Temperature sensitive valve arrangement

Claim 1

IN A TEMPERATURE-SENSITIVE VALVE ARRANGEMENT FOR VOLUMETRIC CONTROL OF FLUID FLOW THERETHROUGH, SAID FLUID HAVING A TEMPERATURE LEVEL IN THE CRYOGENIC RANGE, THE COMBINATION OF A VALVE BODY MEMBER AND A VALVE SEAT MEMBER MOUNTED FOR MOVEMENT RELATIVE TO EACH OTHER, A POPPET VALVE CARRIED BY THE MEMBERS AND MOVABLE RELATIVE TO THE VALVE SEAT MEMBER, THE FLW OF FLUID THROUGH THE ARRANGEMENT BEING RESPONSIVE TO THE LAST-MENTINED RELATIVE MOVEMENT, SPRING MEANS COMPRESSIVELY INTERPOSED BETWEEN THE MEMBERS AND NORMALLY BIASING SAME FOR MOVEMENT RELTIVE TO EACH OTHER IN ONE DIRECTION, AN EXPANSION AND CONTRACTION DEVICE IN PRESSURED INTERPOSITION BETWEEN SAID MEMBERS, SAID DEVICE BEING SUBJECT TO EXPANDING AND CONTRACTING MOVEMENTS IN RESPONSE TO THE DEPARTURE THEREOF FROM A DETERMINED TEMPERATURE LEVEL, THE EXPANSION MOVEMENT OF SAID DEVICE BEING IN OPPOSITION TO SAID ONE DIRECTION MOVEMENT BETWEEN THE MEMBERS AND THE CONTRACTION MOVEMENT OF SAID DEVICE BEING COMPLEMENTARY TO SAID ONE DIRECTION MOVEMENT BETWEEN THE MEMBERS, FLUID INLET AND OUTLET PART MEANS COMMUNICATING WITH THE ARRANGEMENT, AND HEAT TRANSFER MEANS IN DIRECT THERMAL COMMUNICATION WITH THE ARRANGEMENT TO VARY THE TEMPERATURE LEVEL OF THE EXPANSION AND CONTRACTION DEVICE ABOVE AND BELOW SAID DETERMINED LEVEL AND THEREBY CONTROL THE FLOW OF FLUID THROUGH THE ARRANGEMENT.