GB2065336A - Automatic level control system for an oil contaminant - Google Patents

Automatic level control system for an oil contaminant Download PDF

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Publication number
GB2065336A
GB2065336A GB8037380A GB8037380A GB2065336A GB 2065336 A GB2065336 A GB 2065336A GB 8037380 A GB8037380 A GB 8037380A GB 8037380 A GB8037380 A GB 8037380A GB 2065336 A GB2065336 A GB 2065336A
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United Kingdom
Prior art keywords
level
contaminant
probe
vent
water
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Granted
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GB8037380A
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GB2065336B (en
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Mackenzie J R S
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Mackenzie J R S
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Priority to GB7940533 priority Critical
Application filed by Mackenzie J R S filed Critical Mackenzie J R S
Priority to GB8037380A priority patent/GB2065336B/en
Publication of GB2065336A publication Critical patent/GB2065336A/en
Application granted granted Critical
Publication of GB2065336B publication Critical patent/GB2065336B/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D33/00Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D17/00Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02Separation of non-miscible liquids
    • B01D17/0208Separation of non-miscible liquids by sedimentation
    • B01D17/0214Separation of non-miscible liquids by sedimentation with removal of one of the phases
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G33/00Dewatering or demulsification of hydrocarbon oils
    • C10G33/08Controlling or regulating
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/24Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by water separating means
    • F02M37/26Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by water separating means with water detection means
    • F02M37/28Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by water separating means with water detection means with means activated by the presence of water, e.g. alarms or means for automatic drainage
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/54Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by air purging means
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm
    • G01F23/22Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm by measurement of physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/24Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm by measurement of physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
    • G01F23/241Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm by measurement of physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid for discrete levels
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm
    • G01F23/22Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm by measurement of physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm by measurement of physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm by measurement of physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields using capacitors
    • G01F23/265Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm by measurement of physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields using capacitors for discrete levels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements

Abstract

The level of water or air contaminating oil in a separator or reservoir is prevented from becoming excessive by a system in which a vent valve or pump 13, 14 is automatically opened when a first probe detects its presence and remains open for a prescribed time after the pulse is clear, and a second probe is provided which gives an alarm indication, and also energises the motor/valve, if that too detects the contaminant, for a longer period than the first. The system may be in the fuel supply to a I.C. engine, which may be stopped if the second probe remains activated for a prescribed time. To improve reliability the control circuit includes redundant transistors. As shown, conductive probes 3, 4 detect water, which is vented until the level drops to approximately D. For air, capacitive probes are used (Fig. 5). A particular water probe is described in which annular conductive elements are sheathed in hydrophilic sulphonate polymer, which is permeable to water but not to mineral oil. <IMAGE>

Description

SPECIFICATION Device for discharging water and/or air contaminant from a mineral oil-contaminant separator or from a mineral oil reservoir and separator having such a device This invention relates to a device for discharging water and/or air contaminant from a mineral oil-contaminant separator or from a mineral oil reservoir and to a separator having such a device. Such a device is attachable to a separator which in turn is suitable for attachment in a mineral oil line such as a petrol, diesel or fuel oil line.
The presence of water as a contaminant in mineral oil is particularly disadvantageous when the mineral oil is used as a fuel such as is the case with petrol, diesel or fuel oil. This is particularly the case with diesel engined boats or land vehicles in which the presence of water in the diesel fuel causes corrosion of the fuel injector system with consequent reduction of the efficiency thereof and eventual complete breakdown thereof.
In order to avoid this problem it has been proposed to provide a mineral oil-water separator in the diesel fuel line between a fuel tank and the fuel injector. Conventionally such a separator has a separator cone which separates incoming mineral oil-water mixtures into a layer of oil floating on a layer of water in a bowl of the separator. The bowl contains a float which operates a valve controlling an outlet for mineral oil from the separated oil layer which float closes the outlet when the water level in the bowl exceeds a desired level. Conventionally such a separator includes either an electrically conductive sensor probe or a make and break switch contact actuable by the position of the float in the bowl, which trigger an alarm when the water in the bowl exceeds a desired level whereupon the water is manually or automatically vented from the bowl.
With the first kind of proposed separator having the electrically conductive sensor it is necessary when the alarm sounds to indicate excess water in the separator bowl, to shut down the engine, drain the water from the bowl, open vents on the engine and use a hand priming pump or a lift pump to bleed the fuel system. In practice operators tend not to stop when the alarm sounds as venting the water is a dirty time consuming job which should preferably be done off the road as the wasted fuel will dissolve tarmac. Therefore most operators try to reach their destination prior to venting where the job can be done under cover or left for someone else. This can result in passage of water to the fuel injector system with consequent deterioration thereof.
The second kind of proposed separator which uses a float operated alarm reed switch operated by a magnet carried on the float has the same drawback if manual venting is required. If alternatively, as has been proposed, the closing of the switch is to energise a dumping device there is still the problem of venting fuel as well as water, and allowing air to enter the fuel line with consequent necessity for shutting down the engine and bleeding the fuel line. Additionally as the venting takes place under the action of gravity alone, venting may take a considerable time. The float in such a separator is also subject to vibration in use with consequent risk of premature alarm actuation.
There is thus a need for a generally improved device for discharging water from the water-trap bowl of a mineral-water separator or from a mineral oil reservoir, which can readily be fitted to existing conventional mineral oil-water separators, which functions in a reliable manner, with a minimum of moving parts and which provides automatic water venting in a quick and easy manner avoiding the necessary for bleeding the mineral oil line after use of the device and minimising venting of mineral oil with the water.
The presence of air as a contaminant in mineral oil such as diesel fuel will, if it reaches the fuel injector pump and thus the high pressure system, cause the diesel engine to stop through fuel starvation. This is because the fuel injectors are operated hydraulically. To re-start the engine it is necessary mechanically to loosen the injectors and 'bleed' the fuel system until all the air has been removed. Bleeding the fuel system is a time consuming operation which risks damage to the injectors and is very wasteful of fuel.
One known device senses the presence of air with a float, which, as it falls, opens a valve allowing the transfer pump to lift more fuel into the device. The air vent is connected by a return line to the top of the fuel tank.
