Magnetic Release Patents (Class 236/88)
  • Patent number: 9057244
    Abstract: A method for reversible temperature sensitive control of the flow of fluid in oil and/or gas production, involves a control device or an autonomous valve operating by the Bernoulli principle and includes a moveable disk or body provided within a housing for opening and closing the valve, involving use of the Curie-effect in order to position the body in a preferred position within the housing at a temperature below a certain, preferred transition or Curie temperature. An apparatus for reversible temperature sensitive control of the flow of fluid in oil and/or gas production including a control device or an autonomous valve operating by the Bernoulli principle and including a moveable disk or body provided within a housing for opening and closing the valve, the body and housing including a ferromagnetic material having a certain, preferred Curie temperature, the temperature being selected in order to position the body in a preferred position in the housing during installation or operation.
    Type: Grant
    Filed: November 6, 2009
    Date of Patent: June 16, 2015
    Assignee: STATOIL PETROLEUM ASA
    Inventor: Sigbjørn Øvland
  • Patent number: 8292259
    Abstract: A magnetic valve arrangement for controlling flow of fluid, the magnetic valve arrangement having at least one ferromagnetic element forming a portion of a magnetic circuit, a valve member and a valve seat; the valve member has a passage therethrough for the flow of fluid and is moveable between a first position, in which the valve member abuts the valve seat to restrict a fluid flow, and a second position, in which the valve member is spaced from the valve seat to allow a fluid flow into and through the passage in the valve member, wherein the position of the valve member is dependent on the temperature of the ferromagnetic element.
    Type: Grant
    Filed: May 15, 2008
    Date of Patent: October 23, 2012
    Assignee: Rolls-Royce PLC
    Inventor: John R. Webster
  • Patent number: 7950590
    Abstract: An actuator is disclosed which operates on the principle of the variable magnetic properties of materials with respect to temperature. As temperature is raised past Curie temperature, magnetic permeability of certain materials drops significantly to a value close to free space permeability. However, depending on the material selection, magnetic permeability may be significantly higher below Curie temperature. This principle is used to cause magnetic attractive force to move an actuator at one temperature, while permitting a return spring force to move the actuator at another temperature by changing the pathway traversed by most magnetic lines of flux from a magnetic source. The actuator may be employed to provide a temperature activated electrical switch or fluid valve. The temperature activated valves are suited to use in high temperature environments, such as SAGD wells.
    Type: Grant
    Filed: March 14, 2008
    Date of Patent: May 31, 2011
    Assignee: Schlumberger Technology Corporation
    Inventors: Murat Ocalan, Kuo Chiang Chen
  • Patent number: 6873514
    Abstract: An integrated solenoid system including a single housing containing a solenoid, a controller and one or more electrical connections. The controller includes temperature compensating means and/or voltage compensating means thereby providing predetermined, substantially constant currents to said solenoid. The housing includes an integral two-part end cover.
    Type: Grant
    Filed: June 5, 2002
    Date of Patent: March 29, 2005
    Assignee: Trombetta, LLC
    Inventors: Dennis A. Maller, Todd McMahon
  • Patent number: 4610142
    Abstract: An apparatus and method for controlling the operating temperatures and differential temperature of a curie effect temperature sensing switch is disclosed. The temperature switch is adapted to provide temperature control of a cold plate in a reagent refrigerator. The temperature switch activates cold plate cooling devices when the cold plate temperature is above a first operating temperature and deactivates the cold plate cooling devices when the cold plate temperature is below a second operating temperature. An electromagnet is fixed external of and relative to the temperature switch so that the strength of the external magnetic field sets the operating temperatures of the temperature switch. A potentiometer is used to incrementally vary the current supplied to the electromagnet to thereby incrementally adjust the strength of the external magnetic field and the operating temperatures.
    Type: Grant
    Filed: October 19, 1984
    Date of Patent: September 9, 1986
    Assignee: Abbott Laboratories
    Inventor: Charles L. Davis
  • Patent number: 4590999
    Abstract: A thermal responsive valve having a temperature sensitive magnetic material for operating a valve in response to temperature variations. A valve is held closed by magnetic forces from mutually attractive magnetic means. One or more of the magnetic means are formed of materials that have strong magnetic properties producing magnetic forces which vary according to temperature. The magnetic materials are selected to provide a design temperature which when reached abruptly causes the material to lose its magnetic properties (permeability) becoming magnetically inert opening the valve. When the materials cools to the design temperature and below it abruptly retains its magnetic properties and will close the valve.
