閉式回路液壓傳動技術(shù)denison

1、閉式回路液壓傳動技術(shù),T1-CP201-A6-18-2002,2002/06/18,2,DENISON 發(fā)展歷史,成立于19301955年 Denison 售與 American Brake Shoe 后改名為 Abex1963年買進(jìn)德國 Hilden 工廠及 法國 Vierzon 工廠1986年 Denison 賣給 Hägglunds1993年 Denison 賣給了私人投資著1997年 Denison 上市

2、1999年 Denison 購買 Lokomec2000 Denison 購買 Calzoni2001 Denison 在中國購買了生產(chǎn)葉片泵的上海液壓泵廠2002 ?,2002/06/18,3,DENISON 今日,49 Denison Facilities in 16 countries.Manufacturing facilities in USA, France, Germany, Finland, Italy and

3、China.193 Distributors in more than 52 countries.Total sales of in excess of $160 million USD.,2002/06/18,4,DENISON 今日,USA - Piston pumps/motorsFrance - Vane pumps/motorsGermany - Directional and pressure valvesItal

4、y - High speed low torque motorsFinland - ManifoldsChina - Vane pumps (Vickers V10, V20),2002/06/18,5,DENISON 液壓泵及馬達(dá)家族,2002/06/18,6,金杯系列液壓泵及馬達(dá),,2002/06/18,7,易產(chǎn)生誤解的術(shù)語和概念,開環(huán) – 開式回路閉環(huán) – 閉式回路 / 傳動（容積式調(diào)速回路）增壓（Boost）- 補(bǔ)油（R

5、eplenishment）-充液（Charge）更油閥（Scavenge Valve）- 沖洗閥（Purge Valve）- 熱油梭閥（Hot Oil Shuttle Valve）排放系統(tǒng)（Eductor System）- 回收系統(tǒng)（Reclamation System）- 真空系統(tǒng)（Vacuum System）,2002/06/18,8,典型回路，液壓缸伸出,開式液壓傳動回路,,2002/06/18,9,液流換向使液壓缸縮回,開式

6、液壓傳動回路,,2002/06/18,10,開式液壓傳動回路,回路中油液按單一方向從液壓泵輸出至液壓閥或液壓閥組；液壓泵可以是定排量（ 容積排量）；輸出流量恒定，取決于液壓泵的規(guī)格和轉(zhuǎn)速。液壓泵也可以是變排量不需要流量時，盡管液壓泵仍在運(yùn)轉(zhuǎn)，但不輸出壓力油。,,2002/06/18,11,所需的液壓控制閥有：壓力控制用溢流閥；對帶壓力補(bǔ)充（恒壓）變量功能的變量泵仍需一個安全閥方向控制閥；典型的是滑閥型電磁或電液方向閥流

7、量控制閥，用于控制執(zhí)行機(jī)構(gòu)的速度。要求變速時選用；也可以采用復(fù)雜的泵控調(diào)速。,開式液壓傳動回路,,2002/06/18,12,執(zhí)行機(jī)構(gòu)可以是液壓缸或液壓馬達(dá)需要的其它裝置有:濾器油液冷卻器油箱壓力表液位計(jì)或液位控制開關(guān),開式液壓傳動回路,,2002/06/18,13,典型的閉式回路液壓傳動裝置,典型的閉式液壓傳動回路由液壓泵直接與液壓馬達(dá)連接組成通常采用定量液壓馬達(dá),,2002/06/18,14,基本閉式液壓傳動回路,

8、,,問題： 內(nèi)部泄漏會引起液壓泵產(chǎn)生氣穴現(xiàn)象,,2002/06/18,15,基本閉式液壓傳動回路,加入充液 / 補(bǔ)油泵,,,,,,,,補(bǔ)油泵的加入容許主泵提高工作轉(zhuǎn)速,,,,液流方向,,2002/06/18,16,基本閉式液壓傳動回路,可雙向工作,,,,,,,,,,,,,,,,液流方向,,2002/06/18,17,基本閉式液壓傳動回路,加入更油梭閥，以使回路中的油液得到冷卻,,,,2002/06/18,18,,,,,,基本閉式液

9、壓傳動回路,同樣, 具有雙向更油的作用,,,,,,,,,,2002/06/18,19,基本閉式液壓傳動回路,加入壓力補(bǔ)償（恒壓）變量監(jiān)控功能.由系統(tǒng)壓力直接作用，響應(yīng)快,,,,,,,,,,,,,,,,,,,2002/06/18,20,,,,,,,基本閉式液壓傳動回路,加入伺服變量控制器，組成完整的閉式液壓傳動回路,,,,,,,,,,,,,,,,,,,2002/06/18,21,開式及閉式液壓回路圖,2002/06/18,22,閉式回路

