WO1995009674A1 - A servo gas regulating valve - Google Patents

A servo gas regulating valve Download PDF

Info

Publication number
WO1995009674A1
WO1995009674A1 PCT/NO1994/000160 NO9400160W WO9509674A1 WO 1995009674 A1 WO1995009674 A1 WO 1995009674A1 NO 9400160 W NO9400160 W NO 9400160W WO 9509674 A1 WO9509674 A1 WO 9509674A1
Authority
WO
WIPO (PCT)
Prior art keywords
chamber
valve body
servo
valve
control valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/NO1994/000160
Other languages
French (fr)
Inventor
Nils T. Ottestad
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.)
Ottestad Breathing Systems AS
Original Assignee
Ottestad Breathing Systems AS
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 Ottestad Breathing Systems AS filed Critical Ottestad Breathing Systems AS
Priority to DE69423505T priority Critical patent/DE69423505T2/en
Priority to EP94929687A priority patent/EP0722351B1/en
Priority to JP7510737A priority patent/JPH09504854A/en
Priority to US08/619,767 priority patent/US5690098A/en
Priority to AU78651/94A priority patent/AU686252B2/en
Publication of WO1995009674A1 publication Critical patent/WO1995009674A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K39/00—Devices for relieving the pressure on the sealing faces
    • F16K39/02—Devices for relieving the pressure on the sealing faces for lift valves
    • F16K39/024—Devices for relieving the pressure on the sealing faces for lift valves using an auxiliary valve on the main valve
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B9/00—Component parts for respiratory or breathing apparatus
    • A62B9/02—Valves
    • A62B9/022—Breathing demand regulators
    • A62B9/027—Breathing demand regulators pilot operated, i.e. controlled by valve means sensitive to a reduced downstream pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
    • B63C11/00—Equipment for dwelling or working underwater; Means for searching for underwater objects
    • B63C11/02—Divers' equipment
    • B63C11/18—Air supply
    • B63C11/22—Air supply carried by diver
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
    • B63C11/00—Equipment for dwelling or working underwater; Means for searching for underwater objects
    • B63C11/02—Divers' equipment
    • B63C11/18—Air supply
    • B63C11/22—Air supply carried by diver
    • B63C11/2227—Second-stage regulators

Definitions

  • the invention relates to a servo gas regulating valve comprising a housing having an inlet chamber and an outlet chamber, a main valve body cooperating with a seat separating the inlet chamber from the outlet chamber, a piston or the like separating the outlet chamber from a servo chamber, and a control valve arranged to be opened and closed by the main valve body.
  • Systems for supplying breathing gas are generally based on a regulated supply from reservoirs containing gas/air under pressure. In such systems the gas flow generally is controlled so that it is in accordance with the demand, i.e. it is the question of demand systems.
  • ordinary demand valves there is commonly a direct mechanical connection between a sensor diaphragm and the valve which opens or closes the nozzle opening.
  • a gas regulating valve of the introductorily stated type which, according to the invention, is characterized in that the control valve brings about a controlled gas flow to the servo chamber, which entails that the main valve body is forced to move such that the seat of the control valve at all times rests sealingly against the valve body of the control valve.
  • the valve according to the invention does not have stability problems as a consequence of friction in sealing means, and the regulating force is very small. Further, there is a minimum time delay between the control valve and the main valve, whereby a very precise control of large gas quantities is achieved.
  • the invention used both as a demand valve and as a pressure reduction valve, has been found to be very advantageous. It is simple to produce, it is not very sensitive to pressure variations, and it has a very good capacity.
  • Fig. 1 shows a cross-section of an embodiment of a regulating valve according to the invention used on a demand valve
  • Fig. 2 shows a somewhat enlarged sectional view of the regulating valve.
  • the illustrated demand valve consists of an outer casing 7 having a sensing diaphragm 8 which, through a lever 9 and an operating means 4, influences the gas regulating valve which is fixedly mounted to the casing 7.
  • the regulating valve comprises a housing 1 having an inlet chamber I and an outlet chamber II, a hollow main valve body 2 cooperating with a seat 3 separating the inlet chamber I from the outlet chamber II, a piston 12 separating the outlet chamber II from the servo chamber III of the valve, and a control valve comprising a valve body 5 and a seat 6, and which is arranged to be opened and closed by the main valve body 2.
  • the seat 6 of the control valve is arranged in a channel 15 extending axially through the main valve body 2 and connecting the inlet chamber I with the servo chamber III, and the control valve body 5 is connected to the operating means 4 of the demand valve through said channel.
  • the control valve regulates the gas flow between the inlet chamber and the servo chamber through the channel 15.
  • one side surface of the servo chamber III is constituted by one side surface of the piston 12 of which the other side surface faces the outlet chamber II and of which the central portion is rigidly connected to the main valve body 2.
  • the piston 12 there could have been provided a diaphragm or the like.
  • the main valve body 2 comprises a metal sleeve 11 which is pressed into a resilient sleeve 13 which constitutes the seat 6 of the control valve as well as the sealing surface between the main valve body 2 and the seat 3 of the main valve.
  • the metal sleeve 11 is provided with s barbes (not shown) and is pressed into the central part of the resilient sleeve 13.
  • the only spring which is used in the gas regulating valve is a small spring 10 which has the task to see to it that the valve body 5 of the control valve rests

