Patent ID: 11892861
Assignee: BAKER HUGHES OILFIELD OPERATIONS LLC
Field: Control (Instruments)
Classification: CPC G  E | IPC E  G

Claim 14:
15. A wellbore tool comprising:
a housing;
a filter disposed at the housing to allow filtered fluid to pass within the housing;
a pilot valve in the housing having a moving member and responsive to fluid density or viscosity of the filtered fluid;
a primary valve in the housing configured to change in position in response to a change of position of the pilot valve; and
a first chamber and a second chamber, the primary valve being exposed at on operational end thereof to the first chamber and at an opposite operational end to the second chamber, the primary valve responsive to pressure differential between the first and second chambers, wherein pressure in the second chamber rises when the pilot valve changes from a more open position to a more closed position, during use.