Patent ID: 6666270
Filing Date: 2003-12-23
Classification: E21B,Y10S

Abstract:
A reciprocating pump vent-dump valve utilized in hydrocarbon service for controlling the flow of produced fluid comprising:a hollow piston having an upper end, a lower end, an inside and an outside; a barrel having a top, a bottom, an interior and an exterior and adapted to slidingly receive said piston about said outside thereof; a head having a topside and a bottom-side threadingly secured at said bottom-side thereof to said upper end of said piston; a venting port situated approximately midway between said top and said bottom of said piston wherein said venting port provides communication between said inside and said outside of said piston; and, means for slidingly retaining said piston within said barrel; wherein said piston is capable of limited upward and limited downward movement within said barrel such that when said piston is fully upward said venting port is in further communication with said exterior of said barrel placing the vent-dump valve in a venting position thereby allowing flow of produced fluid from said inside of said piston to said exterior of said barrel and such that when said piston is fully downward said venting port is not in communication with said exterior of said barrel placing the vent-dump valve in a closed position thereby inhibiting flow of produced fluid from said inside of said piston to said exterior of said barrel, and wherein said head is adapted to threadingly receive a downhole pump assembly or a standing valve assembly at said topside thereof.