XCEL 45 Steering Control Units

Transcription

1 XCEL 45 Steering Control Units Bolt-on riority Valves In-line riority Valves Flow up to 45 lpm Displacement cc

2 Table of Contents XCEL 45 Overview XCEL 45 Specification Data Hydraulic Circuit Explanation Neutral Circuits: Open Center Neutral Circuits: Load Sensing Work Circuits: Non-Load Reaction and Load Reaction Steering Units with Integral Valves Special Features, Manual Steering Q-Amp Flow Amplification for Load Sensing Circuits Description Advantages Features XCEL 45 Steering Unit Dimensions Dual Displacement Description and Features Installation Drawing Eaton atented Technologies STC Direct orting Model Code Customer Order Information Bolt on VLC riority Valve (BOV) Overview Dimensions Customer Order Information VLC In-Line riority Valves Dimensions Specification Hydraulic Symbol ressure Drop Curve VLE In-Line riority Valves Dimensions Specification Hydraulic Symbol ressure Drop Curve Customer Order Information Ordering Information System ressure Code Number VLC In-Line riority Valves VLE In-Line riority Valves EATON XCEL 45 Steering Control Units C-STCU-MC002-E March 2009

3 XCEL 45 Steering Unit Steering Control Units The Eaton XCEL 45 steering control unit (SCU) is fully fluid linked. This means there is no mechanical connection between the steering unit, the pump and the steering cylinders. The unit consists of a manually operated directional control servo valve and feedback meter element in a single body. It is used principally for fluid linked power steering systems but it can be used for some servotype applications or any application where visual positioning is required. The close coupled, rotary action valve performs all necessary fluid directing functions with a small number of moving parts. The manually actuated valve is coupled with the mechanical drive to the meter gear. The control is lubricated and protected by the power fluid in the system and can operate in many environments. XCEL 45 The XCEL 45 steering unit is an innovative steering platform that provides smooth and reliable steering. The XCEL 45 is designed for mid-range flow applications. The XCEL 45 is offered in several combinations including a variety of integral valve options, port sizes and multiple displacements. Features Open Center or Load Sensing Neutral Circuit Robust housing design provides 190 bar max [2755 psi] system pressure capability for all models Six Integral Valves enable multiple configuration options: - Check Valves for Limited Manual Steering - Inlet Relief Valve - Inlet Check Valve - Cylinder Relief Valve - Load Sensing Relief Valve - Anti-cavitation Valve Innovative valving design provides optimized gain characteristics and reduced hydraulic noise level Specification Data ressure : bar [psi] Max. System ressure 190 [2755] Max. Back ressure 21 [305] Rated Flow: lpm [gpm] Input Torque: cc/r [2-4] cc/r [4-8] cc/r [8-12] Nm owered Standard owered Low Torque Non-powered 136 Max. Temperature: C [F] Fluid: Max. System 93 [200 ] Operating Temperature Max. Differential Between 28 [50 ] Steering Unit and Other System Temperature ATF Type A and Most etroleum Based Fluids See Eaton Technical Bulletin Recommended Filtration: ISO 18/13 cleanliness level EATON XCEL 45 Steering Control Units C-STCU-MC002-E March

4 Hydraulic Circuit Explanation Neutral Circuits: Open Center Open Center Simplest, most economical system Uses a fixed displacement pump In neutral position pump and tank are connected Most suitable on smaller type vehicles Applications Lawn and Garden Equipment Utility Vehicles L Gerotor R T Fixed Displacement ump 4 EATON XCEL 45 Steering Control Units C-STCU-MC002-E March 2009

