WO2015070878A1 - Vanne de régulation de pression et de débit - Google Patents

Vanne de régulation de pression et de débit Download PDF

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Publication number
WO2015070878A1
WO2015070878A1 PCT/DK2014/050388 DK2014050388W WO2015070878A1 WO 2015070878 A1 WO2015070878 A1 WO 2015070878A1 DK 2014050388 W DK2014050388 W DK 2014050388W WO 2015070878 A1 WO2015070878 A1 WO 2015070878A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
flow
outlet
control valve
control
Prior art date
Application number
PCT/DK2014/050388
Other languages
English (en)
Inventor
Thyge Rahbæk DUEHOLM
Original Assignee
Müller Gas Equipment A/S
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Müller Gas Equipment A/S filed Critical Müller Gas Equipment A/S
Publication of WO2015070878A1 publication Critical patent/WO2015070878A1/fr

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/04—Control of fluid pressure without auxiliary power
    • G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
    • G05D16/063—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane
    • G05D16/0644—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator
    • G05D16/0655—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator using one spring-loaded membrane
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/04—Control of fluid pressure without auxiliary power
    • G05D16/0402—Control of fluid pressure without auxiliary power with two or more controllers mounted in series
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • G05D7/01—Control of flow without auxiliary power
    • G05D7/0186—Control of flow without auxiliary power without moving parts

