of the drilling fluid main flow 110 past the pilot flow screen 130 through the main flow entrance 150 into the flow cone 170 through the main orifice 180 into and around the main valve 190 past the main valve pressure chamber 200 past the main valve seals 225 through the main valve support block 350 after which it combines with the pilot exit flow 320 both of which flow through the pilot valve support block 330 to become the main exit flow 340 the pilot flow 100 flows through the pilot flow screen 130 into the pilot flow screen chamber 140 through the pilot flow upper annular 160 through the pilot flow lower annular 210 and into the pilot flow inlet channel 230 where it then flows up into the main valve feed channel 220 until it reaches the main valve pressure chamber 200 where it flows back down the main valve feed channel 220 through the pilot flow exit channel 360 through the pilot orifice 250 past the pilot valve 260 where the pilot exit flow 320 flows over the pilot flow shield 270 where it combines with the drilling fluid main flow 110 to become the main exit flow 340 as it exits the pilot.