德國(guó)flucom CAE30 P貨期短
IKO軸承斷裂失效主要原因是缺陷與過(guò)載兩大因素。當(dāng)外加載荷超過(guò)材料強(qiáng)度極限而造成零件斷裂稱為過(guò)載斷裂。過(guò)載原因主要是主機(jī)突發(fā)故障或安裝不當(dāng)。軸承零件的微裂紋、縮孔、氣泡、大塊外來(lái)雜物、過(guò)熱組織及局部燒傷等缺陷在沖擊過(guò)載或劇烈振動(dòng)時(shí)也會(huì)在缺陷處引起斷裂，稱為缺陷斷裂。應(yīng)當(dāng)指出，軸承在制造過(guò)程中，對(duì)原材料的入廠復(fù)驗(yàn)、鍛造和熱處理質(zhì)量控制、加工過(guò)程控制中可通過(guò)儀器正確分析上述缺陷是否存在，今后仍必須加強(qiáng)控制。 ABB ON6KB S6048 15T
CIRCLE SEAL 2359R-1PP
03701504 HDP30.27D1-04S3-LSC/SC-V-C
BERGER LAHR （A11）SD326DU25S2-Y
小強(qiáng)工控 CARLO GAVAZZI PS31L-MT02RC-T00
RIEGLER SWVM128LST
BERNSTEIN 1015300215 CS-3000 HV 800/150 RAL9006
automationdirect D3-FUSE-3
EUROTEK 525 ET-MRZ16/24DC/D25-M/M20/SIPRO/N
SCAIME 561825
DOLD 51590 BG5925.22/901/61 DC24V
Phoenix 1212160 模塊
035636AN REAR SECTION KP20.8D*- *S1-LOC/OC-*S4-N-P-FS
Klaschka SIDENT/B-40-fq100-4O1 Sach-Nr. 13.14-68 感應(yīng)傳感器
FEAS SNT1212
MD MICRODETECTORS傳感器MDI58B 848
automationdirect C1FC50XE Thumbnail
CIRCLE SEAL D559B-8M-10
SWAGELOK SS-68TF32 材料304
automationdirect DL205 discrete output module, 16-point, 12-24 VDC, sourcing, 2 isolated common(s), 8 point(s) per common, 0.1A/point, 1.6A/module. Removable terminal block included.
DOLD 48680 EH7666.21 AC50/60HZ 24V 0,2S-60H
小強(qiáng)工控 CARLO GAVAZZI DUB71CB2310V
DA2D3114040/ES DM3403241-03/12-G KFE11024
VIVOIL X2R5901EDDF
DEMAG MKA-2 110-120V
DOLD 55095 EC7610.22/034 AC50/60HZ 230V 60M/5M
automationdirect KMF325V Thumbnail
Beck 901.10111X4，Art-Nr.Beck:14042-0014 壓力開(kāi)關(guān)
hydac EDS 3348-5-0016-000-F1 壓力開(kāi)關(guān)
RIEGLER 246.65
Turck BL20-4DO-24VDC-0.5A-P 總線模塊
020146FM PLP20.14D0-31E2-LEB/EA-N-EL
Phoenix 2804610 電涌保護(hù)器
Schneider Electric Energy GmbH 9080LBA363106 感應(yīng)傳感器
FRIZLEN FZA200X45F-24DHM
Andreas Maier Order no.67983 Article no.6925D-40-1 夾具
RIEGLER 229.01-0,9
小強(qiáng)工控 CARLO GAVAZZI PS42L-BT02RH-T00
DOLD 58206 BD9080.12/001 3AC415V UH AC415V
03576209 MOTOR KM30.51D0-04S3-LEB/ED-N
SICK ATM60-P4H13*13 編碼器
KENDRION 32 07332B40 LIN；0-500VAC OUT；0.445 MAX；2ADC
MD MICRODETECTORS傳感器MDI58C 385
小強(qiáng)工控 CARLO GAVAZZI EI3015PPOPL
ASTROSYN MOTOR L267RE 馬達(dá)
小強(qiáng)工控 CARLO GAVAZZI PS31L-NT12RK-T00
RIEGLER 377.01
MD MICRODETECTORS傳感器LS2ER/90-030S
fristam 弗里森機(jī)封
MD MICRODETECTORS傳感器MDI63D 1810
VIVOIL X0F1121NBBA
hydac EDS 3446-3-0250-000 Mat.Nr.908165 壓力開(kāi)關(guān)
SELET傳感器2.540 BZ
LINMOT直線電機(jī)PL01-12x480/440-HP
automationdirect 2611200SBA
automationdirect TK-E5-2600
03571045 KP30.61R0-83E3-LED/EB-N
Maximator 3640.0519 VP54.02.36 墊圈
automationdirect Bulkhead connector, M12 nut 8-pin female to pigtail connection, 24 AWG, 1.6ft/0.5m cable length, polypropylene conductor insulation material. Mounting nut(s) included.
