Hybrid spool valve for multi-port pulse tube
AssigneesSumitomo Heavy Industries, Ltd., SHI-APD Cryogenics, Inc.
InventorRalph C. Longsworth
Life of this patent
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Abstract
The problems of reducing the torque required to turn the valve, eliminating wear dust, and extending the life of the valves in Gifford McMahon (G-M) type multi-port pulse tube refrigerators are solved by using a rotary spool valve having radial clearance to control flow to and from the regenerator, and using face seal ports on the end of the spool to control flow to and from the pulse tubes.
Claims10
An improved multi-ported rotary spool valve for a G-M type pulse tube refrigerator having a main flow path to a regenerator and at least one flow path to the warm end of a pulse tube comprising one or more radial ports for flow to a regenerator and one or more ports in an end face for flow to a pulse tube.
Dependencies are inferred from the claim text.