| 摘要 |
<p>PURPOSE: To provide a pig which is capable of coping with the large variation in the inner diameter of the piping, keeping the sealability even at a bend part of the piping of small radius of curvature, affecting less to the sealability by the fluid pressure in the piping, and being moved with small pig propulsive pressure even when a rubber elastic body which is not very soft and high in the wear resistance, and small in the wear of a seal part and long in the service life. CONSTITUTION: In a pig, a coil spring member 3 is located on the inner side of a cylindrical elastic pig body 1, each end is sealed by a pig end part head 2 to form a space part 4 which is shut off from the outside, and the compressive fluid 6 and the non-compressive fluid 5 is sealed inside.</p> |