68603827 PLP30.27-04S5/20.20 D/FS-L
VIVOIL X0I0632ABBA
RIEGLER 29 A-MJ
SCHAEVITZ GCD-SE-600 TYPE 4080
BuTech 30UV43V 高壓閥
MD MICRODETECTORS傳感器MDI58B 2724
VIVOIL X1P2051DBBA
小強(qiáng)工控 CARLO GAVAZZI PD180CBT30MU3384
RIEGLER 158.1006-K
hydac ZBE03 接頭
PureLink 1920058(DE0020-1) 感應(yīng)傳感器
WIKA 7165167 壓力表
AECO FT1000560 FT18SM-CBE LC10
06541078 LVP 75D-06S7-LMF/QD-N-LS2-AS5/04
BAUMULLER GDM120N-528/0750
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79913121 KP30.38/30.38 S
ASM CLMS1-JA1NC012000
EMC (RB2C-250/084 K202 1-1847/245W-230V-60/50HZ(E176685)
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MEGATRON MMR1011
小強(qiáng)工控 CARLO GAVAZZI G34960006700
FEAS Artikel-Nr.:584060
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Multi-Contact BP/35 訂貨號(hào)：30.0101
RIEGLER 747.01
RIEGLER 1115.20-ES
03630090 MOTOR KM40.73R1-34S8-POF/OF-N-H CSL
小強(qiáng)工控 CARLO GAVAZZI PS31L-MT20RY-T00
BARKSDALE UAS3V3 帶UT探頭0-100℃
Beckhoff IP5209-B200-1000 編碼器盒
HONSBERG HD1K-025GM005
HBM ClipX BM40
Turck RKC4.4T-2/TXL;Nr:6625503 線纜
DOLD 60034 RP5995S AC230V ERWEITERUNGSMODUL
79909300 KP20.8/20.8 S/FS
Schneider K1SD217B7XS 鑰匙開(kāi)關(guān)現(xiàn)貨
MD MICRODETECTORS傳感器MDI63F 2971
MD MICRODETECTORS傳感器AM1/AP-4A8R
06879550 FP40151D0-19T1-LGH/GF-N
JENA LIA-20-801-WA
AECO I30000075 SI30-CE15 NPN NO+NC
AECO FTQ000024 FT13-CF NPN NC
RIEGLER 190/11-25
automationdirect D64160DT-MC Thumbnail
CABUR XCSF5D
MD MICRODETECTORS傳感器MDI58B 1047
VIVOIL閥9RD0431
LIKA型編碼器AM5813/4096P
REXNORD 9670-50-003
小強(qiáng)工控 CARLO GAVAZZI TCSV12K301000
automationdirect TAP-ACC08 Thumbnail
EOS MVPS800-1012 電源
DOLD 50670 BA7924.21 AC230V 2-20S
MD MICRODETECTORS傳感器FAIZ/BP-1A
Noding MeBtechnik GmbH PDM80 2510-012
DOLD 53080 IK9171.11/031 3AC500V 0,55-1,05UN4%
03591123 PLP30.27D0-A8U3-LOF/OD-N
CIRCLE SEAL 5180T1-6MP
MD MICRODETECTORS傳感器MDI58B 1399
GekaKonus GmbH Art-Nr：31000034 疏水閥
DOLD 48484 IK8800.11 AC50HZ 220V
小強(qiáng)工控 CARLO GAVAZZI MOFR-M12-8
