Valves for crystallization conditions
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The customer is using ball valves for discharging material at the bottom of the reactor; the medium contains crystals. The valve diameters are DN125 and DN150, and the valve material is 304. Is there any good technical solution? Many domestic valves have been used, but they break down after just a few months
Use a V-type ball valve (specifically designed for use with viscous fluids containing solid particles), or a gate valve
Try to provide detailed information on the operating conditions of the medium; based on this, a new selection can be made. The cutting capacity of ordinary O-ball valves is not as good as that of V-ball valves
The solution that some manufacturers are offering to their customers now is to coat the ball and valve seat with tungsten carbide, or use O-rings instead; will this work?
Take a look at http://bbs.hcbbs.com/thread-1320253-1-1.html; coaxial valves are used for media containing particulate impurities. I’m not sure what the requirements are for other parameters in your process
The problem can be solved using a V-type ball valve; the ball is coated with hard chromium
How do crystals form? Does the crystallization occur in the material itself, or only at low temperatures? The operating conditions must be as detailed as possible
Crystallization occurs as a result of increased concentration. There are coils in the reaction vessel through which steam is passed to heat the medium; once the medium becomes concentrated, crystals form. These crystals accumulate at the bottom of the reaction vessel, as well as on the ball of the ball valve and within its flow channels. When opening or closing the valve, it is necessary to use the valve seat to scrape off the crystals from the ball so that the valve can function properly. However, the medium must not reach the sealing surface; if crystals do get there, the ball valve will become stuck. Therefore, these ball valves present certain challenges. Some manufacturers have proposed coating both the ball and the valve seat with tungsten carbide – would this solve the problem? I hope experts can respond. The key question is whether anyone knows about actual applications of these valves in situations involving crystallization, or has experience using them under such conditions. Currently, customers are looking for well-known domestic manufacturers
Stopcock for easy crystallization. Please provide me with the detailed technical parameters such as the medium’s crystallization temperature, density, melting point, flow rate, and other operating conditions, and I will help you select the appropriate option.
No one has clearly specified whether tungsten carbide can be sprayed on ball valves before use; does that mean ball valves cannot be used?
Is there any reputable domestic manufacturer that can answer whether ball valves can be used?