Why is none of the condensate discharged or the discharge is poor (blocked)?

a. Float is damaged or filled with condensate

To do:

1. Replace with new float

b. The float is sticking to the valve seat

To do:

1. Need cleaning

c. Orifice, screen or piping is clogged with rust or scale

To do:

1. Replace with new float

d. Steam-locking has occurred

To do:

1. Blowdown through the bypass or close the trap inlet valve and allow the trap to cool

e. Flow exceeds traps rated capacity

To do:

1. Check specifications and reselect trap suitable for actual flow

f. The trap operating pressure exceeds the maximum specified pressure, or there is insufficient differential pressure between the trap inlet and outlet

To do:

1. Compare specifications and actual operating conditions

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 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

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

 

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

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

Why is the none of the condensate discharged?

a. The primary pressure exceeds the trap valve seat maximum working pressure

To do:

1. Check the primary pressure
2. Change to a suitable pressure

b. Water inside the float

To do:

1. Check the float
2. Replace with a new float

c. Output piping is clogged

To do:

1. Check the output piping
2. Clean or modify the piping

d. The trap valve seat is clogged

To do:

1. Check the trap valve seat
2. Clean or replace with a new trap valve seat

Why is the steam blowing?

a. There is a build-up of dirt on the trap valve seat or on the float

To do:

1. Check the trap valve seat and the float
2. Clean or replace

b. The Body is installed tilted

To do:

1. Check the installation conditions
2. Correct the installation

c. The float is deformed

To do:

1. Check the float
2. Replace with a new float (Inspect for water hammer or freezing)

d. There is vibration in the piping

To do:

1. Check the piping conditions
2. Remove the source of the vibration or reinforce the piping supports

What makes the valve travel unstable?

a. The setting of the controller is faulty

To do:

1. Check the set value based on the controllers PID parameters
2. Adjust the controllers setting values

Why does the valves open and close too slowly?

a. There is water or oil inside the positioner

To do:

1. Check to see if there is water or oil entrained in the air supply
2. Replace with a new positioner/actuator unit and improve the quality of the air supply

b. The filter regulator is clogged

To do:

1. Check the filter
2. Clean the filter or replace with a new filter