PARKER PVS系列變量葉片泵推動高粘流體進(jìn)入吸入口一側(cè)的兩齒空間是非常重要的，如果這一空間沒有填充滿，則泵就不能排出準(zhǔn)確的流量，所以PV值（壓力×流速）也是另外一個限制因素，而且是一個工藝變量。由于這些限制，齒輪泵制造商將提供一系列產(chǎn)品，即不同的規(guī)格及排量（每轉(zhuǎn)一周所排出的量）。這些泵將與具體的應(yīng)用工藝相配合，以使系統(tǒng)能力及價格達(dá)到*。 　　
Parker PVS系列變量葉片泵的齒輪與軸共為一體，采用通體淬硬工藝，可獲得更長的工作壽命。“D”型軸承結(jié)合了強制潤滑機理，使聚合物經(jīng)軸承表面，并返回到泵的進(jìn)口側(cè)，以確保旋轉(zhuǎn)軸的有效潤滑。這一特性減少了聚合物滯留并降解的可能性。精密加工的泵體可使“D”型軸承與齒輪軸精確配合，確保齒輪軸不偏心，以防齒輪磨損。Parkool密封結(jié)構(gòu)與聚四氟唇型密封共同構(gòu)成水冷密封。這種密封實際上并不接觸軸的表面，它的密封原理是將聚合物冷卻到半熔融狀態(tài)而形成自密封。也可以采用Rheoseal密封，它在軸封內(nèi)表上加工有反向螺旋槽，可使聚合物被反壓回到進(jìn)口。
PARKER PVS系列變量葉片泵在一定轉(zhuǎn)速或往復(fù)次數(shù)下的流量是一定的，幾乎不隨壓力而改變；往復(fù)泵的流量和壓力有較大脈動，需要采取相應(yīng)的消減脈動措施；回轉(zhuǎn)泵一般無脈動或只有小的脈動；具有自吸能力，泵啟動后即能抽除管路中的空氣吸入液體；啟動泵時必須將排出管路閥門*打開；往復(fù)泵適用于高壓力和小流量；回轉(zhuǎn)泵適用于中小流量和較高壓力；往復(fù)泵適宜輸送清潔的液體或氣液混合物?？偟膩碚f，容積泵的效率高于動力式泵。 動力式泵靠快速旋轉(zhuǎn)的葉輪對液體的作用力，將機械能傳遞給液體，使其動能和壓力能增加，然后再通過泵缸，將大部分動能轉(zhuǎn)換為壓力能而實現(xiàn)輸送。動力式泵又稱葉輪式泵或葉片式泵。離心泵是zui常見的動力式泵。

Parker PVS系列變量葉片泵是靠活塞往復(fù)運動或旋轉(zhuǎn)將氣體吸入、壓縮并排出。它們的優(yōu)點是新投入使用的泵真空度相對比較高，但是活塞是運轉(zhuǎn)部件，因此活塞的磨損是避免不了的，隨著檢修次數(shù)的增加工作真空度將不斷下降，直至滿足不了生產(chǎn)的要求。此類泵工作噪音大，耗油量大，故障率高也是其致命的缺點，一般都需要開一臺備用一臺，這無形中增加了設(shè)備投資與運行費用。另外如果用此類泵抽吸水蒸汽等可凝性氣體，將使?jié)櫥腿榛虼酥荒軕?yīng)用在抽吸不凝性（空氣類）氣體，也不能抽吸帶有顆粒狀的介質(zhì)，這也就限制了其適用范圍。
Parker PVS系列變量葉片泵是靠裝在泵殼內(nèi)的帶有多葉片的偏心轉(zhuǎn)子旋轉(zhuǎn)，把水拋向泵殼形成與泵殼同心的水環(huán)，水環(huán)與轉(zhuǎn)子葉片形成了容積周期變化從而將氣體吸入、壓縮并排出。它的優(yōu)點是低真空時抽氣量大、可以直接抽吸水蒸汽等可凝性氣體。它的缺點是真空度低；不能抽吸帶有顆粒狀的介質(zhì)；轉(zhuǎn)子高速旋轉(zhuǎn)不易做防腐處理，因此不能抽吸具有腐蝕性的介質(zhì)。
Parker PVS系列變量葉片泵在粗真空取得方面不斷被人們所器重。由于水環(huán)泵中氣體壓縮是等溫的，故可抽除易燃、易爆的氣體，此外還可抽除含塵、含水的氣體，因而,先導(dǎo)活塞式減壓閥，水環(huán)泵運用日益增多。在泵體中裝有過量的水作為工作液。當(dāng)葉輪按圖中順時針方向旋轉(zhuǎn)時，水被葉輪拋向周圍，因為向心力的作用，水構(gòu)成了一個決議于泵腔外形的近似于等厚度的鎖圓環(huán)。