This known device is a passive device which relies on the transfer pump to expel the air from the unit. However, certain modern diesels have the transfer pump as an integral part of the high pressure pump and in these installations the known device cannot be used.
Thus there is the need also for an improved device for removing air from mineral oil which is not dependent on external pumps.
According to the present invention there is provided a device for discharging water and/ or air contaminant from a contaminant trap bowl of a mineral oil-contaminant separator or from a mineral oil reservoir, including a contaminant sensor having first and second probes with conductive and non-conductive elements, a contaminant vent means having an openable and closable vent passage connectible to a source of vacuum, and a fail safe electric control circuit connectible to a source of electrical power, to the conductive elements of the contaminant sensor probes, to the contaminant vent means and to an audible and/or visual alarm means and operable to open the vent passage and operate the alarm means in response to electrical conductivity or capacitance changes registered by the probes and to close the vent passage, the device being such that the contaminant sensor and contaminant vent means are removably or fixedly attachable in an opening through the bowl or the reservoir wall to project into the bowl or reservoir interior in a manner such that the contaminant vent means is located at a first level, the first probe extends to or is located at an intermediate level spaced from the contaminant vent means and the second probe extends to or is located at a second level on the opposite side of the intermediate level to the first level, in the bowl or reservoir and being operable, with the contaminant sensor and contaminant vent means so attached and connected to the control circuit, a source of vacuum, a source of electrical power and alarm means, that when contaminant reaches the intermediate level in the bowl or reservoir the first probe conductive element opens the vent means passage via the control circuit to vent contaminant from the bowl or reservoir until after a preset interval, which commences when the contaminant level returns to the first level side of the intermediate level, the control circuit closes the vent passage and if contaminant reaches the second level in the bowl or reservoir the second probe conductive element additionally operates the alarm means via the control circuit whilst continuing to open the vent means passage.
Preferably wherein the contaminant to be discharged is water, the first level is a low level below the intermediate level, the second level is a higher level above the intermediate level, and the probes register electrical conductivity changes.
Preferably the water vent means includes a conductive elongated hollow housing having at least one inlet aperture opening through a wall thereof adjacent one end of the housing, at a point corresponding to the desired low level, into the vent passage which extends through the housing in the direction of the longitudinal axis thereof.
Advantageously the housing is externally screw-threaded for releasable engagement in a correspondingly screw threaded drain outlet of the bowl or reservoir. The housing preferably carries, at one end thereof adjacent the inlet aperture, the first and second probes which are elongated in form and project therefrom in the general direction of the longitudinal axis of the housing.
Additionally the second probe preferably is longer than the first probe and the conductive elements of the probes are connected to the control circuit via leads passing through the housing in the general direction of the longitudinal axis thereof.
Preferably the contaminant vent means in cludes an electric pump and an openable and closable valve connected to the control circuit and operable thereby. This control circuit ad vantageously includes an integrated circuit chip of the kind designated NE556, one half of which provides a control switch for the first probe and is connected at its input side to the first probe and at its output side via a pair of transistors in parallel, to the pump, the pair of transistors providing a dual safety on/off switch sub-circuit for the pump. The other half of the integrated circuit chip provides a con trol switch for the second probe, pump and for the alarm means and has its input side connected to the second probe for actuation thereby and its output side connected to an electric alarm of the alarm means via a diode.
Preferably a test button switch is provided in the control circuit between the first probe and the one half of the inregrated circuit chip to activate the pump for test purposes.
Alternatively wherein the contaminant to be discharged is air, the first level is a high level above the intermediate level, the second level is a low level below the intermediate level and the probes register capacitance changes.
For a better understanding of the present invention and to show how the same may be carried into effect reference will now be made, by way of example, to the accompanying drawings, in which: Figure 1 is a diagrammatic part sectional view of a device of the invention in operative association with a water-trap bowl of a min eral oil-water separator, Figure 2 is a schematic circuit diagram of an electric control circuit forming part of the device of Fig. 1, Figure 3 is a schematic circuit diagram of means for preventing reverse polarity transient voltages in part of the circuit of Fig. 2, Figure 4 is a diagrammatic side view of part of a device of the invention according to a second embodiment, and Figure 5 is a diagrammatic part sectional view of a water discharge device of the inven tion in combination with air discharge device of the invention.
As shown in the accompanying drawings, in particular in Fig. 1 thereof, a device of the invention, generally referenced 1, for dis charging water from a water-trap bowl 2 of a mineral oil-water separator (not shown) is suit able for location in a mineral oil flow line such as a petrol or diesel line between a reservoir and an engine using the petrol or diesel oil as fuel. For convenience such a device will be described hereinafter in terms of usage in the fuel system of a diesel engined land vehicle although it is to be understood that the device is equally suitable for marine and other envi ronments and for other systems involving flow of mineral oil from which contaminant water requires to be separated. Alternatively the device 1 is suitable for attachment in a prefer ably static mineral oil reservoir.
As shown in Fig. 1 the device 1 of the invention includes a water sensor having a first probe 3 with a conductive element 3a and a non-conductive element 3b and a second probe 4 with a conductive element 4a and a non-conductive element 4b, a water vent means having an openable and closable vent passage 5 connectible to a source of vacuum, and a fail safe electric control circuit 6 shown in more detail in Fig. 2 connectible to a source of electrical power (not shown), to the conductive elements 3a and 4a of the water sensor probes 3 and 4, to the water vent means and to an audible and/or visual alarm means (not shown). The device is operable to open the vent passage 5 and operate the alarm means in response to electrical conductivity changes registered by the probes 3 3 and 4 and to close the vent passage 5.
Thus the conductive elements of the probes register the electrical conductivity changes resulting from the presence of water or mineral oil and operate only when the electrical conducitivity value associated with water in contact with the conductive elements 3a and 4a of the probes is reached.
