Patent ID: 8448659
Filing Date: 2013-05-28
Classification: E21B,F16K,Y10T

Abstract:
1. A check valve assembly for well stimulation operations comprising: a valve body having an axially extending passageway including an inlet and a valve body seat, the valve body having a first discharge port extending in a first lateral direction from the passageway; a valve cap slidably engagable with the valve body, the valve cap having an opening with a valve cap seat and at least one discharge port that is alignable with the first discharge port of the valve body; a piston disposed within the passageway, the piston having first and second sealing surfaces and open and closed positions, in the closed position, the first sealing surface engages the valve body seat to prevent fluid communication between the inlet and the first discharge port, in the open position, the second sealing surface engages the valve cap seat allowing fluid communication between the inlet and the first discharge port; and a spring disposed within the passageway between the piston and the valve cap, the spring biasing the piston toward the closed position.