WO1992018219A1 - Filter apparatus for cleaning oil - Google Patents

Filter apparatus for cleaning oil Download PDF

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Publication number
WO1992018219A1
WO1992018219A1 PCT/SE1991/000266 SE9100266W WO9218219A1 WO 1992018219 A1 WO1992018219 A1 WO 1992018219A1 SE 9100266 W SE9100266 W SE 9100266W WO 9218219 A1 WO9218219 A1 WO 9218219A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
core
oil
roll
pressure side
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.)
Ceased
Application number
PCT/SE1991/000266
Other languages
French (fr)
Inventor
Aegir BJÖRNSSON
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to ES91910314T priority Critical patent/ES2084166T3/en
Priority to US08/133,158 priority patent/US5484523A/en
Priority to EP91910314A priority patent/EP0594614B1/en
Priority to DE69116386T priority patent/DE69116386T2/en
Priority to DK91910314.3T priority patent/DK0594614T3/en
Priority to AT91910314T priority patent/ATE132765T1/en
Priority to JP50961591A priority patent/JP3161727B2/en
Priority to PCT/SE1991/000266 priority patent/WO1992018219A1/en
Publication of WO1992018219A1 publication Critical patent/WO1992018219A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
    • B01D35/147—Bypass or safety valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/05—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements supported
    • B01D29/07—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements supported with corrugated, folded or wound filtering sheets
    • B01D29/072—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements supported with corrugated, folded or wound filtering sheets ring shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
    • B01D29/216—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets with wound sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/90—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding
    • B01D29/902—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding containing fixed liquid displacement elements or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/92—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging filtrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/30—Filter housing constructions
    • B01D2201/307—Filtering elements contained in an insert body mounted in a filter housing (double casing), e.g. to avoid contamination when removing or replacing the filter element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/44—Special measures allowing the even or uniform distribution of fluid along the length of a conduit

