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

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