Why Reverse the High Pressure Control Valve?
Do you need to reverse the function from fail open to fail close for a different application?
For example, maybe you have been using a the valve as a suction controller on the inlet of a compressor. In this case you had it set to fail open.
Now you want to use it for back pressure service, to hold pressure on a three-phase separator—in which case you would want the valve set up to fail open.
In this 3-minute video, Jason shows you how to convert the topworks on a Kimray High Pressure Control valve from fail closed to fail open. You can also find the steps below:
How to Reverse the High Pressure Control Valve fail position
- Step 1: Remove the upper adjustment screw and bonnet bolts.
- Step 2: Remove the bonnet, upper spring plate, spring, and lower spring plate.
- Step 3: Before you loosen the coupling block, put a wrench on the flats of the upper stem. Then loosen the diaphragm plate. Next, put your fingers underneath the diaphragm and diaphragm plate and lift up to get your lower stem in the right position.
- Step 4: Remove your coupling block.
- Step 5: Put your fingers underneath the diaphragm and diaphragm plate to remove the upper stem. Then rotate the diaphragm plate back and forth so that you don’t shear the o-ring in the lower adjustment screw when you’re pulling the stem out.
- Step 6: Remove the upper stem.
- Step 7: Reinstall the upper stem into the other side of the pivot sleeve.
- Step 8: Take the pivot off of the upper adjustment screw. Then install it on your lower adjustment screw with the beveled side facing up.
- Step 9: Install the lower spring plate, spring, and upper spring plate.
- Step 10: Before sliding the upper stem back through the lower adjustment screw, put a dab of grease on it to prevent damaging the o-ring in the lower adjustment screw.
- Step 11: Be sure that you install the coupling block where both of the flat side surfaces are facing up and that you change your indicator plate from pressure open to pressure closed - the same as changing from fail closed to fail open.
- Step 12: Before your re-install the bonnet, make sure that the diaphragm lines up with the bolt holes.
- Step 13: Re-install all of your bonnet bolts.
- Step 14: Once all of your bonnet bolts are tightened, you can reinstall your upper adjustment screw.
- Step 15: Move the breather plug from the top side of the actuator to the bottom side.
That’s how to convert the topworks on a High Pressure Control Valve for a different application.
To speak with an expert about converting your control valve's fail position, contact your local Kimray store or authorized distributor.