Four-way switching valve
a technology of switching valve and valve body, which is applied in the direction of valve operating means/release devices, refrigeration components, light and heating apparatus, etc., can solve the problems of insufficient sealing of the valve portion when the valve is opened, the temperature of the coolant is not high enough to obtain and the temperature of the coolant is not high enough to achieve sufficient heating temperature in winter
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second embodiment
FIG. 5 is a longitudinal sectional view of a four-way switching valve according to the invention, in a switching position taken when its solenoid is OFF. It should be noted that in FIG. 5, component parts and elements similar or equivalent to those of the four-way switching valve shown in FIG. 1 are designated by identical reference numerals, and detailed description thereof is omitted.
The four-way switching valve according to the second embodiment is distinguished from the four-way switching valve according to the first embodiment in its further enhanced heat insulating effects. That is, a heat-insulating sleeve 34a formed of a material having a low thermal conductivity, e.g. a resin is arranged inside the passage via which the high-temperature high-pressure refrigerant is introduced from the port A, and heat-insulating sleeves 35a, 36a similarly formed of the resin are arranged inside the cylinders in which the plugs 2, 4 are arranged. Further, heat-insulating sleeves 37, 38 simil...
first embodiment
The four-way switching valve constructed above operates similarly to that when its solenoid is turned ON or Off.
FIG. 6 is a longitudinal sectional view of a four-way switching valve according to a third embodiment of the invention, in a switching position taken when its solenoid is OFF. FIG. 7 is a longitudinal sectional view of the four-way switching valve according to the third embodiment of the invention, in a switching position taken when its solenoid is ON. It should be noted that in FIGS. 6 and 7, component parts and elements similar or equivalent to those of the four-way switching valve shown in FIG. 1 are designated by identical reference numerals, and detailed description thereof is omitted.
The four-way switching valve according to the third embodiment is distinguished from that according to the first embodiment in that the construction of the three-way solenoid valve 18 is modified. That is, the three-way solenoid valve 18 of the four-way switching valve urges the needles...
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