5 Hydraulic Circuit Explanation Steering Cylinder Neutral Circuits: Load Sensing Manual Input LS L R T Load Sensing Steering Unit CF High ressure Carryover T LS DS EF Main Relief riority Valve Dynamic Signal Filter ump rime Mover LS DS CF EF Load Sensing Dynamic Signal ilot ressure Control Flow Excess Flow Load Sensing Circuits XCEL 45 load sensing power steering uses conventional or load sensing power supplies to achieve load sensing steering. The use of a load sensing steering unit and a priority valve in a normal power steering circuit offers the following advantages: rovides smooth pressure compensated steering because load variations in the steering circuit do not affect axle response or maximum steering rate. rovides true power beyond system capability by splitting the system into two independent circuits. ressure transients are isolated in each circuit. Only the flow required by the steering maneuver goes to the steering circuit. Flow not required for steering is available for use in the auxiliary circuits. rovides reliable operation because the steering circuit always has flow and pressure priority. XCEL 45 load sensing steering control units and priority valves can be used with open center, closed center or load sensing systems. Use in an open center system with a fixed displacement pump or a closed center system with a pressure compensated pump, offers many of the features of a load sensing system. Excess flow is available for auxiliary circuits. Listed below are the components of a typical load sensing control circuit and a brief application description. ump May be fixed displacement, pressure compensated, or flow and pressure compensated design. riority Valve Sized for design pressure drop at maximum pump output flow rate and priority flow requirements. The minimum control pressure must assure adequate steering flow rate and must be matched with the steering control unit. A dynamic signal priority valve must be used with a dynamic signal steering control unit. Steering Control Unit Designed for specific rated flows and control pressures. It must be matched with a control pressure in the priority valve to obtain maximum steering rates. Higher flow rates require higher control pressures. Neutral internal bleed assures component temperature equalization. LS Line A LS line is always needed to sense pressure downstream from the variable control orifice in the steering control unit. This is balanced by an internal passage to the opposite side of the priority control spool. The total system performance depends on careful consideration of the control pressure chosen and pressure drop in the CF line. Steering Relief Valve Must be factory set at least 10 bar [145 Sl] above the maximum steering cylinder pressure requirement. Most of the flow will be directed to the auxiliary circuit (EF) when the relief setting is exceeded. System Main Relief Valve A pressure relief valve for the auxiliary circuit and/or a main safety valve for the protection of the pump is recommended and sized for the maximum pump output flow rate. If a main relief valve is used, it must be set above the priority circuit steering relief valve pressure setting. EATON XCEL 45 Steering Control Units C-STCU-MC002-E March

6 Hydraulic Circuit Explanation Neutral Circuits: Load Sensing Load Sensing Circuits: Signal Systems Two types of load sensing signal systems are available Dynamic and Static. Dynamic Signal Used for more difficult applications. The dynamic signal systems offer the following benefits: Faster steering response. Improved cold weather start-up performance. Increased flexibility to solve problems related to system performance and stability. Dynamic Signal Open Center ump Dynamic Signal T L R T LS LS CF EF Load Sensing (Dynamic Signal) Steering Control Unit (non-load reaction) High ressure Carryover to Auxiliary Circuit with Open Center Valve(s) riority Valve (Dynamic Signal) Fixed Displacement ump Load Sensing Steering System with Fixed Displacement ump (Open Center Circuit) Dynamic Signal Load Sensing ump Dynamic Signal L R T T LS LS CF Shuttle Valve EF Load Sensing (Dynamic Signal) Steering Control Unit (non-load reaction) Auxiliary Circuit with Load Sensing Valve(s) riority Valve (Dynamic Signal) ilot Signal from Auxiliary Circuit ressure and Flow Compensated ump Load Sensing Steering System with ressure and Flow Compensated ump (Closed Center, Load Sensing Circuit) 6 EATON XCEL 45 Steering Control Units C-STCU-MC002-E March 2009

7 Hydraulic Circuit Explanation Neutral Circuits: Load Sensing Static Signal Open Center ump Static Signal Used for conventional applications where response or circuit stability is not a problem. The load sensing pilot line should not exceed 2 meters [6 feet] in length. Static Signal T L R T LS LS CF EF Load Sensing (Static Signal) Steering Control Unit (non-load reaction) Auxiliary Circuit with Open Center Valve(s) riority Valve (Static Signal) Fixed Displacement ump Load Sensing Steering System with Fixed Displacement ump (Open Center Circuit) EATON XCEL 45 Steering Control Units C-STCU-MC002-E March