Definitions

  • the present invention concerns a pressure and flow control valve for use in connection with stepwise regulation of a flow
  • the control valve in addition to a connection for a pressure source also includes at least a pressure outlet and a flow outlet, wherein between the connection for a pressure source and the pressure outlet there is arranged at least one first pressure control step for regulating a gas pressure from a first level to a second, lower level, the control valve further including at least one second pressure control step for regulating a gas pressure from one level to a third, lower level, the second pressure control step arranged between the pressure source/connection and the flow outlet.
  • control valves in connection with use of gas, including during the use of medical gases, such as e.g. oxygen, which are supplied to a user via a face piece or via tubes in the nose.
  • gases are typically stored at high pressure in a pressure container and supplied to the point of consumption or the user at a reduced pressure and in a predetermined amount which is typically measured in litres per minute (LPM).
  • LPM litres per minute
  • Such a control valve may e.g. ensure supply of gas at a pressure which does not exceed a safety limit or similar, and/or is adjusted to a given consumer situation at a point of consumption or for a consumer apparatus, and which at the same time is as constant as possible, irrespectively of fluctuations or variations in the supply pressure in dependence of the degree of filling of the pressure container.
  • the prior art types of pressure and flow reduction valves are typically made with a valve function ensuring that the pressure from the pressure container is reduced to a suitably low level, typically to a pressure between 3 and 4.5 bar, and with a flow control capability where a flow between 0 and 25 LPM can be set.
  • This regulated gas pressure is also called the discharge pressure which is conducted from the flow outlet of the control valve to a consumer.
  • the discharge pressure from a pressure and flow control vale is typically fixed, and on some pressure and flow control valves there is furthermore arranged a so-called pressure outlet which is not flow controlled, but only pressure controlled to e.g. 3, 4 or 4.5 bar, called P2.
  • the part of the gas to be used for direct supply to a patient in order to assist with the oxygen uptake or for another form of medical therapy with gas is therefore pressure and flow controlled whereas the part of the gas supplied to the pressure outlet is only pressure controlled.
  • the said pressure outlet can e.g. be used for connecting other medical equipment, such as equipment for sucking mucus and blood from the airways of a patient, for a lung ventilator or for other purposes.
  • these are typically made of a relatively thin steel or metal sheet, typically with a thickness down to 0.08 mm, though they may have a thickness of up to 2-3 tenths of a millimetre, where the apertures made for allowing correct and balanced flow are, as mentioned, rather small.
  • the said apertures are typically with a diameter between 0.06 and 0.5 mm, and the apertures are typically made in groups of two such that a faulty disposition of the handwheel and thereby of the flow disc between two steps result in that gas is still supplied to a consumer, though only in half amount.
  • the present invention concerns a pressure and flow control valve for use in connection with stepwise regulation of a flow
  • the control valve in addition to a connection for a pressure source also includes at least a pressure outlet with a pressure P2 and a flow outlet with a pressure P3, where between the connection for a pressure source and the pressure outlet there is arranged at least one first pressure control step for regulating a gas pressure PI from a first level to a second, lower level, the control valve further including at least one second pressure control step for regulating a gas pressure from one level to a third, lower level, the second pressure control step arranged between the pressure source/connection and the flow outlet.
  • the control valve in addition to a connection for a pressure source also includes at least a pressure outlet with a pressure P2 and a flow outlet with a pressure P3, where between the connection for a pressure source and the pressure outlet there is arranged at least one first pressure control step for regulating a gas pressure PI from a first level to a second, lower level, the control valve further including at least one second
  • a two-step system has only a single regulating step that separates a high pressure section from a low pressure section. If this single step fails, the full pressure of the pressure container of maybe 200 bar or 300 bar will appear directly to the patient or user.
  • a two-step system as the present one will have a higher safety level as two control steps have to fail before high pressure can be delivered to the patient or user. Both steps failing at the same time is obviously substantially less probable compared with failure of one step.
  • a higher safety level for the product is thereby also achieved by the invention. A possible high pressure to the patient or the user may cause death and very serious oxygen ignition, which is obviously unwanted.
  • This equipment can-as mentioned, e.g. be suction equipment or other instruments or equipment in hospitals, casualty wards, ambulances and the like, where this equipment is used for treating a patient that e.g. is supplied oxygen via a face piece or via a tube in the nose.
  • the pressure bottle which normally has a bottle pressure of e.g. 200 bar, already at a residual pressure of 50 bar. This is effected in order to avoid that the built-in alarm system are activated by using the flow outlet P3 as well as the pressure outlet P2 when the pressure in the control step drops from e.g. 4.5 bar to 3.6 bar.
  • Such an alarm is acoustic and is absolutely unwanted in a pressed situation as the personnel is required to attempt relieving the problem causing the alarm.
  • the need for a constant flow is i.a. present by prematurely born infants where there is a need for a constant flow of 0.05 1/min at the flow outlet, which one control step can provide for.
  • the pressure regulated in the second pressure control step for regulating a gas pressure from one level, namely P2, to a third and lower level, namely P3, will typically be regulated to a pressure of 1 bar, but higher as well as lower pressure may be applied as well.
  • the pressure difference is rather to be more than 1 bar, and preferably 2 bar or even more.
