RE 8/0.98 8/0.9 Flow Divider Type MHF, eries X (Differential lock) ize to up to 0 bar up to 00 /min RE 8/0.98 Replaces: 0.9 Characteristics: Double-acting (dividing and summating) flow divider Fixed division ratio uitable for open and closed circuit Type of connection: Threaded connection (size ) E-flange connection (size8 to ) standard division ratios Optionally with or without free wheel operation Flow division function: hydraulic or electrically selectable Optionally integrated pressure supply valves Wet pin DC solenoid H/ Type MHFER..X/H... ttention! The selection and release of the type MHF flow divider can only be authorised by Rexroth Hydraulics, Mobile hydraulics product group. Function description, section Flow dividers type MHF without or with free wheeling operation are primarily used as a differential lock on hydrostatic drives with parallel switched hydraulic motors. Flow divider without free wheel operation The valves mainly consist of housing (), control spool () and three centering springs () at the control spool. The main flow from channel which can be variable to a certain degree is divided into two partial flows (volume flow partial function). The centering springs as well as the partial flows flowing to both outlets keep the control spool in medium position with their pressure. Caused by an imbalanced volume flow consumption of the pressurised actuators (e.g. hydraulic motor) a pressure difference occurs. This controls the control spool in such a way that the flow to both outlets remains within the partial accuracy. The division is largely independent from the pressure of the two individual flows and the viscosity. The return flow - pressure fluid flows from / to (summating function) - is summated with the flow divider valve. The actuator pressures can be taken directly at the measuring points (). With flow dividers with unequal division the larger partial flow is in channel as standard. When the valve is in operation as a flow divider cavitation may occur in one outlet due the driving around a corner (for example) or pressure peaks may occur in the system due to rapid changes in direction. For this reason pressure supply valves () are optionally integrated into the actuator ports. Through an orifice () between and volume balancing is possible where it is necessary. With integrated pressure supply valves port "" of the flow divider must be connected with the feed pump (port "G" of main pump). It is recommended to accurately check a circuit with a flow divider for danger of supply deficiency and pressure peaks. X X X-X Type MHFN.. additionally with integrated pressure supply valves /
RE 8/0.9 Function description, section Flow divider with free wheel option ( can be switched on) The function of this flow divider is in principle the same as the function of the flow divider without free wheel option. The valve is, however, additionally equipped with a control spool () and a return spring (8) for the return of the control spool. The control spool () is kept in the starting position by a return spring (8). The main flow from channel bypasses the control spool () and flows directly to ports and. The operation of the control spool () is carried out optionally hydraulic via port st (0) or with electrical operation via a directional valve (9) or a solenoid (). The control pressure in the cover (;) must not exceed 0 bar. When switching off the solenoid the control spool returns to the starting position. The control fluid in the cover () is pushed towards port () via the boring in the control spool (). For operating examples and symbols see pages and. st p st Y Y 0 8 Type MHFH... (hydraulic operated) 9 Type MHFE..., size 8 to (electro-hydraulic operated) Y-Y Type MHFE..., size (the differential lock is directly operated with a solenoid) /
Circuit examples for transmissions (Flow divider with integrated pressure supply valves) RE 8/0.9 8/08.9 MHF st MHF Flow divider as operated wheel separater(st) with integrated pressure supply valves "Model...H.." and supply port (). Flow divider as axis separater with integrated pressure supply valves "Model...H.." and supply port (). Note: If a flushing valve is necessary in a closed circuit with flow divider it must always be installed between pump and flow divider. If necessary please consult us. Ordering code MHF Model W/o free wheeling = N Flow divider hydraulic operated = H Flow divider electrically operated = E Mechanically operated on request ize q v = 0 /min = ize 8 q v = 0 /min = 8 ize q v = 0 /min = ize q v = 00 /min = Double-acting = D Division ratio ) : : : : = E 0 : 0 = : = C 