Landscapes

  • Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Health & Medical Sciences (AREA)
  • Ocean & Marine Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Control Of Fluid Pressure (AREA)
  • Fluid-Driven Valves (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Safety Valves (AREA)

Abstract

A gas regulating valve, especially for use in breathing valves for diver masks and the like. The valve comprises a sleeve-shaped housing (1) having an inlet chamber (I) and an outlet chamber (II), a main valve body (2) cooperating with a seat (3) separating the inlet chamber (I) from the outlet chamber (II), a piston (12) or the like separating the outlet chamber (II) from a servo chamber (III), and a control valve (5, 6) arranged to be opened and closed by the main valve body (2). The control valve (5, 6) causes a controlled gas flow to the servo chamber (III), which entails that the main valve body (II) is forced to move such that the seat (6) of the control valve at all times rests sealingly against the valve body (5) of the control valve.

Description

A servo gas regulating valve
The invention relates to a servo gas regulating valve comprising a housing having an inlet chamber and an outlet chamber, a main valve body cooperating with a seat separating the inlet chamber from the outlet chamber, a piston or the like separating the outlet chamber from a servo chamber, and a control valve arranged to be opened and closed by the main valve body. Systems for supplying breathing gas are generally based on a regulated supply from reservoirs containing gas/air under pressure. In such systems the gas flow generally is controlled so that it is in accordance with the demand, i.e. it is the question of demand systems. In ordinary demand valves there is commonly a direct mechanical connection between a sensor diaphragm and the valve which opens or closes the nozzle opening. Similarly to the present invention, other demand valves are based on a servo principle. This implies that the pressure energy in a portion of the gas flow is utilized to amplify the force causing opening/closing of the nozzle. The pressure variations which have to be created on the sensor diaphragm to move the nozzle opening, thereby can be significantly reduced. Tradition¬ ally, servo valves have the weakness that they are constructed in a complicated manner and that they require frequent readjust- ments in order to operate satisfactorily. Further, servo valves often give an unstable gas regulation as a consequence of sealing means causing friction, or regulating mechanisms giving a time delay between the movement of the pilot valve and the main valve.
According to the invention there is provided a gas regulating valve of the introductorily stated type which, according to the invention, is characterized in that the control valve brings about a controlled gas flow to the servo chamber, which entails that the main valve body is forced to move such that the seat of the control valve at all times rests sealingly against the valve body of the control valve.
The valve according to the invention does not have stability problems as a consequence of friction in sealing means, and the regulating force is very small. Further, there is a minimum time delay between the control valve and the main valve, whereby a very precise control of large gas quantities is achieved. The invention, used both as a demand valve and as a pressure reduction valve, has been found to be very advantageous. It is simple to produce, it is not very sensitive to pressure variations, and it has a very good capacity.
The invention will be further described below with reference to the drawings, wherein
Fig. 1 shows a cross-section of an embodiment of a regulating valve according to the invention used on a demand valve, and
Fig. 2 shows a somewhat enlarged sectional view of the regulating valve.
The illustrated demand valve consists of an outer casing 7 having a sensing diaphragm 8 which, through a lever 9 and an operating means 4, influences the gas regulating valve which is fixedly mounted to the casing 7.
The regulating valve comprises a housing 1 having an inlet chamber I and an outlet chamber II, a hollow main valve body 2 cooperating with a seat 3 separating the inlet chamber I from the outlet chamber II, a piston 12 separating the outlet chamber II from the servo chamber III of the valve, and a control valve comprising a valve body 5 and a seat 6, and which is arranged to be opened and closed by the main valve body 2. The seat 6 of the control valve is arranged in a channel 15 extending axially through the main valve body 2 and connecting the inlet chamber I with the servo chamber III, and the control valve body 5 is connected to the operating means 4 of the demand valve through said channel. The control valve regulates the gas flow between the inlet chamber and the servo chamber through the channel 15. When the valve body of the control valve is displa¬ ced, a gas flow is supplied to the servo chamber, and this causes a corresponding displacement of the main valve body.
