| US 7,549,295 B2 | ||
| Three track valve for cryogenic refrigerator | ||
| Jin Lin Gao, Allentown, Pa. (US) | ||
| Assigned to Sumitomo Heavy Industries, Ltd., Tokyo (Japan); and SHI-APD Cryogenics, Inc., Allentown, Pa. (US) | ||
| Appl. No. 10/580,924 PCT Filed Feb. 09, 2005, PCT No. PCT/US2005/004748 § 371(c)(1), (2), (4) Date May 30, 2006, PCT Pub. No. WO2005/078363, PCT Pub. Date Aug. 25, 2005. |
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| Claims priority of provisional application 60/544144, filed on Feb. 11, 2004. | ||
| Prior Publication US 2007/0119189 A1, May 31, 2007 | ||
| Int. Cl. F25B 9/00 (2006.01); F16K 11/074 (2006.01) | ||
| U.S. Cl. 62—6 [137/625.46] | 14 Claims |
| 1. A multi valve two-stage pulse tube type GM refrigerator having a rotary valve that comprises one track for flow to the
regenerator and two tracks for flow to the pulse tubes,
wherein the valve has two high pressure ports to the pulse tubes located on a single track and two low pressure ports from
the pulse tubes located on a separate single track.
|