Definitions

  • the present invention concerns an arrangement for a filter for the purification of oil, for example combustion oil, lubricating oil, hydraulic oil or transformer oil from liquid and particulate impurities which are in suspension, said filter being formed of a filter paper, wound into a roll around a stiff core of a liquid-impermeable material, and a housing, surrounding the filter unit, of liquid-impermeable material which is arranged to guide the liquid flow essentially axially through the filter, roll from a high pressure side to a low pressure side.
  • oil for example combustion oil, lubricating oil, hydraulic oil or transformer oil from liquid and particulate impurities which are in suspension
  • said filter being formed of a filter paper, wound into a roll around a stiff core of a liquid-impermeable material, and a housing, surrounding the filter unit, of liquid-impermeable material which is arranged to guide the liquid flow essentially axially through the filter, roll from a high pressure side to a low pressure side.
  • GB 796,475 describes an oil filter which for a long time formed the market standard in the category of lubrication filters.
  • the development in combustion engines has, at least for private cars and trucks, gone in a direction towards engines with higher performance and higher operating temperatures.
  • the requirements on the lubrication oil's quality and the system for purification of the same have also increased accordingly.
  • the high quality oil contains many chemical additives which make it expensive to produce and at the same time imply a load on the environment. Used lubrication oil is often destroyed by burning in plants having poor or no cleaning. The normal reason necessitating the change of lubrication oil is that the oil is saturated with fine particles which the engine's filter system is incapable of collecting.
  • Another field of use for oil is as insulating fluid in transformers. Due to the occurrence of particles and moisture in the oil, arcing can occur in the fluid. The insulating fluid therefore has to be changed or filtered clean at regular intervals.
  • SE 450650 describes an arrangement for filtering of combustion oil for diesel engines.
  • the arrangement accomplishes an effective separation of particles and water droplets from the combustion oil but, due to the large flow resistance, this arrangement has a limited field of application.
  • An object of the present invention is therefore to achieve a filter arrangement which is more adaptable to different conditions of use than known filter arrangements. Another object is to achieve a highly effective filter arrangement for a broad spectrum of applications.
  • the core is provided with an internal plug proximate the low pressure side of the filter roll, in that the core presents a number of radial passages between the core interior and the filter roll, and in that the core moreover is provided with at least one openable valve, with the help of which the interior of the core can be put in flow-connection with the filter roll's low pressure side.
  • Fig.l schematically shows a vertical section of a filter arrangement according to a first embodiment of the invention
  • Fig.2 shows a variation of the filter arrangement depicted in
  • Both figures show a filter arrangement comprising a central filter insert 10, which presents a core 11 of oil-resistant material, around which cellulose paper is tightly wound into a roll 12.
  • This roll is pressed into a filter holder bowl 13 which fits tightly against the roll's enveloping surface, but leaves free play at one end of the roll, which in the figure is the lower end. The other end of the roll is totally open.
  • the filter insert 10 is mounted inside a filter housing 14.
  • the casing 14 comprises a cover 15, which is screwably tightenable by means of screws 16 in a cylindrical part.
  • the core 11 of the filter insert 10 is screwed onto a centrally positioned sleeve 18 provided with external threads 17 and projecting from the inside of the cover 15.
  • the opposite end of the insert 10 is supported by means of an end plug 19, a compression spring 20 and additionally a central opening in the filter holder bowl 13 against a pipe socket 21 directed towards the interior of the container.
  • This pipe socket 21 connected tightly against the filter holder bowl 13 forms an outlet from the filter housing 14.
  • the housing 14 is provided with two inlet pipes 22, which open onto the outside of the filter housing bowl 13.
  • a flow path is formed through the filter housing, which extends upwards in the figures, between the interior of the housing and the outside of the filter holder bowl to the filter housing cover.
  • the flow reverses downwards and passes through the roll 12.
  • the flow direction changes radially inwards and exits out of the filter housing via the central pipe socket 21.
  • the above described flow path forms a primary flow path through the filter, which is capable of removing all types of coarse grain and fine grain particles from the lubricating oil. Moreover this filter is capable of absorbing possible water droplets in the oil.
  • the primary flow path through the filter roll 12 presents a proportionately large resistance to flow.
  • the sleeve 18 is provided with internal passages 23, which are openable by means of adjusting device 25 operable via an electric cable 24.
  • This adjustment device can be arranged to keep the passages into the interior of the core 11 open, until the oil reaches a particular temperature, or alternatively to open the passages 23 in case the fluid pressure on the filter's pressure side reaches a particular value. In this way a secondary flow path is formed via the core interior and a number of holes 26 bored radially through the core wall.
  • Fig.l shows a variant of the invention where all the holes 26 are open to the roll 12.
  • This variant can be used to advantage for filtering lubrication oil, in which the secondary flow path with proportionately low resistance is open for cold starting since the oil is cold and the viscosity is therefore high.
  • FIG.2 shows a second variant of the invention where the core is divided axially by means of four valve plugs 27. Each of these valve plugs 27 is provided with an overflow valve 28 which is arranged to open at a particular fluid pressure.
  • the filter housing can be shaped differently than shown.
  • the flow paths can be reversed from those described above.
  • the device for opening and closing of the secondary flow paths can be different than shown.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Filtration Of Liquid (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Detergent Compositions (AREA)
  • Fats And Perfumes (AREA)

Abstract

An arrangement for a filter for purification of oil, for example combustion oil, lubricating oil, hydraulic oil or transformer oil, from liquid and particulate impurities which are in suspension, said filter (10) being formed of a filter paper, wound into a roll (12) around a stiff core (11) of a liquid-impermeable material. Further the filter unit is provided with a surrounding housing (13) of liquid-impermeable material which is arranged to guide the liquid flow essentially axially through the filter roll (12) from a high pressure side to a low pressure side. With a view to increasing the field of application the core (11) is provided with an internal plug (19) proximate the low pressure side of the filter roll. Moreover the core presents a number of radial passages (26) between the core interior and the filter roll (12). Further, the core (11) is provided with at least one openable valve (25; 27), with the help of which the interior of the core can be put in flow-connection with the filter roll's (12) low pressure side.

