In black water media, control valves will get stuck due to scaling if they are in use for an extended period of time

What are the diameter and pressure? Have you used ceramic V-ball valves? The 412372706 V-type electric ceramic control ball valve features equal percentage flow control (logarithmic) characteristics; it does not experience hunting when operated at low opening degrees, and its oscillation mechanism provides fine-tuning functionality. It can meet the requirements for regulating low flow rates. Moreover, its operating status is very stable. Flow regulation of the medium can be performed more precisely and flexibly. It features a wide adjustment range, fast tuning speed, simple maintenance, and low cost. Moreover, structural ceramics possess excellent self-cleaning properties. During opening and closing, the V-shaped channel of the ball interacts with the valve seat through a wedge-shaped shearing action, which breaks down and removes fibers, solid particles, and other impurities in the fluid, thereby preventing the ball core from getting stuck. This makes them particularly suitable for use in situations where pipelines suffer from scaling and freezing. Suitable for controlling pulp, wastewater, suspension media containing fibers and particulate solids, as well as powdery media. ▪ The parts in contact with the medium are all made of structural ceramic materials, which possess extremely high chemical stability and hardness (Rockwell hardness HRC 88), second only to diamond. Therefore, this valve boasts extremely high wear resistance, corrosion resistance, and erosion resistance, as well as good thermal insulation and a low coefficient of thermal expansion. It is mainly used in industrial fields such as electricity, petroleum, chemicals, metallurgy, mining, and sewage treatment, and it demonstrates its excellent performance especially under harsh conditions such as high wear, severe corrosion, and high temperatures. ▪ This valve is suitable for use in pipelines containing highly hard particulate media, or media with soft particles but also corrosive properties, for opening and closing purposes. Nominal pressure PN10~PN40, suitable temperature ≤200°C. It can be manufactured in accordance with standards such as GB, JIS, and API.

With a pressure of 150 pounds and a diameter of DN200, even ceramic V-ball valves can experience structural jamming. When such a valve gets jammed, forcing it open manually can cause the ball core to break. A scraping-type seat seems to offer little benefit in this case; it’s likely that your valve is a floating ball valve. What is the floating clearance? Even when the valve is closed, structural issues can still occur

The key lies in the water quality management of Black Water, and efforts need to be made in this regard.

What you say makes sense – addressing the problem at its source is the way to go. But for now, it seems that the company’s management has no such intention