原文：
放料阀的知识介绍： 　　放料阀性能与用途：操作方便，开启自由,运动灵活可靠；阀瓣装配维修简单，密封结构合理，密封圈更换方便实用。 　　结构：主要由阀体，阀瓣，密封圈，阀杆，支架，阀压盖，手轮，法兰，螺母，定位螺钉等零件。 　　它的主要参数有：公称通径DN，放料阀额定流量系数KV，放料阀公称压力和压差，放料阀阀体和阀内组件材料，放料阀流量特性，放料阀适用温度，放料阀电源电压和控制信号，放料阀是否带附件等。 　　一、公称通径：(nominaldiameter)，又称平均外径(meanoutsidediameter)，表示符号DN，就是各种管子与管路附件的通用口径。同一公称直径的管子与管路附件均能相互连接，具有互换性.它不是实际意义上的管道外径或内径，虽然其数值跟管道内径较为接近或相等，为了使管子、管件连接尺寸统一，采用公称直径（也称公称口径、公称通径)。例如焊接钢管按厚度可分为薄壁钢管、普通钢管和加厚钢管。其公称直径不是外径，也不是内径，而是近似普通钢管内径的一个名义尺寸。每一公称直径，对应一个外径，其内径数值随厚度不同而不同。公称直径可用公制mm表示，也可用英制in表示。管路附件也用公称直径表示，意义同有缝管。 　　二、公称压力：(Nominalpressure)，表示符号PN，在一定温度下应用时允许的{zd0}工作压力。对碳钢阀体的控制阀，指200℃以下应用时允许的{zd0}工作压力；对铸铁阀体，指120℃以下应用时允许的{zd0}工作压力；对不锈钢阀体的控制阀，指250℃以下应用时允许的{zd0}工作压力。当工作温度升高时，阀体的耐压会降低。例如，公称压力为6.4MPa（PN64）的碳钢控制阀，用于300℃时的耐压为5.2MPa，用400℃时的耐压为4.1MPa，用于450℃时的耐压为2.9MPa。 　　三、称压力阀体材质：铸钢、不锈钢，316L。工作压力0.6-2.5MPA，工作温度-20℃-425℃。阀门口径DN25-DN300。连接方式:法兰。传动方式:手动、气动。适用介质:油品、酸类、腐蚀性介质等。制造标准：国标。 　　放料阀主要用于反应釜,储罐和其它容器的底部排料、放料、取样和无死区关断操作。借助于阀门底部法兰焊接于储罐和其它容器的底部，因此xx工艺介质通常在容器出口的残留现象.放料阀根据实际情况的需要,放底结构设计为平底型,阀体为V型,并提供提升和下降两种工作方式阀瓣。阀体内腔有耐冲刷、耐腐蚀的密封圈，在开启阀门瞬间,可以保护阀体不被介质冲刷,腐蚀，并对密封圈进行特殊处理，使表面硬度达到HRC56-62，具有高耐磨、耐腐蚀的功能，阀瓣密封根据需要时封面均堆焊有硬质合金，密封副采用线密封，保证密封的可靠性，并可防止结疤。同时采取短行程阀瓣的设计。 　　四、主要设备性能： 　　1、放料阀，耐腐蚀性:1.使用介质如水、丙酮、酒精、氨、碳酸钡、苯(WCB材质的温度使用-29℃-425℃)。2.使用介质如颗粒、油品、纸浆、二氧化碳气(不锈钢材质可使用温度-60℃-232℃)。3.严禁使用含氟离子液体(如HF等)也不能用强碱及磷酸(温度小于150℃,浓度＞30%)。 4.不锈钢的一般工作温度≤150℃，压力范围0.6-2.5MPA，超过此规定订货时要说明。 　　2、放料阀，耐腐蚀性:1.聚四氟乙烯与金属粘结性优良，抗拉性一般，耐稀酸、浓酸等。2.使用介质如颗粒、油品、纸浆、二氧化碳气(不锈钢材质可使用温度-60℃-232℃)。3.严禁使用含氟离子液体(如HF等)也不能用强碱及磷酸(温度小于150℃,浓度＞30%)。4.不锈钢的一般工作温度为-5℃-225℃，压力范围0.6-1.6MPA，超过此规定订货时要说明。 　　3、放料阀:搪玻璃设备是含高硅量的玻璃质釉。通过900度左右高温涂于金属胎而成。它具有良好的机械性能和耐腐蚀的性能，能防止介质与金属离子取代作用而影响污染制品，并且表面光洁、耐磨、有一定的热稳定性。此阀除磷及磷轻介质、氢氟碳、盐酸、氢氧化纳、氢氧化钾外能耐各种酸、碱、盐溶液及有机溶剂。A、耐腐蚀性:1.能耐一般无机酸、有机酸、弱碱液(P≤60℃PH≤12)以及有机剂介质。2.在盐酸、硝酸、等强腐蚀介质中优于不锈钢。严禁使用含氟离子液体(如HF等)也不能用强碱及磷酸(温度小于150℃,浓度＞30%)。B、耐热性，允许在-30℃-240℃间使用(耐温急变小于120℃)。C、具有光滑的表面。不易粘结物料、易清洗。E、绝缘性:耐冲击性能较小为2500克/厘米，因而使用时应避免硬物冲击。F、耐压0.6MPA。 　　五、施工、安装要点：本类阀门在管道中一般应当水平安装。 　　1）、安装位置、高度、进出口方向必须符合设计要求，连接应牢固紧密。 　　2）、安装在保温管道上的各类手动阀门，手柄均不得向下。 　　3）、阀门安装前必须进行外观检查，阀门的铭牌应符合现行国家标准《通用阀门标志》GB12220的规定。对于工作压力大于1.0MPa及在主干管上起到切断作用的阀门，安装前应进行强度和严密性能试验，合格后方准使用。强度试验时，试验压力为公称压力的1.5倍，持续时间不少于5min，阀门壳体、填料应无渗漏为合格。严密性试验时，试验压力为公称压力的1.1倍；试验压力在试验持续的时间应符合GB50243标准要求，以阀瓣密封面无渗漏为合格。

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译文：
Discharge valve of the knowledge description: Discharge valve Properties: easy to operate, free to open, flexible and reliable movement; valve repair simple valve assembly, sealing reasonable structure, convenient and practical seal replacement. Structure: the main by the valve body, disc, ring, stem, frame, valve gland, hand wheel, flanges, nuts, screws and other parts. Its main parameters are: nominal diameter DN, discharge valve rated flow coefficients KV, nominal pressure and the pressure discharge valve, discharge valve body and valve component materials, discharge valve flow characteristics, discharge valve for temperature, supply voltage and the discharge valve control signal, whether the discharge valve with accessories. 