10、用液壓泵,閉式回路用液壓泵通常為：變量柱塞泵；伺服變量控制；具有抗超速（過中）負(fù)載能力；變量斜盤能定位在±19°范圍內(nèi)的任何擺角位置上；輸出流量可以兩個方向上變量 ，與斜盤的擺角成正比。,,2002/06/18,23,閉式回路用液壓泵,最大擺角 = 最大流量,,,,,,,,,2002/06/18,24,閉式回路用液壓泵,擺角減小 = 流量減小,,,,,,,,,2002/06/18,25,閉式回路用液壓泵,擺

11、角為零 = 無流量輸出液壓泵仍在運(yùn)轉(zhuǎn),,,,,,,2002/06/18,26,閉式回路用液壓泵,斜盤擺角方向相反= 液流方向 相反液壓泵仍按原方向運(yùn)轉(zhuǎn),,,,,,,,,2002/06/18,27,閉式回路用液壓泵,最大反向擺角 = 最大反向流量,,,,,,,,,2002/06/18,28,金杯泵技術(shù)參數(shù),2002/06/18,29,金杯泵結(jié)構(gòu)剖視,傳動軸后部無軸承；此種結(jié)構(gòu)容許較大的后部通軸傳動功率。,控制閥塊(包含全部所需閥

12、件),缸體軸承,凸輪式斜盤組件,傳動軸軸承,補(bǔ)油壓力,泄油壓力,吸口壓力,出口壓力,內(nèi)部零件,殼體,先導(dǎo)控制壓力,,2002/06/18,30,金杯系列產(chǎn)品優(yōu)點(diǎn),采用缸體大軸承，具有抗負(fù)載沖擊的防護(hù)能力；凸輪式斜盤和斜盤支座結(jié)構(gòu)，具有響應(yīng)快速、平穩(wěn)的特點(diǎn)；模塊化的伺服變量控制器，控制功能柔性化；模塊式的控制閥塊，便于維護(hù)、修理。,,2002/06/18,31,缸體軸承,液壓泵工作時所有內(nèi)部作用力的合力可分解為一個軸向力和一個徑向力

13、；缸體軸承將徑向力直接傳遞到殼體上，使傳動軸不承受任何徑向力；結(jié)果：缸體不會與配油盤產(chǎn)生脫離或傾斜現(xiàn)象。,,2002/06/18,32,凸輪式斜盤及斜盤座,軸向力傳遞到凸輪式斜盤和斜盤座上，而不是耳軸軸承上；該極大的軸向力最終由殼體承受。,,2002/06/18,33,伺服變量機(jī)構(gòu),凸輪式斜盤和斜盤座結(jié)構(gòu)為采用Denison 獨(dú)特的伺服變量機(jī)構(gòu)創(chuàng)造了條件；圖中小耳狀物體為腰形變量擺動液壓缸的活塞；,葉片式活塞,變量擺動缸,,20

14、02/06/18,34,伺服變量機(jī)構(gòu),小尺寸的變量擺動缸（兩側(cè)各一個）提供了變量的快速響應(yīng)；斜盤擺角的拉回，需要較高的伺服控制壓力變量擺動缸的雙作用設(shè)計(jì)，允許疊加壓力補(bǔ)償變量監(jiān)控功能 (所有金杯系列液壓泵的標(biāo)準(zhǔn)配置)；,,2002/06/18,35,伺服變量機(jī)構(gòu),變量缸的信號輸入機(jī)構(gòu)由連在斜盤上的伺服板和與伺服輸入軸相連的伺服臂組成。,伺服板,伺服臂,伺服靴,伺服旋轉(zhuǎn)輸入軸,,2002/06/18,36,伺服變量機(jī)構(gòu),當(dāng)輸入信號使

15、伺服臂移動時, 伺服控制油通過滑靴進(jìn)入相應(yīng)的變量葉片腔；另一葉片腔則與殼體泄油相通；變量斜盤在變量葉片的推動下產(chǎn)生擺動。,2002/06/18,37,伺服變量機(jī)構(gòu),伺服板通過伺服桿與凸輪斜盤相連,隨斜盤移動相同的擺角，伺服板的移動量即為位置反饋信號；當(dāng)斜盤到達(dá)要求位置時，伺服滑靴又將伺服板上的控制通道封堵，斜盤停止移動。精確的位置控制；對任何飄移均有自糾正功能。,2002/06/18,38,伺服變量機(jī)構(gòu),當(dāng)輸入信號使伺服臂移動