8 : = F 0 : 0 = 0 : 0 = D : = G eries 0 to 9 = X (0 to 9: unchanged installation and connection dimensions) tandard = R D X V * Further details in clear text Type of connection 0 = = ) see table below = V = FM seals, suitable for Mineral oil (H, H) to DIN and hosphate-ester (HFD-R) Orifice in connection boring between and 00 = with locking screw 0 = Orifices-Ø 0, mm 08 = Orifices-Ø 0,8 mm 0 = Orifices-Ø,0 mm = Orifices-Ø, mm = Orifices-Ø, mm ) ize Direct voltage ) With uneven divisions the greater partial flow - unless stated otherwise - is always in channel (standard). : (actuator port) Example: Division ratio "" = 0 : 0 On request the larger partial flow may be in port "" (Example: division ratio ""= 0 : 0) ) only with electrical model "MHFE". ) Types of connection (further connection types on request) GZ = V GZ = V GC = 8 to V GC = 8 to V w/o code = w/o pressure supply valves in ports, H = with pressure supply valves in ports, (tandard-pressure setting to, 0 bar please indicate other pressure settings in clear text). ize Type of connection,,,, st 0 /" /" /" /8" 8 ) E /" E /" /" /" ) E /" E /" 9/-8 UNF /8- UNF ) E " E /" /" /" ) E " E " 9/-8 UNF /8- UNF ) E /" E " /" /" ) E /" E " 9/-8 UNF /8- UNF ) for E-flanges pressure stage 000 I (fixing screws metric thread) ) for E-flanges pressure stage 000 I (fixing screws UNC thread) orts,, and st to E J- ipe thread to IO 8/ /
RE 8/0.9 ymbols for flow divider without free wheel circuit Without pressure feed valves With pressure feed valves in ports, ymbols of flow divider with free wheel circuit, added operation Hydraulic operation Without pressure feed valves With pressure feed valves in ports, st st ize Without pressure feed valves Electrical operation With pressure feed valves in ports, ize ize 8 to ize 8 to st st /
Technical Data (For application outside these parameters please consult us!) RE 8/0.9 8/0.9 General Model Flow divider Type description MHF... Mounting type urface mounting Type of connection Threaded connection (size ); E-flange connection (size 8 to ) Installation position horizontal ize size 8 to Volume flow q v /min 0 00 Division accuracy % < ± Weight without / with pressure supply valves in and (ordering code "H") without with without with without free wheeling m kg,,0,0 Hydraulic operation m kg 8, 9,0,0, Electrical operation m kg 9,0 9,,0, Hydraulic Operating pressure ort,,,,, p bar up to 0 ort p bar unpressurized to tank ort st, p bar max.0 ressure difference p bar up to 0 Model size 8 to ilot pressure "E" p bar to max.0 witch pressure "H" p bar 8 to max. 0 to max.0 ressure fluid p bar Mineral oil (H, H) to DIN, phosphate ester (HFD-R) ressure fluid temperature range T C 0 to +80 Viscosity range ν mm /s 0 to 80 Fluid cleanliness Max. permissible degree of contamination to N 8 Class 9. We therefore recommend a filter with a minimum retention rate ß 0. Electrical (for electrically operated flow divider, ordering code "E") Voltage type U V and direct voltage (further voltages on request) ize size 8 to ower consumption with direct current W 0 Duty cycle ED % 00 00 mbient temperature T C up to 0 up to 0 Insulation to DIN 0 00 I I Replacement solenoid, type GH-- olenoid not available separately, complete valve see RE 8 00 /
RE 8/0.9 Operating Curves (measured at ν = mm /s and t = 0 C) Division accuracy in % Division accuracy T = Deviation of an actuator from theoretical operating curve with a pressure difference of 0 bar between and dependent on input volume flow q v, p. Minimum input flow q v, p max (tart of control) q v, p min = 0 without orifice between and essure difference p in bar 0 0 0 0 80 00 Input flow q v, p in % p-q v -operating curve with switched-on differential lock 8 0 8 ressure difference p in bar ressure difference p in bar 0 p-q v -orating curve with switched off differential lock,0,,0 0, 0 00 00 00 ize 0 0 00 0 00 0 00 Volume flow q v in /min 0 0 0 0 Orifice diagram 0 0 0 80 00 Input flow q v, p in % 0, ize 8,, 0,8,0,,,0,0 Orifice-Ø in mm Warning! The operating curves in the orifice diagram are purely calculated value and therefore for guidance purposes only. 0, 0. 0,0 0,0 0, 0, 0 0 00 00 Volume flow q v in /min /
Flow divider without free wheel operation RE 8/0.9 (Dimensions in mm) ize 0, orts = /" ; = /" ; = /" = /8" ipe thread "" to IO 8/ 0, W /F M = 00Nm 8 Ø 9 0 0 0 ±0, 0 0 90 0 9 8 Type description (Flow divider number) ressure feed valve (ordering code "H") Type MHDN K-X/0V Order no. 0 (further details see RE ) Key width of hexagonal nut /F, Tightening torque M = 90 ± 0 Nm ocking screw for compensating orifice ocking screw for measuring port Valve fixing holes Measure for type "without pressure feed valves" Measure for type with pressure feed valve (ordering codes "H") /
