计量泵

原文:计量泵使用过程中的疑难题目解答:疑难题目一:当运行加药系统时应注意哪一些重要事项?答:A.投加点压力;B.冲程频率;C.吸升高度;D.海拔高度;E.化学品的腐蚀性疑难题目二:当计量泵出口为大气压时,有什么办法可以提高泵的重复计量精度?隔膜泵答:在计量泵排出阀安装阀弹簧可以改善重复计量精度,但是最有用的改善办法是在管线的末端安装1个背压阀。阀门入口泵工业洗衣机疑难题目三:怎么调节背压阀?答:1.永远不要超过计量泵的最大工作压力。2.当计量泵在吸液端有压力时,泵的排出真个压力真空泵至少要比吸入真个压力高1bar。疑难题目四:如何计选择合适的脉冲阻尼器容积?答:用计量泵每一冲程的计量能力(ml)乘以26,就可以得出减小90%脉动所需要的脉冲阻尼器的最小容积(ml)。疑难题目五:如何设定安全阀的压力?答:安全阀的压力可以在计量泵定额工作压力范围以内调整,不允许超过计量泵的最大工作压力。安全阀设计用来防止计量泵过压运行。例如,要是自吸泵计量泵的最大工作压力为3bar,安全阀的压力就应该设定为3bar,或者更低一些以确保计量泵的没事了工作。超压工作是导致计量泵损坏的主要原因之一。疑难题目六:要是输送的液体不是水,吸升高度如何计算?答:将计量泵的定额吸升高度除以计量液体的比重。疑难题目七:在什么情况下用自灌式吸液?答:1.计量的液体容易挥发;2.计量液体比重较大;3.当需要较高的冲程频率时;4.计量泵在高海拔地域工作时;5.在现场应用时需要较大的储罐,并且依靠计量泵自吸不成行的情况下。疑难题目八:能否给出一些关于计量泵泵头选择方面的提议?在关于化工泵到化学药品对泵头/密封的腐蚀方面,通常会有哪一些疑难题目出现,应如何避免?答:在关于到计量泵泵头,通常的疑难题目是出现在计量酸、氯、氟化物以及过氧化氢的情况时。由于药品液体浓度以及操作温度的不同,很难确定具体泵头材质。在计量氟化物时,我们推荐选用Viton?密封的PVC泵头。对于大大都加氯的应用,最好选用EPDM密封的NP(有机玻璃)泵头。对于过氧化氢混合物的计量只能选用PTFE密封的PTFE泵头或不锈钢泵头。浓盐酸的计量通常选用Viton。密封的有机玻璃泵头。螺杆泵浓硫酸的计量可以选择PTFE密封的PTFE泵头。化学药品的打造商会给出相关的提议,或者查阅ProMinent?化学防腐图表来确定化学药品与接触材质的相容性。疑难题目九:在泵头计量液体时,必须考虑哪一些影响因素?答:主要考虑的因素有液体的粘度、比重、蒸汽压以及温度。

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译文:Metering pumps used in the process of questions:Issue 1:When running Dosing System What is important when?Answer:A.adding point pressure;B.Stroke frequency;C.suction lift;D.altitude;E.corrosive chemicals Question 2:When measuring atmospheric pressure when the pump outlet is there any way to improve the measurement accuracy of the pump to repeat?A:The measurement of pump dischargeSuber-water pumps valve installed in the valve spring can improve the precision of repeated measures,but the most effective way for improvement is in the pipeline at the end of aback pressure valve installed.Imports of industrial washing machine pump valve Question three:how adjust back-pressure valve?A:1.Never exceed the maximum working pressure metering pump.2.When the metering pump liquid end of the suction pressure,the pump discharge pressure side suction pressure at least higher than 1bar.Question four:how the selection of Screw pumpssuitable volume pulse damper?A:The measurement of each stroke of the metering pump capacity(ml)multiplied by 26,it can be required to reduce 90%of the pulse of the pulse damper minimum volume(ml).Question 5:How to set the pressure relief valve?A:The pressure relief valve in the metering pump can be within the rated working pressure adjustment must not exceed the maximum working pressure metering pump.Safety valve designed to prevent excessive pressure metering pumps running.For example,if the maximum working pressure metering pumps for the 3bar,the pressure relief valve should be set to 3bar,or lower number to ensure that the metering pump to work properly.Overpressure is the main reason leading to damage to one of metering pumps.Question 6:If the transmission fluid is not water,suction lift calculated?A:The measurement of the rated suction lift pump divided by the proportion of liquid measurement.Question 7:Under what circumstances self-filling with liquid suction?A:1.Measurement of liquid likely to be volatile;2.Measuring the proportionSelf-priming pumps of large liquid;3.When you need ahigher stroke frequency;4.Metering pumps work at high altitudes;5.In the field use need larger tanks and metering pumps self-priming is not feasible to rely on the case.Question 8:Can give some measure pumpsMagnetic pumps pump head on the recommendations of choice?In relation to the chemicals on the pump head/sealed corrosion aspects,which often have problems,how to avoid?Answer:when it comes to metering pumps pump head,the usual problem is that in measuring acid,chlorine,fluoride and hydrogen peroxide situations.As the drugs in different concentrations and operating temperature,it is difficult to identify specific pump head material.In the measurement of fluoride,we recommend use Viton?Sealed PVC pump head.For most of the chlorination of the application,the best use EPDM seals NP(PMMA)pump head.Mixture for the measurement of hydrogen peroxide can Chemical pumpsonly use PTFE or stainless steel pump head seal PTFE pump head.Measurement of concentrated hydrochloric acid is usually used Viton.Sealed glass pump head.Measurement of sulfuric acid can choose sealed PTFE PTFE pump head.Chemical manufacturers give relevant recommendations,or Search ProMinent?Chemical resistance chart to determine the chemical compatibility of materials and contacts.Issue nine:Measurement of liquid in the pump head,must consider what factors?A:The main factors considered in the liquid viscosity,specific gravity,vapor pressure and temperature.

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