MD MICRODETECTORS傳感器MDI38F 2129
德國(guó)perske KNS 22.08-2 電機(jī)
RIEGLER 212
GEMU 68725D17341711/N
STAUBLI 33.0370 CT-POF/SL
02011720 FRONT SECTION PLP20.6,3D0-82E2-L**/BC-S7-N-EL-A FS
MD MICRODETECTORS傳感器MDI63G 1089
LIKA編碼器IT65-L-1024ZCP1CR 1024PPR-RAD
MD MICRODETECTORS傳感器MDI63G 289
小強(qiáng)工控 CARLO GAVAZZI CONB14NF-SP2W
ALLWEILER NT65-250U3.1DW10
Peter Electronic VB 400-6L SO6
Beck GmbH 930.83.222511 差壓傳感器
automationdirect E40M250MD-M
LORENZ扭矩傳感器D-DF30/M410-G21
SUN DWDA-MAN-224
MD MICRODETECTORS傳感器MDI63D 2201
02014244 FRONT SECTION PLP20.14D0-82B2-LEB/EA-N-EL-A FS
sunfab SC-056-R 泵
DOLD 35946 AA9906.82/200 AC/DC24-240V 5-100S
automationdirect HT8GBWBV7 Thumbnail
KUBLER 8.5824.3822.2048
DOLD 61292 LH5946.48/61 20-400mV UH AC115V
ZIMMER HK2501A
PMV F5ISNU-NAM420-23-PV9DA-Z = F5-NAM-420現(xiàn)貨
MD MICRODETECTORS傳感器FAIZ/BN-1E
Peter Hirt T501FDC24 傳感器
parker PVP16364R26A4M12 泵
SIEMENS 7ME6910-1AA30-1AA0 流量計(jì)
MD MICRODETECTORS傳感器QXR/C0-2A
小強(qiáng)工控 CARLO GAVAZZI UA18CLD08NPTR
RIEGLER 15.DMA.50005
MD MICRODETECTORS傳感器MDI63A 978
SICK PM3S96-00240020 NR:1040619 編碼器
LIKA編碼器I58-H-500ZCZ46R
GIVI MISURE NCS T1C 720mm S.N.0113284 00517 04227
danfoss bauer BG30Z-11/D06LA8/C2 0.06KW s-nr:1921612-4 電機(jī)
automationdirect CR-735 Thumbnail
Turck NI8U-M12-AP6X Nr:1644100 接近開(kāi)關(guān)
MD MICRODETECTORS傳感器MDI58B 1872
automationdirect LR-47P5 Thumbnail
RIEGLER 148.018-4
SELET傳感器B07G81NO
65900610 PLP10.1-81E1/10.1 D/EL-FS (O&S)
SIGMATEK DAI402
ELTRA ER63E10000Z5L10S3MR
BEI編碼器GHT514-1024S024; S/N: 201302082608 / 1
MD MICRODETECTORS傳感器MDI63F 1328
MD MICRODETECTORS傳感器MDI58F 2880
RIEGLER 13.DM.12015
SPIETH MSR160x3.0
RIEGLER 15.DMI.63060
EUROTEK 8359 ET-RF 4008-FSN
PLP10.1,5-81E1/10.1,5 D/FS-EL
IPR TK-160-R Artikel-Nr.15030559 + 12-polige Buchse EC12MIL-IP65.R
DEMAG KMF 80 A 4
automationdirect DL205 analog b module, 4-channel, current, 12-bit, b current signal range(s) of 4-20 mA, external 24 VDC required.
