EP0713568A1 - Dispositif de securite pour arreter un ecoulement en cas de trop-plein - Google Patents

Dispositif de securite pour arreter un ecoulement en cas de trop-plein

Info

Publication number
EP0713568A1
EP0713568A1 EP94922202A EP94922202A EP0713568A1 EP 0713568 A1 EP0713568 A1 EP 0713568A1 EP 94922202 A EP94922202 A EP 94922202A EP 94922202 A EP94922202 A EP 94922202A EP 0713568 A1 EP0713568 A1 EP 0713568A1
Authority
EP
European Patent Office
Prior art keywords
fluid flow
safety device
flow safety
sensor chamber
chamber
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.)
Withdrawn
Application number
EP94922202A
Other languages
German (de)
English (en)
Other versions
EP0713568A4 (fr
Inventor
Trevor Thomas Esplin
Walter Morrison
Jean Morrison
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
Priority claimed from AUPM6748A external-priority patent/AUPM674894A0/en
Application filed by Individual filed Critical Individual
Publication of EP0713568A1 publication Critical patent/EP0713568A1/fr
Publication of EP0713568A4 publication Critical patent/EP0713568A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
    • F17C13/123—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures for gas bottles, cylinders or reservoirs for tank vehicles or for railway tank wagons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/20—Excess-flow valves
    • F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
    • F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
    • F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
    • F16K17/285—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only the cutting-off member being a ball
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0332—Safety valves or pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0382—Constructional details of valves, regulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/035—Propane butane, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL

