A pilot valve assembly for connection to a hydraulic control valve, the hydraulic control valve having a cover at least partially enclosing an actuator chamber, the cover having a threaded control socket that provides access to flow channels (108, 110) in fluid flow connection with the actuator chamber of the hydraulic control valve and a downstream connection of the hydraulic control valve, the pilot valve assembly comprising: a pilot valve comprising a mechanism for controlling a pressure within the hydraulic control valve actuator chamber, characterized in that the pilot valve assembly further comprises: (a) a connector comprising a generally cylindrical body surrounding an internal passageway that extends parallel to an axis of said body, a first end portion of said connector being formed with external threading for engaging the threaded control socket of the hydraulic control valve, a second end of said connector being provided with an array of teeth arrayed around an edge of said second end, a circumferential slot being formed in an external surface of said connector spaced from said second end; (b) said pilot valve having a recess configured to mate with said second end of said connector, said recess having a plurality of complementary teeth configured for engaging said array of teeth of said connector in a plurality of angular orientations; and (c) a clamping arrangement for engaging said circumferential slot so as to clamp said pilot valve to said second end of said connector with said complementary teeth engaged with said array of teeth, thereby fixing an angular orientation of said pilot valve. a pilot valve comprising a mechanism for controlling a pressure within the hydraulic control valve actuator chamber, characterized in that the pilot valve assembly further comprises: (a) a connector comprising a generally cylindrical body surrounding an internal passageway that extends parallel to an axis of said body, a first end portion of said connector being formed with external threading for engaging the threaded control socket of the hydraulic control valve, a second end of said connector being provided with an array of teeth arrayed around an edge of said second end, a circumferential slot being formed in an external surface of said connector spaced from said second end; (b) said pilot valve having a recess configured to mate with said second end of said connector, said recess having a plurality of complementary teeth configured for engaging said array of teeth of said connector in a plurality of angular orientations; and (c) a clamping arrangement for engaging said circumferential slot so as to clamp said pilot valve to said second end of said connector with said complementary teeth engaged with said array of teeth, thereby fixing an angular orientation of said pilot valve. (a) a connector comprising a generally cylindrical body surrounding an internal passageway that extends parallel to an axis of said body, a first end portion of said connector being formed with external threading for engaging the threaded control socket of the hydraulic control valve, a second end of said connector being provided with an array of teeth arrayed around an edge of said second end, a circumferential slot being formed in an external surface of said connector spaced from said second end; (b) said pilot valve having a recess configured to mate with said second end of said connector, said recess having a plurality of complementary teeth configured for engaging said array of teeth of said connector in a plurality of angular orientations; and (c) a clamping arrangement for engaging said circumferential slot so as to clamp said pilot valve to said second end of said connector with said complementary teeth engaged with said array of teeth, thereby fixing an angular orientation of said pilot valve.