Mining Ball Valves Manufacturers introduce solutions to poor valve sealing performance:
1) Grinding method
Fine grinding, eliminate marks, reduce or eliminate the sealing gap, and improve the finish of the sealing surface to improve sealing performance.
2) Using the unbalanced force to increase the sealing specific pressure method
The sealing pressure generated by the actuator to the valve core is constant. When the unbalanced force has a tendency to open the valve core, the sealing force of the valve core is the subtraction of the two forces. The addition of the two forces greatly increases the sealing specific pressure, and the sealing effect can be increased by more than 5 to 10 times compared with the former. Generally, the single-sealed valve with dg≥20 is the former case, which is usually a flow-open type. When the sealing effect is not satisfied, change to the flow-closed type, and the sealing performance will be doubled. Especially the two-position cut-off control valve should generally be used as the flow-closed type.
3) Improve the sealing force of the actuator
Improving the sealing force of the actuator to the valve core is also a common method to ensure the valve is closed, increase the sealing specific pressure, and improve the sealing performance. Commonly used methods are:
①The working range of the moving spring;
② Use small stiffness springs instead;
③Add accessories, such as with locator;
④Increase the air source pressure;
⑤ Use an actuator with a larger thrust.
4) Adopt the single seal and soft seal method
For the control valve used with double seals, the single seal can be used instead, which can usually improve the sealing effect by more than 10 times. If the unbalanced force is large, corresponding measures should be added. More than 10 times the sealing effect.
5) Switch to a valve with good sealing performance
If necessary, consider changing to a valve with better sealing performance. For example, if you change the ordinary butterfly valve to an oval butterfly valve, you can also use a cut-off butterfly valve, an eccentric rotary valve, a ball valve, and a specially designed cut-off valve.