The device 1 is so designed that the water sensor and water vent means are removably or fixedly attachable in an opening 7, conveniently the conventional water outlet vent, through the wall of the bowl 2 to project into the interior of the bowl 2. The device is so located in conjunction with the bowl 2 that the water vent means is located with its at least one inlet aperture 8, in this case a plurality of such apertures, located at a low level A in the bowl 2, the first probe 3 extends to an intermediate level B from which level the conductive element 3a extends and the second probe 4 extends to a higher level C in the bowl 2, from which level the conductive element 4a extends.The device is operable, with the water sensor and water vent means attached to project into the bowl 2 as aforesaid, and connected to the control circuit 6, a source of vacuum (not shown), a source of electrical power (not shown) and alarm means (not shown), so that when water reaches the intermediate level B in the bowl 2 the first probe 3 opens the vent means passage 5 to vent water from the bowl 2 via the inlet apertures 8 which communicates with the passage 5, for a preset interval after the water level falls below the intermediate level B, returning the water level to a lower level D, or below, whereafter the control circuit 6 closes the vent passage 5 once again.If the rise of the water level in the bowl 2 temporarily exceeds the capacity at which it can be vented from the passage 5, as soon as the water level in the bowl 2 reaches the second probe conductive element 4a it operates alarm means (not shown) via the control circuit 6.
Operation of the alarm during engine running can indicate either a failure of the first probe 3 or serious separator flooding. On operation of the alarm the operator can stop the engine and check the device to see if it is venting water. If it is not then the vacuum source may have failed. If the device is venting water, the first probe may have failed. The preset interval of the alarm circuit is longer to compensate for the greater volume of water to be vented in this case.
The water vent means has an elongated hollow housing 9 preferably made of a material resistant to the corrosive action of water, such as stainless steel, or other suitable conductive material. The housing 9 have the inlet aperture or apertures 8 opening through a wall thereof or in a separate fitting, which may be made of plastics material, adjacent one end of the housing 9, at a point corresponding to the desired low level A in the bowl 2, into the vent passage 5 which extends through the housing 9 in the direction of the longitudinal axis thereof. The housing 9 is provided with means for sealingly and releasably securing it to the bowl 2 in the desired position. To this end it is externally screw threaded, either directly or through the intermediary of an annular collar such as 10, fixedly secured thereto as shown in Fig. 1.
The screw threads on the annular collar 10 are releasably engaged in the correspondingly screw threaded drain outlet or opening 7 of the bowl 2 to project thereinto in the desired manner. The housing 9 carries, at one thereof adjacent the inlet aperture or apertures 9, the probes 3 and 4 which are elongated in form and project therefrom in the general direction of the longitudinal axis of the housing 9.
These probes are of any convenient form having non-conductive and conductive elements and are operable to register a change in electrical conductivity between the probes and the electrically conductive housing 9 occasioned by the presence of mineral oil, or water therebetween. The presence of water in the bowl 2 at the conductive element of the probes causes a change in electrical conductivity sufficient to trigger the control circuit 6 in a manner which will be hereinafter described. As shown in Fig. 1 the second probe 4 is longer than the first probe 3 so that the conductive elements thereof are at the appropriate levels corresponding respectively to level C and B. The conductive elements of the the probes 3 and 4 are connected to the control circuit 6 via leads such as lead 11 for the first probe conductive element 3a and lead 12 for the second probe conductive element 4a.The leads 11 and 12 pass through the housing 9 from the probes in the general direction of the longitudinal axis of the housing 9.
The water vent means preferably includes an electric pump 13 such as shown in Fig. 1 and an openable and closable non-return valve 14 connected to the control circuit and operable thereby. The pump 1 3 is any convenient pump such as an electrically operated windscreen washer pump. Alternatively the pump 13 may be dispensed with and the vent passage 5 connected to any convenient source of vacuum such as the inlet manifold of the engine in whose fuel system the mineral oil-water separator and discharge device of the invention are connected. With such an alternative the vent passage 5 is connected so as to be subjected to a suction effect produced at the inlet manifold, when the nonreturn valve 14 is opened by the control circuit 6. If desired the connection of the vent passage 5 to the inlet manifold may be via a filter.By locating the water vent inlet aperture or apertures 8 at the level A some distance above the lowest point in the bowl 2 is possible to avoid discharging solid particles.
By regulating the interval during which the vent passage 5 is open it is possible to avoid discharging mineral oil from the bowl 2 as the vent passage 5 will be closed as soon as the water level drops to approximately the level D so that mineral oil in the layer above the water layer will not be discharged. Additionally the non-return valve 14 presents ingress of air to the interior of the bowl 2.
The control circuit 6 as shown in Fig. 2 includes an integrated circuit chip of the kind designated NE556, one half of which ICla provides a control switch for the first probe 3.
The chip half ICla is connected at its input side via the lead 11 to the first probe 3. The output side of the chip half ICla is connected at 15 via a diode D1 and a pair of transistors TR1 and TR2 in parallel, to the pump 13. The transistors TR1 and TR2 provide a duel safety on/off switch sub-circuit for the pump 13 and each transistor is series with a respective resistor. Thus diode D1 is connected via a resistor R2 to the base electrode of the transistor TR1 and the diode D1 is connected via a resistor R3 to the base electrode of the transistor TR2. The transistor emitter electrodes are earthed and the collector electrodes are connected to the pump 13.
The integrated circuit chip NE556 commonly used in process timing is such that its input terminal connected to lead 11 for the half ICla is extremely sensitive. Thus when the first probe 3 is wet a very low current can flow between it and earth and this triggers the circuit chip half ICla to operate. It continues to operate, delivering an output to its output 15 for as long as a given voltage does not exist at terminals 16 and 17. These terminals are connected in an R-C chain in which resistor R4 and condenser C2 together make a resistor-capacitor timing circuit and govern the time taken to reach the set predetermined voltage. The condensor C2 charges up via the resistor R4 until the voltage at terminals 16 and 17 equals two-thirds Vcc. When this occurs ICla shuts off.The timer reset on terminal 18 is permanently connected to Vcc so that the timer is reset as soon as it switches off.
