Doc No: OMM50001243
Rev: C Page 37 of 68
This document and all the information contained herein are the confidential and exclusive property of TechnipFMC,
and may not be reproduced, disclosed, or made public in any manner prior to express written authorization by TechnipFMC.
This style of tool includes a disc that passes through the seat to allow tension to be
placed underneath it. The disc has a threaded hole that is at the center of the disc
(concentric disc). A tension rod is threaded into the hole. The second disc has an
eccentric hole with clearance for the tension rod and sits on top of the threaded disc.
This keeps the threaded disc engaged with the edge of the seat.
Figure 10: Eccentric Disc in Use
The tension rod is located through the top of the fluid cylinder and through a strong back
that rests on the top of the fluid cylinder. A nut is threaded over the tension rod and
tightens down on the strong back. The nut is tightened to place tension in the rod,
putting upward pressure on the seat of the fluid cylinder.
A bumper is placed over the tension rod with a nut stop above the bumper. With the nut
on the strong back torqued (tensioning the rod), the bumper is moved rapidly upward
striking the retaining nut. This imparts a shock load into the seat. This sequence is
repeated until the seat pops loose from the fluid cylinder.
Tension Rod
Valve Seat, (shown removed from the
Fluid Cylinder)
Threaded Disc
Eccentric Disc
