Troubleshooting Trunnion Ball Valves

Trunnion ball valves are widely used in piping systems all over the world, and have typically been used for pipes built for residential, commercial and industrial purposes. They are quite durable, and can go on for many years, if properly installed and maintained. However, care needs to be taken that you are in a position to understand the dimensions of the problems that may arise in regards to these devices.

After identifying the symptoms or the possible faults with the equipment, you can use the tips and recommendations explained below, to go about troubleshooting any issue that may damage the functionality of your trunnion ball valves. However, if you are sill experiencing leaks after following through the below tips, then you should get professional help.

Tip 1: Leakage

If you identify leakage from ball seat, it may be because the ball seat is damaged. This might require that you replace the ball seats and install a replacement valve. On the other hand, perhaps the valve has been installed on the piping in the wrong direction, which can be resolved by installing it in the appropriate direction, once the valve has been closed. Thermal expansion over time can also result in leaks. If leakage occurs through a closed valve, the problem might be with the ball surface, seats or the position of the ball. Hence, if you are unsure, then inspect all these parts and replace the ball, or the seats, and check ball opening and closing settings.

Tip 2: Irregular Ball Movement

If you detect irregular ball movement, it may be caused by impurities or dirt, stuck between the ball and seat, or the ball cavity and ball seats. This can be easily resolved by flushing the ball from the inner side, and cleaning the sealing surfaces as well as the seats.

Tip 3: Valve Too Tight

If you encounter the problem of the valve being too tight for operation, or the valve torque is too high, it may be because off damaged ball seats, high application of pressure or temperature, or the existence of foreign particles in the valve. This can be sorted out by replacing the seat, confirming the applicable pressure/temperature rating and cleaning the terminals to remove any possible impurities.

Tip 4: Water Hammer or Noisy Operation

If you face the problem of water hammer, or noisy operation, an error might be present in the valve size, or the flow or fluid with an eccentrically high velocity. For this issue, confirm the valve sizes with respect to the flow of liquid material and make changes, if necessary.

Tip 5: Ineffective Limit Switch

If the limit switch shows problems in operation, it may be because of improper wiring or leakage inside the limit switch, for which you should check the wiring and repair it, or because of an incorrect position of the striker, for which re-consider the settings of the striker position and tighten the fixing bolt of the striker itself.