While ICla is on, the current flows through the outlet 15. diode D1 and resistor R2 and causes transistor TR 1 to conduct. Due to the same signal at output 15 a current flows through resistor R3 and transistor TR2 and the latter is caused to conduct. Hence the pump 13 is electrically connected and pumps out liquid from the bowl 2 via the vent passage 5. Once the circuit chip half ICla stops operating the transistors TR 1 and TR2 cease to conduct and the pump stops working. This only occurs once water is no longer in contact with the conductive element 3a of the first probe 3. Thus the chip half ICla triggers at output 15 the transistors TR1 and TR2 when the timer is triggered.In this subcircuit two transistors are provided as a precautionary measure so that if one transistor fails the pump 13 will still be switched by the remaining transistor.
The second probe 4 is connected via its lead 12 to the input terminal of the second half IClb of the integrated circuit chip NE556.
The second half IClb functions in a similar manner to that of the first half ICla to provide a control switch for the second probe 4 and for alarm means 19 conveniently in the form of an electrically operated alarm bell, buzzer or light. The output terminal 20 of the chip half IClb is connected via a diode D2 to the input sides of the resistors R2 and R3 of the pump switching transistors TOR 1 and TR2. The output terminal 20 additionally is connected via a resistor R6 to the base electrode of a transistor TR3 whose emitter electrode is earthed and whose collector electrode is connected to the alarm means 19. Thus the presence of water on the conductive element 4a of the probe 4 causes a low current to flow between it and earth triggering the chip half IClb to operate.This produces an output signal at the output terminal 20 which causes a current to flow through resistor R6 and transistor TR3 to cause the alarm to operate.
At the same time the current flows through diode D2, resistors R2 and R3 and transistors TRI and TR2 to actuate the pump 13. A further resistor-capacity network including a resistor R7 in series with a condensor C7 is connected between the current supply and earth across terminals 21 and 22 of the chip half IClb. Thus when the conductive element 4a of the probe is wet the pump 13 runs for a period determined by the resistor-capacitor network R7, C7, typically longer than the period determined by R4, C2.
Should the first probe 3 fail the water level in the bowl 2 will rise until it reaches the conductive element of the second probe 4.
This will trigger the chip half IClb which in turn actuates the alarm means 19 and the pump 13. An important feature of the control circuit 6 is that under no circumstances must transient voltage fluctuations on the, for example, 12 volt power line, cause inadvertent triggering of either of the chip halves ICla and IClb. Such inadvertent triggering could cause the device 1 to vent mineral oil from the bowl 2 which is undesirable. Such inadvertent triggering is prevented in a number of ways.
Firstly the chip IClb is a standard integrated circuit which operates as an accurate voltage regulator and hence the voltage on the input power line (12 volts) is accurately stabilised.
Secondly a diode D3 in series with the pump 13 and the valve, Fig. 3, prevents reverse polarity transient voltages. Thirdly the terminals 11 and 12 of the respective chip halves are provided with respective resistor-capacitor networks which tend to insulate the input terminals 11 and 20 from any transient voltage fluctuation on the input power line (12 volt). Thus in the case of the first chip half ICla a resistor R1 and a condensor C1 are connected in parallel between the input power line and the lead 11 between the first probe 3 and input terminal of the chip half ICla.
Similarly a condensor C8 and a resistor R5 are connected in parallel between the input power line and the lead 12 connecting the output terminal of the chip half IClb to the second probe 4. These latter resistor capacitor networks have the effect of stopping triggering of the respective chip halves when the power supply (or ignition) is turned on and reduce the sensitivity of the probes 3 and 4 to a a suitable level.
A further feature of the control circuit 6 is that if one or other of the chip halves ICla and IClb become inoperative the device 1 of the invention would still function satisfactorily.
Equally so one or other of the transistors TR 1 and TR2 could become inoperative as well as one or other of the chip halves ICla and IClb and the circuit 6 would still function. If, for example, the chip half ICla becomes inoperative the water level in the bowl 2 would rise passed the conductive element 3a of the first probe 3 without actuating the pump 13.
When the water level reaches the conductive element 4a of the second probe 4 a signal would be produced at the input terminal of the chip half IClb connected via the lead 12 to the second probe 4 which in turn would produce a signal at the output terminal 20 which would energise both transistors TR1 and TR2 or which ever one of these is working, so causing the pump 13 to be operated with consequent discharge of water from the bowl 2 via the vent passage 5. It is, of course, to be understood that the pump 13 is connected between the output from the transistors TR1 and TR2 and the input power line (12 volts) so that when either one of the transistors TR1, TR2 conducts current is supplied to the pump.
Preferably a test button 23 is provided for control circuit 6 between the first probe 3 and the chip half ICla to actuate the pump 13 for test purposes. The test button 23 is connected via a resistor R8 to the input terminal of the chip half ICla via the lead 11 and operates when activated to place a signal at the input terminal of the chip half ICla which is equivalent in electrical terms to the signal provided at this input terminal when the first probe 3 is wet. Consequently the test button provides a means whereby a full check of the satisfactory operation of the control circuit 6, and pump 13 can be carried out.
Although the control circuit 6 has been described in the foregoing in terms of operation with a 12 volt power supply it can, of course, be operated with other supply voltages for example 24 volts. In this case connection is made, as for 12 volt supply, to an integrated chip, such as IC2, which is of a type commonly designated 78L12. The chip IC2 is connected between the input power line (24 volts or 12 volts) and earth via a condensor C6, and also aids in preventing triggering of the circuit when the power is connected.
Suitable values for the resistors and condensors are, for example, as follows. All resistors are quarter watt except R2, R3 and R6 which are half watt. Resistors R1 and R7 have values of 4 kilo ohms. Resistors R2, R3 and R6 have values of 150 ohms. Resistors R4 and R5 have values of 47 kilo ohms and resistor R8 has a value of less than 4 kilo ohms. Capacitors C2 and C7 have values of 100 micro farads. Capacitor C1 has a value of 0.1 micro farads. Capacitors C3, C5 and C8 have values of 0.01 micro farads and capacitor C6 has a value of 47 micro farads. The transistors TR1, TR2 and TR3 conveniently are of the type designated BD 437.
In operation the actuation of the alarm during engine running could indicate either failure of the probe 3 or serious water flooding of the bowl 2 of the mineral oil-water separator. When the alarm 19 operates the engine being supplied with mineral fuel should be stopped but the ignition left on.
