Why does the Valve not open at the specified differential pressure?
a. Sticking valve and valve seat due to rust, pipe sealing agent, etc.
To do:
1. Clean the parts
Why can I hear the sound of the flow when the outlet pressure is higher than the inlet pressure?
a. Dirt or damage on sealing surfaces
To do:
1. Clean the parts
b. The valve disc is catching due to wear, dirt, rust etc.
To do:
1. Replace the check valve
c. The coil spring is dislodged or broken
To do:
1. Replace with a new coil spring
d. The spring holder dislodged or broken
To do:
1. Replace the check valve
How to fix a defect check valve?
a. Check valve clogged
To do:
1. Check that valve opens for condensate draining
2. If not, then clean valve
b. Check valve corroded
To do:
1. Check visual signs of significant corrosion
2. Replace valve if corroded
c. Check valve spring defective
To do:
1. Check if spring is broken
2. Replace spring if broken
d. Check valve capsule (body) defective
To do:
1. Check that check valve does not leak steam into the drain system – by mounting a pressure gauge in the drain-pipes (pressure must be below 1Bar)
2. Replace drain valve capsule in case valve is leaking
What to do to a Leakage on the outside of the check valve?
a. The union gasket is warped or damaged
To do:
1. Replace with a new gasket
b. Incorrect union tightening torque
To do:
1. Tighten to the proper torque
c. The check valve is subject to stress from the piping (weight, torsion, etc.)
To do:
1. Correct the piping
Why is the flow at the check valve poor?
a. The valve disc is catching due wear, dirt, rust etc.
To do:
1. Clean the parts
b. Incorrect operating pressure
To do:
1. Adjust by increasing the pressure or replace with new check valve that has a large Cv value
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