Hot gas relief valve

Claim 1

A HOT GAS RELIEF VALVE COMPRISING A CASING DEFINING AN INLET PASSAGE EXTENDING INWARDLY FROM THE EXTERIOR OF THE CASING AND DEFINING A VALVE SEAT ELEMENT AT THE INNER END OF SAID PASSAGE AND AN OUTLET PASSAGE EXTENDING FROM SAID SEAT ELEMENT TO THE EXTERIOR OF SAID CASING; A POPPET ELEMENT WITHIN SAID CASING MOVABLE BETWEEN OPEN AND CLOSED POSITIONS WITH RESPECT TO SAID SEAT ELEMENT TO INTERCONNECT AND DISCONNECT SAID PASSAGES RESPECTIVELY; SAID ELEMENTS HAVING COOPERATING ANNULAR CONTACT PORTIONS CONTACTING EACH OTHER WHEN SAID POPPET IS IN ITS SAID CLOSED POSITION; SAID POPPET ELEMENT COMPRISING AN OUTER PORTION REMOTE FROM SAID CONTACT PORTION INCLUDING A CYCLINDRICAL MEMBER OPEN AT ITS OUTER END AND CONNECTED WITH SAID CONTACT PORTION AT ITS INNER END BY FLOWRESTRICTING MEANS, SAID CYLINDRICAL MEMBER HAVING A RADIALLY EXTENDING SPRING-RETAINING SURFACE AND BEING AT LEAST PARTIALLY COATED WITH A LAYER OF HEAT-INSULATING MATERIAL; A CAP MEMBER ADJUSTABLY FASTENED TO SAID CASING INCLUDING AN ANNULAR SPRING-RETAINING SURFACE AND A CYLINDRICAL BAFFLE MEMBER OF HIGH HEAT TRANSFER MATERIAL SUBSTANTIALLY ENCLOSING SAID CYLINDRICAL MEMBER AND COOPERATING THEREWITH TO PROVIDE AN ELONGATED PATH FOR GAS FLOW BETWEEN SAID INLET PASSAGE AND THE EXTERIOR OF SAID CYLINDRICAL BAFFLE MEMBER; AND A SPRING INTERPOSED BETWEEN SAID SPRING-RETAINING SURFACES WHEREBY THE INLET GAS PRESSURE TENDING TO OPEN SAID POPPET ELEMENT IS OPPOSED BY GAS PRESSURE ACTING AGAINST SAID OUTER PORTION AND THE FORCE OF SAID SPRING.