The device can then be inspected visually to see if it is venting water. If it is not then the test button 23 should be operated. If this fails to operate the pump 13 either both switching transistors TR1 and TR2 have failed, the pump 13 has jammed with grit or the pump has burned out which requires either replacement of the control circuit 6 or replacement of the pump 13. In all cases where the alarm operates when the ignition is switched on and after a short time ceases to operate, the bowl 2 2 of the mineral oil-water separate has flooded from the mineral oil reservoir whilst the equipment has been standing idle for a lengthy period of time. In this case if the test button fails to cause operation of the pump 13 then only the half ICla of the integrated circuit chip has failed.
In normal operation the engine does not require to be stopped as removal of water from the mineral oil is automatic. Even in the case of severe water contamination water will be vented from the bowl 2 continuously while the alarm means 19 operate to give warning of an abnormal situation. As the water level in the bowl 2 returns to normal the alarm warning will stop. Mineral oil is not vented in normal operation although the device can be cycled by means of the test button 23 to check on cleaniness of the mineral oil, operation of the device or remove water in freezing conditions. There is thus no intake of air into the mineral oil supply line with operation of the device of the invention and no requirement for bleeding the mineral oil line of air as is the case with conventional mineral oil-water separator units.Moreover, as the device of the invention does not use a float to control operation of the alarm means 19 and pump 13 it is not adversely effected by vibration as float operated mineral oil-water separator units can be. The components of the device of the invention can be made from any convenient materials and can be of any convenient conventional form and type. Conveniently the component contacted by the mineral oil-water are resistant to corrosion thereby. Conveniently the pump 13, valve 14, control circuit 6 and test button 23 are housed in a case from which the probe end of the housing 9 projects. In this way the device forms a unit which can readily be fitted and removed.
Although in the foregoing the device of the invention has been described in operative association with the water trap bowl 2 of a mineral oil-water separator it is, of course, to be understood that the device of the invention is attachable directly in a mineral oil reservoir or fuel tank so that the probes 3 and 4 and inlet aperture or apertures 8 are located at the desired levels A, B and C in the mineral oil or fuel tank itself. Conveniently this is done by threadably engaging the housing 9 in a threaded aperture in the bottom of the fuel tank. In this latter mode of utilisation the device of the invention will project into the bottom region inside the mineral oil or fuel tank where any water could be likely to collect in a layer below the mineral oil layer.Such attachment is more likely to be appropriate in fixed installations where no agitation of the mineral oil or fuel tank is expected.
The embodiment of the invention illustrated in Fig. 4 basically is similar to that of Fig. 1 and preferably uses the same circuitry as illustrated in Figs. 2 and 3. The same reference numerals as used in Fig. 1 will therefore be used in Fig. 4 for like parts. For convenience the bowl 2 and water vent means are not shown in Fig. 4. As shown in Fig. 4 the water vent inlet aperture 8 is, in this embodiment, a single aperture which preferably incorporates a filter mesh or screen as shown.
However, in this embodiment the water vent hollow housing 9 extends in a hollow extension part 9a to above the height of the probe conductive elements 3a and 4a. These elements are at least part annular and preferably in the form of rings around the part 9a and include an at least part annular earth return 24, preferably in the form of a ring, provided to reduce or obviate electrolytic attack at the junction between the housing 9 and the bowl 2. Preferably the housing 9 is made from brass, and bowl 2 from aluminium, and the part 9a from a plastics material.
Additionally each of the probe elements 3a and 4a and the earth return ring 24 are provided with sheaths of a material permeable to water but not to mineral oil fuel such as diesel fuel. These sheaths ensure that there is no likelihood of the mineral oil building up on the probe elements 3a or 4a or earth return ring 24, thereby impairing or changing the conductivity of the elements or ring and impairing the operation of the device. Conveniently the material used for the sheaths is a hydrophilic polymer membrane, preferably a cross-linked polymer, which can separate molecules according to size, charge or other properties, i.e. a so-called ultrafiltration membrane. Suitable materials are sulphonate polymers such as styrene-based polymers with sulphonate groups exposed at the membrane surfaces and within the pores.
The present invention also contemplates the provision of a mineral oil-water separator for location in an oil flow line, which separator includes a device 1 as hereinbefore described.
Such a separator as shown in Fig. 5 has a water-trap bowl 2 preferably moulded from rubber, attached to a body 25, preferably made of aluminium, provided with an inlet 6 for oil/water to be separated, oil/water separation means, such as a separator cone 27, preferably moulded from rubber to minimise icing, communicating with the inlet and bowl and operative to separate the oil and water into two layers with the oil layer uppermost in the bowl 2. An outlet 28 is provided in the body for receiving oil from the oil layer. A device 1 for discharging water from the bowt 2 is included which device corresponds to the device 1 hereinbefore described. Such a separator is suitable for connection in a diesel fuel line between a fuel tank and a fuel injector system for a diesel engine. As shown a pump 1 3 is provided for actuation from the diesel engine power line via the control circuit 6 and in conjunction with the valve 14 which conveniently acts in this case as a non reuturn valve preventing ingress of air to the system when water is being vented from the passage 5. The device 1, of course, includes the probe assembly and housing 9 of Figs. 1 or 4 projecting into the base of the bowl 2 which functions are previously described, with a con trol circuit such as shown in Figs. 2 and 3.
Additionally the embodiment of Fig. 5 includes means for discharging air from the water-trap bowl 2 of the separator or from a mineral oil reservoir and this air discharge means may be used in combination with the devices of Figs. 1 to 4. As shown in Fig. 5 the body 25 is provided with a top cover 29, preferably of a die cast aluminium, conveniently bolted to the body 25 by a through bolt 30. This cover 29 is provided with an elongated uppermost internal chamber part 31 communicating via the interior of the cover 29 with the interior of the bowl 2. Any air in the the mineral oil/water mixture entering the interior of the cover 29 via the inlet 26 will separate out from the mixture and collect in the elongated uppermost internal chamber part 31.In order to vent collected air from the chamber part 31 the air discharge means includes an elongated tube 32 opening at one end via an air vent inlet port 33 into the upper part of the chamber part 31 and opening at the other end via an air vent outlet port 34 34 to a pump and non-return valve system (not shown) similar to that described in conjunction with the previous embodiments.
