Use care not to damage the upper box shoulder during this process.

Unscrew the upper body from the lower body and turn it over to rest on its upper box ( use care to set the box on something that will not damage the shoulder). Wipe out the seat pocket. Wipe off the new seat, fit the seat into the pocket (do not lubricate seat and seat pocket), lay a board over the face of seat and strike the board with the same hammer used to remove the old seat (See Figure 8).

Figure 8

Dope the center connection ( box and pin) and then install the dart and spring together. IBOP's of 2-3/8" and 2-7/8" sizes have a spring retainer at the bottom of the spring. Make sure to install this retainer in these sizes with the retainer properly inserted into the spring end. You may find this most easily done with the lower body lying on its side (See Figure 9 for illustration).

DART, SPRING AND
SPRING RETAINER INSTALLATION

Then screw the upper body into the box of the lower body by hand as far as it will go. Occasionally, the body O-ring resists going into the box counterbore, generous doping and slow turning during the last 1/4" of make-up usually eases the O-ring into the counterbore. On rare occasions you may have to work the O-ring into the counterbore of the lower body by hand using a dull-edged screwdriver or similar instrument.

When made-up shoulder-to-shoulder, tighten center connection to the Torque values listed in Table 3.

Test the IBOP below the dart to 10,000 psi twice, and once at low pressure, with the box end left open to observe the seal of the dart.

NOTE: Do not look directly into the upper box during test. Use a mirror to visually observe and always wear safety glasses.

Re-install the assembled release tool into the cleaned and doped upper box to complete repairs.

Pull on the installed seat by hand, it must not pull free by hand.

NOTE: A WOODCO USA seat has a shoulder at its major O.D. to limit downward movement into the seat pocket.  New seats installed in undamaged seat pockets should have a standoff (gap) between the pin end and the seat shoulder of 1/16" to 1/8" when installed by hand. Do not attempt to drive the seat until the shoulder and pin end meet. Test or service pressure will force the seat to its final tight position.

Replace both the dart O-ring and the body O-ring at every disassembly, whether they appear damaged or not.

NOTE:  Obtain  replacement  O-rings  from WOODCO USA to assure the O-ring will perform properly at rated temperatures and in hostile fluid environments.