Pneumatically operated refrigerator with self-regulating valve

Refrigeration – Gas compression – heat regeneration and expansion – e.g.,...


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13762537, F25B 900




A self-regulating fluid operated valve system for a "no-work" refrigerator comprises a spring loaded pilot valve, connected to and acting against the pressure in the refrigerator chamber, provided with a throttling section which may be connected alternatively to the fluid supply or the fluid exhaust by a second valve moving with the displacer. The pilot valve also has a section which makes alternative connection between the refrigeration chamber and the supply of compressed refrigerant during the fully pressurized portion of the cycle. The valving connected to the displacer is in the form of a spool valve incorporated into the piston and so arranged that its low pressure section is between its high pressure section and the refrigeration chamber.

patent: 3188821 (1965-06-01), Chellis
patent: 4294077 (1981-10-01), Sarcia et al.
patent: 4294600 (1981-10-01), Sarcia et al.


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