In order to sense the presence of air in the chamber part 31 and initiate an air discharge action, the air discharge means also has two probes as is the case with the water discharge means. These two probes now are each in the form of capacitor plates attached to the outer surface of the air tube 32 in any convenient way to extend preferably parallel thereto. The plates are spaced apart radially with respect to the tube 32 by a distance such as to permit mineral oil/water mixture to flow thereto, and not to be trapped therebetween by capilliary action. A suitable distance is of the order of one eighth of an inch. The first capacitor probe 35 is located at a convenient distance on the tube 32 below the port 33 and the second capacitor probe 36 is located a convenient distance on the tube 32 below and spaced from the probe 35.
Thus in operation when the presence of air in the chamber part 31 depresses the mineral oil/water mixture level therein initially to the intermediate level of the first probe 35, the change of capacity thereof is utilised to trigger an air vent system utilising a pump, a valve and an alarm similar to that illustrated in Figs.
2 and 3 for the previous embodiments, which vents air via port 33 until the level returns to above the first probe or for a fixed period of time. If the level of the mineral oil/water mixture in the chamber part 31 reaches the lowermost level of the second probe 36 the change of capacitance therein triggers the alarm as well as continuing to vent air. Thus if approximately 10 cubic centimetres of air in the chamber part 31 cause the first probe 35 to trigger the air discharge the pump may operate for a time sufficient to discharge approximately 40 cc of air and mineral oil/water mixture. Conveniently the air pump outlet is connected via a return conduit to the top of mineral oil reservoir to prevent oil wastage.
Thus the air pump, when at rest, can be selfprimed with oil allowing it to operate efficiently against considerable negative pressure.
A test button 37 is provided for testing the water sensor and vent means and a test button 39 for testing the air sensor and sicharge means. 38 refers to an electrical connector terminal block.
Although in the Fig. 5 embodiment the water discharge means and the air discharge means have been described in combination, it is of course to be understood that they may be provided separately from one another as well as in combination.
In the foregoing embodiments timer switch means preferably are provided for automatically shutting down an engine utilising the mineral oil as fuel. Such shut down timer switch means may be operated by either the water discharge control circuitry per se or the air discharge control circuitry or by both. Thus the presence of sufficient water and/or air to actuate the appropriate alarm triggers a solenoid after a period t1, of for example two minutes, which switches off the engine for a period t2 of for example two minutes. During this period t2 the engine cannot be re-started but after t2 the engine can be re-started and run for a period t3. If after the period t3 (preferably two minutes) the alarm still goes the engine is once more shut down by the solenoid which is isolated to prevent re-starting until the problem has been erradicated. Of course, if the alarm ceases during periods t1, t2 and t3 the engine continues to run.

Claims (19)

1. A device for discharging water and/or air-contaminant from a contaminant-trap bowl of a mineral oil-contaminant separator or from a mineral oil reservoir, including a contaminant sensor having first and second probes with conductive and non-conductive elements, a contaminant vent means having an openable and closable vent passage connectible to a source of vacuum, and a fail safe electric control circuit connectible to a source of electrical power, to the conductive elements of the contaminant sensor probes, to the contaminant vent means and to an audible and/or visual alarm means and operable to open the vent passage and operate the alarm means in response to electrical conductivity or capacitance changes registered by the probes and to close the vent passage, the device being such that the contaminant sensor and contaminant vent means are removably or fixedly attachable in an opening through the bowl or the reservoir wall to project into the bowl or reservoir interior in a manner such that the contaminant vent means is located at a first level, the first probe extends to or is located at an intermediate level spaced from the contaminant vent means and the second probe extends to or is located at a second level on the opposite side of the intermediate level to the first level, in the bowl or reservoir and being operable, with the contaminant sensor and contaminant vent means so attached and connected to the control, circuit, a source of vacuum, a source of electrical power and alarm means, that when contaminant reaches the intermediate level in the bowl or reservoir the first probe conductive element opens the vent means passage via the control circuit to vent contaminant from the bowl or reservoir until after a preset interval, which commences when the contaminant level returns to the first level side of the intermediate level, the control circuit closes the vent passage and if contaminant reaches the second level in the bowl or reservoir the second probe conductive element additionally operates the alarm means via the control circuit whilst continuing to open the vent means passage.
2. A device according to claim 1, wherein the contaminant to be discharged is water, the first level is a low level, the second level is a higher level above the intermediate level, and the probes register electrical conductivity changes.
3. A device according to claim 2, wherein the water vent means includes a conductive elongated hollow housing having at least one inlet aperture opening through a wall thereof adjacent one end of the housing, at a point corresponding to the desired low level, into the vent passage which extends through the housing in the direction of the longitudinal axis thereof.
4. A device according to claim 3, wherein the housing is externally screw-threaded for releasable engagement in a correspondingly screw threaded drain outlet of the bowl or reservoir.
5. A device according to claim 3 or claim 4, wherein the housing carries, at one end thereof adjacent the inlet aperture, the first and second probes which are elongated in form and project therefrom in the general direction of the longitudinal axis of the housing.
6. A device according to any one of claims 3 to 5, wherein the second probe is longer than the first probe and the conductive elements of the probes are connected to the control circuit via leads passing through the housing in the general direction of the longitudinal axis thereof.
7. A device according to any one of claims 1 to 6, wherein the vent means includes an electric pump and an openable and closable valve connected to the control circuit and operable thereby.
8. A device according to any one of claims 2 to 6, wherein the water sensor first and second probe conductive elements are at least part annular and extend around a hollow extension part of the housing.
9. A device according to claim 8, including an at least part annular earth return extending around the hollow extension part below the water vent means.
10. A device according to claim 8 or claim 9, wherein the at least part annular probe conductive elements and/or earth return is/are provided with a sheath or sheaths of a material permeable to water but not to mineral oil.
