How to Replace Valve Trim

Replacing valve trim is a simple and cost-effective option when compared to replacing an entire valve.  There are two primary reasons to change your valve trim:

  1. Your process flow rates have changed so that the original valve trim is no longer sized correctly
  2. You have worn out the trim in your valve

In this video, Kimray Account Manager Kyle Andrews demonstrates how to change out the valve trim on Kimray two-inch High Pressure Control Valve.

How to Remove Valve Trim

  1. Unthread and remove the adjusting screw.
  2. Unthread and remove the bolts on the coupling block.
  3. Unthread and remove the four body bolts holding the topworks on.
  4. Remove the topworks.
  5. Unthread and remove the stuffing box from the valve body. This should come out as one assembly.
  6. Place the stuffing box into a vice, clamping on the flats.
  7. Unthread and remove the seat from the stuffing box.
  8. Remove the ball and stem. You may need to use a wrench to pry the ball up.

How to Install Valve Trim

  1. Install the new ball and stem using a rubber mallet.
  2. Grease the o-ring on the new seat.
  3. Thread on the new seat and tighten.
  4. Thread the stuffing box assembly into the valve body.
  5. Replace topworks.
  6. Get the body bolts started, but do not tighten fully.
  7. Put the coupling block back on. Make sure to replace the travel indicator with indicator included with the replacement trim.
  8. Tighten the body bolts fully.
  9. Tighten the adjusting screw.

Now that you’ve changed the trim size and your control valve it’s ready to handle your new flow conditions.

Kyle Andrews is an Account Manager at Kimray. Connect with him on LinkedIn or by email at