Patent ID: 11970915
Assignee: WEATHERFORD TECHNOLOGY HOLDINGS, LLC
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 18:
19. A tubular handling system for handling a tubular, comprising:
a tubular gripping apparatus having a plurality of gripping members for gripping the tubular;
a tubular lifting apparatus configured to axially move the tubular;
a first fluid line for opening the gripping members, the first fluid line having a one-way valve;
a second fluid line for closing the gripping members;
an indicator assembly attached to the housing, the indicator assembly having:
an indicator movable relative to the tubular gripping apparatus; and
a sensor valve configured to open the one-way valve for fluid communication through the first fluid line in response to relative axial movement between the indicator and the tubular gripping apparatus; and

a memory valve configured to maintain the one-way valve open for fluid communication.