11. A device according to claim 10, wherein the material is a hydrophilic sulphonate polymer.
12. A device according to claim 1, wherein the contaminant to be discharged is air, the first level is a high level above the intermediate level, the second level is a low level below the intermediate level and the probes register capacitance changes.
13. A device according to claim 12 wherein the air sensor probes are each in the form of a plate capacitor.
14. A device according to claim 14, wherein the air vent means includes an openable and closable valve connected to a control circuit and operable thereby.
1 5. A device according to claim 7 or claim 14, wherein the or each control circuit includes an integrated circuit chip of the kind designated NE556, one half of which chip provides a control switch for the first probe and is connected at its input side to the first probe and at its output side via a pair of transistors in parallel, to the pump, the pair of transistors providing a dual safety on/off switch sub-circuit for the pump, and the other half of which chip provides a control switch for the second probe, pump and for the alarm means and has its input side connected to the second probe for actuation thereby and its output side connected to an electric alarm of the alarm means via a transistor and to the pump transistors at the first half output side via a diode.
16. A device according to claim 15, wherein a test button switch is provided in the or each control circuit between the first probe and the one half of the integrated circuit chip to activate the pump for test purposes.
17. A device according to any one of claims 1 to 16, including timer-switch means connectible to an engine intended to run on mineral oil being treated and operable when the alarm means is actuated to switch off the engine after a preset time interval.
1 8. A mineral oil-contaminant separator for location in a mineral oil flow line, which separator includes at least one device accord ing to any one of claims 1 to 17.
19. A device according to any one of claims 1 to 18. substantially as hereinbefore described with reference to Fig. 1, Figs. 2 and 3, Fig. 4 or Fig. 5 of the accompanying drawings.
GB8037380A 1979-11-23 1980-11-21 Automatic level control system for an oil contaminant Expired GB2065336B (en)

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GB8037380A GB2065336B (en) 1979-11-23 1980-11-21 Automatic level control system for an oil contaminant

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GB2065336B GB2065336B (en) 1983-12-07

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EP0084405A1 (en) * 1982-01-07 1983-07-27 Agar Corporation Ltd. Device for detecting or controlling an interface between two liquids
EP0106737A2 (en) * 1982-09-22 1984-04-25 Fram Corporation Probe and drain assembly
GB2137349A (en) * 1983-03-28 1984-10-03 Elvio Bernardi Discharge valve controlled by liquid level sensor
GB2146253A (en) * 1983-09-12 1985-04-17 Haden Drysys Int Ltd A separation system including a flotation tank having level control means
EP0150120A2 (en) * 1984-01-23 1985-07-31 Davco Manufacturing Corporation Drain system for fuel processor apparatus
US4595341A (en) * 1983-07-06 1986-06-17 Rolls-Royce Motors Limited Fluid supply apparatus including plural reservoirs and condition responsive control of pump drive motor by contaminant sensing probes
FR2629876A1 (en) * 1988-04-11 1989-10-13 Labinal Devices for removing water from diesel fueling a diesel engine
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WO2001094773A1 (en) * 2000-06-05 2001-12-13 Ufi Universal Filter International S.P.A. Apparatus for automatically draining water accumulated in a fuel filter of a vehicle, particularly for diesel engines
EP1180666A1 (en) * 2000-08-11 2002-02-20 Kia Motors Corporation Structure for installing a fuel level sensor in a fuel tank for automobiles
EP1241129A1 (en) * 2001-03-12 2002-09-18 Salvatore Italiano Draining device for fuel tank sumps
US6645372B2 (en) 2000-06-05 2003-11-11 Ufi Universal Filter International S.P.A Unit for draining water from a fuel filter
EP1512451A1 (en) * 2003-09-04 2005-03-09 Michail Fachidis Water warning system in fuel of petrol and diesel internal combustion engines
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US7368060B2 (en) 2005-01-14 2008-05-06 Warning Sa Apparatuses and methods for detecting contaminant in a fuel system
FR2922302A1 (en) * 2007-10-15 2009-04-17 Cartier Technologies Soc Par A SENSOR FOR PRESENCE OF LIQUID IN A CONTAINER AND DEVICE PROVIDED WITH SUCH SENSOR
EP2279090A1 (en) * 2008-03-31 2011-02-02 Scania CV AB Device for detecting and removing water in a fuel tank
GB2440914B (en) * 2006-08-17 2011-02-09 Parker Hannifin Corp A water draining system for a fuel filter
CN102305161A (en) * 2011-09-30 2012-01-04 三一重工股份有限公司 Medium storage device and impurity discharging system thereof
CN102953882A (en) * 2011-08-17 2013-03-06 罗伯特·博世有限公司 Filter device for filtering particles contained in fuel of diesel engine for use in motor vehicle, has filter medium with drainer that is coupled to housing by latching connection, for discharging filtered water from filter device
US8409446B2 (en) 2009-08-21 2013-04-02 Cummins Filtration Ip, Inc. Automatic draining system to drain fluid from a filter
CN109184977A (en) * 2018-08-27 2019-01-11 潍柴动力股份有限公司 Auto-drainage cup, drainage system and water discharge method for fuel filter
US10406465B2 (en) 2016-04-29 2019-09-10 Mann+Hummel Gmbh Drain control device for a filter system as well as filter system with a drain control device
US10406464B2 (en) 2016-04-29 2019-09-10 Mann+Hummel Gmbh Drain control device for a filter system as well as filter system with a drain control device
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US10969802B2 (en) * 2017-10-03 2021-04-06 Rotex Automation Limited Solenoid operated unit for detecting and removing undesired fluid with diagnostic metering
