Internal leakage in different types of valves

Generally, internal leakage occurs when a valve does not close properly; this might be due to the presence of foreign objects, defects in the valve core or sealing surfaces (though this is less likely), or damage to the sealing surfaces. It is difficult to say whether ball valves or gate valves are more prone to internal leakage – it depends on the actual operating conditions. The choice between a ball valve and a gate valve is not based on which type is more likely to leak, but rather on economic factors and design considerations such as size, pressure, and the type of medium. For example, if the valve needs to remain open or closed for extended periods, a gate valve is usually a better choice as it offers better cost-effectiveness. If the valve needs to be opened and closed frequently, then a ball valve is more suitable. This is because ball valves operate with angular motion, while gate valves operate with linear motion – and this is the main difference between the two

First of all, valves are not selected based on their internal leakage rate; rather, they are chosen according to the operating conditions. Different valves have different applications, so it cannot be said that one type of valve is more prone to leakage

I think what the original poster meant was to say that it was leaked, right? Internal leakage is not allowed when a valve leaves the factory! ! !

Gate valves are generally used in applications that require long periods of either open or closed operation, and they are commonly employed for pipe diameters of DN150 and above. However, over time, due to corrosion by the medium or effects from the external environment, it can happen that the valve cannot be fully closed； Butterfly valves have a Teflon layer as the sealing surface, which provides a certain level of corrosion resistance. However, if the water quality is poor, hard particles can damage the sealing surface, leading to situations where the valve cannot be closed properly. Ball valves are commonly used for diameters of DN200 and above; they offer good sealing performance, but they need to be opened and closed frequently, otherwise they are prone to rusting and becoming stuck

All valves will experience internal leakage; it’s just a matter of how long it takes. The most important thing is to choose a manufacturer of good quality; such products generally will not experience internal leakage during their usage period. If a lower-quality product is chosen, internal leakage may occur within a month or even sooner.

There are many reasons for internal leakage in valves, mainly internal factors such as incorrect selection, poor quality, unreasonable design, and substandard sealing materials, as well as external factors such as harsh operating conditions, improper opening and closing, installation scratches, and rough or incorrect handling. If it’s not a real seal damage. Internal leakage can be resolved simply by tightening and adjusting the valve. If it is a genuine seal damage, the best solution is of course to stop the machine, replace the seal or the valve. If it cannot be stopped/failed to stop, repair must be carried out online while under pressure; there is a certain success rate for such repairs, and even professional teams cannot guarantee a 100% successful fix. In companies with advanced technology, once online repair is successful, the valve can be opened and closed freely, and its functional performance returns to its original state. If you want relevant information, please send me a message within the platform so we can all improve together.