  • control valve can include flow control means including a flow disc and a spindle, the flow disc including a number of flow apertures with an internal wall and the flow disc being connected with the spindle, wherein the spindle is arranged for rotation about an axis, wherein the flow apertures by rotation of the spindle about the axis are moved relatively and brought into a position in relation to at least one discharge Opening for yielding a stepwisely determined flow through at least one flow outlet.
  • flow control means including a flow disc and a spindle, the flow disc including a number of flow apertures with an internal wall and the flow disc being connected with the spindle, wherein the spindle is arranged for rotation about an axis, wherein the flow apertures by rotation of the spindle about the axis are moved relatively and brought into a position in relation to at least one discharge Opening for yielding a stepwisely determined flow through at least one flow outlet.
  • the same pressure exists on pressure outlet and on flow outlet.
  • the flow openings or apertures are dimension such that the actual pressure and the actual cross-sectional area is adapted to the desired flow.
  • AS the pressure is relatively high by the prior art solutions, the flow apertures are relatively small.
  • the flow apertures can therefore be made correspondingly larger.
  • the flow apertures can be made markedly more exact when they are larger as a small tolerance no longer has such a great effect as when the flow apertures in the prior art solutions are very small, down to e.g. 0.06 mm in diameter.
  • the slightly larger flow apertures are both cheaper and easier to make than to produce the often very small apertures according to prior art.
  • a 100 ⁇ or finer filter is used according to a standard for protecting the control part.
  • a finer filter e.g. a 60 ⁇ filter, is rather not used as this is experienced as a resistance that will reduce the flow capacity in the control valve. This happens as the built-in dimensions available for the filter are rather modest, and the finer the applied filter, the lesser area is free for the gas to flow over. Therefore, there are good reasons for keeping a 100 ⁇ filter due to the lower resistance.
  • Such a 100 ⁇ filter allows in prin- ciple particles less than 0.1 mm to pass.
  • the control valve may include at least two pressure control steps arranged in parallel. These parallel pressure control valves thus do not have any immediate mutual influence and are therefore operating entirely independently.
  • a control valve in front of the pressure outlet in principle can be supplied with a bottle pressure PI of e.g. 200 bar which is regulated down to e.g. 4.5 bar.
  • a bottle pressure PI of e.g. 200 bar which is regulated down to e.g. 4.5 bar.
  • the same high bottle pressure of e.g. 200 bar is regulated down to a pressure of about 4.5 bar, however preferably to a pressure which is not higher than 1 bar, which is effected in pressure control step arranged before the flow outlet.
  • the said pressure examples are only to be regarded as examples, and a control valve according to the invention may readily be constructed for other pressures than those mentioned.
  • the control valve may include at least two pressure control steps arranged in series. This means that one or more control steps lower the high feed pressure PI from a bottle or other supply source to a suitable pressure P2 for the pressure outlet, whereas one or more subsequent control steps lower the pressure additionally to the desired pressure P3 in the flow control part.
  • the pressure P3 in the flow control part will typically be somewhat lower than in the pressure outlet P2, there is not the same sensitivity to consumption on the pressure outlet as e.g. 4.5 bar is available at the pressure outlet, whereas only e.g. 1 bar is to be used in the flow outlet in order that the flow fits the scale on the handwheel by which the flow is regulated - i.e. under the condition that the pressure is constant.
  • the same advantage is achieved, as the pressure can be kept very close to constant at the flow out- let, irrespective whether there is consumption on the pressure outlet or not, and at the same time the scale fits the flow regulation irrespectively of the size of the consumption on the pressure outlet.
  • a pressure and flow control valve where the flow through the flow outlet is as near constant as possible independent of whether there is a large consumption, a small consumption or not consumption at all on a pressure outlet on the control valve.
  • a control valve is indicated, where there is less risk of inadvertent clogging of flow apertures as these now can be designed with a larger cross-sectional area.
  • Fig. 1 shows a pressure and flow control valve with stepwise setting of flow and fixed pressure outlet with the pressure P2.
  • Fig. 2 shows the same pressure and flow control valve as in Fig. 1 , but here partly in section.
  • Fig. 3 shows a detail of two pressure control steps in a pressure and flow control valve.
  • Fig. 1 appears a pressure and flow control valve 1 with a valve housing 2 and a handwheel 3.
  • the actual flow for which the pressure and flow control valve 1 is set is here represented by a flow scale 4 in a cutout in the handwheel 3, and in this case the flow is set to 0 1/min.
  • the handwheel 3 is used for stepwise setting the flow of gas conducted out of the flow outlet 5 with a pressure named P3. By turning the hand- wheel 3, the flow through the said flow outlet 5 can be increased and reduced, respectively, and also be shut off.
  • a filling nozzle 6 for supplying gas to a not shown pressure container/bottle on which the control valve 1 is mounted.
  • FIG. 2 appears the same pressure and flow control valve 1 as shown in Fig. 1, but shown here partly sectioned in the part of the valve housing 2 that includes both the first pressure control step 11 and the second pressure control step 12.
  • a circle A is indicated an area shown in enlarged version in Fig. 3.
  • Both Figs. 2 and 3 show an example of how a first control step 11 is arranged in the valve housing 2 and in direct connection with a second control step 12.
  • the two control steps 11, 12 are arranged in series.
  • the first control step 11 is adapted for regulating the bottle pressure (PI) from e.g. 200 bar to 4.5 bar (P2) which is thus accessible from the pressure outlet 8.
  • the second pressure control step 12 is here adapted to regulate the already regulated pressure (P2) of 4.5 bar to a still lower pressure (P3), e.g. 1 bar (overpressure) which then is available in the flow outlet 6 via a flow disc 13 that is set via a spindle 14 connected with the handwheel 3.
  • P3 still lower pressure
  • the indicated pressure figures are only examples, and a pressure and flow control valve 1 can readily be designed for working with other, greater as well as smaller, pressures in the flow outlet 5 as well as in the pressure outlet 8.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Fluid Mechanics (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