8 Hydraulic Circuit Explanation Work Circuits: Non-Load Reaction and Load Reaction Non-Load Reaction A non-load reaction steering unit blocks the cylinder ports in neutral, holding the axle position whenever the operator releases the steering wheel. L Gerotor Metering Mechanism R Direct Mechanical Link T Steering Control Unit ressure and Flow Compensated ump Closed Center System Non-Load Reaction Circuit Load Reaction A load reaction steering unit couples the cylinder ports internally (in the neutral position) with the meter gear set. Axle forces are then allowed to return the steering wheel to its approximate original position. Comparable to automobile steering, gradually releasing the wheel mid turn will allow the steering wheel to spin back as the vehicle straightens. The cylinder system used with load reaction units must have equal oil volume displaced in both directions. The cylinders should be a parallel pair (as shown) or one double rod end unit. Do not use with a single unequal area cylinder system. L Gerotor Metering Mechanism T R Steering Control Fixed Unit Displacement ump Direct Mechanical Link Open Center System Load Reaction Circuit 8 EATON XCEL 45 Steering Control Units C-STCU-MC002-E March 2009

9 Steering Units with Integral Valves Integral valves are available for the XCEL 45 steering control unit. Included are: Inlet Relief Valve, Cylinder ort Shock Valves, LS-Relief Valve, and Anti-Cavitation Valves for cylinder ports. In addition, a Manual Steering Check Valve for limited manual steering is included. The integral valves eliminate the need for a separate valve block, and provides versatility to meet any steering circuit standard. Valve Description: 1 Anti-cavitation check valve for cylinder ports (R & L) protects steering circuit against vacuum (cavitation) conditions. 2 Cylinder ort Relief Valves (R & L) protects hoses against pressure surge created by ground forces on the steered axle. 3 Manual Steering Check Valve converts unit to a hand operated pump for limited manual steering. Included in all units except Series 20, 25, and 40.** 4 Inlet Relief Valve limits maximum pressure drop across the steering unit protecting the steering circuit. 5 Inlet Check Valve prevents oil from returning through the steering unit when pressure on the cylinder side is greater than pressure on the inlet side to prevent steering wheel kick. 6 LS-Relief Valve Limits maximum pressure in the steering circuit (LS units only) **Steering units with displacements larger than 185 cm3/r [11.3 in3/r] may require a separate power source for limited operation EF 6 EATON XCEL 45 Steering Control Units C-STCU-MC002-E March

10 Special Features and Application Manual Steering Description The steering control unit can provide steering flow when the pump or engine fails. It will pump oil through the meter (gerotor) as the operator applies input or torque to the steering wheel which provides limited manual steering. Use of Graph 1. Determine steering work port pressure required to preform the desired steering maneuver from vehicle test data. This defines the approximate manual steering pressure level required. Find this value on the vertical axis and construct a horizontal line on the graph. 2. Find the input torque limit on the horizontal axis. Follow this vertically until it crosses the required pressure line of step The maximum steering unit displacement is identified by the first angled line to the left of this intersection. [1000] [ 800] [ 600] [SI] [ 400] [ 200] RM RM 40 [2.4] 1-3 RM [3.85] [4.88] 100 [6.1] Displacement cm 3 /r [in 3 /r] 125 [7.6] 160 [9.8] 200 [12.2] 250 [15.2] 320 [19.5] 400 [24.4] bar [20] 54 [40] 81 [60] 108 [80] 136 [100] 0 Manual Input Torque Nm [lb-ft] 1) Maximum flow less than 7,6 l/min [2 GM]. 2) Actual steering pressures required and manual steering capabilities must be verified with vehicle testing. The above curves are intended as a design guide only. 10 EATON XCEL 45 Steering Control Units C-STCU-MC002-E March 2009

