Riser recoil valve

A riser recoil valve for use with a tensioning system of a drilling rig comprising:

• a. a choke spool housing with a tank fluid port, a spool retainer port, and an actuator opening with a rotation limiting keyway;
• b. a choke spool disposed within the choke spool housing, the choke spool comprising:
• (i) an outer spool comprising:
• 1. an outer spool tubular body;
• 2. a first outer alignment shoulder connected on an end of the outer spool tubular body;
• 3. a second outer alignment shoulder connected on an opposite end of the outer spool tubular body;
• 4. an inner surface;
• 5. a first bearing groove formed on the inner surface at the end of the outer spool tubular body and a second bearing groove formed on the inner surface of the outer spool tubular body opposite the first bearing groove;
• and
• 6. a plurality of outer spool bidirectional flow holes formed through the outer spool tubular body;
• (ii) a rotatable inner spool for rotating within the outer spool comprising:
• 1. a rotatable inner spool tubular body having a rotatable inner spool outer surface;
• 2. a first end bearing groove formed on a first end of the rotatable inner spool outer surface;
• 3. a second end bearing groove formed on a second end of the rotatable inner spool outer surface;
• and
• 4. a plurality of rotatable inner spool bidirectional flow holes which move in and out of alignment with the plurality of outer spool bidirectional flow holes when the rotatable inner spool tubular body is rotated within the outer spool housing;
• (iii) a shaft that mates into the rotatable inner spool comprising:
• 1. a handle with a handle diameter and a coupling means;
• 2. a shaft body with a shaft body diameter larger than the handle diameter;
• 3. a clip ring shoulder with a clip ring shoulder diameter formed on the shaft body opposite the handle;
• an
• 4. an alignment shoulder with an alignment shoulder diameter between the clip ring shoulder and the handle, wherein the alignment shoulder diameter is larger than the clip ring shoulder diameter;
• (iv) a plurality of pressure neutralization holes formed in the shaft for balancing fluid pressure into and out of the choke spool housing;
• and
• (v) a plurality of non-oxidizing ball bearings installed between the first end bearing groove and the and second end bearing groove of the rotatable inner spool and the first bearing groove and the second bearing groove of the outer spool;
• c. an actuator coupling with a face and a back, a rotation limiting key on the face, and a shaft hub extending from the back, wherein the rotation limiting key engages the rotation limiting keyway and the shaft hub engages the choke spool;
• and
• d. an actuator system engages the actuator coupling to operate at a horsepower from 2 horsepower to 500 horsepower, wherein the actuator system connects to the choke spool rotating the rotatable inner spool to open and close alignment of the plurality of rotatable inner spool bidirectional flow holes relative to the plurality of outer spool bidirectional flow holes allowing hydraulic fluid to flow bidirectionally into and out of the choke spool housing and the choke spool to throttle a tensioner on the drilling rig to control a riser recoil event.