Description

TITLE
FILTER APPARATUS FOR CLEANING OIL
TECHNICAL FIELD
The present invention concerns an arrangement for a filter for the purification of oil, for example combustion oil, lubricating oil, hydraulic oil or transformer oil from liquid and particulate impurities which are in suspension, said filter being formed of a filter paper, wound into a roll around a stiff core of a liquid-impermeable material, and a housing, surrounding the filter unit, of liquid-impermeable material which is arranged to guide the liquid flow essentially axially through the filter, roll from a high pressure side to a low pressure side.
TECHNICAL BACKGROUND
GB 796,475 describes an oil filter which for a long time formed the market standard in the category of lubrication filters. The development in combustion engines has, at least for private cars and trucks, gone in a direction towards engines with higher performance and higher operating temperatures. The requirements on the lubrication oil's quality and the system for purification of the same have also increased accordingly. In many cases the problem is solved with the help of more frequent oil and filter changes. The high quality oil contains many chemical additives which make it expensive to produce and at the same time imply a load on the environment. Used lubrication oil is often destroyed by burning in plants having poor or no cleaning. The normal reason necessitating the change of lubrication oil is that the oil is saturated with fine particles which the engine's filter system is incapable of collecting.
The increased use of hydraulic oil for different systems and arrangements also brings with it a considerable load on the environment, for example when piston seals are damaged by particles in the oil, leading to leaks.
Another field of use for oil is as insulating fluid in transformers. Due to the occurrence of particles and moisture in the oil, arcing can occur in the fluid. The insulating fluid therefore has to be changed or filtered clean at regular intervals.
SE 450650 describes an arrangement for filtering of combustion oil for diesel engines. The arrangement accomplishes an effective separation of particles and water droplets from the combustion oil but, due to the large flow resistance, this arrangement has a limited field of application.
Present filter arrangements lack the flexibility required to be effective at differing oil temperatures, viscosities and degrees of impurity.
TECHNICAL PROBLEM
An object of the present invention is therefore to achieve a filter arrangement which is more adaptable to different conditions of use than known filter arrangements. Another object is to achieve a highly effective filter arrangement for a broad spectrum of applications.
SOLUTION
This object is achieved according to the invention, in that the core is provided with an internal plug proximate the low pressure side of the filter roll, in that the core presents a number of radial passages between the core interior and the filter roll, and in that the core moreover is provided with at least one openable valve, with the help of which the interior of the core can be put in flow-connection with the filter roll's low pressure side.
The subsequent dependent claims describe different advantageous variants of the arrangement. DESCRIPTION OF THE FIGURES
An embodiment of the invention will now be described in more detail with reference to the accompanying drawings, in which
Fig.l schematically shows a vertical section of a filter arrangement according to a first embodiment of the invention, and
Fig.2 shows a variation of the filter arrangement depicted in
Fig.l.
PREFERRED EMBODIMENTS
Both figures show a filter arrangement comprising a central filter insert 10, which presents a core 11 of oil-resistant material, around which cellulose paper is tightly wound into a roll 12. This roll is pressed into a filter holder bowl 13 which fits tightly against the roll's enveloping surface, but leaves free play at one end of the roll, which in the figure is the lower end. The other end of the roll is totally open.
The filter insert 10 is mounted inside a filter housing 14. The casing 14 comprises a cover 15, which is screwably tightenable by means of screws 16 in a cylindrical part. The core 11 of the filter insert 10 is screwed onto a centrally positioned sleeve 18 provided with external threads 17 and projecting from the inside of the cover 15. The opposite end of the insert 10 is supported by means of an end plug 19, a compression spring 20 and additionally a central opening in the filter holder bowl 13 against a pipe socket 21 directed towards the interior of the container. This pipe socket 21 connected tightly against the filter holder bowl 13 forms an outlet from the filter housing 14.
The housing 14 is provided with two inlet pipes 22, which open onto the outside of the filter housing bowl 13. Hereby a flow path is formed through the filter housing, which extends upwards in the figures, between the interior of the housing and the outside of the filter holder bowl to the filter housing cover. Here the flow reverses downwards and passes through the roll 12. At the bottom of the filter holder bowl 13 the flow direction changes radially inwards and exits out of the filter housing via the central pipe socket 21.
The above described flow path forms a primary flow path through the filter, which is capable of removing all types of coarse grain and fine grain particles from the lubricating oil. Moreover this filter is capable of absorbing possible water droplets in the oil. The primary flow path through the filter roll 12 presents a proportionately large resistance to flow.
The sleeve 18 is provided with internal passages 23, which are openable by means of adjusting device 25 operable via an electric cable 24. This adjustment device can be arranged to keep the passages into the interior of the core 11 open, until the oil reaches a particular temperature, or alternatively to open the passages 23 in case the fluid pressure on the filter's pressure side reaches a particular value. In this way a secondary flow path is formed via the core interior and a number of holes 26 bored radially through the core wall.
Fig.l shows a variant of the invention where all the holes 26 are open to the roll 12. This variant can be used to advantage for filtering lubrication oil, in which the secondary flow path with proportionately low resistance is open for cold starting since the oil is cold and the viscosity is therefore high.
Consequently the oil passes more easily and more quickly through the filter with a reduced degree of purification, until the temperature rises and the viscosity falls, whereby the passages 23 are closed to attain the full degree of purification. This variant is even applicable for purifying hydraulic or transformer oil, in which case one uses both the primary and the secondary flow paths in a first coarse purification stage. In the second stage the filter's maximum purification capacity is then used via the primary flow path only. Fig.2 shows a second variant of the invention where the core is divided axially by means of four valve plugs 27. Each of these valve plugs 27 is provided with an overflow valve 28 which is arranged to open at a particular fluid pressure. In this way one can thereby produce a stepwise increase or decrease of the number of open passages 26 in the core 11. This. allows an extraordinarily good utilisation of the filter roll's purification capacity, which for example is shown in that dirt particles will be relatively evenly spread in the roll's axial direction.
The invention is not limited to the above described embodiment, many variations being imaginable within the scope of the following claims, For example the filter housing can be shaped differently than shown. The flow paths can be reversed from those described above. Furthermore the device for opening and closing of the secondary flow paths can be different than shown.

