Patent ID: 6167959
Filing Date: 2001-01-02
Classification: E21B

Abstract:
A stuffing box for a cylindrical pump rod comprising: a first housing adapted to be supported on a structure which includes a passage in which pressure fluids are present and for which a seal is to be formed around said pump rod to prevent pressure fluid from escaping said passage, said first housing including a first bore forming a clearance bore for said pump rod, a second bore larger than said first bore, and a first portion extending between said second bore and a transverse end wall of said first housing; a packing housing including a second portion engageable with said first portion of said first housing, said packing housing including a central bore formed therein; a packing assembly disposed in said bore in said packing housing and operable to be in sealing engagement with said pump rod; a packing gland operably engageable with said packing assembly at substantially one end thereof; a bushing including a first part slidably disposed in said bore in said packing housing and operably engageable with an opposite end of said packing assembly for compressing said packing assembly, said bushing including an end face exposed to pressure fluid from said passage for urging said bushing to compress said packing assembly, a transverse shoulder and a second part extending from said shoulder in sliding relationship with a bore formed in one of said housings and including said end face exposed to said pressure fluid; and spring means operably engageable with said shoulder for urging said bushing into forcible engagement with said packing assembly to impose compression forces on said packing assembly.