Hi, I'm Will with Kimray, where we help energy producers solve the biggest
control challenges. Today I'm going to show you how to convert a back pressure
regulator from vent to non-vent. When a 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're using the regulator inside a building, facing increased
emissions regulations ,or for safety concerns. These are the parts you'll need:
If you're using a vise, mount it's slightly off-center so that when it comes time to
install the new elbow you'll be able to attach it without adjusting the valve.
First, unthread the adjustment bolt to relieve the spring pressure. Then loosen
the tubing. Remove the bonnet bolts but leave them in place to keep the assembly
from coming apart. Remove the tubing from the body and inspect the diaphragm for
damage. If it's damaged it will need to be replaced.
Rotate the tubing 90º so that you can prop the pilot housing assembly
upright and not damage the pilot plug. Loosen the bolts on the upper housing
and set it aside. Inspect this diaphragm for any damage
and replace it if needed. Inspect the lower housings gasket for damage but
don't tip it over because it has oil in it. Apply new grease to the gasket. Rotate
the lower housing so that the vent plug is 90º from both inlets. Rotate
the upper housing vent plugs to the downstream side.
Verify that the lower diaphragm is positioned correctly. Hand start the
bolts to the upper housing into the body and tighten in a crisscross pattern.
Install the pilot housing assembly back onto the upper housing, making sure that
the diaphragm is not pinched or off-center. Insert the tubing into the
elbow on the body but do not tighten it yet. Tighten each bonnet bolt gradually
so that the pressure on the diaphragm is applied evenly. Now tighten the tubing
connectors. 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. Apply
primer and Loctite to the T threads and install it into the lower housing.
Next, apply primary Loctite to the connector and install it. Remove the plug
on the downstream side of the body and apply primer and lock tight to the elbow.
Install it so that the tubing connection is facing the upstream outlet. Now we'll
be installing the tubing. After bending and cutting your tubing, be sure to
pre-install the ferrule by tightening the nut to the connector with the tube firmly
inserted. Then remove the tubing to inspect the ferrule has attached
correctly. Now you can install the tubing.
Lastly, tighten your adjustment bolt on top for your desired set point. Now your
regulator is non-venting. If you have any questions, contact your local Kimray store or distributor.