Fluid flow control devices.

摘要

A fluid flow control device has a collapsible flow conduit 53 which is responsive to pressure difference between the interior and exterior of the conduit to collapse when the difference is too large. In one form the exterior is defined by a chamber open at an upstream end and closed at a downstream end. The device may be used as a sleeve at the inlet and outlet ends of tubes in a tube and shell heat exchanger to restrict flow in the event of a tube breach; in this case the exterior of the conduit is defined by a header chamber. The conduit may be a Venturi or flattened at a free outlet end and may have a wall which increases in thickness away from a free end.