing.
    Gasket 34 remains in contact with the wall of the bore throughout the axial movement of the valve shaft 12.
    It is thereby avoided, that, for example, an area 52 of the shank 22 of the valve shaft, which in the end position shown lies axially outside the face 48 of the gasket, will lie in the other end position (not shown) within the face 50 of the gasket. Therefore, it is not possible that microbes, that, for example, stick to the area
    52 of the shank are transported by the setting motion of the valve shaft into the interior of the valve and possibly cause contamination.
    The arrangement shown in Figure 1 and 2 also prevent liquid flowing from the valve via the gasket according to the invention since areas of the case or the valve shaft lying in the one end position of the valve within the face
    50 of the gasket cannot in the other end posi tion be outside the face 48, and this is of im portance when radioactive liquids are used.
    Additional security may be gained by using an anti-bacterial barrier 36, which is positioned within the gasket. The anti-bacterial barrier 36 is shown as mounted on the valve shaft 12 but it may be mounted on the case 10. Further, such an anti-bacterial may be positioned out side of the gasket, i.e. axially outside of the face 48.
    These ring-shaped barriers remove a great part of the liquid, if they are positioned on the inside, of gasket 34.
    WHAT WE CLAIM IS: 1. A fluid flow control valve comprising a valve body having an elongate cylindrical bore and an axially aligned valve seat, an elongate valve member disposed with said bore for axial movement therein and having a tapering head operatively cooperating with the valve seat whereby to vary the valve opening in dependence on the axial position of the valve member, said bore having a thread formed therein and said valve member having a cooperating threaded part engaged therewith and a thumb wheel rotation of which effects axial movement of the valve member by means of said cooperating threads, and annular gasket means disposed between the bore wall and the valve member, the overall axial length of the gasket means being greater than the amount of axial movement of the valve member between its end stop portions.
  2. 2. A valve according to Claim 1 wherein the said amount of movement of the valve member is between 3mm and 5mm greater than the length of the said gasket means.
  3. 3. A valve according to Claim 1 or 2 wherein said gasket means is formed in one place.
  4. 4. A valve according to Claim 1 or 2 wherein the gasket means comprises a plurality of separate annular gaskets axially spaced from one another.
  5. 5. A valve as claimed in any preceding claim wherein the gasket means is attached to the wall of the cylindrical bore.
  6. 6. A valve as claimed in any of Claims 1 to 4 wherein the gasket means is attached to the valve member.
  7. 7. A valve as claimed in any preceding claim including an anti-bacterial barrier dis
    posed between the valve member and the cylindrical bore.
  8. 8. A fluid control valve substantially as hereinbefore described with reference to the accompanying drawings.
GB40796/77A 1976-09-30 1977-09-30 Fluid flow control valves Expired GB1592318A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762644141 DE2644141A1 (en) 1976-09-30 1976-09-30 VALVE

Publications (1)

Publication Number Publication Date
GB1592318A true GB1592318A (en) 1981-07-08

Family

ID=5989312

Family Applications (1)

Application Number Title Priority Date Filing Date
GB40796/77A Expired GB1592318A (en) 1976-09-30 1977-09-30 Fluid flow control valves

Country Status (10)

Country Link
BE (1) BE859214A (en)
DE (1) DE2644141A1 (en)
DK (1) DK431877A (en)
ES (1) ES462751A1 (en)
FR (1) FR2366504A1 (en)
GB (1) GB1592318A (en)
IT (1) IT1090157B (en)
LU (1) LU78190A1 (en)
NL (1) NL7710648A (en)
SE (1) SE7710995L (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176265A (en) * 1985-06-10 1986-12-17 Graco Inc Flow control device
DE9202519U1 (en) 1992-02-27 1992-05-14 Lanny, Michael, 7547 Wildbad Valve

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2038157T3 (en) * 1986-12-15 1993-07-16 Pvb Medizintechnik Gmbh DOSING DEVICE FOR ADJUSTING THE FLOW REGIME OF A LIQUID CURRENT CONDUCTED WITHIN A VALVE BOX IN A CURRENT CHANNEL ENTERING OR LEAVING THE BODY OF A LIVING BEING.
CA2121067C (en) * 1993-09-27 1997-11-11 William E. Hoehn Valve assembly structure for a fluid stream

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1349536A (en) * 1963-01-17 1964-01-17 Cavagna Paolo Soc Di Fatto Tap valve for liquefied gas containers fitted with automatic piston shut-off devices in the event of accidental bending or breaking during opening and closing operations
FR2125719A5 (en) * 1971-02-18 1972-09-29 Onec

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176265A (en) * 1985-06-10 1986-12-17 Graco Inc Flow control device
DE9202519U1 (en) 1992-02-27 1992-05-14 Lanny, Michael, 7547 Wildbad Valve

Also Published As

Publication number Publication date
IT1090157B (en) 1985-06-18
BE859214A (en) 1978-03-29
DK431877A (en) 1978-03-31
LU78190A1 (en) 1978-11-03
ES462751A1 (en) 1978-05-16
NL7710648A (en) 1978-04-03
DE2644141A1 (en) 1978-04-06
FR2366504A1 (en) 1978-04-28
SE7710995L (en) 1978-03-31

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee