A VALVE DEVICE FOR PIGGING OF PIPELINES

摘要

A device for receiving and launching a pig (21) carried through a fluid-transferring pipeline by means of the fluid pressure. The device comprises a housing (15) having a through-going fluid flow duct (16) and a duct (17) branched off therefrom and leading to a pig chamber (27), and a pig-receiving ball valve (18) arranged in the flow duct (16) and having a valve body (19) having an inner space (20) for receiving a pig (21) through an inlet opening. Further, the device comprises a pig transfer valve (26) arranged in the branch duct (17) and having double seals (31) between the pig receiver valve (18) and the pig chamber (27), and a passage (45) arranged in the housing (15) for introduction of an operating rod (46) for transferring a pig (21) from the pig receiver valve (18) to the pig chamber (27) or vice versa. The passage (45) is connected to an additional valve (47) which has also double seals (51) against the outside of the device (10).