11 Q-Amp Flow Amplification for Load Sensing Circuits Description and Advantage Q-Amp steering units have built in variable orifices that provide flow directly to the cylinder without going through the gerotor section. The orifices do not open until after the gerotor begins to rotate and then gradually open until the desired flow is achieved which is proportional to the flow going through the gerotor. A typical Q-Amp unit has a ratio of 1.6:1 which means the flow of the cylinder is 1.6 times the flow going through the gerotor when turning the steering wheel at medium to fast speeds. (See model code for available ratios.) Conventional Steering Control Unit Fast Turn ump Rotary Valve Q-Amp Steering Control Unit Fast Turn Meter Cylinder Fast Turn Rotary Valve Meter Features Variable Ratio 2:1 ump Cylinder Ratio Turns Lock to Lock 1.6:1 1: RM Q-Amp Steering Control Unit Slow Turn Slow Turn ump Rotary Valve No Flow Meter Cylinder RM Manual Steering Steering a vehicle with loss of engine power may not be possible with a large displacement steering control unit (SCU). Q-Amp with manual feature has the smaller additional flow requirement of the larger displacement SCU for power steering. Single Cylinder (Unequal area ) On vehicles with one single unequal area cylinder the steering wheel turns lock to lock are more in one direction than the other. When extending the rod one would get more turns than when retracting it. A different Q-Amp ratio while turning in one direction versus the other can be used to give an equal number of turns lock to lock in each direction. EATON XCEL 45 Steering Control Units C-STCU-MC002-E March

12 XCEL 45 Steering Unit Dimensions D Left Load Sensing ort Right Column Mounting Thread Depth 15.5 on 82.5 Dia. Bolt Circle(4) Option A Load Sensing port Option B Ø Ø Ø Mating 6 max 8 max Tank ressure M12X Deep(2) Not available for LS units with Option B LS ort 12 Tooth Involute Spline 16/32 D.. 30.A Deep 82 Load Sensing ort Options: Option A Only used for LS units with LS relief valve in priority valve Option B Only used for LS units with LS relief valve in steering unit Load Sensing Flange ort Thread Thread M20X1.5 M12x1.5 M10x1.5 M20x1.5 O-ring M12x1.5 M10x1.5 G-1/2 BS M12x1.5 M10x1.5 3/4 16 O-ring 7/16 20 O-ring M10x1.5 9/16 18 O-ring 7/16 20 O-ring M10x1.5 3/4 16 O-ring 7/16 20 O-ring 3/8 16 9/16 18 O-ring 7/16 20 O-ring 3/8 16 G-1/4 O-ring G-1/4 O-ring M10x1.25 Displacement cc/r mm Dimension B 12 EATON XCEL 45 Steering Control Units C-STCU-MC002-E March 2009

13 Dual Displacement Description and Features The dual displacement steering control unit allows off road vehicles to retain manual steering capability while reducing the number of components in their system. By using two displacements in one unit the dual displacement offers a better solution to manually steer a vehicle in an unpowered mode without the need of a back-up power system. This simplifies the design and provides a more economical machine. The dual displacement steering units use two gerotors and a pressure controlled logic valve. The logic valve switches between one displacement for manual steering and the total of both displacements for powered operation. The logic valve is spring returned to the smaller manual displacement when inlet pressure falls bellow 8 bar [120 psi]. Above 8 bar [120 psi] the logic valve connects both gerotors to provide full powered displacement. LS Circuit L Added Gerotor Logic Valve Manual Gerotor R Manual steering capabilities in unpowered mode Eliminates the need for a back-up emergency system Engages the small displacement in an unpowered mode and allows manual steering Allows vehicles to meet ISO/TUV road regulations erformance in powered mode Both gerotors are engaged to steer the vehicle Same performance as other Eaton steering units Additional Features Steering circuit available Load Sensing Open Center Max. system pressure: 190 bar [2755 psi] Valve options and other features: same as those available on other units Innovative low noise design Displacement Chart Gerotor 1 Gerotor 1 and 2 Gerotor 1 Gerotor 1 and 2 Manual displ. owered displ. Manual displ. owered displ. in 3 /rev in 3 /rev cm 3 /rev cm 3 /rev For any other displacement please see your Eaton Representative Manual 63 cm 3 /r [3.85 in 3 /r] owered 223 cm 3 /r [13.6 in 3 /r] owe r ed Mod e Manual Mode Input Speed RM Flow vs RM (for each operating mode) Steering Flow l/min T LS EATON XCEL 45 Steering Control Units C-STCU-MC002-E March

