GB715838A - Improvements in or relating to gas or vapour flow controlling apparatus, e.g. for breathing equipment - Google Patents

Improvements in or relating to gas or vapour flow controlling apparatus, e.g. for breathing equipment

Info

Publication number
GB715838A
GB715838A GB757/52A GB75752A GB715838A GB 715838 A GB715838 A GB 715838A GB 757/52 A GB757/52 A GB 757/52A GB 75752 A GB75752 A GB 75752A GB 715838 A GB715838 A GB 715838A
Authority
GB
United Kingdom
Prior art keywords
pressure
gas
orifice
controlling apparatus
breathing equipment
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.)
Expired
Application number
GB757/52A
Inventor
Philip Frank Payne
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.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
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 National Research Development Corp UK filed Critical National Research Development Corp UK
Priority to GB757/52A priority Critical patent/GB715838A/en
Publication of GB715838A publication Critical patent/GB715838A/en
Expired legal-status Critical Current

Links

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
    • 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
    • G05D7/0106—Control of flow without auxiliary power the sensing element being a flexible member, e.g. bellows, diaphragm, capsule

Landscapes

  • Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Control Of Fluid Pressure (AREA)

Abstract

715,838. Fluid-pressure actuated valves. NATIONAL RESEARCH DEVELOPMENT CORPORATION. Jan. 9, 1953 [Jan. 10, 1952], No. 757/52. Class 135. [Also in Group VI] Gas or vapour flow controlling apparatus, e.g. for breathing equipment, comprises a pressure reducing valve adapted for connection upstream to a source of gas or vapour under pressure and an orifice downstream of the valve, the reducing valve maintaining the pressure upstream of the orifice at such a value compared with the downstream pressure that the orifice operates at a pressure ratio equal to or less than the critical pressure ratio, i.e. in a choked condition. A valve 4 operated by a spring-loaded diaphragm 3, or piston or bellows, maintains a constant pressure of gas in the chamber 9 supplied via inlet 2a. The orifice 8 allows a supersonic flow of gas therethrough so that the mass flow of gas to a receptacle connected at 2b is unaffected by pressure variations in the receptacle.
GB757/52A 1952-01-10 1952-01-10 Improvements in or relating to gas or vapour flow controlling apparatus, e.g. for breathing equipment Expired GB715838A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB757/52A GB715838A (en) 1952-01-10 1952-01-10 Improvements in or relating to gas or vapour flow controlling apparatus, e.g. for breathing equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB757/52A GB715838A (en) 1952-01-10 1952-01-10 Improvements in or relating to gas or vapour flow controlling apparatus, e.g. for breathing equipment

Publications (1)

Publication Number Publication Date
GB715838A true GB715838A (en) 1954-09-22

Family

ID=9709994

Family Applications (1)

Application Number Title Priority Date Filing Date
GB757/52A Expired GB715838A (en) 1952-01-10 1952-01-10 Improvements in or relating to gas or vapour flow controlling apparatus, e.g. for breathing equipment

Country Status (1)

Country Link
GB (1) GB715838A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2918061A (en) * 1955-12-02 1959-12-22 Spirotechnique Breathing apparatus
FR2475904A1 (en) * 1980-02-14 1981-08-21 Broady William & Son Ltd RESPIRATORY
GB2175980A (en) * 1985-05-23 1986-12-10 Moteurs Societe Nationale D Et Pressure reducer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2918061A (en) * 1955-12-02 1959-12-22 Spirotechnique Breathing apparatus
FR2475904A1 (en) * 1980-02-14 1981-08-21 Broady William & Son Ltd RESPIRATORY
GB2175980A (en) * 1985-05-23 1986-12-10 Moteurs Societe Nationale D Et Pressure reducer

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