.~ With controllable passage between central chamber and space below packer {7}
145
.~.~ Bypass closing and passage opening to upward flow constrained to occur simultaneously
DEFINITION
Classification: 166/145
(under subclass 142) Devices in which there is a bypass around the packer and a valve or closure for the bypass, the control element for the passage being so interconnected with the valve or closure for the bypass that complete opening of the passage to upward fluid flow into the central chamber and closing of the bypass to upward fluid flow are constrained to occur together.
(1) Note. A bypass is a passage through the packer that connects the annular space outside the central conduit or receptacle and above the packer with the space below the packer.
(2) Note. The closing of the bypass and opening of the passage need not occur exactly simultaneously but may occur a short time interval apart as the result of an operating movement which is intended to take place without interruption once started.