MD MICRODETECTORS傳感器MDI58B 1707
RIEGLER 290.932
automationdirect CWC07-00-22R02
小強(qiáng)工控 CARLO GAVAZZI RD0605-D
parker W08LCF 管接頭
HAYWARD SY065012ET20A
DENISON T6D-028-1-R-01-B-1 serial no.97D25 079
EAO 92-960.0 開(kāi)關(guān)附件
SCHNEIDER CCT15368 光敏開(kāi)關(guān)
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SUN DTDA-MCN+770-224
施耐德 Shchneider ZCKE05 拐臂
R+W MK2 20/44 8/9 聯(lián)軸器
KELLER 592x490 292 tief NO.8000103453
06877650 FP30.17D0-19T2-LGD/GD-N
SELET傳感器XTM56/220
TURCK 6914217 RSSD-RSSD-441-0，5M/S2174
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DEMAG 71881033
LABOM CV3110-AI056-C1059-OA1620
IFM AC1212 電源模塊
IFM IE5338
德國(guó)BTR KRA-M4/1 24V 繼電器
RIEGLER GEM3328LSTNBR
RIEGLER 242.99
TWK IW254/40-0.5-T(with the male and female plugs)
GESTRA RK71DN80/PN16 訂貨號(hào)11362
LEONARD LNSW03 MNS serial no:31110503 凸輪開(kāi)關(guān)
MD MICRODETECTORS傳感器MDI58F 1516
0357162S FRONT SECTION KP30.38D0-06S8-LGF/GF-55N4-N-A-CSL
microsonic lpc-25/CDD/M18 接近開(kāi)關(guān)
ABB SKKH280/20E H4（ABB代碼64715879 1套含3個(gè)）
德國(guó)flucom CAE30 P貨期短
光譜儀分析原閥座材質(zhì)，保證更換的閥座材質(zhì)滿足工況使用要求。球體密封面局部沖刷深度4mm，寬5mm的凹坑或槽，可通過(guò)補(bǔ)焊局部打磨，外圓車加工，保證球體圓度。然后噴涂硬質(zhì)合金。更換失效或斷裂的蝶形彈簧或圓柱彈簧，采用包覆橡膠環(huán)形的背壓彈簧。對(duì)密封面拉傷深度3mm的球體、閥座，可采取外圓加工車去拉傷層，進(jìn)行球體表面噴涂合金層1mm，增加涂層厚度，按照球體噴涂后的尺寸設(shè)計(jì)加工閥座，后進(jìn)行研磨。
LIKA編碼器CK41-Y-4096BNF26R 4096PPR.RAD
EGE IGMF005GSP P30710 24V 400mA 帶6M線
IPD電源GRN-80-1007 OVP
SIEMENS 6SL3352-1AG38-1DA1 電源
THERMO A027981
MD MICRODETECTORS傳感器MDI63D 430
019984AC PLP20.14D0-12B4-LBE/BC-N-EL-AV
Barksdale GmbH UPA2-0431-314 壓力傳感器
automationdirect 270L050NG Thumbnail
Ahlborn Mess- und Regelungstechnik GmbH MA24501 數(shù)據(jù)采集器
MD MICRODETECTORS傳感器MDI58B 1882
PLP20.31,5/20.16 D/FS-E
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RIEGLER 229.04-10,0
RIEGLER 191/1
Ebm A2D250-AD26-05 風(fēng)扇
EA ZA310029-NE092100
Beck 930.8022251 壓力測(cè)試單元
DOLD 63162 BA9053/110 AC2-20A AC110V
STASTO 600.200.32111 ，50~200bar，05/46CE 壓力傳感器
06527024 LVP 30D-32S5-LMD/QB-N-RP0-AS1/03
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0363013C KP40.109S0-34S8-LOF/OD-N-CSC
RIEGLER 217-DE
MD MICRODETECTORS傳感器MDI63A 910
03591651 PLP30.38D0-A8U3-LMD/MD-N
HARTING 9200032711 接插件
FINDER 56.32.9.220.0040 12A.250V 220V DC
RIEGLER FU 635-M-4
kendrion lcl070080A00 24vdc I=1.54A s=30mm f=41N
MD MICRODETECTORS傳感器MDI63D 815
03780882 HDP35.90D1-34S8-LMF/ME-N-BZ
EA IW111622
MD MICRODETECTORS傳感器MDI58G 2207
STAUBLI K81558457ET
STAUBLI B24144386
Riegler & Co.KG TYP 247.12 接頭
RIEGLER EGEM1410LSTKEG
RIEGLER 227.55-36,4
小強(qiáng)工控 CARLO GAVAZZI RGS1A60D92KKEHT
65117650 LVP 75-70Z2-LS2/LVP 75-LS2 D
MD MICRODETECTORS傳感器UK1C/GP-1ASY
MD MICRODETECTORS傳感器MDI58F 137
MD MICRODETECTORS傳感器MDI63G 1376
DOLD 24634 AD8851.14 AC50/60HZ 110V
LIKA編碼器IP58-H-PROGZCW46 PROGR.