1, nominal diameter: (nominaldiameter), also known as the average diameter (meanoutsidediameter), said symbols DN, is a variety of pipe and pipeline accessories Universal caliber. The same nominal diameter of the tube and pipe accessories can connect with each other, with interchangeability. It is not a real sense of pipe diameter, or diameter, although its value is closer with pipeline diameter or equivalent, in order for pipe, tube connection size unity, with nominal diameter (also called nominal diameter, nominal diameter). For example, according to the thickness of welded steel pipe can be divided into thin-walled steel, general steel and thicker steel. The nominal diameter is not a diameter, not diameter, but the approximate diameter of an ordinary steel pipe nominal size. Each of nominal diameter, corresponding to an outer diameter, the diameter values vary with thickness. Metric mm nominal diameter can be said, can also be British in that. Piping accessories is also expressed with nominal diameter, meaning tube with a seam. Second, nominal pressure: (Nominalpressure), said the symbol PN, when a certain temperature, the maximum allowed under the application of working pressure. Control valve on the carbon steel valve body, refer to the following applications 200 ℃ maximum allowable working pressure; on the cast iron valve body, refer to the following applications 120 ℃ maximum allowable working pressure; on the stainless steel body of the control valve, refer to below 250 ℃ application the maximum allowable working pressure. When the temperature increases, the body of the pressure will be reduced. For example, the nominal pressure 6.4MPa (PN64) of carbon steel control valves used to 300 ℃, the pressure is 5.2MPa, 400 ℃, the pressure used was 4.1MPa, 450 ℃, the pressure used was 2.9MPa . 3, said pressure valve body material: steel, stainless steel, 316L. Working pressure 0.6-2.5MPA, working temperature -20 ℃ -425 ℃. Valve Diameter DN25-DN300. Connection: flange. Transmission: manual, pneumatic. Suitable medium: oil, acid, corrosive media, etc.. Manufacturing standards: GB. Discharge valve is mainly used for reactors, tanks and other containers in the bottom of the marker, discharge, sampling, and no dead zone off operation. With the valve at the bottom flange welded to the bottom of tanks and other containers, thus removing the process medium is usually left in the container export phenomenon. Discharge valve according to the actual needs of the situation, put the end of structural design for the flat type valve for the V type, and provides two ways of working to enhance and fall disc. Body cavity with erosion-resistant, corrosion-resistant seal, open the valve at the moment, can protect the body being medium erosion, corrosion, and seals for special treatment, the surface hardness of HRC56-62, with high wear , corrosion-resistant function, valve flap seals are required when welding the cover has cemented carbide, sealing ring, sealing, to ensure the reliability of sealing and prevent scarring. While taking a short trip disc design. 4, the main equipment performance: 1, discharge valve, corrosion resistance: 1. Using media such as water, acetone, alcohol, ammonia, barium carbonate, benzene (WCB material the use of temperature -29 ℃ -425 ℃). 2. Use of media such as grain, oil, paper pulp, carbon dioxide gas (stainless steel, can use the temperature -60 ℃ -232 ℃). 