EP0212873A1 - Überdrucklungenautomat - Google Patents

Überdrucklungenautomat Download PDF

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Publication number
EP0212873A1
EP0212873A1 EP86305808A EP86305808A EP0212873A1 EP 0212873 A1 EP0212873 A1 EP 0212873A1 EP 86305808 A EP86305808 A EP 86305808A EP 86305808 A EP86305808 A EP 86305808A EP 0212873 A1 EP0212873 A1 EP 0212873A1
Authority
EP
European Patent Office
Prior art keywords
valve
jewel
seat
valve seat
resilient material
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
EP86305808A
Other languages
English (en)
French (fr)
Inventor
Paul Alexander
Ian Victor Maxwell
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.)
Sabre Safety Ltd
Original Assignee
Sabre Safety Ltd
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 GB858519926A external-priority patent/GB8519926D0/en
Priority claimed from GB868603390A external-priority patent/GB8603390D0/en
Application filed by Sabre Safety Ltd filed Critical Sabre Safety Ltd
Publication of EP0212873A1 publication Critical patent/EP0212873A1/de
Ceased legal-status Critical Current

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Classifications

    • 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
    • A62B9/025—Breathing demand regulators with tilting opening action

Definitions

  • This invention relates to positive pressure demand valves for controlling the flow of gas in a breathing system.
  • the sealing member is a tilt valve member the stem of which passes through an aperture in a valve seat, the stem being moved by a diaphragm in the demand valve upon inhalation in order that the tilt valve member shall rock on the seat thereby causing the valve to open and emit breathable gas such as air or oxygen from a pressure source of the gas.
  • the positive pressure demand valve therefore experiences wear which does not arise in other demand valves in which there is no contact between the valve member and the valve seat when the valve is open.
  • both the tilt valve member and the valve seat are free to turn about their longitudinal axes and do in fact so rotate as a result of repeated operation of the demand valve. In consequence the wear caused by the rocking or pivoting movement when the demand valve opens is spread over an annular area of both the tilt valve member and the valve seat.
  • the seat of the positive pressure demand valve has been made using phosphor bronze, and the tilt valve member has been made from Nylon 6. It is with these materials that, as a result of repeated operations of the valve, the relatively soft material of the tilt valve member can embed into the seat with the result that leakage through the valve occurs, or the breathing performance is impaired in some way, for example the valve does not open as it should in response to inhalation.
  • a positive pressure demand valve comprising a valve body having an inlet and an outlet, a diaphragm within the valve body, a valve seat mounted within the inlet to the valve body, the valve seat including a jewel having an aperture therethrough constituting a flow passage for gas supplied under pressure, and a tilt valve member having a stem extending through the aperture in the seat jewel, one end of the stem contacting the diaphragm and arranged to be movable thereby in consequence of a reduction of pressure within the valve body, and a head on the stem on the side of the seat jewel remote from the diaphragm, the head constituting a sealing member engageable with the valve seat, and the head including a jewel which, in the closed condition of the valve, engages the seat jewel to prevent the flow of gas through the seat.
  • each jewel is a corundum stone, conveniently a ruby or sapphire.
  • each jewel is a corundum ring stone, but the jewels are different.
  • One of the jewels advantageously includes a portion of frusto-conical shape, the flat surface of the frustum constituting the surface engaged by the other jewel in the closed condition of the valve.
  • the use of a jewel having such a portion of frusto-conical shape enables the contact areas of the two jewels to be reduced to an optimum area for obtaining the best sealing contact between the two jewels.
  • the seat jewel is the jewel which includes the portion of frusto-conical shape.
  • the resilient mounting of the jewels may be obtained by making the bodies of the members in which the jewels are mounted entirely of the resilient material.
  • the head of the tilt valve may be a plastics cap in which the jewel is mounted as an insert and similarly the body of the valve seat may be made of a plastics material.
  • either or both of the jewels may have a cushioning layer of resilient material such as rubber or plastics material between the jewel and a hard member.
  • the seat jewel is an insert in a valve seat made of brass or similar nonferrous material or of stainless steel.
  • the jewel is inset in a recess in the seat, the recess being machined to a size such that the jewel is a tight fit in the recess, so tight a fit it is almost an interference fit.
  • an annular cushion of a rubber or other resilient material is placed in the base of the recess.
  • the circumferential surface of the jewel may be coated with an engineering adhesive, for example a methacrylate adhesive, which sets once the jewel has been inserted into the recess and in contact with the cushion of resilient material.
  • the jewel may be inserted into the recess in the seat without any adhesive and held in position against the cushion of resilient material in the recess either by plating the metallic seat in order to form a lip holding the jewel in position, or else by turning a preformed lip on the metallic seat over into a position to retain the jewel.
  • the jewel in the sealing member which is for example the tilt valve member may be inserted as a snap fit within a recess in a member of plastics material, for example Nylon 66, or may be mounted in situ as part of the process of forming the tilt valve member.
  • a positive pressure demand valve which has two plastics body parts 1 and 2 of generally dished shape secured together at their outer peripheries by a clamping ring 3 secured by a clamping screw 4.
  • the body part 2 is integrally moulded with a cylindrical inlet 5 which receives a subassembly 6 of the components shown in Figure 2.
  • the body part 2 is also formed with a cylindricaloutlet 7 having a threaded ring 8 for attaching the demand valve to the inlet of a face mask not shown.
  • valve stem 10 which extends through the cylindrical inlet 5 and carries at its end remote from the diaphragm a head 12 which constitutes a sealing member.
  • the valve stem 10 and the head 12 are shown, together with the inventive features of the demand valve, in Figure 2 to which reference will now be made.
  • the valve stem 10 extends through a brass body 13 of a valve seat and through the aperture in a jewel 14 which is advantageously a corundum ring stone.
  • the jewel 14 is mounted as an insert in a machined recess in the seat body 13 upon a layer 11 of rubber material of an annular shape.
  • the body 13 and the jewel 14 together constitute the valve seat, of which the seat surface is provided by the jewel 14.
  • the valve stem 10 carries at its end remote from the diaphragm 9 the head 12 which comprises a plastics cap 16 in which a jewel 15, preferably another corundum ring stone of a different shape, is a snap fit.
  • the jewel 15 is thus mounted in a resilient material while the jewel 14 is resiliently mounted in the body 13 as a result of the layer 11 which is an annular cushion.
  • FIGS. 3 and 4 are side cross-sectional views of the jewels 14 and 15 on an enlarged scale.
  • the jewel 14 is formed to have a central precisely dimensioned circular aperture 17 and a frusto-conical portion 18 at the end of the jewel 14 which will be engaged by the sealing member.
  • This frusto-conical portion 18 of the jewel 14 is formed so that a major part 19 of the surface of the jewel 14 facing the sealing member is an inclined conical surface and only a minor part 20 of that surface surrounding the aperture 17 through the jewel 14 is flat.
  • the jewel 15 as shown in Figure 4 is a simple corundum ring stone having its outermost corners chamferred.
  • the main surface 21 of the jewel 15 facing the seat jewel 14 is a flat surface.
  • the sealing member which is the head 12 engages the valve seat to close the valve, which it does with the flat surface 21 of the jewel 15 contacting the whole of the flat surface 20 of the jewel 14, the area of surface contact is limited by the relatively small area of the annular flat surface 20 of the seat jewel 14, thereby enabling a good gas-tight seal to be obtained.
  • a hose connection 22 which is connected to the valve seat by screw threads 23 and which also has a screw thread 24 for receiving the hose from a pressure source of breathable gas.
  • the junction of the hose connection 22 and the valve seat body 13 is sealed by "0" rings 25, 26 and “0” rings 27 are also provided for sealing the valve seat body to the inlet 5 of the demand valve shown in Figure 1.

