.~ With controllable passage between central chamber and space below packer {7}
148
.~.~ Upwardly biased check valve and means for opening or bypassing it
DEFINITION
Classification: 166/148
(under subclass 142) Devices in which there is a check valve normally effectively closing the passage against upward flow of fluid while the device is being run into the well but permitting downward flow and there is also a means for rendering the check valve ineffective to stop upward flow after the device is positioned in the well, either by opening said valve or providing a fluid passageway around said valve.
SEE OR SEARCH CLASS
137, Fluid Handling,
599+, for distribution systems with valves in which flowing material is divided into parallel flow paths and recombined.