Definitions

  • This invention relates to the provision of a user friendly, inexpensive and simplified excess-flow safety shut-off device for the control of hazardous, expensive or precious fluids. While this invention was originally developed to provide additional protection for LP gas users, it has wider applications than that of just gas cylinder operations. For simplicity however, it will be described with reference to LP gas applications in this text.
  • This safety device particularly addresses the requirement to contain flammable gases in the cylinder when a variety of potentially hazardous situations occur. For particular applications, it also helps ensure the correct orientation of the gas cylinder so that only fuel in its gaseous state can proceed from the cylinder and through the device.
  • LP gas is an efficient, effective and economical fuel source which, when treated correctly, is completely safe.
  • time, wear and tear, customer misuse and equipment failures can produce a variety of unsafe operational conditions which this invention specifically seeks to address.
  • Previous devices which include gas pressure gauges often cause operators to believe that they now have an indication of the gas contents of the cylinder when, in fact, all they have is an indication of the actual gas pressure of the supply line at that moment.
  • LP gas converts from its liquid to its gaseous state, it expands some two hundred and seventy times in volume.
  • Boyle's Law can be used to help show the ratio of gas to fluid and the pressure at various temperatures. Therefore, a very small quantity of fluid LP gas within the cylinder can register a pressure of around one hundred pounds per square inch, which is within the bounds of the normal supply pressure and which is the reading that a full cylinder will register, even though the cylinder is almost empty.
  • Some of the previous devices do not shut-off if the gas cylinder falls onto its side or, if a less than half full cylinder is being operated while lying on its side.
  • the orientation of the gas cylinder should effect the shut-off device as, in some instances, this is the only method of detecting that an unsafe condition exists and prevents it from then becoming life threatening.
  • a mantle lantern mounted onto a small portable gas cylinder in a camping type situation should not remain operational when lying on its side.
  • Another problem which inflicts many of the previous inventions is that they are inconsistent with regard to their maximum flow rates. These flow rates should be at their maximum when the cylinder is in its correct orientation and must then decrease as the cylinder deviates from that orientation regardless through which axes the deviation is occurring.
  • Many of the previous inventions are sensitive to one style of deviation and tests have shown that, instead of registering reduced fluid flows when placed in these positions, they actually register substantially increased flows.
  • a fluid flow safety device comprising; a body, having an inlet for connection to a fluid supply, an inlet passageway leading to a selective fluid flow sensor chamber, and located at the outlet end of the said sensor chamber is a sealing means which encircles an outlet orifice and this outlet orifice is of smaller cross section than that of the sensor chamber, said outlet orifice leading from the sensor chamber into a pressure chamber within the body; a movable piston which makes a sliding and sealing contact with the pressure chamber, and whose sliding movement from a rest position increases or decreases the volume of the said pressure chamber and a plunger is incorporated into the base of the movable piston and an indicator mark on the movable piston is visible when the pressure in the pressure chamber is above a predetermined valve; a passageway extending from the pressure chamber to an outlet aperture which is connectable to further fluid
  • a fluid flow safety device comprising; a body, with an inlet assembly containing a fluid passageway which provides a mating connection to form a fluid tight seal between the body inlet orifice and is connectable to a fluid supply source and, has an inlet passageway leading to a selective fluid flow sensor chamber, and located at the outlet end of the said sensor chamber is a sealing means which encircles an outlet orifice and this outlet orifice is of smaller cross section than, that of the sensor chamber, said outlet orifice leading from the sensor chamber into a pressure chamber within the body; a guide for the movable piston is located onto the body to form part of the pressure chamber and has i s axis is aligned to the axis of the outlet orifice; a movable piston which makes a sliding and sealing contact with the guide, and whose sliding movement increases or decreases the volume of the pressure chamber and a plunger is incorporated into the base of the movable piston and an indicator mark on the movable piston