As shown in the drawings, one side surface of the servo chamber III is constituted by one side surface of the piston 12 of which the other side surface faces the outlet chamber II and of which the central portion is rigidly connected to the main valve body 2. Instead of the piston 12 there could have been provided a diaphragm or the like.
In the illustrated embodiment, the main valve body 2 comprises a metal sleeve 11 which is pressed into a resilient sleeve 13 which constitutes the seat 6 of the control valve as well as the sealing surface between the main valve body 2 and the seat 3 of the main valve. The metal sleeve 11 is provided with s barbes (not shown) and is pressed into the central part of the resilient sleeve 13.
When the user of the demand valve inhales, the pressure in the chamber below the sensing diaphragm 8 falls, whereby the lever 9 acts upon the operating means 4 and the valve body 5 of ιo the control valve which opens for a gas flow from the inlet chamber I to the servo chamber III. This gas flow provides for a pressure bild-up in the servo chamber, so that the piston 12 and therewith the main valve body 2 are pressed upwards. The main valve body is forced to follow the movement of the servo valve is body 5, the piston 12 - and therewith the main valve body and the seat 6 of the control valve - immediately being positioned so that an equilibrium arises between gas supply and gas delivery from the servo chamber III. The gas delivery from the servo chamber is modest, and takes place in a friction-free clearance
20 14 between the operating means 4 and the housing 1. This implies that the main valve body 2 at all times is forced to follow the movement of the servo valve body 5 in a slavish manner. Conse¬ quently, there is obtained a very stable control of the gas quantity flowing through the valve. The pressure forces governing
25 the movement of the piston 12 are so large that the friction in the sealing surface between the outlet chamber II and the servo chamber III is of no consequence for the stability in the gas regulation.
An important advantage of the gas regulating valve
30 according to the invention is that one obtains a good capacity and a precise gas control even if the supply pressure should vary to a considerable extent. The only spring which is used in the gas regulating valve, is a small spring 10 which has the task to see to it that the valve body 5 of the control valve rests
35 against the seat 6 so that the valve seals immediately when the gas supply is connected. In principle, this spring is not necessary, since the pressure difference between the inlet chamber I and the servo chamber III at all times seeks to push the valve body 5 of the control valve back against the seat 6.

Claims

P a t e n t c l a i m s
5 1. A servo gas regulating valve comprising a housing
(1) having an inlet chamber (I) and an outlet chamber (II), a main valve body (2) cooperating with a seat (3) separating the inlet chamber (I) from the outlet chamber (II), a piston (12) or the like separating the outlet chamber (II) from a servo chamber o (III), and a control valve (5, 6) arranged to be opened and closed by the main valve body (2), characterized in that the control valve (5, 6) brings about a controlled gas flow to the servo chamber (III), which entails that the main valve body (2) is forced to move such that the seat (6) of the control valve at s all times rests sealingly against the valve body (5) of the control valve.
2. A servo gas regulating valve according to claim 1, characterized in that the seat (6) of the control valve is arranged in a channel (15) extending axially through the main o valve body (2) and connecting the inlet chamber (I) with the servo chamber (III).
3. A servo gas regulating valve according to claim 1 or 2, characterized in that the servo chamber (III) has a movable side surface constituted by a piston (12), a diaphragm or the 5 like of which one side surface faces the outlet chamber (II) and of which the central portion is rigidly connected to the main valve body (2).
0
5
PCT/NO1994/000160 1993-10-05 1994-10-04 A servo gas regulating valve Ceased WO1995009674A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE69423505T DE69423505T2 (en) 1993-10-05 1994-10-04 GAS REGULATION SERVO VALVE
EP94929687A EP0722351B1 (en) 1993-10-05 1994-10-04 A servo gas regulating valve
JP7510737A JPH09504854A (en) 1993-10-05 1994-10-04 Servo type gas control valve
US08/619,767 US5690098A (en) 1993-10-05 1994-10-04 Servo gas regulating valve
AU78651/94A AU686252B2 (en) 1993-10-05 1994-10-04 A servo gas regulating valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO933551A NO178121C (en) 1993-10-05 1993-10-05 Servo gas control valve
NO933551 1993-10-05