16、時，伺服板將隨之移動并在達(dá)到要求的位置時將控制通道關(guān)閉；精確的位置控制；對任何飄移均有自糾正功能。,,,,,,,,,,2002/06/18,39,圖形符號原理詳圖標(biāo)示外部接口代號,金杯泵圖形符號,可選外部濾器隔離堵塞,注：:對P24/30泵，無此內(nèi)部通道，只能采用外部過濾。,,,2002/06/18,40,P 6, 7, 8 泵液壓原理圖,P6, 7, 8 in3 排量泵液壓原理圖,,2002/06/18,41,P 6, 7

17、, 8 泵液壓圖形符號,,控制器,選用外部濾器時的封堵螺塞,,,2002/06/18,42,P 11, 14 泵液壓原理圖,P11, 14 in3 排量泵液壓原理圖,,2002/06/18,43,P 11, 14 泵液壓圖形符號,,控制器,選用外部濾器時的封堵螺塞,,,2002/06/18,44,P 24, 30 泵液壓原理圖,P24, 30 in3 排量泵液壓原理圖,,2002/06/18,45,P 24, 30 泵液壓

18、圖形符號,,控制器,P24/30泵無內(nèi)部通道，只能采用外部過濾。,2002/06/18,46,金杯泵控制閥 塊原理圖,座閥型設(shè)計(jì)結(jié)構(gòu)溢流及順序閥功能,,2002/06/18,47,壓力遙控,,,,,,,,,,,,,同時控制兩側(cè)壓力；輸出扭矩控制。,,2002/06/18,48,壓力遙控,,,,,,,,,,,,,兩側(cè)壓力分別控制,,2002/06/18,49,控制閥塊爆炸圖,補(bǔ)償壓力調(diào)節(jié)以及補(bǔ)油壓力先導(dǎo)級,,2002/06/18,50

19、,使用新V（遙控）口,,2002/06/18,51,模塊式的伺服控制器,由于輸入信號與變量機(jī)構(gòu)之間的唯一連接接口是伺服臂與伺服靴，故任一控制器均可與任何金杯泵連接；(或任何金杯變量馬達(dá)),,2002/06/18,52,主（伺服）控制型式種類,,2002/06/18,53,1** 型手動螺釘調(diào)節(jié),該型控制通常用于變量馬達(dá)，要求具有兩種速度或扭矩的工況；由彈簧偏置在最大排量，負(fù)載增大壓力升高后由補(bǔ)償變量功能使排量減至最??；最大及最小排

20、量均可用螺釘手動調(diào)節(jié) 。,,2002/06/18,54,2** 型液動（活塞）控制,2** 是先導(dǎo)液動 2 或 3 位控制；非比例的最大- 最小排量控制 (2A*)；非比例的前向- 停止-反向控制，雙向排量均可調(diào) (2H*)。,,,2A*控制,2H*控制,2002/06/18,55,2M* 型液動（活塞）控制,帶二位電磁方向閥的非比例液動控制,,初始處于最大排量位置,初始處于零排量位置,2002/06/18,56,2N* 型液動（活

21、塞）控制,帶三位電磁方向閥的非比例液動控制,,2N*控制,2002/06/18,57,4** 型手動伺服控制,提供一個手動伺服輸入轉(zhuǎn)軸，輸入信號為轉(zhuǎn)軸的轉(zhuǎn)角；信號轉(zhuǎn)角范圍：+19-19°彈簧對中；輸入軸要求的轉(zhuǎn)動扭矩約為 2.3 Nm(20lbs-in.)。,,2002/06/18,58,4** 型手動伺服控制,,2002/06/18,59,5** 型電液比例控制器,5** 型控制器為老型式，采用射流管式伺服控制；已被

22、 9** 型控制器替代，但要求采用不同的電子放大器操控。,,2002/06/18,60,9** 型電液比例控制器,比 5** 型簡單可靠；便于實(shí)現(xiàn)手動監(jiān)控。,,2002/06/18,61,6** 與 8** 型液動比例控制,6** 型控制為老型式，已廢止；8** 為改進(jìn)型液動比例控制器，是 9** 型控制器的基礎(chǔ)，在 8** 型控制器上組合安裝兩個比例減壓閥即成 9** 控制器。,,2002/06/18,62,Denison “Ve

