INDUSTRY APPLICATIONS
INDUSTRY APPLICATIONS
Technical Selection Scheme for Bottom Valve
I. On-site Application Conditions Introduction
On-site conditions: Bottom discharge of tank
On-site working medium: Mixed reaction materials, with viscosity and corrosiveness. One tank reacts two materials separately;
Characteristics of the first material: Does not flow easily at low temperatures, prone to crystallization and solidification, blocking pipelines. (Reaction temperature 180℃)
Characteristics of the second material: Does not flow easily at high temperatures, prone to crystallization and solidification, blocking pipelines (cooled to around 40℃).
On-site operating temperature: Room temperature ~ 180℃
On-site valve usage: Valves show internal leakage after a period of use.
Preliminary judgment of the causes of valve leakage:
1. Damage to the sealing surface and crystallization on the sealing surface lead to valve leakage.
2. Crystallization or material accumulation around the valve stem, wear on the valve stem surface, resulting in increased valve opening and closing torque, and possibly incomplete closure.
II. Problems and Challenges Faced
1. Because the medium is prone to crystallization and solidification, and contains solid particles, and the temperature is high, it is necessary to solve the wear resistance and the impact of abnormal increase in valve torque on the valve stem, and the most important thing is to prevent the medium from crystallizing and solidifying.
III. EICMATION's Recommended Solution (as shown in the figure)
Our company suggests that the valve still uses the top-discharge valve, but the structure is optimized as follows:
First, the sealing surface is hard-faced with STL hard alloy, with a thickness ≥3mm, ensuring that the sealing surface is not easily detached and has a longer wear-resistant time. (Solves the problem of valve leakage caused by sealing surface damage)
Second, the valve stem uses austenitic stainless steel XM-19, which has better wear resistance and corrosion resistance than ordinary stainless steel, and its strength is 3-4 times that of 316. XM-19 has good mechanical properties in both high-temperature and low-temperature environments. (Solves the problem of valve stem wear.)
Third; the valve is changed to an insulated and jacketed type, effectively solving the problem of material solidification blocking the normal opening and closing of the valve, and also solving the problem of material solidification adhering to the sealing surface, causing the valve to not close tightly.
Existing problems:
Due to different mold angles of valves from different manufacturers, if our company's scheme is adopted, the existing on-site pipelines need to be modified, and the pipeline angle needs to be readjusted to ensure the installation of the new valve. The specific angle dimensions are shown in the figure below (connection angle 50 degrees).
Attachment: Model; KPK44M3623-NB24BD120 (DN150*150) with insulation and jacket
More Industry Applications
AISENBERG GmbH
Tel: +49 02161 3046062
E-mail: info@eicmation.de
Address: Willicher Damm 129, 41066 Mönchengladbach, Germany
China Headquarters: Eic (Shanghai) Pipeline Control System Co., Ltd.
Tel: +86 021 6380 85731
Email: info@eicmation.com
Address: 16F, Changhui Building, No. 799, Yinxiang Road, Jiading District, Shanghai
China Factory: Eicmation (Jiangsu) Fluid Control System Co., Ltd.
Tel: 400-670-1280
Email: info@eicmation.com
Address: North Shengye Road, Valve Industrial Park, Nanyang Town, Dafeng District, Yancheng City, Jiangsu Province
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