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A pneumatically operated device responsive to a signal pressure applied thereto from a source of negative pressure for controlling the atmospheric air applied to a control device and for controlling an electric signal applied to an electric control circuit. The pneumatically operated device includes

A pneumatically operated device responsive to a signal pressure applied thereto from a source of negative pressure for controlling the atmospheric air applied to a control device and for controlling an electric signal applied to an electric control circuit. The pneumatically operated device includes a diaphragm assembly assembled within a housing to subdivide the interior of the housing into first and second chambers respectively in open communication with the negative pressure source and the atmospheric air, and valve and switch mechanisms arranged within the housing to be operated in response to movement of the diaphragm assembly caused by the pressure difference between the first and second chambers.

대표청구항 ▼

A pneumatically operated device responsive to a signal pressure applied thereto from a source of pneumatic pressure for controlling the atmospheric air applied to a control device and for controlling an electric signal applied to an electric control circuit, said pneumatically operated device compri

A pneumatically operated device responsive to a signal pressure applied thereto from a source of pneumatic pressure for controlling the atmospheric air applied to a control device and for controlling an electric signal applied to an electric control circuit, said pneumatically operated device comprising: a housing provided with a first inlet port for connection to said pneumatic pressure source, a second inlet port in open communication with the atmospheric air, and an outlet port for connection to said control device; a diaphragm assembly assembled within said housing in a fluid tight manner to subdivide the interior of said housing into first and second chambers respectively in open communication with said first and second inlet ports, said diaphragm assembly being integrally provided with a movable member which is moved by the pressure difference between said first and second chambers; valve means including a valve seat member adjustably threaded into said housing and a valve seat formed on an inner end portion of said valve seat member, said valve seat member having an air passage formed therein to permit the flow of atmospheric air from said second inlet port to said outlet port therethrough, and a valve member cooperating with said movable member to open and close said valve seat in response to the movement of said diaphragm assembly; and switch means arranged within said housing to be connected to said control circuit and including a pair of contacts one of which is arranged to be operated in response to the movement of said diaphragm assembly.