La présente invention concerne une vanne de régulation de pression et de débit (1) destinée à être utilisée dans le cadre d'une régulation par paliers d'un débit, la vanne de régulation (1) comprenant, en plus d'un raccord (10) pour une source de pression, au moins une sortie de pression (8) avec une pression P2 et une sortie de débit (5) avec une pression P3, respectivement. Entre le raccord (10) pour une source de pression et la sortie de pression (8) est agencé au moins un premier étage de régulation de pression (11) pour réguler une pression de gaz PI à partir d'un premier niveau à un second niveau inférieur. La vanne de régulation (1) comprend en outre au moins un deuxième étage de régulation de pression (12) pour réguler une pression de gaz à partir d'un premier niveau à un troisième niveau inférieur, le second étage de régulation de pression (12) étant agencé entre la source de pression/le raccord (10) et la sortie de débit (5), dans le but, entre autres, de permettre l'utilisation de gaz à partir d'une sortie de pression sans qu'une réduction de pression sensible ne se produise sur une sortie de débit.
PCT/DK2014/050388 2013-11-14 2014-11-14 Vanne de régulation de pression et de débit WO2015070878A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA201370686 2013-11-14
DKPA201370686 2013-11-14

Publications (1)

Publication Number Publication Date
WO2015070878A1 true WO2015070878A1 (fr) 2015-05-21

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PCT/DK2014/050388 WO2015070878A1 (fr) 2013-11-14 2014-11-14 Vanne de régulation de pression et de débit

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4416154A1 (de) * 1994-05-09 1995-11-16 Oventrop Sohn Kg F W Durchflußregelventil
US6286543B1 (en) * 1998-12-16 2001-09-11 Gilbert Davidson Compressed gas regulator with flow control and internal gauge
WO2006046793A1 (fr) * 2004-10-29 2006-05-04 Sancheong Co., Ltd. Regulateur
US20070262279A1 (en) * 2004-09-15 2007-11-15 Leif Marstorp Apparatus for Regulating Flow of a Medium in a Heating and Cooling System
CN201028073Y (zh) * 2006-12-22 2008-02-27 重庆卡福汽车制动转向系统有限公司 一种汽车减压阀
WO2009132658A1 (fr) * 2008-04-30 2009-11-05 Broen A/S Vanne de réglage
EP2211247A2 (fr) * 2009-01-22 2010-07-28 VTI Ventil Technik GmbH Réducteur de pression pour gaz
WO2010090572A1 (fr) * 2009-02-05 2010-08-12 Tour & Andersson Ab Soupape avec fonction delta p et fonction de limitation d'écoulement

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4416154A1 (de) * 1994-05-09 1995-11-16 Oventrop Sohn Kg F W Durchflußregelventil
US6286543B1 (en) * 1998-12-16 2001-09-11 Gilbert Davidson Compressed gas regulator with flow control and internal gauge
US20070262279A1 (en) * 2004-09-15 2007-11-15 Leif Marstorp Apparatus for Regulating Flow of a Medium in a Heating and Cooling System
WO2006046793A1 (fr) * 2004-10-29 2006-05-04 Sancheong Co., Ltd. Regulateur
CN201028073Y (zh) * 2006-12-22 2008-02-27 重庆卡福汽车制动转向系统有限公司 一种汽车减压阀
WO2009132658A1 (fr) * 2008-04-30 2009-11-05 Broen A/S Vanne de réglage
EP2211247A2 (fr) * 2009-01-22 2010-07-28 VTI Ventil Technik GmbH Réducteur de pression pour gaz
WO2010090572A1 (fr) * 2009-02-05 2010-08-12 Tour & Andersson Ab Soupape avec fonction delta p et fonction de limitation d'écoulement

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