Patent ID: 8845303
Filing Date: 2014-09-30
Classification: F03C,F04B,Y10T

Abstract:
1. A torque control valve comprising: (a) a sleeve having a first axial end, a second axial end, and a central bore, the sleeve having a system pressure port, a compensator pressure port, and a control pressure port, each pressure port extending into the sleeve central bore; (b) a spool disposed within the central bore of the sleeve, the spool having a first axial end, a second axial end, and a central bore, the spool having a first recess area, a second recess area, and a third recess area between the first and second axial ends of the spool, the first and third recesses each having a port into the spool central bore; and (c) a piston rod disposed through the central bore of the spool, the piston rod including a groove orifice feature having a spiral groove with a first length, the piston rod being configured such that at least a portion of a fluid flowing from the port in the first recess area to the port in the third recess area must flow through at least a portion of the first length of the spiral groove, wherein the portion of the first length across which fluid flowing from the first recess area port to the third recess area port must traverse varies based on the position of the piston rod relative to the spool.