Patent ID: 6899491
Filing Date: 2005-05-31
Classification: F15B,F16L

Abstract:
1. A pipe relining machine including an hydraulic control circuit, the relining machine having a non-rotating portion, a rotary union and a rotating portion, the non-rotating portion having an electrical and hydraulic connections which are supplied from a remote control position from above ground or outside the pipe being relined, the rotary union being to transfer hydraulic fluid and electric control and feedback signals to and from various operating components within the rotating portion from the non-rotating portion, the rotating portion having electrical solenoid controlled hydraulic control block which is remotely controllable from above ground or outside the pipe, the hydraulic control circuit including a fluid pressure supply line and a fluid return line to a fluid storage tank, a motor controller to control a motor supplied by the fluid pressure supply line, and a radial position controller, the radial position controller supplying fluid under pressure to a radial positioning arrangement to set the diameter of the pipe being relined, the radial position controller having a first normally closed valve supplying fluid under pressure to the radial positioning arrangement and a second normally open valve allowing fluid to be withdrawn from the radial positioning arrangement.