Shut off apparatus for a fluid passage, method for controlling t

Details Shut off apparatus for a fluid passage, method for controlling t Shut off apparatus for a fluid passage, method for controlling t

1991-03-11

1992-04-07

Cohan, Alan

Fluid handling

Processes

Affecting flow by the addition of material or energy

137828, F17D 116

Patent

active

051018489

ABSTRACT:
Method of opening and closing a fluid passage comprises the steps of freezing fluid in the fluid passage by first cooling the fluid to a temperature below the freezing point of the fluid to close the fluid passage and after the fluid passage is closed, raising the temperature of the fluid close (or just below) to the freezing point of the fluid, whereby the fluid passage is maintained in a closed state with a small power supply and the responsiveness in opening the fluid passage is enhanced.

REFERENCES:
patent: 4203472 (1980-05-01), Dulaney
patent: 4989626 (1991-02-01), Takagi

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