RE 8/0.9 Flow divider without free wheel operation (Dimensions in mm) ize 8,, 00, 0 9,,, 0,, 0 ; 8 0 8 0 8 0 9 9 Type description (Flow divider number) ressure feed valve (ordering code"h") Type MHDN K-X/0VFC Order no. 99 Key width of hexagonal nuts /F, Tightening torque M = 00 ± 0 Nm ocking screw for compensating orifice ocking screw for measuring port Valve fixing holes Measure for model "without pressure feed valves" Measure for model with pressure feed valves (ordering code "H") orts ize Type of connection,, 8 ) E /" E /" /" /" ) E /" E /" 9/-8 UNF /8- UNF ) E " E /" /" /" ) E " E " 9/-8 UNF /8- UNF ) E /" E " /" /" ) E /" E " 9/-8 UNF /8- UNF ) for E-flanges pressure rating 000 I (fixing screws metric thread) ) for E-flanges pressure rating 000 I (fixing screws UNC thread) orts and to E J- ipe thread to IO 8/ 8/
Flow divider for hydraulic operation RE 8/0.9 (Dimensions in mm) ize 0 st 9 0, orts = /" ; = /" ; ; = /" st = /" = /8" ipe thread "" to IO 8/ /F W M = 00Nm, 0, deep tief 0 8 9 8 0 08 0 8 0 8 0 9, Type description (Flow divider no.) ressure feed valve (ordering code"h") Type MHDN K-X/0V Order no. 0 (further details see RE ) Key width of hexagonal nuts /F, Tightening torque M = 90 ± 0 Nm ocking screw for compensating orifice ocking screw for measuring port Valve fixing holes Measure for model "without pressure feed valves" Measure for model "with pressure feed valves (ordering code "H") 8 Cover for control spool 9/
RE 8/0.9 Flow divider with hydraulic operation (Dimensions in mm) ize 8,, 8 08,, 8 89 0, deep tief st 0 0 0, 9 09 0 Type description (Flow divider no.) ressure feed valve (ordering code."h") Type MHDN K-X/0VFC Order no. 99 Key width of hexagonal nuts F/, Tightening torque M = 90 ± 0 Nm ocking screw for compensating orifice Valve fixing thread at port "" ; deep, at port "" /-UNC-/0," Dimensions for model "without pressure supply valves" Dimension for model with pressure supply valves (ordering code "H") 8 Cover for control spool ocking screw for measuring port orts ize Type of connection,,,, st 8 ) E /" E /" /" /" ) E /" E /" 9/-8 UNF /8- UNF ) E " E /" /" /" ) E " E " 9/-8 UNF /8- UNF ) E /" E " /" /" ) E /" E " 9/-8 UNF /8- UNF ) for E-flanges pressure rating 000 I (fixing screws metric thread) ) for E-flanges pressure rating 000 I (fixing screws UNC thread) ports and to E J- ipe thread to IO 8/ 0/
Flow divider for electrical operation RE 8/0.9 (Dimensions in mm) ize 9, 0 0 0, orts = /" ; = /" ; ; = /" = /8" ipe thread "" to IO 8/ 9 9 W /F M = 00Nm 0, deep tief, 0 8 0 9 8 8, 0 08 0 0, 0 9, Type description (Flow divider no.) ressure feed valve (ordering code."h") Type MHDN K-X/0V Order no. 0 (further details see RE ) Key width of hexagonal nuts /F, Tightening torque M = 90 ± 0 Nm ocking screw for compensating orifice ocking screw for measuring port Valve fixing holes Dimensions for model "without pressure feed valves" Dimension for model with pressure feed valves (Ordering codes "H") 9 Direct operation solenoid GH--- 0 lug "Z", grey pace requirement for removal of plug /
RE 8/0.9 8/0.9 Flow divider for electrical operation (Dimensions in mm) ize 8,, 0 9 9,, 8 89 0 08 st, 0, deep tief 0 0 0,, 9 0 09 Type description (flow divider no.) ressure feed valve (Ordering codes "H") Type MHDN K-X/0VFC Order no. 99 Key width of hexagonal nuts /F, Tightening torque M = 90 ± 0 Nm ocking screw for compensating orifice orts ocking screw for measuring port Valve fixing thread at port "" ; deep, at port "" /-UNC-/0," Dimension for model "without" pressure feed valves Dimension for model with pressure feed valves (ordering code "H") 9 Directional valve with wet pin DC solenoid (see RE 8 00) 0 lug, -pin Junior Timer type C and contacts (M) pace requirement for removal of plug ize Type of connection,,,, st 8 ) E /" E /" /" /" ) E /" E /" 9/-8 UNF /8- UNF ) E " E /" /" /" ) E " E " 9/-8 UNF /8- UNF ) E /" E " /" /" ) E /" E " 9/-8 UNF /8- UNF ) for E-flanges pressure rating 000 I (fixing screws metric thread) ) for E-flanges pressure rating 000 I (fixing screws UNC thread) ports and to E J- ipe thread to IO 8/ Mannesmann Rexroth G Rexroth Hydraulics D-98 ohr am Main Jahnstraße - D-98 ohr am Main Telefon 0 9 / 8-0 Telefax 0 9 / 8-0 0 Mannesmann Rexroth imited Cromwell Road, t. Neots, Huntingdon, Cambs. E9 E Tel: (080) 0 Fax: (080) 90 / The specified data is for product description purposes only and may not be deemed to be guaranteed unless expressly confirmed in the contract. ll rights reserved ubject to revision