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GB2037082A - Bellows-operated devices - Google Patents

Bellows-operated devices

Info

Publication number
GB2037082A
GB2037082A GB7940777A GB7940777A GB2037082A GB 2037082 A GB2037082 A GB 2037082A GB 7940777 A GB7940777 A GB 7940777A GB 7940777 A GB7940777 A GB 7940777A GB 2037082 A GB2037082 A GB 2037082A
Authority
GB
United Kingdom
Prior art keywords
bellows
pressure
diaphragm
operate
push rod
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.)
Granted
Application number
GB7940777A
Other versions
GB2037082B (en
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.)
United Gas Industries Ltd
Original Assignee
United Gas Industries 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
Application filed by United Gas Industries Ltd filed Critical United Gas Industries Ltd
Publication of GB2037082A publication Critical patent/GB2037082A/en
Application granted granted Critical
Publication of GB2037082B publication Critical patent/GB2037082B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/32—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by bellows

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)

Abstract

Bellows-operated device wherein a pressure to be controlled is applied to the interior of the bellows (30) which operates indirectly a push rod (34) which in turn may operate an electrical switch. In order to render the device fail-safe, the bellows (30) is secured to a pressure pad (32) which contacts a flexible diaphragm (37). The bellows (30) is mounted in a housing (35) which is sealed by the diaphragm (37) which has a larger effective area than the bellows. Leakage of the bellows into the space there-around increases the overall pressure on the diaphragm which therefore tends to operate the push rod (34) to simulate an increase in the pressure being controlled. <IMAGE>
GB7940777A 1977-12-02 1978-12-01 Bellows-operated devices Expired GB2037082B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5037477 1977-12-02

Publications (2)

Publication Number Publication Date
GB2037082A true GB2037082A (en) 1980-07-02
GB2037082B GB2037082B (en) 1982-04-28

Family

ID=10455683

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7940777A Expired GB2037082B (en) 1977-12-02 1978-12-01 Bellows-operated devices

Country Status (1)

Country Link
GB (1) GB2037082B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0113952A1 (en) * 1982-11-10 1984-07-25 LUCAS INDUSTRIES public limited company Bellows actuators

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0113952A1 (en) * 1982-11-10 1984-07-25 LUCAS INDUSTRIES public limited company Bellows actuators

Also Published As

Publication number Publication date
GB2037082B (en) 1982-04-28

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19931201