Parker PVS系列變量葉片泵對于粘度或密度在工藝中有變化的流體，這種泵不會受到太多影響。如果有一個阻尼器，比如在排出口側(cè)放一個濾網(wǎng)或一個限制器，泵則會推動流體通過它們。如果這個阻尼器在工作中變化，亦即如果濾網(wǎng)變臟、堵塞了，或限制器的背壓升高了，則泵仍將保持恒定的流量，直至達(dá)到裝置中zui弱的部件的機械極限（通常裝有一個扭矩限制器）。 　　
Parker PVS系列變量葉片泵對于一臺泵的轉(zhuǎn)速，實際上是有限制的，這主要取決于工藝流體，如果傳送的是油類，泵則能以很高的速度轉(zhuǎn)動，但當(dāng)流體是一種高粘度的聚合物熔體時，這種限制就會大幅度降低。 　　
Parker PVS系列變量葉片泵在一定轉(zhuǎn)速下產(chǎn)生的揚程有一限定值，揚程隨流量而改變；工作穩(wěn)定，輸送連續(xù)，流量和壓力無脈動；一般無自吸能力，需要將泵先灌滿液體或?qū)⒐苈烦槌烧婵蘸蟛拍荛_始工作 ；適用性能范圍廣；適宜輸送粘度很小的清潔液體，特殊設(shè)計的泵可輸送泥漿、污水等或水輸固體物。動力式泵主要用于給水、排水、灌溉、流程液體輸送、電站蓄能、液壓傳動和船舶噴射推進(jìn)等。
Parker PVS系列變量葉片泵也稱定量泵或比例泵。計量泵屬于往復(fù)式容積泵，用于精確計量的，通常要求計量泵的穩(wěn)定性精度不超過±1%。隨著現(xiàn)代化工業(yè)朝著自動化操作、遠(yuǎn)距離自動控制這一形勢的不斷發(fā)展，計量泵的配套性強、適應(yīng)介質(zhì)（液體）廣泛的優(yōu)勢尤為顯得特出。代替手工物料配比，使物料配比實現(xiàn)了遠(yuǎn)距離自動控制下的連續(xù)操作，并使物料配比更加準(zhǔn)確無誤，從而提高產(chǎn)品質(zhì)量、降低成本、改善勞動條件、提高全員勞動生產(chǎn)力、全面實現(xiàn)工藝流程的自動化創(chuàng)造了條件。

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PV270R1D3T1NFDS4210
PV270L1K1T1NFFZ+PVAC1ECMNSJP20
PV180R1L8T1NFWS4210
PV180R1L1T1NFWS4210
PV180R1K4T1NZLC4240
PV180R1K1T1NTLB4240
PV180R1K1C1NFPZ+RE06M17T2N1F02
PV180R1F3T1NFFC4211
PV180R1D1T1NWCC4240
PV180L1L1T1NFPD4241
PV180L1K8T1NMLC4240
PV180L1D1T1NFFP4211
PV140R9K1T1NFPZ+PVAC1PSMNS35
PV140R1L1A1NFPV4241
PV140R1K4T1NFPP4241
PV140R1K1T1NWLA4240
PV140R1K1T1NTLZ+PVAC1ECMNSJP20
PV140R1K1T1NSLA4240
PV140R1K1T1NFTZ+PVAC1ETMNSJP20
PV140R1K1T1NFRZ+PVAC2PCMNSJW20
PV140R1K1B1NFR14211
PV140R1G3B1VFR14211X5835
PV140R1D1T1NUCB4240
PV140R1D1T1NFPV4241
PV140L1K1T1NFFC4211
PV092R1L1T1NUCC4240
PV092R1L1T1NFFC4211
PV092R1K4T1NFR14211
PV092R1K4T1NFFZ+PVAC2PCMNSYW20
PV092R1K1T1VFPR4241
PV092R1K1T1NFRZ+PVAC1ECMNSTP20
PV092R1K1A1NSLA4240
PV092R1E3T1NFFC4211