Publications (1)

Publication Number Publication Date
WO1995009674A1 true WO1995009674A1 (en) 1995-04-13

Family

ID=19896481

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1994/000160 Ceased WO1995009674A1 (en) 1993-10-05 1994-10-04 A servo gas regulating valve

Country Status (7)

Country Link
US (1) US5690098A (en)
EP (1) EP0722351B1 (en)
JP (1) JPH09504854A (en)
AU (1) AU686252B2 (en)
DE (1) DE69423505T2 (en)
NO (1) NO178121C (en)
WO (1) WO1995009674A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0509369D0 (en) * 2005-05-07 2005-06-15 Foss Nicholas J A breathing apparatus demand valve
US20090065007A1 (en) 2007-09-06 2009-03-12 Wilkinson William R Oxygen concentrator apparatus and method
JP5528899B2 (en) * 2010-04-28 2014-06-25 興研株式会社 Supply valve
US20120055483A1 (en) * 2010-09-07 2012-03-08 Wilkinson William R Shutdown system and method for an oxygen concentrator
WO2014059409A1 (en) 2012-10-12 2014-04-17 Inova Labs, Inc. Oxygen concentrator systems and methods
JP6321663B2 (en) 2012-10-12 2018-05-09 イノヴァ ラボ，インコーポレイテッド Methods and systems for oxygen-enriched gas delivery
WO2014059408A1 (en) 2012-10-12 2014-04-17 Inova Labs, Inc. Dual oxygen concentrator systems and methods
US9440179B2 (en) 2014-02-14 2016-09-13 InovaLabs, LLC Oxygen concentrator pump systems and methods
US11458274B2 (en) 2016-05-03 2022-10-04 Inova Labs, Inc. Method and systems for the delivery of oxygen enriched gas

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2285155A1 (en) * 1974-09-23 1976-04-16 Christianson Raymond REGULATOR ACTING ON DEMAND FOR BREATHABLE GAS ACTUATED BY PILOT VALVE FOR BREATHING UNIT
NO151447B (en) * 1981-08-28 1985-01-02 Nils T Ottestad BALANCED GAS CONTROL VALVE.
DE4040793A1 (en) * 1990-12-15 1992-06-17 Ulrich Gumpert Electronically regulated iron lung - has pressure sensor supplying signals to electronic regulator controlling auxiliary valve of servo valve

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US591013A (en) * 1897-10-05 Safety-valve
US873324A (en) * 1907-03-04 1907-12-10 August Michaels Automatic valve.
US2925824A (en) * 1952-12-15 1960-02-23 Edward A Rockwell Fluid control valve
US3945393A (en) * 1972-02-29 1976-03-23 Giuseppe Teatini Regulating valve
IT211686Z2 (en) * 1987-01-28 1989-04-07 Amf Mares Spa REGULAR PRESSURE DEVICE FOR THE SECOND STAGE OF REDUCTION OF AIR RESPIRATORY APPLIANCES

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2285155A1 (en) * 1974-09-23 1976-04-16 Christianson Raymond REGULATOR ACTING ON DEMAND FOR BREATHABLE GAS ACTUATED BY PILOT VALVE FOR BREATHING UNIT
NO151447B (en) * 1981-08-28 1985-01-02 Nils T Ottestad BALANCED GAS CONTROL VALVE.
DE4040793A1 (en) * 1990-12-15 1992-06-17 Ulrich Gumpert Electronically regulated iron lung - has pressure sensor supplying signals to electronic regulator controlling auxiliary valve of servo valve

Also Published As

Publication number Publication date
JPH09504854A (en) 1997-05-13
AU7865194A (en) 1995-05-01
EP0722351A1 (en) 1996-07-24
NO933551D0 (en) 1993-10-05
NO933551L (en) 1995-04-06
EP0722351B1 (en) 2000-03-15
NO178121B (en) 1995-10-16
DE69423505D1 (en) 2000-04-20
DE69423505T2 (en) 2000-06-29
US5690098A (en) 1997-11-25
AU686252B2 (en) 1998-02-05
NO178121C (en) 1996-01-24

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