  • a fluid flow safety device comprising; an inlet assembly with a fluid passageway for connection to a fluid supply, a body having an inlet passageway leading to a selective fluid flow sensor chamber, and located at the outlet end of the of the said sensor chamber is a sealing means which encircles an outlet orifice and this outlet orifice is of smaller cross section than that of the sensor chamber, said outlet orifice leading from the sensor chamber to a pressure chamber within the body; a movable piston which makes a sliding and sealing contact within the pressure chamber, and whose central axis is aligned with the central axis of the sensor chamber and the opposite end of the movable piston to that which is located within the bounds of the sliding and sealing contact of the pressure chamber, experiences the effect of atmospheric pressure; a passageway extending from the pressure chamber to an outlet aperture which is connectable to further fluid transport mechanisms; a movable plug which is positioned within the selective fluid flow sensor chamber and is located between the inlet passageway and the outlet orifice, and
  • a fluid flow safety device comprising; a body having an inlet end for connection to a fluid supply and an outlet end for connection to further fluid transport mechanisms, an inlet passageway leading to a valve orifice passageway which leads to a primary valve seat and primary valve pressure chamber which connects via the outlet passageway to the outlet end; a primary valve mechanism is located within the primary valve pressure chamber such that it can form a fluid tight seal between the inlet and the outlet passageways by engaging with the primary valve seat; a selective fluid flow sensor chamber and located at the outlet end of the said sensor chamber is a sealing means which encircles an outlet orifice and this outlet orifice is of smaller cross section than that of the sensor chamber said outlet orifice leading from the sensor chamber to the valve orifice; a sensor chamber shield which encircles the sensor chamber by forming, defining and separating the internal length of the sensor chamber passageway from that of the inlet or any other passageway; a movable plug which is positioned within the fluid flow sensor chamber and can
  • a fluid flow safety shut-off mechanism comprising; an attaching guide housing which is connectable with a fluid flow safety device body, said attaching guide housing containing a central guide hole and a mating connection for a spindle mechanism; a movable piston which makes a sealing and sliding contact within the central guide hole in the attaching guide housing, said movable piston containing a cylindrical chamber and a valve plug; a reset plunger pin, one end of which makes a sliding, sealing contact within the cylindrical chamber while the other end is located within an oversized orifice in the centre of the valve plug; a spindle mechanism which makes a mating connection with the attaching guide housing and which, when rotated towards its closed position, urges the movable piston from the attaching guide housing and the said spindle contains a central guide hole which extends longitudinally through its central axis; a handle which combines with the spindle to transmit the rotational movement to the spindle; a reset shaft which, when moved to its reset position, engage
  • figure 1 shows the operational and pressurized condition of one version of the vertical presentation of the fluid flow safety device while
  • figure 2 shows the shut-off condition of the same vertical version while
  • figure 3 shows the reset condition of the same vertical version while
  • figure 4 shows the operational and pressurized condition of one version of the horizontal presentation of the fluid flow safety device while
  • figure 5 shows the shut-off condition of the activation components of the same horizontal version while
  • figure 6 shows the reset condition of the activation components of the same horizontal version while
  • figure 7 shows the operational and pressurized condition of the version of the fluid flow safety device for mounting directly into the main outlet of the gas cylinder while
  • figure 8 shows the rest position of the fluid flow safety shut-off mechanism while
  • figure 9 shows the reset position of the fluid flow safety shut-off mechanism while
  • figure 10 shows the pressurized position of the fluid flow safety shut-off mechanism.
  • FIG. 1 a vertical version of a fluid flow safety device 1 which is connectable to a gas cylinder (not shown) at the inlet end 2 of the body 3.
  • the inlet assembly 4 is separate from, and connectable to the body 3.
  • the 0-ring 5 provides a fluid tight seal between the two components.
  • the upper periphery 6 of the inlet assembly is crimped into the groove 7 located on the lower portion of the body.
  • an inlet passageway 8 Contained within the inlet assembly is an inlet passageway 8 which leads to a selective fluid flow sensor chamber 9 and a sealing means 10 which encircles the outlet orifice 11 of the sensor chamber which leads to a pressure chamber 12 within the body.
  • the sealing means is shown as an 0-ring which is held in place with a removable tapered sensor chamber passageway 13.