    Type: Grant
    Filed: July 29, 1985
    Date of Patent: May 27, 1986
    Inventor: Alvin A. Snaper
  • Patent number: 4407448
    Abstract: A temperature sensing valve includes a casing having an internal fluid passage member formed therein, a permanent magnet mounted in the casing, a valve body which includes a magnetically soft, amorphous metal member supported in a thermally sensitive region of the casing for movement between a first and second position and being magnetically coupled to the permanent magnet so that flow through the fluid passage member can be interrupted in response to magnetic excitement by the permanent magnet of the valve body, and a spring for urging the valve body in a first direction to permit fluid flow through the fluid passage member wherein when the temperature of the second thermally sensitive region is below the Curie point of the second valve body, the valve body is excited by the permanent magnet to maintain the fluid passage member closed against the biasing force of the spring whereas when the temperature of the thermally sensitive region reaches the Curie point of the valve body, the valve body constitutes a p
    Type: Grant
    Filed: August 28, 1981
    Date of Patent: October 4, 1983
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Minoru Yamanaka, Mitsuyuki Suzuki, Hideo Haneda, Masatoshi Kato, Masataka Ohtsuki
  • Patent number: 4361275
    Abstract: A solenoid valve with a temperature safety unit includes a body having a fluid passage formed therein, a solenoid mounted in the body, a valve member operatively associated with the body for displacement to open or close the fluid passage in response to a magnetic field as the solenoid is energized and deenergized, and a return spring operatively associated with the body and which includes a magnetically soft, amorphous metal member disposed in a pass of flux from the solenoid within a region the temperature of which is to be determined wherein the return spring is connected to the valve member and normally urges the valve member to a first position when the solenoid is deenergized, the magnetically soft, amorphous metal member having a Curie point which constitutes an operating point of the return spring such that when the temperature of the return spring exceeds the Curie point, the valve member is forceably displaced to the first position irrespective of energization of the solenoid.
    Type: Grant
    Filed: August 28, 1981
    Date of Patent: November 30, 1982
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventor: Kojiro Mori
  • Patent number: 4303196
    Abstract: A temperature sensitive valve in which the annular valve seat is made of a thermal sensitive magnetic material having a Curie temperature that is of a preselected value. A vertically movable valve plug is positioned below the valve seat and contains a permanent magnet which normally urges the plug up into the valve seat to close the valve, but which allows the valve to open when the temperature of the valve seat exceeds the Curie temperature.
    Type: Grant
    Filed: March 24, 1980
    Date of Patent: December 1, 1981
    Inventors: Arnold Raines, William August
  • Patent number: 4125221
    Abstract: A temperature-dependent liquid metal flowrate control device includes a magnet and a ferromagnetic member defining therebetween a flow path for liquid metal, the ferromagnetic member being formed of a material having a curie temperature at which a change in the flow rate of the liquid metal is desired. According to the preferred embodiment the magnet is a cylindrical rod magnet axially disposed within a cylindrical member formed of a curie material and having iron pole pieces at the ends. A cylindrical iron shunt and a thin wall stainless steel barrier are disposed in the annulus between magnet and curie material. Below the curie temperature flow between steel barrier and curie material is impeded and above the curie temperature flow impedance is reduced.
    Type: Grant
    Filed: September 7, 1977
    Date of Patent: November 14, 1978
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: Roger D. Carlson
  • Patent number: 4036339
    Abstract: A noise is generated unavoidably owing to hunting phenomenon that appears in process of increasing or decreasing torque to be transmitted by a hydraulic coupling in a hitherto known type, when it is subjected to change of the ambient temperature.A purpose of this invention is to provide a new and unique hydraulic coupling which enables hydraulic connection to be effected very quickly in such a way that engagement or disengagement between ferrite and magnet is applied to transfer mechanism in hydraulic coupling, depending on the ambient temperature.The above purpose of the invetion has been accomplished as follows.Magnetical attractive force between ferrite and magnet is predetermined to overcome spring force in a normal temperature, and working temperature for this new mechanism according to the invention is selected around at Curie temperature of said ferrite material.
    Type: Grant
    Filed: January 12, 1976
    Date of Patent: July 19, 1977
    Assignee: Usui Kokusai Sangyo Kabushiki Kaisha
    Inventor: Yasubee Kikuchi