23、nus” 電子放大（驅(qū)動）器,以微處理器為基本控制器;可接受工業(yè)標(biāo)準(zhǔn)的輸入信號;可控制液壓泵及液壓閥;用于速度和壓力的精確和重復(fù)控制。,,2002/06/18,63,7** 型伺服閥控制器,7** 型伺服閥控制器是高性能、高精度控制器；采用斜盤擺角反饋的閉環(huán)位置控制，從而獲得對排量的精確控制；帶有改進(jìn)型的控制閥塊，使進(jìn)入變量葉片缸的流量得到比其它控制方式更精確的控制；具有多種反饋形式選項(xiàng)。,,2002/06/18,64,7*

24、* 型伺服閥控制器,,2002/06/18,65,,Hi IQ,,2002/06/18,66,新7** 型伺服閥控制器,,采用 Denison的新型4DC01微遮蓋伺服閥;低價伺服閥；標(biāo)準(zhǔn)的ISO安裝面。帶閉環(huán)電控制器的閉式回路液壓泵； 性能等于甚至優(yōu)于標(biāo)準(zhǔn)型 Hi IQ 泵。,2002/06/18,67,新EC01數(shù)/模伺服放大卡,With the new ECO1 Digital control card we can no

25、w control the pump in an analog or digital format.The digital card is in the process of being modified for full PQ control.,,2002/06/18,68,次級變量控制器,次級變量控制器提供了更多的輔助變量功能；自動剎車及中位旁通控制器 扭矩限定控制器,,2002/06/18,69,自動剎車及中位旁

26、通控制器,通用型控制器，殼體經(jīng)修正，帶有附加的連接管道；,,通過附加的連接管道形成一個小流道,在液壓泵處于中位時，將由于中位誤差引起的流量釋放掉，實(shí)現(xiàn)泵的兩工作油口旁通。,2002/06/18,70,自動剎車及中位旁通控制器,當(dāng)有輸入指令信號且斜盤處于有擺角的狀態(tài)下，提供一個油口 (Z) 輸出控制壓力信號，自動對故障安全剎車進(jìn)行松剎；,,2002/06/18,71,中位自動剎車及旁通控制器,,,2002/06/18,72,中位自動剎車及

27、旁通控制器,,,2002/06/18,73,中位自動剎車及旁通控制器,,,2002/06/18,74,扭矩限定變量監(jiān)控,,2002/06/18,75,扭矩限定（恒功率）變量監(jiān)控,補(bǔ)償型次級變量控制器, 位于斜盤擺角指示器側(cè)；該變量控制器對驅(qū)動液壓泵所需的輸入扭矩進(jìn)行限制,當(dāng)轉(zhuǎn)速固定時，即為對輸入功率進(jìn)行限定。防止原動機(jī)超載；壓力升高時，液壓泵的輸出流量響應(yīng)減?。蛔罱K結(jié)果是泵傳動軸的輸入扭矩保持恒定。無需電氣控制裝置；兩個液流

28、方向，可設(shè)定為不同的限定值。,,2002/06/18,76,扭矩限定變量控制器,,,2002/06/18,77,扭矩限定變量控制器原理圖,伺服滑靴控制的節(jié)流口處的壓力降, 在增壓活塞的低壓端形成隨斜盤擺角變化的控制壓力，從滑靴控制節(jié)流口的壓降-流量公式可知：控制壓力與擺角的乘積為常數(shù)，對應(yīng)地，系統(tǒng)壓力與排量的乘積為常數(shù)，即：輸入扭矩為恒值。,,2002/06/18,78,,2002/06/18,79,,2002/06/18,80,,Co

29、mplete Pump 023-81585-0P24L 7R1E 9A2 B00 XC0 M2 81586P6S 8R1C 9A2 B00 0B0 M2 81587T6CRM B06 3R03 B20 A1(024-58096-0/030)T6CCM B28 B05 5R10 D100 (024-58688-0/10),2002/06/18,81,,2002/06/18,82,,Complete Pump 023-81588-

30、0P24L 7R1E 9A2 B00 XD0 M2 81589 + P09 3R1C C10 B0 (022-09477-0) + T6CRM B06 3R03 B20 A1(024-58096-0/030) +T6CCM B28 B05 5R10 D100 (024-58688-0/10),2002/06/18,83,,Complete Pump 023-80720-0 P30L 8R1B 8A2 B00 XFO M2