  • a inlet passageway end stop 14 is firmly inserted into the end of the inlet passageway and, as it is highly resistant to being removed, renders the sensor chamber tamper proof.
  • the inlet passageway end stop also locates the removable sensor chamber passageway in its correct position.
  • the sealing means can also be a radius which matches the movable plug and can be machined into the end of the sensor chamber and the cylindrical walls of the sensor chamber can then be formed to resemble the profile of the internal passageway as shown by the removable tapered sensor chamber passageway.
  • the inlet passageway end stop can have a tapered outlet 15 which combines with the movable plug 16 to provide a one way valve.
  • the inlet passageway, end stop can contain a filtering material within its passageway to help ensure that foreign material is excluded from the sensor chamber.
  • the positioning of the movable plug within the sensor chamber herein defined by a larger diameter 17, a tapered section 18 and a smaller diameter 19 enhances the effects of Bernoulli's theorem on the movable plug in that as the movable plug is drawn towards the outlet orifice by the flow of the fluid, as the movable plug approaches the outlet orifice the pressure increases until the seal with the sealing means is achieved.
  • the tapered section allows for a much lower flow rate to move the movable plug to the sealing means when the unit is in a horizontal alignment. Thus, if the unit falls onto its side, it is very responsive to a quick shut-off.
  • movable piston 20 Within the pressure chamber of the body is movable piston 20 which has two circlip grooves 21 and 22, a passageway 23 and an extension 24 at the outlet end for connection to further fluid transport mechanisms. Between the two circlips 25 and 26 are two spacer rings 27 and 28 and between them are two 0-rings 29 and 30 and a shim 31. While two 0-rings are not essential, many of the regulatory authorities require a double seal between a pressure chamber and atmosphere. Between the circlip 26 and the further fluid transport mechanism is a spacing ring stop 32, a spring 33 and an inverted spacing ring stop 34. Within the step in the chamber walls 35 of the body is a circular internal push-on fastener 36 which, when in place, renders the top end of the unit virtually tamper proof.
  • the inverted spacing ring stop and the internal push-on fastener could be replaced by a groove in the pressure chamber walls and a compression clip ring.
  • a groove 37 in the extension of the movable piston which contains a indicator mark 38 which could be a green neoprene 0-ring.
  • a plunger 39 mounted onto the base of the movable piston is a plunger 39 which has a passageway 40 which allows fluids to flow between the pressure chamber and the passageway 23. At the narrow passage 41 can be installed a one way valve should the need arise.
  • the fluid flow safety device is shown in the condition that it will be in when it is passing pressurized fluid at a rate below the maximum predetermined flow rate for that unit.
  • the movable plug is near the base of the sensor chamber and the pressure in the pressure chamber forces the movable piston into the position shown and the volume of the pressure chamber increases to its maximum. This is achieved by 0-ring 29 pressing the shim 31 onto the 0-ring 30 which presses the spacer ring 28 which presses the circlip 26 onto the spacing ring stop 32 whose limit of travel is reached when the spring 33 is fully compressed against the inverted spacing ring stop 34 which is resting upon the circular internal push-on fastener 36.
  • the fluid flow safety device is shown in the condition that it will be in when an emergency shut-off has occurred.
  • the movable plug 16 has been forced onto the sealing means 10 at the end of the sensor chamber 9 at the outlet orifice end.
  • the circular internal push-on fastener 36 which is immovable within the chamber walls of the body, is anchoring the inverted spacing ring stop 34 which has the upper end of the spring 33 pressing against it.
  • the other end of the spring has forced the spacing ring stop 32 to come to rest against the step in the bore of the pressure chamber 42.
  • the action of the still tensioned spring which is held between the circular internal push-on fastener and the step in the bore of the pressure chamber holds the movable piston between the inverted spacing ring stop pressing against the movable piston's extension at 43 and the spacing ring stop pressing onto the circlip 27.
  • the plunger 39 does not touch the movable plug.
  • the indicator mark 38 is no longer visible and the volume of the pressure chamber returns to its rest volume.
  • the fluid flow safety device is shown in the condition that it will be in when it is being reset.
  • the reset occurs when an external force moves the movable piston into the position as shown.
  • the extension of the movable piston at 43 moves the inverted spacing ring stop 34 away from the circular internal push-on fastener 36 and compresses the spring 33 against the spacing ring stop 32 which can not move as it is held in place by the step in the bore of the pressure chamber 42. While held in this position, the volume of the pressure chamber decreases to, or near, its minimum.
