Fabricated resilient seal retention for large valve dampers

Claim 1

A VALVE SEAT RETENTION STRUCTURE FOR USE IN A VALVE BODY HAVING A THROUGH PASSAGE, A RESILIENT SEALING MEMBER POSITIONED ABOUT THE INNER PERIPHERY OF THE PASSAGE AND A BACKING MEMBER FIXED TO THE BODY AND ABUTTING ONE SIDE OF THE RESILIENT SEALING MEMBER, COMPRISING: A RETAINING MEMBER MOUNTED ON THE VALVE BODY ADJACENT THE OTHER SIDE OF THE RESILIENT SEALING MEMBER FOR MOVEMENT TOWARD AND AWAY FROM THE RESILIENT SEALING MEMBER, SAID RETAINING MEMBER HAVING A FIRST SURFACE FOR RECEIVING FORCES FROM ONE DIRECTION TO MOVE THE RETAINING MEMBER TOWARDS AND AWAY FROM THE RESILIENT SEALING MEMBER, SAID RETAINING MEMBER FURTHER HAVING A LOCKING SURFACE FOR RECEIVING FORCES FROM ANOTHER DIRECTION FOR LOCKING THE RETAINING MEMBER AGAINST MOVEMENT RELATIVE TO THE VALVE BODY AND THE RESILIENT SEALING MEMBER; A CAMMING MEMBER IN THE VALVE BODY ADJACENT THE RETAINING MEMBER HAVING A FIRST CAMMING SURFACE IN ABUTTING RELATION TO THE FIRST SURFACE OF THE RETAINING MEMBER FOR MOVING THE RETAINING MEMBER RESPONSIVE TO MOVEMENT OF THE CAMMING MEMBER, SAID CAMMING MEMBER HAVING A SECOND LOCKING SURFACE ADJACENT THE RETAINING MEMBER LOCKING SURFACE, SAID CAMMING MEMBER BEING MOUNTED TO THE VALVE BODY FOR ROTATION RELATIVE TO THE RETAINING MEMBER AND ALSO FOR MOVEMENT TOWARD AND AWAY FROM THE RETAINING MEMBER LOCKING SURFACE BETWEEN AN UNLOCKED POSITION AND A LOCKED POSITION; AND LOCKING MEANS FOR LOCKING THE CAMMING MEMBER AND RETAINING MEMBER IN SELECTED ADJUSTED POSITIONS.