Ammonia pipeline valves
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I would like to ask everyone: what kind of valves should be used for the ammonia pipelines produced by urea hydrolysis? (Temperature: 130–160°C, pressure: 0.4–0.6 mPa). Previously, ammonia stop valves were used for ammonia pipelines with temperatures below 150°C. However, according to the standards, ammonia stop valves are suitable only for temperatures below 150°C. So, what kind of valve should be used for ammonia pipelines with higher temperatures like this? It would be best to have a specific valve model, thank you! ! !
I’ve seen promotional materials from some valve manufacturers, which state that when polytetrafluoroethylene is used as the material for the sealing surface of ammonia valves, the maximum allowable temperature is +200°C.
The last edit to this post was made by Thank goodness you're here on 2016-7-5 at 09:41. Introduction to AJ45B-40C ammonia shut-off valves: These are shut-off valves made of babbitt, designed specifically for use with ammonia gas. They represent a series of products designed to meet the special requirements associated with the transportation of ammonia gas and liquid ammonia, taking into account the actual conditions of valve usage in China. These valves feature innovative sealing methods and reliable sealing structures. This type of valve features stable sealing performance, safe and reliable operation, strong corrosion resistance, no internal or external leakage of the medium, and easy operation. It effectively solves the problems associated with conventional valves used in chemical pipelines, such as poor corrosion resistance, easy perforation of the casing, and poor sealing leading to leaks. It is particularly suitable for transporting chlorine and liquid chlorine in the chemical industry, meeting the requirements for long-term reliable use. Its sealing performance, maintainability, safety, etc. Product features of the AJ45B-25C ammonia stop valve: 1. To address the issues of poor corrosion resistance and easy perforation of conventional valves, this valve designed specifically for ammonia uses corrosion-resistant steel in its construction – carbon steel to which corrosion-resistant alloy elements have been added. It can withstand the corrosion caused by ammonia gas and liquid ammonia, and can operate at low temperatures down to -40°C, thus meeting the requirements of various operating conditions to the greatest extent possible. 2. The sealing pair configuration for valves designed for ammonia uses ball or planar types, enabling automatic sealing compensation and thus providing dual protection. The sealing performance is stable, with no adhesion-related wear, effectively addressing the problem of poor sealing performance and frequent leaks in ordinary valves used in chemical pipelines. 3. The flanges in the product feature a tenon-and-socket sealing structure, ensuring absolutely reliable sealing of the middle flanges even in the face of fluctuations in pipeline pressure. 4. The upper sealing device uses multi-layer polytetrafluoroethylene sealing material to create a combined seal, ensuring no leakage of medium from the stuffing box during the valve’s service life. This eliminates the problem associated with ordinary valves, where the stuffing box sealing is weak, allowing medium to leak out and even leading to accidents. Product standard for AJ45F-25 ammonia stop valve ※An enterprise standard formulated on the basis of GB/T12235 standard. The enterprise standards are formulated entirely based on the corrosion characteristics of chlorine and liquid chlorine, as well as the requirements of operating conditions, in terms of material selection and structural design; all technical parameters meet standards that are superior to those set by national standards.
This post was last edited by Thank goodness you're here on 2016-7-5 09:44. Ammonia stop valve ♀ Liquid ammonia stop valve ♀ Ammonia gas stop valve. Model: AJ41F-40C; Specifications: DN15-200; Structure: Hidden stem with reverse sealing. Product description: The Ammonia stop valve ♀ Liquid ammonia stop valve ♀ Ammonia gas stop valve is designed specifically for pipelines or systems involving ammonia gas and combustible gases. Fire protection requirements were taken into account in the structure. Polytetrafluoroethylene is used as the filler, ensuring reliable sealing with absolutely no external leakage. Polytetrafluoroethylene is used as the filler, ensuring reliable sealing with absolutely no leakage. The sealing surface material is polyfluoroethylene or nylon; it forms a soft seal with the valve body material, ensuring reliable sealing. Suitable for pipeline systems as a closing device, and also applicable to other gas pipelines with temperatures ≤80°C. Performance specifications: Nominal pressure PN (MPA), Test pressure PS (MPa), Applicable media, Applicable temperature (°C): Ammonia, ammonia solution, etc. NH3; Babbitt alloy: -40°C to +150°C; Teflon: -40°C to +200°C. 4.0 6.4