3. Prohibited the use of fluoride ionic liquids (such as HF, etc.) Can not alkali and phosphoric acid (temperature less than 150 ℃, the concentration of> 30%). 4. Stainless steel in general operating temperature ≤ 150 ℃, pressure range 0.6-2.5MPA, more than this provision to state when ordering. 2, discharge valve, corrosion resistance: 1. PTFE and metal bonding of excellent tensile strength and general resistance to dilute acid, concentrated acid. 2. Use of media such as grain, oil, paper pulp, carbon dioxide gas (stainless steel, can use the temperature -60 ℃ -232 ℃). 3. Prohibited the use of fluoride ionic liquids (such as HF, etc.) Can not alkali and phosphoric acid (temperature less than 150 ℃, the concentration of> 30%). 4. Stainless steel in general operating temperature -5 ℃ -225 ℃, the pressure range of 0.6-1.6MPA, more than this provision to state when ordering. 3, discharge valve: glass-lined equipment is high in silicon content of the vitreous enamel. Apply high temperature by 900 degrees is made of metal tires. It has good mechanical properties and corrosion performance, can prevent the media and the role of metal ions replace the impact of contaminated products, and smooth surface, wear a certain thermal stability. This valve phosphorus and phosphorus light medium, hydrofluorocarbons, hydrochloric acid, sodium hydroxide, potassium hydroxide outside the competence of various acid, alkali, salt solution and organic solvents. A, resistance to corrosion: 1. Competence generally inorganic acid, organic acid, weak alkali solution (P ≤ 60 ℃ PH ≤ 12) and organic agents medium. 2. In hydrochloric acid, nitric acid, and other strong corrosive medium is better than stainless steel. Do not use fluoride ionic liquids (such as HF, etc.) Can not alkali and phosphoric acid (temperature below 150 ℃, the concentration of> 30%). B, heat resistance, allowing use between -30 ℃ -240 ℃ (Temperature rapid change than 120 ℃). C, has a smooth surface. Difficult to bond materials, easy to clean. E, insulation: less impact resistance of 2500 g / cm, and thus should avoid use of the impact of hard objects. F, pressure 0.6MPA. 5, construction, installation key points: the type valve in the pipeline in general should be installed horizontally. 1), the installation location, height, must meet the design requirements of the import and export orientation, the connection should firmly close. 2), pipe insulation installed in all kinds of manual valve handle are not down. 3), the valve must be installed prior to visual inspection, the valve plate should be consistent with existing national standards, "Universal Valve logo" GB12220 provisions. The working pressure in the main pipe is greater than 1.0MPa and the role played off the valve, the installation should be carried out before the intensity and tight performance test, pass behind the prospective use. Strength test, the test pressure for the nominal pressure of 1.5 times the duration of not less than 5min, the valve housing, packing should be no leakage in compliance. Tightness test, the test pressure for the nominal pressure of 1.1 times; test pressure test duration should be consistent with GB50243 standards to valve sealing surface of valve leakage is not qualified.