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1、Spoolvalves滑閥Themostcommonsliding-actionvalveisthespool-typevalve,Figure5.大多數(shù)常見的滑動動作閥是滑閥式換向閥。見圖5。Fluidisroutedtoorfromtheworkportsasthespoolslidesbetweenpassagestoopenandcloseflowpaths,dependingonspoolposition.當(dāng)閥芯在各通路之間滑動時油液導(dǎo)入或?qū)С龉ぷ饔涂?，根?jù)閥芯位置打開和封閉通道。Spool
2、valvesreadilyadapttomanydifferentspool-shiftingschemes,whichbroadenstheiruseoverawidevarietyofapplications.滑閥適于多種不同的閥芯移動方案，因此滑閥的用途廣泛。Manymobileapplicationsrequiremeteringorthrottlingtoenabletheoperatortoslowlyorgentlyaccelerateordecelerateaload.在許多移動應(yīng)用中
3、要求計量或節(jié)流以使操縱機構(gòu)能夠緩慢地增加或減小載荷。Intheseinstances,thespoolmaybemodifiedwithVnotches,forexample,sothatasmalldisplacementofthespoolgraduallypermitsincreasingordecreasingfluidflowtograduallyspeedorslowactuatorandloadmovement.在這些情況下，可修改閥芯，例如，將閥芯改成帶V型缺口。這樣閥芯可少量位移使油
4、液流量逐漸增加或減小，從而逐漸加速或減慢執(zhí)行機構(gòu)和載荷的運動。Thistechniqueisalsousedinvalvesforindustrialequipment.這項技術(shù)也應(yīng)用于工業(yè)設(shè)備的閥門。Abeveledornotchededgeonthespooliscommonlyreferredtoasasoft-shiftingfeature.閥芯上的斜切邊緣或缺口邊緣通常被指稱軟移動特性。Avariationofthesingle-ormultiple-spoolvalveisthestack
5、valve,Figure5,inwhichanumberofspoolandenvelopesectionsareboltedtogetherbetweenaninletandoutletsectiontoprovidecontrolofmultipleflowpaths.單芯或多芯滑閥的一個變型是雙動滑閥，見圖5。圖中，在進(jìn)油口截面和出油口截面之間，用螺栓將幾個閥芯和包覆它們的閥體連接起來，從而控制多個油路。Inadditiontoprovidingacentralvalvelocationfort
6、hemachineoperator,thevalvegroupingreducesthenumberoffluidconnectionsinvolvedandincreaseseaseofsealing.Thenumberofvalvesthatcanbestackedinthismannervariesfromonemanufacturertoanother。除了能給操縱者提供中位機能，這種閥組還能減少油路的連接，使密封變得容易，通過這種方式組裝到一起的閥的數(shù)量也能因人而異。Mountingconf
7、igurations安裝結(jié)構(gòu)Traditionalvalvesarebuiltinaconfigurationforinlinemounting.傳統(tǒng)的閥門都是內(nèi)置式安裝。Butthisarrangementislaborintensive,requiresassemblyofmultiplecomponents,andispronetoleakage.但這種安裝方式需要將多個零件組裝在一起，特別費工，而且容易出現(xiàn)泄漏。Thesefactorsaddtoinstallationcostandcanha
8、veanevengreaterimpactonmaintenancecosts.這不但增加了安裝成本而且更加增添維護(hù)成本。Therefore,mostdesignerschoosesubbaseormanifoldmountingtoavoidtheseproblems.因此，多數(shù)設(shè)計師選擇板式安裝來避免上述問題。Inthesubbasemountingsystem,allconductinglinesareconnectedtothesubbasean
