自力式壓力控制閥

1、1◆一般資料一般資料Generalinfmation1、產(chǎn)品的功能用途和適用范圍、產(chǎn)品的功能用途和適用范圍Featureapplication自力式壓力調(diào)節(jié)閥(以下簡稱壓力閥)是一種無需外來能源而只依靠調(diào)介質(zhì)自身的壓力變化進(jìn)行自動(dòng)調(diào)節(jié)壓力的節(jié)能型產(chǎn)品具有測量、執(zhí)行、控制的綜合功能。廣泛適用于石油、化工、冶金、輕工等工業(yè)部門及城市供熱、供噯系統(tǒng)。本產(chǎn)品可用于非腐蝕性(最高溫度350℃)的液體、氣體和蒸汽等介質(zhì)的壓力控制裝置。Pressur

2、eselfregulatingvalve（hereinafterreferredtoaspressurevalve）aenergysavingproductregulatespressureautomaticallywithoutexternalenergysupply.Pressurevalveisusedfpressurecontroldeviceofnoncrosiveliquidgassteammediumetc.thathas

3、integratedfunctionofmeasureperfmancecontrol.Pressurevalvefindsusinthefieldofpetroleumchemicalindustrymetallurgylightindustrycityheatingsystemetc..2、產(chǎn)品的結(jié)構(gòu)及工作原理、產(chǎn)品的結(jié)構(gòu)及工作原理Structurewkingprinciplea產(chǎn)品結(jié)構(gòu)Structure本產(chǎn)品為直接作用型自力式壓力

4、調(diào)節(jié)閥由閥體、閥座、閥芯部件、閥蓋、頂盤、上、下膜蓋、膜片、彈簧、調(diào)節(jié)螺母等零部件所組成。其具體結(jié)構(gòu)參見圖la，圖lb、圖lc、圖ld所示：Pressurevalveisofdirectactiontypewhichiscomposedofbodyseatcepartsbonhighestquotationdiaphragmspringadjustingnutupperbottomdiaphragmcoveretc..Thespecif

5、icstructureseest1a1b1c1d.b工作原理Wkingprinciple(I)作閥后壓力調(diào)節(jié)時(shí)的工作原理：(見圖la)工藝介質(zhì)的閥前壓力Pl經(jīng)過閥芯、閥座的節(jié)流后，變?yōu)殚y后壓力P2。P2經(jīng)過控制管線輸入執(zhí)行器的下膜室作用在頂盤上產(chǎn)生的作用力與彈簧的反作用力相平衡決定了閥芯、閥座的相對位置控制閥后壓力。當(dāng)閥后壓力P2增加時(shí)P2作用在頂盤上的作用力也隨之增加。此時(shí)頂盤的作用力大于彈簧的反作用力使閥芯關(guān)向閥座的位置直到頂盤的作

6、用力與彈簧反作用力相平衡為止。這時(shí)閥芯與閥座之間的流通面積減少流阻變大從而使P2降為設(shè)定值。同理，當(dāng)閥后壓力P2降低時(shí)作用方向與上述相反這就是閥后壓力調(diào)節(jié)時(shí)的工作原理。當(dāng)需要改變閥后壓力P2的設(shè)定值時(shí)可調(diào)整調(diào)節(jié)螺母8。（1）Thewkingprincipleofregulatingthebackofvalve’spressure:（seet1a）AfterbeingthrottledbyceseatP1becomesP2.（P1stsf

7、thefrontofvalve’spressureP2stsfthebackofvalve’spressure.）GettingthroughbottomdiaphragmroomP2actsonthehighestquotationcreatesactingfce.Theactingfcekeepsitsbalancewithreactingfceofspringwhichdecidestherelativeplaceofceseat

8、controlsthebackofvalve’spressure.WhenP2increasestheactingfceisalsoincreasing.Heretheactingfceisbiggerthanthereactingfcewhichmadethececlosetotheseatuntilbalance.thecirculationareabetweenceseatdecreasesflowresistanceincrea

9、sestherebyP2felltothesettingvalue.AlsowhenP2decreasestheactingfcedirectioniscontrary.WhenP2`ssettingvalueneedstobechangedyoucanregulatetheadjustingnut8.3(2)作閥前壓力調(diào)節(jié)時(shí)的工作原理：(見圖lb)工藝介質(zhì)的閥前壓力Pl通過閥芯、閥座節(jié)流后變?yōu)殚y后壓力P2同時(shí)Pl通過控制管線輸入執(zhí)行器

10、的上膜室內(nèi)作用在頂盤上產(chǎn)生的作用力與彈簧的反作用力相平衡決定了閥芯、閥座的相對位置控制閥前壓力。當(dāng)閥前壓力Pl增加時(shí)Pl作用在頂盤上的作用力也隨之增加。此時(shí)頂盤上的作用力大于彈簧的反作用力使閥芯向離開閥座方向移動(dòng)直到頂盤的作用與彈簧反作力相平衡為止。這時(shí)閥芯與閥座之間流通面積變大流阻變小從而使PI降為設(shè)定值。同理當(dāng)閥前壓力PI降低時(shí)作用方向與上述相反。這就是閥前壓力調(diào)節(jié)時(shí)的工作原理。當(dāng)需要改變閥前壓力PI的設(shè)定值時(shí)可調(diào)整調(diào)節(jié)螺母8。（2

11、）Thewkingprincipleofregulatingthefrontofvalve’spressure:（seet1b）AfterbeingthrottledbytheceseatP1becomesP2（P1stsfthefrontofvalve`spressureP2stsfthebackofvalve`spressure.）MeanwhilegettingthroughbottomdiaphragmroomP1actsonh

12、ighestquotationcreatesactingfce.Theactingfcekeepsitsbalanceoftheceseatcontrolsthefrontofvalve`spressure.WhenP1increasestheactingfceisalsoincreasing.Atthistimetheactingfceisbiggerthanthereactingfcewhichmadetheceleavethese

13、atuntilbalance.HerethecirculationareabetweentheceseatincreasesflowresistancedecreasestherebyP1felltothesettingvalue.AlsowhenP1decreasestheactingdirectioniscontrary.WhenP1`ssettingvalueneedstobechangedyoucanregulateadjust