Claims

1. An arrangement for a filter for the purification of oil, for example combustion oil, lubricating oil, hydraulic oil or transformer oil from liquid and particulate impurities which are in suspension, said filter (10) being formed of a filter paper, wound into a roll (12) around a stiff core (11) of a liquid-impermeable material, and a housing (13) , surrounding the filter unit, of liquid-impermeable material which is arranged to guide the liquid flow essentially axially through the filter roll (12) from a high pressure side to a low pressure side, c h a r a c t e r i z e d in that the core (11) is provided with an internal plug (19) proximate the low pressure side of the filter roll, in that the core presents a number of radial passages (26) between the core interior and the filter roll (12) , and in that the core (11) moreover is provided with at least one openable valve (25;27) , with the help of which the interior of the core can be put in flow- connection with the filter roll's (12) low pressure side.
2. Arrangement according to claim 1, c h a r a c t e r i z e d in that a valve (25) is situated proximate the filter roll's (12) high pressure side.
3. Arrangement according to claim 2 , c h a r a c t e r i z e d in that the valve 25) is adjustable to or from a first operating position, in which all the oil passes axially. through the filter roll, to a second operating position, in which the oil can also flow radially into the filter roll via the passages (26) .
4. Arrangement according to claim 1 or 2, c h a r a c t e r i z e d in that the passages (26) are separated along the core (11) in the longitudinal direction with a certain mutual distance.
5. Arrangement according to claim 4, c h a r a c t e r i z e d in that the interior of the core (11) is divided in the axial direction by means of valves (27, 28) which are placed between the passages.
6. Arrangement according to claim 5 , c h a r a c t e r i z e d in that the valves (28) are formed as overflow valves, which are arranged to open at predetermined over-pressure, such that the core's interior can be opened successively in the axial direction with increasing overpressure, in order to open more and more radially directed passages (26) to the filter roll (12) .
PCT/SE1991/000266 1991-04-15 1991-04-15 Filter apparatus for cleaning oil Ceased WO1992018219A1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
ES91910314T ES2084166T3 (en) 1991-04-15 1991-04-15 FILTERING APPARATUS FOR OIL PURIFICATION
US08/133,158 US5484523A (en) 1991-04-15 1991-04-15 Arrangement for a filter for the purification of oil
EP91910314A EP0594614B1 (en) 1991-04-15 1991-04-15 Filter apparatus for cleaning oil
DE69116386T DE69116386T2 (en) 1991-04-15 1991-04-15 FILTER FOR CLEANING OIL
DK91910314.3T DK0594614T3 (en) 1991-04-15 1991-04-15 Oil purifier filter apparatus
AT91910314T ATE132765T1 (en) 1991-04-15 1991-04-15 FILTER FOR CLEANING OIL
JP50961591A JP3161727B2 (en) 1991-04-15 1991-04-15 Filter device for oil purification
PCT/SE1991/000266 WO1992018219A1 (en) 1991-04-15 1991-04-15 Filter apparatus for cleaning oil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE1991/000266 WO1992018219A1 (en) 1991-04-15 1991-04-15 Filter apparatus for cleaning oil

Publications (1)

Publication Number Publication Date
WO1992018219A1 true WO1992018219A1 (en) 1992-10-29

Family

ID=20381744

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1991/000266 Ceased WO1992018219A1 (en) 1991-04-15 1991-04-15 Filter apparatus for cleaning oil

