Patent ID: 6460349
Filing Date: 2002-10-08
Classification: F16K,F25B

Abstract:
A rotary valve unit comprising:a housing comprising a high pressure input port connectable with an outlet port of a compressor unit, a low pressure input port connectable with an inlet port of the compressor unit; a first output port connectable with a regenerator; a second output port connectable with a pulse tube; a middle pressure input port connectable with a reservoir; a first rotary valve disposed in the housing, the first rotary valve comprising a first valve seat with a first sliding plane, a first valve element with a second sliding plane opposing and contacting the first sliding plane; a second rotary valve disposed in the housing, the second rotary valve comprising a second valve seat with a third sliding plane and a second valve element with a fourth sliding plane opposing and contacting the third sliding plane; a motor disposed in the housing, the motor comprising a shaft for synchronously rotating the first valve element and the second valve element; and a recessed space formed in at least one of sliding surfaces between the third sliding plane and the fourth sliding plane; and a communication passage communication between the recessed space and the low pressure input port, whereby communication between the high pressure input port and the first output port, and communication between the low pressure input port and the first output port is established and interrupted upon rotation of the second sliding plane relative to the first sliding plane during rotation of the first valve element relative to the first valve seat, and whereby communication between the second output port and the middle pressure input port is established and interrupted when the fourth sliding plane slidingly rotates relative to the third sliding plane upon rotation of the second valve element relative to the second valve seat.