Patent ID: 6530389
Filing Date: 2003-03-11
Classification: F16L,Y10T

Abstract:
A valve insertion method for inserting a valve in a line without stopping passage of water, comprising the steps of:rotatably mounting a seal-up housing on an existing pipe, such that the seal-up housing encloses a part of the existing pipe in an air tight state; accommodating a cutting tool, which is supported for rotation about an axis that extends in a radial direction of the existing pipe and is provided with a plurality of blades, in the seal-up housing; while rotating the cutting tool about the axis, (1) feeding the cutting tool in a radially inward direction of the existing pipe to slit the existing pipe, and (2) rotating the seal-up housing together with the cutting tool in a circumferential direction of the existing pipe to slit a top portion of the existing pipe in a range of approximately 180 degrees in the circumferential direction; and disposing a sluice valve having a sluice valve body at a point corresponding to a slit formed by slitting the existing pipe, the sluice valve body invades through the slit and into the existing pipe, such that the sluice valve body (1) clogs the slit and (2) is pressure-fitted to an inner circumferential surface of the existing pipe.