The basic performance of the discharge valve purpose and installation of construction points

May 12, 2021

Discharge valve knowledge: discharge valve performance and purpose: easy to operate, open freedom, flexible and reliable movement; valve assembly and maintenance simple, reasonable sealing structure, the sealing ring is convenient and practical. Structure: Mainly by the body, disc, seals, stems, brackets, valve gland, hand wheel, flange, nuts, screws and other parts positioning. Its main parameters are: nominal diameter DN, discharge valve rated flow coefficient KV, discharge valve nominal pressure and pressure, discharge valve body and valve components, discharge valve flow characteristics, discharge valve for the temperature , Discharge valve power supply voltage and control signals, discharge valve with accessories or not. First, the nominal diameter: (nominaldiameter), also known as the average diameter (meanoutsidediameter), said the symbol DN, is a variety of pipe and pipe accessories common caliber. Pipe and pipe fittings of the same nominal diameter can be connected to each other and are interchangeable. It is not a pipe diameter or an inner diameter in the actual sense. Although its value is close to or equal to the pipe inner diameter, in order to make the pipe and pipe fittings uniform in size , Using the nominal diameter (also known as nominal diameter, nominal diameter). For example, the thickness of welded steel pipe can be divided into thin-walled steel pipe, ordinary steel and thick steel pipe. The nominal diameter is not the outer diameter, nor the inner diameter, but similar to the nominal diameter of a common pipe size. Each nominal diameter, corresponding to an outer diameter, the diameter of the value varies with the thickness of different. Nominal diameter available metric mm said, can also be used in English said. Pipe fittings are also used to indicate the nominal diameter, meaning the same seam pipe. Second, the nominal pressure: (Nominalpressure), said the symbol PN, at a certain temperature, the maximum allowable working pressure. The control valve for carbon steel body refers to the maximum working pressure allowed for applications below 200 Â° C .; for cast iron bodies, the maximum working pressure allowed for applications below 120 Â° C; for stainless steel body valves, The maximum allowable working pressure when applied. When the working temperature increases, the body pressure will be reduced. For example, a carbon steel control valve with a nominal pressure of 6.4 MPa (PN64) has a pressure resistance of 5.2 MPa at 300 Â° C, a pressure of 4.1 MPa at 400 Â° C, a pressure of 2.9 MPa at 450 Â° C . Third, the pressure valve body material: cast steel, stainless steel, 316L. Working pressure 0.6-2.5MPA, working temperature -20 â„ƒ -425 â„ƒ. Valve diameter DN25-DN300. Connection: Flange. Transmission: manual, pneumatic. Applicable medium: oil, acids, corrosive media. Manufacturing standards: GB. The discharge valve is mainly used for discharging, discharging, sampling and no-dead-zone shutdown of reactors, tanks and other containers. With the help of the bottom flange of the valve welded to the bottom of the tank and other containers, thus eliminating the process medium usually in the container outlet of the residual phenomenon.Discharging valve according to the actual situation, the bottom structure design for the flat type, the body is V , And to provide promotion and fall of two kinds of work disc. The body cavity is resistant to erosion, corrosion-resistant seals, the valve can be opened at the moment, you can protect the body from medium erosion, corrosion, and special treatment of the seal to the surface hardness of HRC56-62, with high wear resistance, Corrosion-resistant function, the valve flap seal as needed are covered with hard alloy cover, sealing the use of line sealing, to ensure the reliability of the seal, and to prevent scarring. At the same time take a short stroke valve design. Fourth, the main equipment performance: 1, discharge valve, corrosion resistance: 1. The use of media such as water, acetone, alcohol, ammonia, barium carbonate, benzene (WCB material temperature using -29 â„ƒ -425 â„ƒ). 2. The use of media such as particles, oil, pulp, carbon dioxide gas (stainless steel temperature -60 â„ƒ -232 â„ƒ). 3. Do not use fluoride ionic liquids (such as HF, etc.) can not use strong alkali and phosphoric acid (temperature is less than 150 â„ƒ, concentration> 30%). 4. Stainless steel general working temperature â‰¤ 150 â„ƒ, pressure range 0.6-2.5MPA, more than this requirement when ordering instructions. 2, discharge valve, corrosion resistance: 1. Polytetrafluoroethylene and metal bonding, tensile resistance in general, resistance to dilute acid, concentrated acid and so on. 2. The use of media such as particles, oil, pulp, carbon dioxide gas (stainless steel temperature -60 â„ƒ -232 â„ƒ). 3. Do not use fluoride ionic liquids (such as HF, etc.) can not use strong alkali and phosphoric acid (temperature is less than 150 â„ƒ, concentration> 30%). 4. The general working temperature of stainless steel -5 â„ƒ -225 â„ƒ, pressure range 0.6-1.6MPA, more than this requirement when ordering instructions. 3, discharge valve: Glass-lined equipment is the amount of high-silicon glass enamel. Through the 900 degrees high temperature coated metal tire made. It has good mechanical properties and corrosion-resistant properties, to prevent the media and metal ions replace the role of pollution products, and the surface smooth, wear-resistant, a certain degree of thermal stability. This valve phosphorus and phosphorus light medium, hydrofluorocarbon, hydrochloric acid, sodium hydroxide, potassium hydroxide outside the various acid, alkali, salt solution and organic solvents. A, Corrosion resistance: 1. Withstands the general inorganic acid, organic acid, weak alkaline solution (Pâ‰¤60 â„ƒ PHâ‰¤12) and organic medium. 2. In hydrochloric acid, nitric acid, such as corrosive medium is better than stainless steel. Do not use fluoride ionic liquids (such as HF, etc.) can not use strong alkali and phosphoric acid (temperature is less than 150 â„ƒ, concentration> 30%). B, heat resistance, allowed to use between -30 â„ƒ -240 â„ƒ (temperature rapid change less than 120 â„ƒ). C, with a smooth surface. Not easy to bond materials, easy to clean. E, Insulation: Impact resistance of the smaller 2500 g / cm, and therefore should be used to avoid hard impact. F, pressure 0.6MPA. Fifth, construction, installation points: This type of valve in the pipeline should be generally horizontal installation. 1), the installation location, height, direction of import and export must meet the design requirements, the connection should be firm and tight. 2), installed in the insulation pipe on all types of manual valves, the handle shall not be down. 3), the appearance of the valve must be installed before the inspection, the valve nameplate should be consistent with the current national standard "General Valve Flags" GB12220 requirements. For the working pressure is greater than 1.0MPa and the main pipe to play the role of cut-off valve, the installation should be carried out before the intensity and tightness test, qualified after the standard use. Strength test, the test pressure of 1.5 times the nominal pressure, the duration of not less than 5min, valve housing, packing should be no leakage as qualified. Tightness test, the test pressure of 1.1 times the nominal pressure; test pressure in the test duration should be consistent with GB50243 standard requirements, the valve flap sealing surface without leakage as qualified. This article Keywords: valve
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