fluorine lining gate valve

The working principle of the upward discharge valve

by:Lianke Valve     2022-07-31
The performance and use of the upward-spreading discharge valve: the operation is convenient, the opening is free, the movement is flexible and reliable; the valve disc is easy to assemble and maintain, the sealing structure is reasonable, and the sealing ring is convenient and practical to replace. Structure: It is mainly composed of valve body, valve disc, sealing ring, valve stem, bracket, valve gland, handwheel, flange, nut, positioning screw and other parts. This type of valve should generally be installed horizontally in the pipeline. Its main parameters are: nominal diameter DN, discharge valve rated flow coefficient KV, discharge valve nominal pressure and pressure difference, discharge valve body and valve components materials, discharge valve flow characteristics, discharge valve applicable temperature , The power supply voltage and control signal of the discharge valve, whether the discharge valve has accessories, etc. Nominal diameter The nominal diameter, also known as the mean outside diameter, represents the symbol DN, which is the general diameter of various pipes and pipeline accessories. Pipes and pipeline accessories of the same nominal diameter can be connected to each other and are interchangeable. It is not the outer diameter or inner diameter of the pipe in the actual sense, although its value is close to or equal to the inner diameter of the pipe, in order to unify the connection size of pipes and fittings , using the nominal diameter (also known as nominal diameter, nominal diameter). For example, welded steel pipes can be divided into thin-walled steel pipes, ordinary steel pipes and thickened steel pipes according to thickness. Its nominal diameter is neither the outer diameter nor the inner diameter, but a nominal size that approximates the inner diameter of ordinary steel pipes. Each nominal diameter corresponds to an outer diameter, and its inner diameter varies with thickness. The nominal diameter can be expressed in metric mm or in imperial in. Pipeline accessories are also expressed by nominal diameter, which is the same as seamed pipe. Nominal pressure (Nominal pressure), indicating the symbol PN, the maximum working pressure allowed when applied at a certain temperature. For the control valve with carbon steel body, it refers to the maximum working pressure allowed under 200℃; for cast iron valve body, it refers to the maximum working pressure allowed under 120℃; for the control valve with stainless steel body, it refers to the maximum working pressure under 250℃ Maximum working pressure allowed when applying. When the working temperature increases, the pressure resistance of the valve body will decrease. For example, a carbon steel control valve with a nominal pressure of 6.4MPa (PN64) has a withstand pressure of 5.2MPa when used at 300°C, 4.1MPa when used at 400°C, and 2.9MPa when used at 450°C. . Main equipment performance 1. Corrosion resistance of the upward-spreading discharge valve: 1. Use media such as water, acetone, alcohol, ammonia, barium carbonate, and benzene (the temperature of WCB material is -29℃-425℃). 2. Use medium such as particles, oil, pulp, carbon dioxide gas (stainless steel material can be used at -60℃-232℃). 3. It is strictly forbidden to use fluorine-containing ionic liquids (such as HF, etc.) nor strong alkali and phosphoric acid (temperature less than 150℃, concentration>30%). 4. The general working temperature of stainless steel is less than or equal to 150℃, and the pressure range is 0.6-2.5MPA. If it exceeds this requirement, please specify when ordering. 2. Upward expansion discharge valve, corrosion resistance: 1. PTFE and metal have excellent adhesion, general tensile strength, dilute acid, concentrated acid, etc. 2. Use medium such as particles, oil, pulp, carbon dioxide gas (stainless steel material can be used at -60℃-232℃). 3. It is strictly forbidden to use fluorine-containing ionic liquids (such as HF, etc.) nor strong alkali and phosphoric acid (temperature less than 150℃, concentration>30%). 4. The general working temperature of stainless steel is -5℃-225℃, and the pressure range is 0.6-1.6MPA. Please specify when ordering more than this. 3. Upward discharge valve: The glass-lined equipment is a vitreous glaze with high silicon content. It is made by coating the metal tire at a high temperature of about 900 degrees. It has good mechanical properties and corrosion resistance, can prevent the substitution of media and metal ions to affect the pollution of products, and the surface is smooth, wear-resistant, and has a certain thermal stability. This valve is resistant to various acids, alkalis, salt solutions and organic solvents except for phosphorus and phosphorus light media, hydrofluorocarbons, hydrochloric acid, and potassium hydroxide. A. Corrosion resistance: 1. It can resist general inorganic acid, organic acid, weak alkali solution (P≤60℃ PH≤12) and organic agent medium. 2. It is better than stainless steel in strong corrosive media such as hydrochloric acid, nitric acid, etc. It is strictly forbidden to use fluorine-containing ionic liquids (such as HF, etc.), nor strong alkalis and phosphoric acid (temperature less than 150 °C, concentration > 30%). B. Heat resistance, it is allowed to be used between -30°C and 240°C (temperature resistance is less than 120°C). C, with a smooth surface. Not easy to stick materials, easy to clean. E. Insulation: The impact resistance is as small as 2500 g/cm, so the impact of hard objects should be avoided during use. F. Performance and application of pressure resistance 0.6MPA Construction and installation points 1) The installation location, height, and direction of import and export must meet the design requirements, and the connection should be firm and tight. 2) For all kinds of manual valves installed on the thermal insulation pipeline, the handle shall not be downward. 3) Visual inspection must be carried out before the valve is installed, and the nameplate of the valve should comply with the current national standard 'General Valve Mark' GB 12220. For the valve whose working pressure is greater than 1.0 MPa and plays the role of cutting off the main pipe, the strength and tight performance test should be carried out before installation, and it is allowed to be used after passing the test. During the strength test, the test pressure is 1.5 times the nominal pressure,The duration is not less than 5min, and the valve shell and packing should be qualified without leakage. During the tightness test, the test pressure is 1.1 times the nominal pressure; the test pressure should meet the requirements of GB 50243 during the duration of the test, and the sealing surface of the valve disc is qualified if there is no leakage. The valve is easy to operate, free to open, flexible and reliable to move; the valve disc is easy to assemble and maintain, the sealing structure is reasonable, and the sealing ring is convenient and practical to replace.
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