Country Status (8)

Country Link
US (1) US5484523A (en)
EP (1) EP0594614B1 (en)
JP (1) JP3161727B2 (en)
AT (1) ATE132765T1 (en)
DE (1) DE69116386T2 (en)
DK (1) DK0594614T3 (en)
ES (1) ES2084166T3 (en)
WO (1) WO1992018219A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2260713B (en) * 1991-10-23 1995-03-15 Paul Charles Lindberg Fluid filters
RU2412741C2 (en) * 2008-12-08 2011-02-27 Виктор Иванович Немов Oil cleaning filter
US7954647B2 (en) 2000-05-12 2011-06-07 Pall Corporation Filters
US8293104B2 (en) 2000-05-12 2012-10-23 Pall Corporation Filtration systems and fitting arrangements for filtration systems

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5507942A (en) * 1994-02-22 1996-04-16 Davco Manufacturing L.L.C. Fuel filter assembly
US5814214A (en) * 1995-06-29 1998-09-29 Chun; Myung Woo Electronically detectable compound oil filter and its device
SE509113C2 (en) * 1997-04-18 1998-12-07 Aegir Bjoernsson Liquid media feed and filtration systems such as fuels
NL1012700C1 (en) * 1999-07-26 1999-09-16 Triad Holding Bv Filter device for microfiltration of oil, in particular for use with engines, as well as filter housing intended for such a filter device.
US6540909B2 (en) 2001-03-07 2003-04-01 Davco Technology, Llc Fluid filter with pressure relief valve
DE20118682U1 (en) * 2001-11-19 2003-03-27 Hengst GmbH & Co.KG, 48147 Münster Oil filter with control valve in the pure oil pipe
RU2547746C2 (en) 2009-09-17 2015-04-10 Давко Текнолоджи, Ллс Filter assembly with interface provided with dafety valve
CN102937042A (en) * 2011-08-15 2013-02-20 深圳职业技术学院 Oil filter
US10222364B2 (en) * 2017-06-01 2019-03-05 Paul Whiting Health meter for fluids
US10253927B2 (en) * 2017-06-01 2019-04-09 Paul Whiting Health meter for fluids
CN108203596B (en) * 2017-12-26 2020-07-24 铜陵日科电子有限责任公司 Transformer oil immersion recycling method
US10864467B1 (en) * 2019-12-03 2020-12-15 Micron Eagle Hydraulics, Inc. Health meter
US11772025B1 (en) 2022-08-02 2023-10-03 W. L. Gore & Associates, Inc. Industrial filter assembly enhancement

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986003687A1 (en) * 1984-12-18 1986-07-03 Leslie Donald Selsdon Filters
GB2204250A (en) * 1987-05-08 1988-11-09 Eiichi Sugiura Oil/water filter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2522502A (en) * 1945-07-28 1950-09-19 Auto Appliance Patents Co Filter
US4306966A (en) * 1980-08-14 1981-12-22 Claude A. Patalidis Heat controlled filter by-pass
US4869820A (en) * 1987-11-13 1989-09-26 Gary Karlin Filter apparatus for fluids with co-axially stacked filter elements
DE4030304C2 (en) * 1990-09-25 1994-10-27 Hermann Trabold Filters for filtering gaseous and liquid media

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986003687A1 (en) * 1984-12-18 1986-07-03 Leslie Donald Selsdon Filters
GB2204250A (en) * 1987-05-08 1988-11-09 Eiichi Sugiura Oil/water filter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2260713B (en) * 1991-10-23 1995-03-15 Paul Charles Lindberg Fluid filters
US7954647B2 (en) 2000-05-12 2011-06-07 Pall Corporation Filters
US8293104B2 (en) 2000-05-12 2012-10-23 Pall Corporation Filtration systems and fitting arrangements for filtration systems
RU2412741C2 (en) * 2008-12-08 2011-02-27 Виктор Иванович Немов Oil cleaning filter

Also Published As

Publication number Publication date
JP3161727B2 (en) 2001-04-25
EP0594614B1 (en) 1996-01-10
DK0594614T3 (en) 1996-05-20
DE69116386T2 (en) 1996-09-05
JPH06506388A (en) 1994-07-21
US5484523A (en) 1996-01-16
ES2084166T3 (en) 1996-05-01
EP0594614A1 (en) 1994-05-04
DE69116386D1 (en) 1996-02-22
ATE132765T1 (en) 1996-01-15

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