Landscapes

  • Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Check Valves (AREA)
EP86305808A 1985-08-08 1986-07-29 Überdrucklungenautomat Ceased EP0212873A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8519926 1985-08-08
GB858519926A GB8519926D0 (en) 1985-08-08 1985-08-08 Valves
GB868603390A GB8603390D0 (en) 1986-02-12 1986-02-12 Valves
GB8603390 1986-02-12

Publications (1)

Publication Number Publication Date
EP0212873A1 true EP0212873A1 (de) 1987-03-04

Family

ID=26289627

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86305808A Ceased EP0212873A1 (de) 1985-08-08 1986-07-29 Überdrucklungenautomat

Country Status (1)

Country Link
EP (1) EP0212873A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117931A (en) * 1982-03-19 1983-10-19 Dowty Hydraulic Units Ltd Electro-hydraulic servo valves
EP0126412A2 (de) * 1983-05-19 1984-11-28 SEKUR S.p.A. Ventil für einen Druckluftatmungsapparat
DE3420815A1 (de) * 1984-05-30 1986-05-22 Andreas Dr. 1000 Berlin Kage Elektronische dosiereinheit zur dosierung geringster loesungsmittelmengen unter hohem druck mittels eines nahezu traegheitslosen mikrodosierventils, eines loesungsmittelunabhaengigen flussmesssystems und einer axialverschleppungsarmen messstrecke

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117931A (en) * 1982-03-19 1983-10-19 Dowty Hydraulic Units Ltd Electro-hydraulic servo valves
EP0126412A2 (de) * 1983-05-19 1984-11-28 SEKUR S.p.A. Ventil für einen Druckluftatmungsapparat
DE3420815A1 (de) * 1984-05-30 1986-05-22 Andreas Dr. 1000 Berlin Kage Elektronische dosiereinheit zur dosierung geringster loesungsmittelmengen unter hohem druck mittels eines nahezu traegheitslosen mikrodosierventils, eines loesungsmittelunabhaengigen flussmesssystems und einer axialverschleppungsarmen messstrecke

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR SE

17P Request for examination filed

Effective date: 19870723

17Q First examination report despatched

Effective date: 19890201

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19900407

RIN1 Information on inventor provided before grant (corrected)

Inventor name: ALEXANDER, PAUL

Inventor name: MAXWELL, IAN VICTOR