【精品液壓培訓(xùn)資料】派克：液壓系統(tǒng)基礎(chǔ)知識(shí)(編輯修改稿)
2024-08-28 16:18 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 e quals 8 000 lb s 10 in sq = 8 00 p sip s i02 5 05 0 07 5 01 0 0 01 2 5 01 5 0 01 7 5 02 0 0 0A.Figu re 1 10 (A ) Pre ssu re loss r e quir es f ull l oss o f p ump ou tletC OP Y RI GH T (2 00 1) EA T ON C OR P OR A T IO NCFi gur e 1 1 0 (B ) P res su re loss re qu ire s fu ll lo ss of pum p o utle tCOPYR IGHT (200 1) EA T ON CO RPORA TIONCPum pEl ect ric Mo to rLoad80 00 lbsp si025 050 075 010 0012 5015 0017 5020 004. If 9 .5 gpm is los t th rou gh a leak5. the oil m ust stil l m ove th e p isto n6. Th er e is st ill a 800 0 lb lo ad on the pi ston , t he cyli nde r s till m ove s, b ut at a lo we r ra te o f spe ed . Th e p res su re is s till 80 0 p siB.P um pE lec tr ic M ot orp si025 050 075 010 0012 5015 0017 5020 00Re lief V a lve10 00 p si1. W he n th e fa uc e t is wid e op en , a ll t he p um p f low p as se s un r es tr ict ed2. T he r e is vir tu a lly no p re ss ur e in the system at this time10 gpm10 gpmF igu re 1 1 1 ( 1 of 3 ) P r es su re ca used by restr icti on and li m i ted by pr essure control val veCO P Y RI G HT (20 0 1 ) E A T O N CO RP O RA TIO NCPu mpElectri c Motorp si02 5 05 0 07 5 01 0 0 01 2 5 01 5 0 01 7 5 02 0 0 04. Pressu re i n the syst em increases as the resist ance to fl ow increases.3. The restriction i s not suf ficient to lim it t he quantity of flow out of th e faucet10 gpm10 gpmRelief V alve1000 p siFigure 1 1 1 (2 of 3) Press ure ca used by restrictio n and limit ed by pres sure cont ro l valveC OP YRIG H T (2 001 ) EA T ON CO R PO RA T IONCFigure 11 1 (3 of 3) Pre ssure ca used by restr iction and limited b y pressure control valveC O PY R I G H T (200 1) EA T ON C OR POR A TI ONCPumpElectric M otorp si0250500750100012501500175020226. Pressu re in the system increases unt il the relief valve prevent s any further rise in pressure5. If the rest riction is increased further , the rate of flow will decrease until the f aucet is fully closed, stopping all flow10 gpm5 gpm5 gpm7. The unused flow is di verted over the relief valveRelief V alve1000 p si100 p si200 p si300 p sip sig0501002003004005006007001. T he fl uid can foll ow one of t hree p aths, it wi ll always t ake the p ath of least resist ance. 2. The fluid f ol lows the p ath of least resist ance ( T hrough valve A) becaus e the spring in the valve of fers the l owest resist ance t o flow .ABCA.C OPY RI GH T (20 0 1 ) E A T O N C OR PO RA T I ONCFigure 112 (A ) P aral lel flow p aths100 p si200 p si300 p sip sig050100200300400500600700XABC3. With the p ath through valve A blocked,the p ath through valve B bee s the p ath of l east resist anc e, the pressure in the system bees 20 0 p si.B.C OPY RI GH T (20 0 1 ) E A T O N C OR PO RA T I ONCFigure 112
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