  • the plunger 39 has moved the movable plug 16 away from the sealing means 10 and this action allows the pressure chamber to become pressurized and, providing a sufficient pressure is obtained, returns the device to the condition as shown in figure 1.
  • FIG. 4 there is shown a horizontal version of a fluid flow safety device 44 which is connectable to a gas cylinder (not shown) at the inlet assembly 45 which, in this case has a POL type mating connection, and connects with the body 46.
  • the inlet assembly 45 is separate from, and connectable to the body. As this version is not intended to be taken apart, an industrial adhesive is used to bond the inlet assembly to the body.
  • an inlet passageway 48 Contained within the inlet assembly is an inlet passageway 48 which leads to a selective fluid flow sensor chamber 49 and a sealing means 50 which encircles the outlet orifice 51 of the sensor chamber which leads to a pressure chamber.52 within the body.
  • the sealing means is shown as an 0-ring which is held in place with a removable tapered sensor chamber passageway 53.
  • a inlet passageway end stop 47 is pin which is firmly inserted into the body.
  • the inlet assembly can contain a filtering material within its passageway to help ensure that foreign material is excluded from the sensor chamber.
  • the positioning of the movable plug 56 within the sensor chamber herein defined by a larger diameter 57, a tapered section 58 and a smaller diameter 59 enhances the effects of Bernoulli's theorem on the movable plug in that as the movable plug is drawn towards the outlet orifice by the flow of the fluid, as the movable plug approaches the outlet orifice the pressure increases until the seal with the sealing means is achieved.
  • the tapered section allows for a much lower flow rate to move the movable plug to the sealing means when the orientation of the sensor chamber is in a horizontal alignment. Thus, if the unit falls * onto its side, it is very responsive to a quick shut-off.
  • the tapered sensor chamber passageway 53 is removable from the body.
  • an 0-ring 54 surrounds the tapered sensor chamber passageway and forms a seal between the body and the removable outlet orifice 55 of the sensor chamber.
  • the removable outlet orifice passageway holds the tapered sensor chamber in place and, in turn, it is held in place by the vented plug 201 which connects with the guide 202 which attaches to the body.
  • a passageway 203 leads to the outlet end for connection to further fluid transport mechanisms.
  • the guide forms part of the pressure chamber and, within the guide hole 206, resides the movable piston 60 which has a circlip groove 61 and a circlip 65 located ' at its lower end.
  • An angled stop 64, a spring 63 and spacer ring 204 are located between the circlip and the step in the piston at 205.
  • the angled stop is able to travel between the vented plug and the step in the guide hole's chamber walls at 208.
  • a groove 67 in the extension of the movable piston which contains a indicator mark 88 which could be a green neoprene 0-ring.
  • a plunger 69 which is of smaller diameter that of the outlet orifice from the sensor chamber.
  • the guide uses the 0-ring 209 to help ensure a fluid tight seal between itself and the body while the two grooves on the movable piston accommodate the two 0-rings 210 and 211.
  • the pin 47 is removed and is replaced with a shut-off shaft and triggering mechanism whose axes are aligned, with the sensor chamber to a common datum.
  • the shaft will locate the movable plug in the position as shown in figure 4.
  • the triggering mechanism holding the shut-off shaft releases, the movable plug is forced, by the shut-off shaft, to form a seal with the sealing means.
  • the reset action of the movable piston will not only cause the pin to unseat the movable plug, but will travel sufficiently far to cause the shut-off shaft trigger to re-latch into its armed state.
  • the fluid flow safety device is shown in the condition that it will be in when it is passing pressurized fluid at a rate below the maximum predetermined flow rate for that unit.
  • the movable plug is near the base of the sensor chamber and the pressure in the pressure chamber forces the .movable piston into the position shown and the volume of the pressure chamber increases to its maximum.
  • the upward travel of the movable piston is limited by the circlip 65 pressing against the angled stop 64 which has engaged the step in the guide hole's chamber walls at 208. If the pressure in the pressure chamber drops below a predetermined value, the tension in the spring 63 returns the movable piston to its rest position.
  • the pin 47 is removed and a shaft mechanism is installed at point 199.
  • This shaft mechanism is axially aligned with the axis of the sensor chamber and when in it is held open by the triggering system, positions the movable plug in the location as shown in this figure.
  • the shaft mechanism forces the movable plug to form a seal with the sealing means thereby terminating the fluid flow.