14 Dual Displacement Installation Drawing ort and Mounting Thread Combinations Column Mounting Load Sensing* ort Mounting ort Thread ort Thread 3/4-16 O-ring M10x1.5-6H 7/16-20 O-ring M12x1.75-6H M18X1.5-6H (BS) M10x1.5-6H M12x1.5 (BS) M12x1.75-6H G1/2 (BS) M10x1.5-6H G1/4 (BS) M12x1.75-6H *Load Sensing Units only Left A Load Sensing ort Right C D Column Mounting Thread Depth 15.5 on 82.5 Dia. Bolt Circle (4) Load Sensing ort 14 82,8 Ø44, Ø25,4 Ø Mating 6 max 8 max Tank ressure M12x Deep (2) Not available for LS units with option B LS ort B 12 Tooth Involute Spline 16/32 D.. 30.A Deep ,4 82,5 31,2 owered Gerotor 1 and 2 Displacement Dimension A Dimension B cm 3 /r mm mm Manual Gerotor 1 Gerotor 2 Displacement Dimension C Displacement Dimension D cm 3 /r mm cm 3 /r mm EATON XCEL 45 Steering Control Units C-STCU-MC002-E March 2009

15 Eaton atented Technologies STC Direct orting With the Snap-To-Connect (STC) Direct orting option, the fitting profile is machined into the SCU housing, eliminating the need for extra STC fittings. This revolutionary and patented porting technology provides leak-proof sealing and has operating pressure capability exceeding 4500 SI (310 bar). STC Direct orting is available with XCEL 45 Steering Control Units. Benefits STC Direct orts provide a great opportunity for significant cost savings compared to threaded fittings Eliminates the need for assembly tools during installation Eliminates installation variability Improves ergonomics - reduces installer effort to connect Improves serviceability High quality, leak-proof seal Eliminates connector leakage Compact design and overall lighter weight EATON XCEL 45 Steering Control Units C-STCU-MC002-E March

