How to Convert a Gas Regulator from Vent to Non-vent

A back pressure regulator is a specific type of control valve that holds pressure on production vessels such as separators, treaters, and free water knockouts and releases upstream pressure when a designated set point is reached.

When a gas back pressure regulator is operating correctly, it vents pressure off the diaphragm as it adjusts. However, some producers need to convert the regulator from venting to non-venting. 

You may need to do this if you are using the regulator inside a building, facing increased emissions regulations, or for safety concerns.

In this video, Troy Schrader shows you how to convert this gas regulator from vent to non-vent. You can find step-by-step instructions below.


Parts Needed

These are the parts you will need for this process:

  • tubing benders
  • tubing cutters
  • two two-quarter-inch steel tubes at least nine inches long each
  • a connector
  • tee
  • elbow
  • primer
  • Loctite
  • grease
  • adjustable wrench
  • 9/16th” wrench
  • socket wrench

Check with your local Kimray distributor to order the exact parts for your size valve.


How to Convert a Gas Regulator from Vent to Non-vent: Disassembly 

  1. We’re in a controlled environment for the video, but if you are doing this in-line, you will need to isolate and depressurize the valve first.
  2. If you’re using a vice, mount it slightly off center so that when it comes times to install the new elbow, you’ll be able to attach it without adjusting the valve.
  3. Unthread the adjustment bolt to relieve the spring pressure.
  4. Loosen the tubing.
  5. Remove the bonnet bolts, but leave them in place to keep the assembly from coming apart.
  6. Remove the tubing from the body and rotate it 90 degrees so that you can prop the pilot housing assembly upright and not damage the pilot plug.
  7. Inspect the diaphragm for damage. If it’s damaged, it will need to be replaced.
  8. Loosen the bolts on the upper housing and set it aside.
  9. Inspect this diaphragm for any damage and replace it if needed.

How to Convert a Gas Regulator from Vent to Non-vent: Re-assembly 

  1. Rotate the lower housing so that the vent plug is 90 degrees from both inlets.
  2. Inspect the lower housing gasket for for damage. [ NOTE: Don’t tip the lower housing because it has oil in it.]
  3. Apply new grease to the gasket.
  4. Rotate the upper housing vent plug 90 degrees to the downstream side.
  5. Verify that the lower diaphragm is positioned correctly.
  6. Hand-start the bolts through the upper housing into the body and tighten in a criss-cross pattern.
  7. Install the pilot housing assembly back on to the upper housing, making sure the 110 diaphragm is not pinched or off center.
  8. Insert the tubing into the elbow on the body, but do not tighten it yet.
  9. Tighten each bonnet bolt gradually, so that as it seals, pressure on the diaphragm is applied evenly.
  10. Now you can tighten the tubing connectors.
  11. Remove the vent plugs from the upper and lower housings. Make sure that the ferrules on both ends of the new connector are still installed.
  12. Apply primer and Loctite to the tee threads and install it into the lower housing.
  13. Apply primer and Loctite to the connector and install it next.
  14. Remove the plug on the downstream side of the body and apply primer and Loctite to the elbow.
  15. Install it so that the tube connection is facing the upstream outlet.
  16. After bending and cutting your tubes, be sure to pre-install the ferrules by tightening the nut to the connector with the tube firmly inserted.
  17. Remove the tube to inspect that the ferrule has attached correctly.
  18. Install the tubes.
  19. Lastly, correct your adjustment bolt on top for your desired set point.

Now your gas regulator is non-venting. If you have any questions about this process, contact your local Kimray store or distributor.


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Troy Shrader serves as a Product Manager at Kimray. He collaborates with Kimray’s engineering, manufacturing, and quality teams to optimize the performance of our products and make a difference for our customers.