  • the fluid flow safety device is shown in the condition that it will be in when an emergency shut-off has occurred.
  • the movable plug 56 has been forced onto the sealing means 50 at the outlet orifice end of the sensor chamber 49.
  • the indicator mark 88 is not visible and the volume of the pressure chamber returns to its rest volume.
  • the fluid flow safety device has been mounted into a modified form of the standard type of on/off valve which is currently marketed on LP gas cylinders.
  • the body 101 has the standard features which include an attaching means 102 for connecting the valve body to the cylinder (not shown) which normally consist of a tapered thread.
  • An inlet passageway 103 which leads to a safety valve mechanism 104 through a safety valve passageway 105, a primary valve seat 106, a primary valve 107, an outlet passageway 108 and an outlet aperture 109 for connection to further fluid transport mechanisms.
  • An 80% decanting bleed tube 110 and bleed valve 111 are provided to aid the cylinder filling process.
  • a valve mechanism including a handle 112, a spindle 113 and an attaching guide housing 114 are standard features. Many of the above mentioned features are covered by mandatory requirements and it was therefore essential that the current invention made no attempt to interfere with, or modify the operation or integrity of any of these features.
  • This design has no critical tilt angles. Any deviation from the vertical in any direction will cause the maximum flow rate to diminish. Also, the positioning of the movable plug into its rest position by the aid of three fingers, provides a stable platform for the refilling process in that there is minimal pressure loss as the movable plug remains stationary during this procedure.
  • the pin 121 in the centre of the valve plug will not allow a seal to form between the movable plug and the sealing means.
  • the primary valve mechanism starts to open a small quantity of gas would be allowed to escape. This discharge is sufficient to pressurize the gas lines, or, if the main outlet is venting to the atmosphere, a further opening of the valve quickly causes the movable plug to terminate the fluid flow.
  • the termination should occur within the first twenty degrees of rotation of the spindle when venting to the atmosphere. Also, with this design, it is possible to unscrew and remove the primary valve mechanism from the body regardless of the contents of the gas cylinder.
  • a fluid flow safety shut-off mechanism is detailed. It is intended as a special upgrade for the cylinder type fluid flow safety device herein previously described. This unit is intended to be either a factory fit option or an upgrade kit for the after fit market. It provides an indicator and reset mechanism similar to those described in the figures 1 to 6.
  • the attaching guide housing 122 screws into the body of the fluid flow safety device described in figure 7.
  • a spindle 123 makes a threaded connection with the attaching guide housing and has a handle 124 located at the outer end and held in place with the aid of an indicator nut 125. Within the spindle is a spindle guide hole which contained a reset shaft 126. Screwed onto the outer end of the reset shaft is an extension 127 which includes an indicator mark 128.
  • a movable piston which contains within it a cylindrical chamber 132. Making a sliding and sealing contact within that cylindrical chamber is a reset plunger pin 133. Sealing the lower end of the cylindrical chamber is a valve plug 134. The orifice where the reset plunger pin passes through the valve plug is slightly oversized to allow pressurizing of the cylindrical chamber to occur. If the mechanism as detailed within figure 8 were installed in a valve body, it would show the condition of an emergency shut-off. The pressure in the pressure chamber has the movable piston touching the spindle, the reset plunger pin is touching the reset shaft, the spindle is in an open position and the indicator mark is not visible.
  • a fluid flow safety shut-off mechanism is detailed in the reset position.
  • the spindle 123 has been rotated to a near closed position and has moved the movable piston 131 to the lower end of the attaching guide housing 122.
  • the spring 130 compresses and the reset plunger pin extends itself through the valve plug 134. In this state, the reset plunger pin will deny seal to occur between the movable lug and the sealing means.
  • a fluid flow safety shut-off mechanism is detailed in its armed position.
  • the spindle 123 has been rotated within the attaching guide housing 122 to an open position.
  • the pressure in the pressure chamber has forced the movable piston 131 into the attaching guide housing and into contact with the spindle.
  • the pressure within the cylindrical chamber has forced the reset plunger pin 133 into its fully retracted position and has forced the reset shaft 126 to compress the spring 129 and, the extension 127 is positioned so that the indicator mark 128 is visible.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)
  • Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)