16 Model Code Customer Order Information The following 29-digit coding system has been developed to identify all of the configuration options for the XCEL 45 steering control units. Use this model code to specify a unit with the desired features. All 29-digit of the code must be present when ordering. You may want to be photocopy the matrix below to ensure that each number is entered in the correct box. This model code shows referred roducts only. For a complete model code listing all available options, please contact your Eaton representative. S X * * * A * * * * * * * * * * * * * * * A 3 * A A 1 0 A , roduct Series SX Series XCEL 45 Steering Control Unit 3 Unit Type A Standard B Dual Displacement 4 Nominal Flow Rating l/min (3 GM) l/min (6 GM) 3 45 l/min (12 GM) 4 37 l/min (10 GM Q-amp) 5 75 l/min (20 GM Q-amp) 5 Inlet ressure Rating bar (2755 SI) 6 Return ressure Rating A 21 bar (300 psi) MAX. (standard rating*) 7, 8 Displacement cm3 /r Dual Displacement Combined Manual / / /60 Displacement cm 3 /r (in 3 /r) (2.4) (3.1) (3.85) 11.3 l/min (4.88) (6.1) (7.6) (9.8) (12.2) 22.7 l/min (15.2) (19.5) (24.4) 45 l/min (30.5) 9 Flow Amplification* A None (No Q-Amp) B 1.6:1.0 Ratio C 2.0:1.0 Ratio 10 Neutral Circuit A Open Center B Load Sensing, Static Signal C Load Sensing, Dynamic Signal 11 Load Circuit A Non-load Reaction B Load Reaction 12 13, Valve Option MSC = Manual Steering Check ICV = Inlet Check Valve CRV = Cylinder Relief Valve ACV = Anti-Cavitation IRV = Inlet Relief Valve 01 MSC 02 MSC, ICV 03 MSC, IRV 04 MSC, ICV, IRV 05 MSC, ICV, CRV, ACV 06 MSC, CRV, ACV 07 MSC, ICV, CRV, ACV, IRV 08 MSC, CRV, ACV, IRV 09 MSC, ICV, ACV, IRV 14 15, Inlet Relief Valve bar (psi) 00 None (940 psi) (1230 psi) (1670 psi) (870 psi) (915 psi) (1015 psi) (1160 psi) (1305 psi) (1377 psi) (1450 psi) (1522 psi) (1595 psi) (1696 psi) (1812 psi) (1885 psi) (2030 psi) (2175 psi) (2392 psi) (2537 psi) (2755 psi) 16 17, Cylinder Relief Valve bar (psi) 00 None (1670 psi) (1450 psi) (1522 psi) (1595 psi) (1740 psi) (1812 psi) (2030 psi) (2175 psi) (2320 psi) (2537 psi) (2682 psi) (2755 psi) (2900 psi) (3045 psi) (3190 psi) (3407 psi) (3480 psi) (3625 psi) 18, 19, 20 21, ort and Mounting AAAA 4-M18X1.5-6H Metric orts None (No Additional port) Mounting Threads AABA 4-M18X1.5-6H Metric orts M12X1.5 Load Sensing ort ABAA 4-M18X1.5-6H Metric O-ring orts None (No Additional ort) ABBA 4-M18X1.5H Metric O-ring orts M12X1.5 O-ring Load Sensing ort BAAA 4-M20X1.5-6H Metric orts None (No Additional ort) BABA 4-M20X1.5-6H Metric orts M12X1.5 Load Sensing ort BBAA 4-M20X1.5-6H Metric O-ring orts None (No Additional ort) 16 EATON XCEL 45 Steering Control Units C-STCU-MC002-E March 2009

17 Model Code Customer Order Information Continued The following 29-digit coding system has been developed to identify all of the configuration options for the series XCEL 45 steering control units. Use this model code to specify a unit with the desired features. All 29-digit of the code must be present when ordering. You may want to be photocopy the matrix below to ensure that each number is entered in the correct box. S X * * * A * * * * * * * * * * * * * * * A 3 * A A 1 0 A BBBA 4-M20X1.5-6H Metric O-ring orts M12X1.5 O-ring Load Sensing ort CAAA 4-G1/2(BS) Straight Thread ports None (No Additional ort) CABA 4-G1/2(BS) Straight Thread ports M12X1.5 Load Sensing ort CADA 4-G1/2(BS) Straight Thread ports G1/4-19 Straight Thread Load Sensing ort DAAA 4-G1/4-19 Straight Thread ports None (No Additional ort) DADA 4-G1/4-19 O-ring orts G1/4-19 StaightThread Load Sensing ort * All low torque units need approval from an Eaton Steering Engineering DBAC 4-G1/4-19 O-ring orts None (No Additional ort) 4-M10X1.25 DBDC 4-G1/4-19 O-ring orts G1/4-19 O-ring Load Sensing ort 4-M10X1.25 EBAC 4-G3/8-19 O-ring orts None (No Additional ort) 4-M10X1.25 EBEC 4-G3/8-19 O-ring orts G3/8-19 O-ring Load Sensing ort 4-M10X1.25 FBAA 4-9/16-18 O-ring orts None (No Additional ort) FBAB 4-9/16-18 O-ring orts None (No Additional ort) 4-3/8-16 FBCA 4-9/16-18 O-ring orts 7/16-20 O-ring Load Sensing ort FBCB 4-9/16-18 O-ring orts 7/16-20 O-ring Load Sensing ort 4-3/8-16 GBAA 4-3/4-16 O-ring orts None (No Additional ort) GBAB 4-3/4-16 O-ring orts None (No Additional ort) 4-3/8-16 GBCA 4-3/4-16 O-ring orts 7/16-20 O-ring Load Sensing ort Mounting Threads GBCB 4-3/4-16 O-ring orts 7/16-20 O-ring Load Sensing ort 4-3/8-16 Mounting Threads 22 Mechanical Interface A Internal Involute Spline, 12 tooth 16/32 D30 A 23 Input Torque 1 Low* 3 Standard 24 Fluid Type A See Eaton Technical Bulletin ort Face A 2-M12X Special Features A None B Low Noise Design (Open Center) 27 aints and ackaging 1 Black 28 Identification 0 Eaton roduct Number on Nameplate 29 Eaton Assigned A Assigned Design Code NOTE: A dynamic signal steering unit must be used together with a dynamic signal priority valve. Select number from this table and take reference of the connection dimensions. lease always show your selected product number when you place an order. EATON XCEL 45 Steering Control Units C-STCU-MC002-E March

