US 4,303,195 AGranted

Thermally responsive valve device

AssigneeAisin Seiki Kabushiki Kaisha

InventorsNobuyuki Hashimoto, Atsushi Satomoto

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Abstract

A thermally responsive valve includes first and second bimetallic disks which are adapted to snap-over in response to first and second predetermined temperatures. First and second inlet ports are connected to vacuum and atmospheric pressure sources respectively and first and second outlet ports are connectable to first and second vacuum actuators respectively. The thermally responsive valve further includes first and second valve members, one of which controls the communication of vacuum to the first vacuum actuator in response to the snap-over action of the first bimetallic disk and the other of which controls the application of vacuum to said second vacuum actuator in response to the snap-over action of the second bimetallic disk. When communication between the vacuum source and the first and second vacuum actuators is interrupted by said first and second valve members, the first and second actuators will be then connected to the atmosphere through the second inlet port.

Claims4

Dependent claims

A thermally responsive valve assembly comprising:

a housing;
a first inlet port adapted to be connected to a vacuum source;
a second inlet port adapted to be connected to atmospheric pressure;
a first outlet port adapted to be connected to a first fluid operated device;
a second outlet port adapted to be connected to a second fluid operated device;
first passage means formed in said housing for connecting said first inlet port with said first outlet port;
second passage means formed in said housing for connecting said first inlet port with said second outlet port;
third passage means for connecting said second inlet port with said first outlet port;
fourth passage means for connecting said second inlet port with said second outlet port, flow restriction means being located in said fourth passage;
first valve means having first and second valves, said first valve being disposed in said first passage means and said second valve means being disposed in said third passage means;
first bimetallic disk means for operating said first valve means in response to changes in temperature;
second valve means disposed in said second passage means;
and
second bimetallic disk means for operating said second valve means in response to changes in temperature.

11 more elements

Dependencies are inferred from the claim text.