31、 80721 + P30L 8R1B 8A2 B00 XC0 M2 80722 + T6DCCR B50 B31 B31 3R17 A100 (024-72453-0/17 +TB 012 4R00 A101(024-51702-0),2002/06/18,84,Literature,Literature on linehttp:www.denisonhydraulics.comFTP literatureService, S

32、alesPistonKits-Conversion - AftermarketKits - Gold Cup.pdf (need Adobe Acrobat reader)Order Form 11-01 SF0303.xls,2002/06/18,85,,P*** - 1 2 3,1,2,高效率泵僅 P24 規(guī)格 (對其它規(guī)格省略) H,

33、3,2002/06/18,86,,P6S-*** 4 5 6,4,R – 右轉(zhuǎn) CW RotationL – 左轉(zhuǎn) CCW Rotation,5,6,1 丁腈橡膠4 EPR5 氟橡膠Viton,2002/06/18,87,,P6S-2R1*

34、 7,7,設(shè)計(jì)代號P6 C - DESIGNP7 A - DESIGNP8 A - DESIGNP11 C - DESIGNP14 C - DESIGNP24 E - DESIGNP30 B - DESIGN,2002/06/18,88,,P6S-2R1C-***

35、 8 9 10,8,9,10,NOTE: Code 6 - Replaced by Code 8Code 5 - Code 9 Preferred,2002/06/18,89,,P6S-2R1C-9A2-***

36、 11 12,11,12,2002/06/18,90,,P6S 2R1C-9A2-BOO-***

37、 13 14 15,13,14,15,2002/06/18,91,,P6P-2R1C-9A2-B00-0A1-M2

38、 16,16,M2 = Any special configuration or requirement in this case:1= Pump Mounted : Size, configuration i.e. TB006--WR01-

39、A1-OW (024-51095-0/01)Case drain check valve fitted,P6P-2R1C-9A2-B00- 0A1-M2 07704 Part Number 023-07704-0,2002/06/18,92,,Relevant History Changes,P6S is an “C” DesignP7S is an “A” Design P8S is an “A” Design

40、The design letter has not changed on these pumps for many years however there has been changes on the type of pumps mounted on the rear:Originally T3SB Vane Pump……....014-97836-0Changed to Barnes Gear Pump…..512-42

41、023-0Today we use a TB Vane Pump….024-51095-0/01Also the Hot Oil Shuttle Valve has had an extra port added (P3)The R4V head on these pumps is internally drained,2002/06/18,93,,Relevant History Changes,P11S is a “C”

42、DesignP14S is a “C” Design The design letter has changed on these pumpsOriginal “A” design was a mechanical seal “B” design was a single lip seal “C” design is a double lip sealAlso there h

43、as been changes on the type of pumps mounted on the rear:Originally T3SB Vane Pump……....014-97836-0Changed to Barnes Gear Pump…..512-42023-0Today we use a TB Vane Pump….024-51095-0/01Also the Hot Oil Shuttle Valve

44、has had an extra port added (P3)The R4V head on these pumps is externally drained,2002/06/18,94,,Relevant History Changes,P24S is a “E” DesignP30S is a “B” Design The design letter has changed on these pumpsP24 “A”

45、 design to:“B” design - New mounting flange and housing. To:“C” design - New port block, changed geroters to vane cartridge,end cover, barrel hold down, shaft spline, and auxiliary mounting. To:“D” design - New port

46、block.P30 “B” design to:“B” design - New port block.Also there has been changes on the type of pumps mounted on the rear:T3SB Vane Pump used as internal cartridge (spring vane)The T6C/CC pumps have changed from

47、industrial to mobile and now have the SKF 7305 bearing fittedAlso the Hot Oil Shuttle Valve has had an extra port added (P3)The R4V head on these pumps is externally drained,2002/06/18,95,,S23-15219-0 For P11/14,,

48、S23-15213-0KShaft & Bearing Assembly,,S23-15244-0KShaft Seal Kit,2002/06/18,96,,NOTE:Today Hägglunds use the following:P6,7,8 Type 2 or 3 shaftsP11,14,24,30 Type 7 or 8 shaftsTHE

49、LIP SEAL SHAFTS ARE DIFFERENT TO THE MECHANICAL SEAL SHAFTS AND ARE NOT INTERCHANGEABLE,2002/06/18,97,,2002/06/18,98,S 型后驅(qū)動葉片泵軸承改進(jìn),2002/06/18,99,,2002/06/18,100,,033-57211-0,033-57935-0,033-57214-0 SAE B033-92374-0 SAE

