Abstract: A valve of the type wherein high pressure fluid moves through a first moveable member (112) that lies in a first valve body (116), through a rotor channel (162), and though a second moveable member (150) in a second body, with the rotor being rotatable to direct the fluid into a selected passage of the second body. In this valve, forces on the rotor vary with the pressure of the fluid, but are decreased to reduce friction and therefore reduce rotation torque. Forces on the rotor are decreased by constructing each moveable member with a cylindrical surface (135) that is dynamically sealed against. Each valve body includes a body and an insert (126) threaded into a front end of the body. The insert has an internal flange (132) with a flange front end (133) that abuts the rear of a spring (120) that urges the movable member forward towards the rotor, and with a flange rear end (204) that abuts a seal device (121) that dynamically seals to the cylindrical surface (135) of the moveable member.