LAIPPLE KEB M71B4
EA VT451510
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DEMAG ZBF71 A4 B003 NR:74750169
MD MICRODETECTORS傳感器MDI63G 720
GUILLMIN K2627A 碾鉚頭
HBC QA108600
VIVOIL X2R6307FSSE
SIEMENS 7ME3530-1AA00-0FA1-Z K02 流量計(jì)
LVP 75-LS0/75-LS0-E D
RIEGLER 10.DMD.50100
DOLD 16599 AD 866.14 AC50/60HZ 230V
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ATOS AGIR-10/210 油壓傳動(dòng)閥
Norelem 03154-113020 ---
MOTOR HDM 35.112R4-34S8-LME/ME-N
MD MICRODETECTORS傳感器MDI63A 575
BARKSDALE UAS3V3
SCHNEIDER IMD-IM9-OL
RIEGLER MSN290SKMB114
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67614705 PLP20.6,3-LGD/GD/20.6,3-LGD/GD/20.4-LGD/GD D FS L
ELTRA ER40A600S5/28P6S3PR2
GE 04F12y38T05 ID.8000602 溶氧儀探頭
MAYR ROBA-STOP-M K1127801 8190469 500/891.010.1S 24V 143W 500NM
DG2D2124025/NS EA300169/M MBTG2Z322266025/B
03589990 PLP30.34R0-83E3-LGF/GF-N
VESTA E52W2S012
NORELEM 06320-310
RIEGLER 222.07-2,2
Turck FCS-G1/2HC4-NAEX0/L065 6870355 信號(hào)模塊
GMW LAN / TCP
小強(qiáng)工控 CARLO GAVAZZI RA1225H06POS
StS Coupling GmbH SWK/BK-30 安全離合器
EGE - S30864 IGMF 30864
automationdirect G25-SLV-4LS
MD MICRODETECTORS傳感器MDI58G 189
Turck NI20-CP40-FZ3X2/S97 Nr.1340123 接近開(kāi)關(guān)
Exsys EX-41052
MD MICRODETECTORS傳感器MDI58F 2390
DATALOGIC 931061318 DS4800-1000
現(xiàn)貨 行程開(kāi)關(guān) 618.6740.644
HYDAC K3S200-T
SIEBERT S102-F4/14/0G-001/0B-K0 顯示面板
小強(qiáng)工控 CARLO GAVAZZI PS31R-MT03N7-Y00
RIEGLER 259.14 N
MD MICRODETECTORS傳感器MDI58G 1557
KP30.56D0-04S5-LED/ED-N
MD MICRODETECTORS傳感器MDI58B 559
MOTOR PLM20.14D0-03S1-LOC/OD-N
BARKSDALE BNA-S22-DN20-800/1-VA30/02-MA-AR-3GK03-XT-SK
EA IK111921
67052302 PLP20.6,3-03S1-LOD/OC/20.6,3-L/OC-S7-VPIF(210) D/FS-EL AV
Murrelektronik 3000-36001-2000060 固態(tài)繼電器
03805168 HDP35.80B*- * *-LMF/ME- *F0-N-P
DOLD 53376 BA9053/012 AC0,5-5A AC42V 0-20S
02004121 PLP20.8R0-82E2-LEA/EA-N
CIRCLE SEAL安全閥止回閥9359B-2PPQ
microsonic crm+35/IU/TC/E
MTS RHM0290MH021A01
LAPP 0026152/5G1.6
80055052 KP40.87-CSC/20.11,2 D/FS 80055058 KP40.87-CSC/20.25 D/FS
lectroetch LNC-3電解液
MD MICRODETECTORS傳感器MDI58B 1509
automationdirect 3TA401K Thumbnail
小強(qiáng)工控 CARLO GAVAZZI PS31L-NT02LA-T00
RIEGLER 110.82
KTR BoWex M-24 1.0 Φ14 - 1.0 Φ24 聯(lián)軸器
MD MICRODETECTORS傳感器MDI63G 2227
DEMAG SET ROLLER GUIDES FOR RS 160 B NR：81130344
HOHNER AW158S-102R051-500 編碼器
Spieth MSR 85.2 鎖緊螺母
小強(qiáng)工控 CARLO GAVAZZI PS21K-MT02R3-T00