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EP0084405A1 (en) * 1982-01-07 1983-07-27 Agar Corporation Ltd. Device for detecting or controlling an interface between two liquids
EP0106737A2 (en) * 1982-09-22 1984-04-25 Fram Corporation Probe and drain assembly
EP0106737A3 (en) * 1982-09-22 1986-08-27 Fram Corporation Probe and drain assembly
GB2137349A (en) * 1983-03-28 1984-10-03 Elvio Bernardi Discharge valve controlled by liquid level sensor
US4595341A (en) * 1983-07-06 1986-06-17 Rolls-Royce Motors Limited Fluid supply apparatus including plural reservoirs and condition responsive control of pump drive motor by contaminant sensing probes
GB2146253A (en) * 1983-09-12 1985-04-17 Haden Drysys Int Ltd A separation system including a flotation tank having level control means
EP0150120A2 (en) * 1984-01-23 1985-07-31 Davco Manufacturing Corporation Drain system for fuel processor apparatus
EP0150120A3 (en) * 1984-01-23 1985-12-04 Davco Manufacturing Corporation Drain system for fuel processor apparatus
EP0337861A1 (en) * 1988-04-11 1989-10-18 Labinal Device for removing water from gasoil for a diesel engine
FR2629876A1 (en) * 1988-04-11 1989-10-13 Labinal Devices for removing water from diesel fueling a diesel engine
GB2231961A (en) * 1989-05-18 1990-11-28 Peng Wen Bing Liquid level sensing circuit
GB2248948A (en) * 1990-10-19 1992-04-22 Stephen Groves Electron 10 pump activator
GB2279020A (en) * 1993-06-17 1994-12-21 Marral Chemicals Ltd Separator
GB2279020B (en) * 1993-06-17 1995-10-18 Marral Chemicals Ltd Dry cleaning fluid separation
US6783665B1 (en) 1999-10-03 2004-08-31 Ufi Universal Filter International S.P.A. Unit for automatically bleeding off the water which separates in a vehicle fuel filter, in particular for diesel engines
WO2001033069A1 (en) * 1999-11-03 2001-05-10 Ufi Universal Filter International S.P.A. Unit for automatically bleeding off the water which separates in a vehicle fuel filter, in particular for diesel engines
KR100699468B1 (en) * 1999-11-03 2007-03-26 유에프아이 필터즈 소시에떼 퍼 아찌오니 Unit for automatically bleeding off the water which separates in a vehicle fuel filter, in particular for diesel engines
CN100392235C (en) * 2000-06-05 2008-06-04 Ufi万能过滤器国际股份公司 Appts. for automatically draining water accumulated in fuel. filter of vehicle, particularly for diesel engine
US6645372B2 (en) 2000-06-05 2003-11-11 Ufi Universal Filter International S.P.A Unit for draining water from a fuel filter
JP2003536017A (en) * 2000-06-05 2003-12-02 ユーエフアイ ユニバーサル フイルター インターナシヨナル ソチエタ ペル アチオーニ Improved unit that automatically bleeds off water stored in vehicle fuel filters typically for diesel engines
WO2001094773A1 (en) * 2000-06-05 2001-12-13 Ufi Universal Filter International S.P.A. Apparatus for automatically draining water accumulated in a fuel filter of a vehicle, particularly for diesel engines
KR100741001B1 (en) 2000-06-05 2007-07-20 유에프아이 필터즈 소시에떼 퍼 아찌오니 Improved Unit for Automatically Bleeding Off the Water Accumulated in a Vehicle Fuel Filter, Typically for Diesel Engines
EP1180666A1 (en) * 2000-08-11 2002-02-20 Kia Motors Corporation Structure for installing a fuel level sensor in a fuel tank for automobiles
EP1241129A1 (en) * 2001-03-12 2002-09-18 Salvatore Italiano Draining device for fuel tank sumps
EP1540167A1 (en) * 2002-07-04 2005-06-15 Water-D-Tech Global Limited A marine fuel supply system and a marine craft including same
EP1512451A1 (en) * 2003-09-04 2005-03-09 Michail Fachidis Water warning system in fuel of petrol and diesel internal combustion engines
EP1642632A1 (en) * 2004-10-04 2006-04-05 Mann+Hummel Gmbh Liquid filter
US7368060B2 (en) 2005-01-14 2008-05-06 Warning Sa Apparatuses and methods for detecting contaminant in a fuel system
GB2440914B (en) * 2006-08-17 2011-02-09 Parker Hannifin Corp A water draining system for a fuel filter
FR2922302A1 (en) * 2007-10-15 2009-04-17 Cartier Technologies Soc Par A SENSOR FOR PRESENCE OF LIQUID IN A CONTAINER AND DEVICE PROVIDED WITH SUCH SENSOR
EP2051049A1 (en) * 2007-10-15 2009-04-22 G. Cartier Technologies Sensor for the presence of liquid in a container and device equipped with such a sensor
EP2279090A1 (en) * 2008-03-31 2011-02-02 Scania CV AB Device for detecting and removing water in a fuel tank
EP2279090A4 (en) * 2008-03-31 2011-05-04 Scania Cv Ab Device for detecting and removing water in a fuel tank
US8409446B2 (en) 2009-08-21 2013-04-02 Cummins Filtration Ip, Inc. Automatic draining system to drain fluid from a filter
DE112011101496B4 (en) * 2010-04-27 2021-05-06 Cummins Filtration Ip, Inc. Filter system for a fuel filtration device
CN102953882A (en) * 2011-08-17 2013-03-06 罗伯特·博世有限公司 Filter device for filtering particles contained in fuel of diesel engine for use in motor vehicle, has filter medium with drainer that is coupled to housing by latching connection, for discharging filtered water from filter device
CN102305161A (en) * 2011-09-30 2012-01-04 三一重工股份有限公司 Medium storage device and impurity discharging system thereof
CN111779604A (en) * 2015-08-17 2020-10-16 康明斯过滤Ip公司 Automatic drain system for vacuum side and pressure side oil water separators
US10406465B2 (en) 2016-04-29 2019-09-10 Mann+Hummel Gmbh Drain control device for a filter system as well as filter system with a drain control device
US10406464B2 (en) 2016-04-29 2019-09-10 Mann+Hummel Gmbh Drain control device for a filter system as well as filter system with a drain control device
US10969802B2 (en) * 2017-10-03 2021-04-06 Rotex Automation Limited Solenoid operated unit for detecting and removing undesired fluid with diagnostic metering
CN109184977A (en) * 2018-08-27 2019-01-11 潍柴动力股份有限公司 Auto-drainage cup, drainage system and water discharge method for fuel filter

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