Patent ID: 6302401
Filing Date: 2001-10-16
Classification: F04B,F16J

Abstract:
A combination of a substantially hydro-balanced stuffing box assembly in a pump defining at least one pump rod having an outer sealing surface, comprising:(a) a stuffing box housing defining an internal packing chamber for communication with a fluid being pumped and having a portion of the pump rod extending therethrough;(b) a primary seal being located within said internal packing chamber and in sealing relation with said stuffing box housing and having sealing engagement with the pump rod;(c) a safe fluid chamber being defined within said internal packing chamber and having a safe fluid therein in contact with said primary seal; and(d) a pressure transmitter element being movable within said internal packing chamber and being sealed with said primary seal and together with a portion of said primary seal defining a secondary seal disposed in sealing engagement with the pump rod, said pressure transmitter element having a portion thereof exposed to the pressure of the fluid being pumped and having a portion thereof exposed to said safe fluid, said pressure transmitter element transmitting pump pressure to said safe fluid within said safe fluid chamber and substantially pressure balancing said secondary seal with pump pressure to minimize wear thereof during pumping activity.