Patent ID: 11898649
Assignee: ROSEN SWISS AG
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  B  G | IPC B  F  G

Claim 0:
1. A bypass valve for an inspection and/or cleaning pig for a pipeline through which a medium flows, the bypass valve comprising:
an inner space which is provided with a flow profile and in which there is arranged a piston which is movable in a longitudinal direction of the bypass valve via a force storage medium in a pressure-dependent manner;
wherein the piston moves between a first open position of the bypass valve which creates a bypass for the medium, and a second position at higher differential pressure, said second position at least substantially closing the bypass,
wherein the piston can be further moved from the first position via the second position in the same direction to a third, maximum position at a critical opening pressure which opens the bypass again,
wherein a flow cross section released in the maximum position is smaller than a flow cross section present in the first position, but is larger than a flow cross section present in the second position of the piston.