| SHI-APD CRYOGENICS, INC. Patent applications |
| Patent application number | Title | Published |
|---|
| 20090173083 | CO-AXIAL MULTI-STAGE PULSE TUBE FOR HELIUM RECONDENSATION - A two-stage pulse tube refrigerator having a compact design, low vibration and low heat loss is provided where at least the 2 | 07-09-2009 |
| 20090151803 | HYBRID SPOOL VALVE FOR MULTI-PORT PULSE TUBE - 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. | 06-18-2009 |
| 20080245077 | Multiple Rotary Valve For Pulse Tube Refrigerator - A rotary disc valve unit and refrigerators containing a rotary disc valve unit that has multiple valves, in which at least one rotary valve has ports connecting to the regenerator and at least one rotary valve has ports connecting to the warm ends of one or more pulse tubes where the rotary valve with ports for the regenerator has lighter contact than the rotary valve with ports for the pulse tubes. The valve face is divided into an inner area with ports for the pulse tubes and an outer area with ports for the regenerator, the inner area having a greater sealing pressure than the outer area. | 10-09-2008 |