50、B-B033-57315-0 SAE C033-91606-0 SAE D,033-57214-0 SAE B033-92374-0 SAE B-B033-57315-0 SAE C033-91606-0 SAE D,P24 OLD,P30 OLD,Auxiliary Drive Shaft,Coupling,Pump,2002/06/18,101,,Auxiliary Drive Shaft,Coupling,Pump,Ki

51、t Containing Both Parts,S23-17444-0K SAE BS23-17448-0K SAE B-BS23-17446-0K SAE CS23-17450-0K SAE D,P24 NEW,033-93535-0,033-93537-0 SAE B033-93541-0 SAE B-B033-93538-0 SAE C033-93540-0 SAE D,P30 NEW,S23-17445-0K SAE

52、 BS23-17449-0K SAE B-BS23-17447-0K SAE CS23-17451-0K SAE D,033-93536-0,033-93537-0 SAE B033-93541-0 SAE B-B033-93538-0 SAE C033-93540-0 SAE D,2002/06/18,102,,Fault Finding,Loss of servo or replenishingIf servo an

53、d replenishment is lost the usual cause is that the auxiliary shaft has broken. Causes:Too much torque transmitted, the external filter plug is installed, modulation pin missing?Loss of replenishmentThis can be du

54、e to internal problems with the pump or external problems with the system. Isolate the pump to eliminate the system.Pump problems:Replenishment relief spring broken?Ring check in “A” or “B” broken?Wear or failure

55、of internal parts?,2002/06/18,103,,Fault Finding,,Loss of system pressureIf pressure cannot be raised in “A” or “B” ports?The compensator seat may be broken?Is the “V” port being utilised? If so check the fittings an

56、d if possible plug of the “V” port.If pressure is available in “A” and not ”B” or visa versa?Check the pilot flow check valves in ports “VA” or “VB”If system pressure is available but will not rise up to compensator

57、 setting?It is possible that either the compensator cone/seat is damaged or the modulating pinhas worn the hole in the valve block?Cannot reach full system flow?Check the input signal to the control card or servo pr

58、essure to the stroker?The servo pressure should modulate upwards at 40 PSI/1000 or 60 PSI/1000depending on the valve block being used,2002/06/18,104,,,,,Lock Nuts,,Null Adjust,,Back Lash Adjustment,Max Volume Adjust,,2

59、002/06/18,105,,75 - 350 PSI = 1.189”250 - 450 PSI = 1.061”150 - 400 PSI = 1.136”100 - 380 PSI = 1.169” 75 - 435 PSI = 0.957”,0.001” = 1.31 PSI,2002/06/18,106,,Hold down force 1042-1032 lb,Hold down force 1042 - 1032

60、lb,P24,P30,It is important that the hold down on these pumps is applied correctly as per the service information S1-AM015-B.,Note - If the shaft is being replaced the hold down should always be taken off and re applied a

61、fter assembly.Note - The shaft seals on P24 pumps should not be changed without taking off the hold down first.,2002/06/18,107,,What’s NEW and what are we working on ?,Efficiency and noise on all sizes of pumps Testin

62、g a new bearing for the P24/30 pump.Faster response on standard controlsDigital Hi IQ controlA ceramic coated shaft for the lip seal to run on.KitsNew 280 Bar Open circuit pump,2002/06/18,108,,P30+1.5 - 2%,P24

63、,Efficiency,2002/06/18,109,,2002/06/18,110,,2002/06/18,111,,新- 止推滾子軸承,舊- 球面雙排滾子軸承,傳動軸軸承改進(jìn),2002/06/18,112,,,The problem is not the speed of the control but the speed of the pump. The problem was found to be a pressure dro

64、p across this shear seal.To overcome this the seal has been modified to reduce the pressure drop and the orifices in the servo stem enlarged which has increase the speed considerably.例如：P24/30 正常響應(yīng)時間為 1.8 s新響應(yīng)時間為 0

65、.5 s,伺服靴密封改進(jìn),2002/06/18,113,,Kits,Kits have been recently introduced to improve the availability of spare parts, content and range of parts available.As an example - Gold Cup Seal Kits:1 seal kit for all valve blo

66、cks S23-17338-0K which now includes cone, seat and filter.1 seal kit for all controls including the secondary control.A complete seal kit now has all the parts necessary to completely re-seal a pump includingthe vane

67、pump and shuttle valve on Hägglunds “S” type pumpsShafts now come as a shaft and bearing assemblyComplete rotating group kits are now availableAll commonly used parts are available on 24HR delivery as stated i