18 Bolt on VLC riority Valve (BOV) Load sensing power steering uses conventional or load sensing power supplies to achieve load sensing steering. The use of a load sensing steering unit and a priority valve in a normal power steering circuit offers the following advantages: rovides true power beyond system capability by splitting the system into two independent circuits. ressure transients are isolated in each circuit. Only the flow required by the steering maneuver goes to the steering circuit. Flow not required for steering is available for use in the auxiliary circuits. rovides reliable operation because the steering circuit always has flow and pressure priority. The bolt on VLC priority valve is designed to be directly mounted onto the port face of a load sensing steering control unit. In line VLC and VLE priority valves are also available for integrated circuit applications. The load sensing steering control units and priority valves can be used with open center, closed center or load sensing systems. Use in an open center system with a fixed displacement pump or a closed center system with a pressure compensated pump, offers many of the features of a load sensing system. Excess flow is available for auxiliary. Illustration of BOV installed on Xcel 45 Symbol Dynamic Signal LS CF EF 18 EATON XCEL 45 Steering Control Units C-STCU-MC002-E March 2009

19 Bolt on VLC riority Valve (BOV) Dimensions Excess Flow ort Right ort Left ort 10 8 ressure ort 38 Tank ort T EF R L Right ort Left ort Customer Order Information VLC riority Valve (BOV) The VLC priority valve (BOV type) is ordered by a product serial number roduct Number (Max. inlet flow capacity 60LM) roduct Numbers Control ressure Bar ort & Threads Circuit & EF G1/2 Dynamic Signal R & L & T G3/8 & EF M20X1.5 Dynamic Signal R & L & T M18X1.5 & EF G1/2 Dynamic Signal R & L & T G1/2 EATON XCEL 45 Steering Control Units C-STCU-MC002-E March

20 VLC In-Line riority Valves Dimensions Tank Inlet ressure Load Sensing Controlled Flow Excess Flow Specifications Rated Input Flow: L/min 60 Rated Inlet ressure: bar 241 Max. LS Relief Setting: bar 172 Hydraulic Symbols Static Signal LS CF EF A static signal priority valve must be used with a static signal load sensing steering unit A dynamic signal priority valve must be used with a dynamic signal load sensing steering unit Dynamic Signal LS CF EF VLC Series ressure Drop Curve bar Minimum ressure Drop - EF Oil Viscosity 25 cst [120 SUS] [SI] [120] [100] [80] [60] [40] [20] 18, l/min [5] [10] [15] [20] [gpm] Maximum pressure drop depends on control pressure setting and pressure out EF port. 20 EATON XCEL 45 Steering Control Units C-STCU-MC002-E March 2009

