箭形止回阀：能防止井下溢流从钻具内喷出,防止井喷事故,减少泥浆的损失和保持钻台的清洁。箭型回压阀是钻井过程中钻具内防喷工具之一。该工具同其他结构形式的回压阀相比，具有强度高、耐压高、安全可靠的有点。ArrowBackPressureValve:ArrowBackPressureValveisanintegratedtoolwhichcanpreventdowholekickfromblowout,alsokeepofftheblowoutaccident.Thusreducingmudlossandensuringacleanrigparedwiththeotherbackpressurecalve,itpossesssedtheadvantageofhighstrength,highpressure-resistant,safetyandreliable,etc.Arrowtypebackpressurevalveisanimportanttoolpreventingofblowout.Thedesignofthearrowtypebackpressurevalveallowsforanon-sitedeterminationofbackpressuretobesetatsurface.Thetoolshouldbeconnectedtoneededdrillingpositioninoperation.Undernormaldrillingcondition,drillingliquidpassthroughvalvebodyandwaterchanneltofurnishdownward.Whenhappenedwellkickandblowout,undergroundpressureimpelvalvebodytomoveupward14°pyramidalfaceofvalvebodyisfittedtightlyagainstgasketpyramidalface,theycanpreventdrillingliquidwithinthedrillingfromgushingandblowoutupward.箭形止回阀技术参数SpecificationofTypeArrowBackPressureValve型号Type外径O.D(mm)内径I.D(mm)连接螺纹Connection***大密封压力Max.SealPressure(Mpa)FJ898933NC263570FJ10510544NC313570FJ12112156NC383570FJ15915970N***63570FJ16516582NC503570FJ16816882NC503570FJ178178825-1/2FH3570FJ203203826-5/8REG3570FJ229229827-5/8REG3570)