Patent ID: 7275606

Claim:
A strainer device for straining a high pressure well fluid upstream of a choke, the strainer device comprising: (a) a housing body including: a central cavity, a valve stem borehole at a first end of the housing, a central axis of the housing body coaxial with the valve stem borehole and passing through the cavity and the first end of the housing body, a first and a second inlet passageway separated by an angle from each other in a plane normal to the central axis, wherein each inlet passageway intersects the central cavity, a first and a second outlet passageway separated by an angle from each other in the same plane as the first and second inlet passageways, wherein the first outlet passageway is contrapositioned from the first inlet passageway and the second outlet passageway is contrapositioned from the second inlet passageway and each outlet passageway intersects the central cavity, and a removable closure mounted on a second end of the housing body, wherein the removal of the closure provides access to the central cavity; and (b) a valve plug positioned within the central cavity of the housing body, the valve plug being rotatable between a first and a second position, the valve plug having: a high pressure plug body, a plug body central cavity having an opening at a first end of the plug body, a valve stem attached to the plug body at a second end of the plug body, wherein the valve stem traverses the valve stem hole in the housing body, an entry port passing through a first side of the plug body, wherein the entry port is aligned with the first inlet passageway whenever the valve plug is in the first position and the entry port is aligned with the second inlet passageway whenever the valve plug is in the second position, and an exit port comprising a plurality of perforations penetrating through a second side of the plug body opposed to the entry port such that the perforations are aligned with the first outlet passageway whenever the valve plug is in the first position and the perforations are rotated into alignment with the second outlet passageway whenever the valve plug is rotated to the second position.