21 VLE In-Line riority Valves Dimensions Tank Inlet ressure Load Sensing Controlled Flow Excess Flow Specifications Rated Input Flow: L/min 150 Rated Inlet ressure: bar 241 Max. LS Relief Setting: bar 172 Hydraulic Symbols Static Signal LS CF EF A static signal priority valve must be used with a static signal load sensing steering unit A dynamic signal priority valve must be used with a dynamic signal load sensing steering unit Dynamic Signal LS CF EF VLE Series bar ressure Drop Curve [SI] [140] [120] [100] [80] [60] [40] [20] Maximum pressure drop depends on control pressure setting and pressure out EF port , l/min [10] [20] [30] [40] [50] [gpm] Minimum ressure Drop - EF Oil Viscosity 25 cst [120 SUS] EATON XCEL 45 Steering Control Units C-STCU-MC002-E March

22 Customer Order Information VLC or VLE In-Line riority Valves Ordering Information System ressure Code Number roduct Number For VLC In-Line riority Valves System ressure Code Number roduct Number For VLE In-Line riority Valves System ressure Code Number Number Bar [psi] Number Bar [psi] Number Bar [psi] NOTE: If there is not a relief valve, the system pressure code number is 000. Select a pressure code from this table and include it in the product number you determined. lease always show your selected product number when you place an order. 22 EATON XCEL 45 Steering Control Units C-STCU-MC002-E March 2009

23 Customer Order Information VLC or VLE In-Line riority Valves NOTE: A dynamic signal steering unit must be used together with a dynamic signal priority valve. Select a number from this table and take reference of the connection dimensions on page 17. lease always show your selected product number when you place an order. VLC In-Line riority Valves ort Size Signal Type & Control ressure Bar [SI] Static Dynamic Static Dynamic Static Dynamic 3.5 [50] 5.2 [75] 5.2 [75] 76 [110] 6.0 [100] 10.0 [145] & EF: 3/4-16 O-ring CF: 9/16-18 O-ring LS & T: 7/16-20 O-ring & EF: 7/8-14 O-ring CF: 3/4-16 O-ring LS & T: 7/16-20 O-ring & EF: M22X1.5 O-ring CF: M18X1.5 O-ring LS & T: M12X1.5 O-ring & EF: G1/2-14 CF: G1/ LS & T: G1/4-19 VLE In-Line riority Valves ort Size Signal Type & Control ressure Bar [SI] Static Dynamic Static Dynamic Static Dynamic 4.5 [65] 5.5 [80] 6.9 [100] 8.6 [125] 10.3 [150] 12.8 [185] & EF: 1-5/16-12 O-ring CF: 7/8-14 O-ring LS & T: 7/16-20 O-ring & EF: 1-1/16-12 O-ring CF: 7/8-14 O-ring LS & T: 7/16-20 O-ring & EF: 7/8-14 O-ring CF: 3/4-16 O-ring LS & T: 7/16-20 O-ring & EF: 1-1/16-12 O-ring CF: 3/4-16 O-ring LS & T: 7/16-20 O-ring & EF: 1-5/16-12 O-ring CF: 1-5/16-12 O-ring LS & T: 7/16-20 O-ring & EF: 1-5/16-12 O-ring CF: 3/4-16 O-ring LS & T: 7/16-20 O-ring & EF: M27X2 O-ring CF: M18X1.5 O-ring LS & T: M12X1.5 O-ring & EF: G3/4-14 CF: G1/ LS & T: G1/4-19 EATON XCEL 45 Steering Control Units C-STCU-MC002-E March

24 Eaton Hydraulics Group USA Lone Oak Road Eden rairie, MN USA Tel: Fax: Eaton Hydraulics Group Europe Route de la Longeraie Morges Switzerland Tel: +41 (0) Fax: +41 (0) Eaton Hydraulics Group Asia acific 11th Floor Hong Kong New World Tower 300 Huaihai Zhong Road Shanghai China Tel: Fax: Eaton Corporation All Rights Reserved rinted in USA Document No. C-STCU-MC002-E March 2009