A PRESSURE RELIEF VALVE FOR BLOWN FIBRE CLOSURE

摘要

A PRESSURE RELIEF FOR BLOWN FIBRE CLOSURES IS PROVIDED HAVING CONSTITUENT COMPONENTS FABRICATED FROM PLASTIC. AN ADAPTOR (101) IS PROVIDED FOR CONNECTION TO A BLOWN FIBRE CLOSURE, AND A BODY (104), WELDED TO THIS ADAPTOR (101), IS PROVIDED TO ENCLOSE A PISTON (102) AND SPRING (103) WITHIN, SUCH THAT THEY ARE PROTECTED FROM THE INGRESS OF SILT AND WATER. THE PISTON (101) IS ARRANGED TO PROVIDE A DOUBLE SEAL SUCH THAT A PRESSURE RELIEF VALVE PLUG (208) AND AN OPENING (213) IN THE ENCLOSING BODY (104) ARE CLOSED OR OPENED SIMULTANEOUSLY TO PREVENT THE INGRESS OF SILT AND/OR WATER ON THE ONE HAND AND THE UNHINDERED ESCAPE OF PRESSURIZED FLUID ON THE OTHER.