Solenoid-operated valve for thermally insulated piping and attachment construction therefor
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United States of America Patent
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Apr 29, 1997
Grant Date -
N/A
app pub date -
May 23, 1995
filing date -
Dec 18, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a solenoid-operated valve for a thermally insulated piping having a thermally insulated outer periphery suitable for transporting low-temperature fluid, high-temperature fluid or the like and relates also to an attachment construction for the valve. Conventionally, with this type of solenoid-operated valve for a thermally insulated piping, since it is necessary to to increase a magnetic flux density of the solenoid coil by increasing the number of turns of the oil or the electric current to be applied thereto, there has been the problem of high production costs and running costs. In the case of the solenoid-operated valve for a thermally insulated piping according to the present invention, inside a heat-insulating layer (6) surrounding flow passages (7, 20, 21, 26, 33) in the form of a pipe, there is provided a fixed core (23) constituting a magnetic circuit between a solenoid coil (17) and a movable coil (18). Then, magnetic resistance between the solenoid coil and the movable core may be reduced, without entailing enlargement of the movable core and the production costs and the running costs may be reduced.
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