Check valve, associated downhole data collection system and inner core barrel assembly

A check valve comprising:

• a valve body defining a fluid flow path, the valve body of generally tubular configuration having an inner circumferential surface and a valve seat comprising a portion of the inner circumferential surface;
• a valve member located in the valve body, the valve member having a valve stop;
• a coupling mechanism coupling the valve member to the valve body, the coupling mechanism arranged to allow the valve member to move linearly in an axial direction relative to the valve body on to and off of the valve seat and maintain a fixed rotational relationship with the valve body;
• and
• a centralizing system configured to substantially centralize the valve member within the valve body while moving in the axial direction wherein the centralizing system comprises an outer peripheral surface which lies adjacent the inner circumferential surface of the valve body and a plurality of flow channels formed in outer peripheral surface enabling fluid to flow across a spline band.

A check valve comprising:

• a valve body defining a fluid flow path;
• a valve member located in the valve body, the valve member having a valve stop;
• and
• a coupling mechanism coupling the valve member to the valve body, the coupling mechanism arranged to allow the valve member to move linearly in an axial direction relative to the valve body on to and off of the valve seat and maintain a fixed rotational relationship with the valve body;
• and
• a data acquisition system retained in the valve member, wherein the data acquisition system is a core orientation system.

A check valve comprising:

• a valve body defining a fluid flow path;
• a valve member located in the valve body, the valve member having a valve stop;
• and
• a coupling mechanism coupling the valve member to the valve body, the coupling mechanism arranged to allow the valve member to move linearly in an axial direction relative to the valve body on to and off of the valve seat and maintain a fixed rotational relationship with the valve body;
• and
• an electrical power generation component located within or attached to the valve member.