PV080R1K1T1NMLZ+PVAC1ECMNSJP20
PV080R1K1T1NGLC4240
PV080R1K1T1NFPE4241
PV080L1K4T1NFFP4211
PV063R9L1B1NFWS4210
PV063R2K1T1N00142
PV063R1K1T1WFPR4241
PV063R1K1T1NWPV4241
PV063R1K1T1NKLA4240
PV063R1K1T1NGLC4240
PV063R1K1T1NFRZ+PVAC1ECMNSJP20
PV063R1K1T1NFRC4211
PV063R1K1T1NFPZ+DSAE1007P07XLA
PVP4836D9L2A10
PVP4836C9R9A4C10
PVP4830RA10
PVP4136C9R59A4A
PVP41369L5A10
PVP41369L2M10
PVP4130R10
PVP33302RA20
PVP33302R2H20
PVP2336K9R59B320
PVP1636K9R5M12
PVP1636K9R5A12X3204
PVP1636B9RC12 MAX. 210 BAR
PVP1636B9RA12 MAX. 210 BAR
PVP1636B9R5AV12 MAX. 210 BAR
PVP140369R29A4A10
PVP10036K9LHLM10
PVM080R1K1A1VFC1110
PVM080L9K1T1NMS1110
PVM063R1K1T1NMS1110
PVM040L1D1T1NFC1110
PVM032R1K1T1NFC1110
PVK16EH140B2
PVD08EH140C2G024
PVCRER1N111
PVCRCS1N111
PVCRARCN311
PVCPCHS1N110
PVCPAHS1V110
PVCPAHS1N110
PVCLELBN140
PVCLALCN140
PVCLACAN140
PVCFETFN121
PVCFEP1N10
PVAPVV53N10
PVAPVV51N20
PVAPVV34V10
PVAPVS3MNWS10
PVAPSE13V20
PVAPPQ1MNWS10
PVAC2PSMNSJP20
PVAC2PCMNLJW20
PVAC2MCSNSYC20
PVAC2MCMNSJW4520
PVAC1PTMVS3520
PVAC1ECMNSTP20
PVAC1ECMNLJP20
PV270R9K8T1NTLC4240
PV270R9K1T1NFWS4210
PV270R1L1T1NZLC4240
PV270R1L1T1N2LC4240
PV270R1K1T1NYLC4240
PV270R1K1T1NYLB4240
PV270R1K1T1NYCB4240
PV270R1K1T1NWCC4240
PV270R1K1T1NFPG4241
PV270R1K1J1N3LZ+PVAC2PCMNSJP20
PV270R1K1C1NZLC4240
PV270L1K1B1NFFC4211
PV180R9L4T1NFPG4241
PV180R9K1T1NFFC4211
PV180R9F1T1NFFC4211
PV180R1K1T1NZLB4240
PV180R1K1T1NSLB4240
PV180R1K1T1NMLZ4240X5842
PV180R1E3T1NFHS4210
PV180R1D3T1NSLC4240
PV180R1D3T1NFWS4210
PV180R1D3T1EFWS4210
PV180R1D1T1NFHS4210
PV180L1L1T1NZCC4240
PV140R9K1T1NFRZ+PVAC2MCMNSJW20
PV140R9F3T1NFHS4210
PV140R1K8T1NFDS4210
PV140R1K1T1WFWS4210
PV140R1K1T1NTLB4240
PV140R1K1T1NMCB4240
PV140R1K1T1NKLC4240