GB2470902B - Rotary apparatus - Google Patents

Rotary apparatus

Info

Publication number
GB2470902B
GB2470902B GB0909813.8A GB0909813A GB2470902B GB 2470902 B GB2470902 B GB 2470902B GB 0909813 A GB0909813 A GB 0909813A GB 2470902 B GB2470902 B GB 2470902B
Authority
GB
United Kingdom
Prior art keywords
resistor
housing
rotary contact
rotor
contact means
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.)
Active
Application number
GB0909813.8A
Other versions
GB2470902A (en
GB0909813D0 (en
Inventor
Donald Ian Blackmore
Derek Charles Smith
Andrew Ian Blackmore
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.)
ROTAVAL Ltd
Original Assignee
ROTAVAL 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 ROTAVAL Ltd filed Critical ROTAVAL Ltd
Priority to GB0909813.8A priority Critical patent/GB2470902B/en
Publication of GB0909813D0 publication Critical patent/GB0909813D0/en
Priority to PCT/GB2010/001121 priority patent/WO2010142948A2/en
Publication of GB2470902A publication Critical patent/GB2470902A/en
Application granted granted Critical
Publication of GB2470902B publication Critical patent/GB2470902B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B9/00—Safety arrangements
    • G05B9/02—Safety arrangements electric
    • 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
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0025—Electrical or magnetic means
    • 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
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
    • F16K37/0083—For recording or indicating the functioning of a valve in combination with test equipment by measuring valve parameters

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

A rotary apparatus comprises a housing 20, a rotor 22 and at least one intrinsically safe monitoring circuit 40 for detecting rotor/housing contact or a monitoring circuit fault condition. The monitoring circuit includes intrinsically safe amplifier barrier means 28 having a maximum voltage and substantially fixed constant current output, the barrier 28 being electrically connected to both the rotor by rotary contact means and the housing 20. The circuit includes a first resistor 46 arranged in parallel with the rotary contact means and second resistor 48 electrically connected in series between the housing 20 and the rotary contact means and the first resistor 46. The impedance of the first resistor 46 is such that in a normal operative non-contact state current substantially flows through the rotary contact means to the second resistor 48. In a contact fault state current flows through the rotary contact means, the rotor 22 and the housing 20, and in a circuit fault condition current flows through the first and second resistors with the rotary contact being shorted such that the state of the apparatus is determined by the resistance of the circuit. Energy limitation is provided by the adaption of an alternative barrier, which uses an active output that delivers a fixed constant current to the valve. An upper limit exists on the voltage that can be output to generate the constant current in order to maintain intrinsic safety levels. This enables the current to be tightly controlled and achieves accurate low level sensing.
GB0909813.8A 2009-06-08 2009-06-08 Rotary apparatus Active GB2470902B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0909813.8A GB2470902B (en) 2009-06-08 2009-06-08 Rotary apparatus
PCT/GB2010/001121 WO2010142948A2 (en) 2009-06-08 2010-06-07 Rotary apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0909813.8A GB2470902B (en) 2009-06-08 2009-06-08 Rotary apparatus

Publications (3)

Publication Number Publication Date
GB0909813D0 GB0909813D0 (en) 2009-07-22
GB2470902A GB2470902A (en) 2010-12-15
GB2470902B true GB2470902B (en) 2013-03-06

Family

ID=40937049

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0909813.8A Active GB2470902B (en) 2009-06-08 2009-06-08 Rotary apparatus

Country Status (2)

Country Link
GB (1) GB2470902B (en)
WO (1) WO2010142948A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL408632A1 (en) * 2014-06-23 2016-01-04 Volen Spółka Akcyjna Separating interface of electric control line for the explosion endangered zones, with the control of the controlling line parameters

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5152536A (en) * 1991-04-16 1992-10-06 Theodor Bardas Fluid seal with a maintained gap of seal faces
JPH11241774A (en) * 1998-02-25 1999-09-07 Dmw Corp Rotary valve

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5152536A (en) * 1991-04-16 1992-10-06 Theodor Bardas Fluid seal with a maintained gap of seal faces
JPH11241774A (en) * 1998-02-25 1999-09-07 Dmw Corp Rotary valve

Also Published As

Publication number Publication date
GB2470902A (en) 2010-12-15
WO2010142948A2 (en) 2010-12-16
GB0909813D0 (en) 2009-07-22
WO2010142948A3 (en) 2011-06-30

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