Abstract

L'invention se rapporte à un dispositif de sécurité pour écoulement fluide, qui comprend un logement ayant une extrémité d'entrée destinée à être connectée à une source de fluide ainsi qu'à un conduit d'entrée (8, 48, 103) qui mène à une chambre à capteur d'écoulement fluide sélectif (9, 49, 115). A l'extrémité de sortie de ladite chambre à capteur est situé un organe d'étanchéité (10, 50) qui entoure l'orifice de sortie (11, 51), lequel a une section transversale plus petite que la chambre à capteur, ledit orifice de sortie allant de la chambre à capteur jusqu'à une chambre sous pression (12, 52) à l'intérieur du logement. Entre l'extrémité d'entrée de la chambre à capteur et l'organe d'étanchéité est située une section conique (13, 117), au niveau de laquelle le passage de la chambre à capteur décroît en diamètre au fur et à mesure qu'il se rapproche de l'organe d'étanchéité. La chambre à capteur peut être entourée d'un écran de chambre à capteur (120) formant, définissant et séparant la longueur interne du conduit de la chambre à capteur du conduit de celle du conduit d'entrée ou autre. Une bille (16, 56, 119) dans la chambre à capteur se déplace entre l'extrémité du conduit d'entrée de la chambre à capteur et l'orifice de sortie de manière à former une obturation avec l'organe d'étanchéité lorsque le débit dans la chambre à capteur dépasse une valeur prédéterminée. Dans la chambre à capteur se trouve un piston mobile (20, 60, 131) en contact étanche avec ladite chambre et conçu pour augmenter ou diminuer le volume de ladite chambre sous pression. Le mouvement du piston mobile à partir d'une position de repos jusqu'à une position complétement dirigée vers la chambre à capteur empêche toute obturation entre la bille et l'organe d'étanchéité. Le piston mobile peut être un mécanisme à valve primaire qui forme une obturation entre les conduits d'entrée et de sortie. De plus, il peut porter un repère qui est visible uniquement lorsque la pression dans la chambre sous pression dépasse une valeur prédéterminée. Dans un mode de réalisation pour le GPL, la chambre à capteur ou le piston mobile sont utilisés séparément avec ou sans valve primaire.
EP94922202A 1993-08-09 1994-08-08 Dispositif de securite pour arreter un ecoulement en cas de trop-plein Withdrawn EP0713568A4 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
AUPM0043/29 1993-08-09
AUPM043293 1993-08-09
AUPM6748A AUPM674894A0 (en) 1994-07-12 1994-07-12 An excess flow safety shut-off device
AUPM0674/89 1994-07-12
PCT/AU1994/000453 WO1995005554A2 (fr) 1993-08-09 1994-08-08 Dispositif de securite pour arreter un ecoulement en cas de trop-plein

Publications (2)

Publication Number Publication Date
EP0713568A1 true EP0713568A1 (fr) 1996-05-29
EP0713568A4 EP0713568A4 (fr) 1998-09-30

Family

ID=25644516

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94922202A Withdrawn EP0713568A4 (fr) 1993-08-09 1994-08-08 Dispositif de securite pour arreter un ecoulement en cas de trop-plein

Country Status (3)

Country Link
EP (1) EP0713568A4 (fr)
CA (1) CA2169192A1 (fr)
WO (1) WO1995005554A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2754872B1 (fr) * 1996-10-21 1998-12-24 Briffault Sa Conduit constitue de deux troncons susceptibles de se deplacer l'un par rapport a l'autre et rearmant une securite interne
CN107606240A (zh) * 2017-10-20 2018-01-19 新乡市华航航空液压设备有限公司 一种高精度稳压组合阀
US10746406B2 (en) * 2018-09-18 2020-08-18 Georg Fischer Central Plastics Llc Breaker box assembly

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU568958B2 (en) * 1984-02-02 1988-01-14 Sung, Show Yen Safety gas valve
EP0172935A1 (fr) * 1984-08-30 1986-03-05 Ruey Feng Fang Régulateur de débit du gaz de sûreté
GB2184207A (en) * 1985-12-12 1987-06-17 Tsai Tzung Ta Safety valve
EP0292486B1 (fr) * 1986-01-24 1994-04-06 Premier-Fosters (Australia) Limited Dispositif d'arret automatique pour fluides

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No further relevant documents disclosed *
See also references of WO9505554A2 *

Also Published As

Publication number Publication date
WO1995005554A3 (fr) 1995-03-23
CA2169192A1 (fr) 1995-02-23
EP0713568A4 (fr) 1998-09-30
WO1995005554A2 (fr) 1995-02-23

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