DOLD 58874 BH5915.08/01MF0 DC24V
MD MICRODETECTORS傳感器MDI58F 853
automationdirect GH15ET-3-00A
MD MICRODETECTORS傳感器MDI63A 930
HDP30.51-05/30.51 S
DOLD 62246 SP9277.39/010 AC220-240V 0,1-1A
WEH weh-AUFTRAGS NR:156209 ARTIKEL-NR:B200B-141318
CIRCLE SEAL 264S-1PP
DOLD 56856 BA9053/410 AC5/10/25A AC/DC24-80V
HYDAC EDS344-2-100-000
小強(qiáng)工控 CARLO GAVAZZI PH18CNR65NAM1SA
71002540 HDP30.43-33-LGG/GF/30.43-LGG/GF D1
EA ZD311404-ED620632
suco 0180-45803-1-042 G1/4 壓力開(kāi)關(guān)
automationdirect 400MXL025PP
ABB AFPS-01C（AFPS-11C）
BURSTER 8712-50
PLP20.11,2-03S1-LOF/OC/20.8-L/OC-S7 S/FS AV-EL
RIEGLER 202
automationdirect FA-GFCI
MD MICRODETECTORS傳感器UK1F/G7-1ASY
03798850 HDP35112S0-06S8-LMF/ME-60F0-N-A
03569206 REAR SECTION KP20.20D*-12 *-LOD/OC- *N4-N-P
Turck NI12U-P18SK-AP6X 接近開(kāi)關(guān)
MD MICRODETECTORS傳感器MDI63F 1702
RIEGLER 12.DMI.100010
TR9420A 鋼廠角位移傳感器
PILZ PNOZ X10.11P 24VDC 6n/o 4n/c 6LED ,Art-Nr.: 777750 繼電器
KUBLER 8.5868.1231.3112 現(xiàn)貨
DOLD 52803 BN3081.63 DC110V
Turck NI25-CQ40/S1102 15M No.1602413 感應(yīng)傳感器
DOLD 55820 BA9054/113 AC0,5-5V AC230V
FHF 21226107
RIEGLER MV 1229/0
00372701 PLP10.5 D0-86E7-LBB/BA-N-EL FS
MD MICRODETECTORS傳感器FAI6/BN-3E
RIEGLER 153.038-6
MD MICRODETECTORS傳感器MDI58C 1495
EA SK711068-ED620702
ARCOS 25CA-50/30-0530/83
kistler 1661A5 電纜
RIEGLER 8755.038-14 ES
OLYMPUS 27MG-D794
automationdirect AVS-3313-120A Thumbnail
小強(qiáng)工控 CARLO GAVAZZI PD140FNT60QMU02C
KARL KLEIN DNG 3-9,8 WS;LINKS P/N:51331-1.030
RIEGLER 214-K
VIVOIL X2R5507FRRE
03676803 HDP30.34D0-04S1-LGF/GE-N
DG2D3128040/OS FG182523 MEMG2Z342248010
KUEBLER 8.5823.1832.0100 傳感器
DOLD 25267 EF7616.24 AC50/60HZ 110V 0,2S-60H
VIVOIL閥9RD0245
IPD電源DC4-70-1001
CIRCLE SEAL C249A-6Q
automationdirect TTP-MEC1-11 Thumbnail
HAMMELMANN 00.05877.0039
SBA ETKU 165-0102
HBM C9C/200N HILMA 8.2135.0132 104KN RIEGLER 727-CDE Wandres 1227-842 噴嘴 TRI-TRONICS傳感器, 電眼SMARTEYE(SEWLK01) XB5AW3365C0DOLD安全繼電器56704 IL5990 AC/DC24V 10S BURKERT 電磁閥44568
德國(guó)flucom CAE30 P貨期短
從圖1可看出，以關(guān)小閥門(mén)來(lái)控制流量時(shí)，水泵本身的供水能力不變，揚(yáng)程特性不變，管阻特性將隨閥門(mén)開(kāi)度的改變而改變。這種方法操作簡(jiǎn)便、流量連續(xù)，可以在某量與零之間隨意調(diào)節(jié)，且無(wú)需額外投資，適用場(chǎng)合很廣。但節(jié)流調(diào)節(jié)是以消耗離心泵的多余能量(圖中陰影部分)來(lái)維持一定的供給量，離心泵的效率也將隨之下降，經(jīng)濟(jì)上不太合理。變頻調(diào)速工況點(diǎn)偏離區(qū)是水泵需要調(diào)速的基本條件。當(dāng)水泵的轉(zhuǎn)速改變時(shí)，閥門(mén)開(kāi)度保持不變(通常為開(kāi)度)，管路系統(tǒng)特性不變，而供水能力和揚(yáng)程特性隨之改變。
