| 摘要 |
<p>A method for inserting a valve in a line includes the step of providing a valve assembly (10) having a valve body (11) with two sections (17, 18) adapted to be assembled over an existing pipe (14) and gate (12) adapted to cut through the pipe (14) as the gate (12) advances from an open position toward a closed position. The method proceeds by installing the valve assembly (10) on the existing pipe (10) with the gate (12) in the open position and then moving the gate (12) toward the closed position to thereby cut through the pipe (14). A rotatable pipe-cutter version of a valve assembly (10) constructed according to the invention includes at least one cutting tooth (21) and the valve body (11) is configured so that an operator (13) can rotate the body (11) on the existing pipe (14) while the gate (12) is advanced toward the closed position. A guillotine version, suited for use with pipes made of polyethylene and other sliceable materials, includes a gate (12) with a cutting edge that slices through the pipe (14) as the gate (12) is advanced toward the closed position.</p> |
