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ElectrohydraulicComponentsdesigned for use in electrohydraulic braking

and/or electronic throttle control applications

Electronic Pedals, Digital Valve Controllers,

and Electrohydraulic Valves

Electronic Pedals, Digital Valve Controllers,

and Electrohydraulic Valves

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Electrohydraulics

What are Electrohydraulic Brake Systems?

Electrohydraulic brake systems are the combination ofelectronics and hydraulics to create a more versatilebrake system. The electronics provide control flexibility,while the hydraulics supply the power.

Electrohydraulic braking offers many advantages overtraditional hydraulic braking systems. These advan-tages can be exploited to provide improved systemperformance and greater comfort for the operator.Valves can be moved away from the cab and closer tothe brakes, reducing plumbing costs. Remote opera-tions are easily handled without having to duplicate thevalving. Vehicle controls can be improved by imple-menting a variety of control schemes such as electro-hydraulic brake systems, anti-lock brake systems(ABS), and traction control systems (TCS). Thesesystems are a result of hydraulics and electronicscombining to create brake systems that provide valueadded features for the machine operator.

About this CatalogPages 3 through 6 provide functional diagrams of avariety of electrohydraulic brake systems. Thesefunctional diagrams are not detailed representations ofactual systems, but are meant to provide an overview ofvarious brake system configurations that might beconsidered using electrohydraulic technology.

Pages 7 through 11 provide information on MICOcomponents that can be used in the design of anelectrohydraulic brake system. Please consult MICOengineering about your application. Components thatmight be better suited to your application may not be

presented in this catalog.

What does MICO have to offer?

The products shown in this catalog are designed for usein electrohydraulic braking and/or electronic throttlecontrol applications. MICO offers a complete electro-hydraulic package, which includes a variety of electronicpedal configurations and sensing options, digital valvedrivers, and a variety of electrohydraulic brake valves(EBV).

Typical applications for these new products would bedrive-by-wire, electrohydraulic braking, machines withmultiple operator stations, remote control operation, or

propel and inching pedals for hydrostatic drive systems.In throttle applications, the pedal can be configured tointerface directly to the engine's electronic control unit.

MICO electronic pedals provide force feedback,proportional to pedal rotation, with rotary sensors toprovide one or more analog outputs that areproportional to pedal rotation. Both treadle andsuspended pedal models are available.

The MICO Digital Valve Driver is designed to acceptdual inputs from an electronic pedal and convert thesignal into current needed to drive the MICO Electro-hydraulic Brake Valves.

MICO

Electrohydraulic Brake Valves are full powerbrake valves used for modulating output pressures, upto 207 bar (3000 PSI), in proportion to the input current.When used in properly designed systems, these valvescan provide hydraulic power for normal and emergencypower-off braking for electrohydraulic brake systems,anti-lock braking systems, and traction control systems.

In addition to these components, MICO can provide fullpower brake systems with ABS, traction control, or both,for vehicles that require up to eight channels of control.

Table of ContentsElectrohydraulics

What are ElectrohydraulicBrake Systems ..........................................Page 2

About this Catalog ...................................... Page 2What does MICO have to offer ....................Page 2

Electrohydraulic Brake SystemsElectrohydraulic Brake System....................Page 3Electronically Enhanced

Full Power Brake System..........................Page 3Full Power Brake System with ABS.............Page 4Full Power Brake System

with Traction Control .................................Page 4Electrohydraulic Brake System with ABS

and Traction Control..................................Page 5Electrohydraulic Brake System

with Inching Control...................................Page 5Hydraulic Brake System with

ABS and Traction Control .........................Page 6Electrohydraulic Brake System

for Trailers .................................................Page 6

T-Series Valve Driver ...................................Page 7

Electronic Pedals with

Brake Valve Interface ........................Pages 8 & 9

EBV Series Electrohydraulic

Brake Valve ...................................Pages 10 & 11

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ACCUMULATOR 2

ACCUMULATOR 1

MICOELECTROHYDRAULIC

BRAKEVALVE

MICOVALVE DRIVERWITH REDUNDANT

INPUT


BRAKEVALVE

MICOELECTRONICPEDAL

BRAKEWARNING

MICOPRESSURSWITCH

MICOVALVE DRIVERWITH REDUNDANT

INPUT

+V

MICO DUALACCUMULATOR

CHARGING VALVE

Electrohydraulic Brake Systems

Electrohydraulic Brake System (See Figure 1)

These systems provide flexible control while complyingwith requirements of primary and secondary brakingstandards. Dual pedal angle sensors send signals toredundant input valve drivers that control the brakevalves. Features of this type of system include:

Ability for designers to remove the brake valve andthe hydraulic hoses from the operator station

Provides primary and secondary braking to meetindustry standards

Pedal force feedback is proportional to pedal angle

Programmable pressure vs. pedal angle functions

Easy to add additional remote operator stations

Automated braking can be programmed to occurbased on inputs from other sensors or controllers

Operator warning and vehicle stop light control

Fault diagnostics for easy troubleshooting

Electronically Enhanced Full PowerBrake System (See Figure 2)

The addition of electrohydraulics to enhance a hydro-mechanical full power system allows designers to add

control flexibility to the brake system while maintainingthe hydromechanical tradition and redundancy of thesingle modulating brake valve. The pedal anglesensor, electronic control unit (ECU), andelectrohydraulic modulating brake valve are used toprovide programmable pressure vs. pedal anglefunction to the brake system. Features of this type ofsystem include:



Easy to add additional remote operator stations

Automated braking can be programmed to occurbased on inputs from other sensors or controllers

Many of the benefits of electrohydraulic braking,with the back-up of hydromechanical braking

Operator warning and vehicle stop light options

Brake pressure controls are in parallel - brakereceives highest pressure of hydromechanical orelectrohydraulic valve

FIGURE 1

ACCUMULATOR 2

ACCUMULATOR 1

BRAKE-BY-WIRE

CONTROLLER

(OPTIONAL)MICO REMOTE

INPUT PEDAL

MICOSINGLEMODULATING

BRAKEVALVE


CHARGINGVALVE

MICOELECTROHYDRAULICBRAKE VALVE

P T

B

A P

T

MICOELECTROHYDRAULICBRAKEVALVE

P T

B

FIGURE 2

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MICO

TANDEM

MODULATING

BRAKE

VALVE

ACCUMULATOR 2

ACCUMULATOR 1

SPEED SENSOR 3 SPEED SENSOR 4

SPEED SENSOR 2SPEED SENSOR 1

ABS ELECTRONIC

CONTROL UNIT

ABSVALVE 1

ABS VALVE 4ABSVALVE 3

ABSVALVE 2

MICO DUAL

ACCUMULATOR

CHARGINGVALVE

A

P

T

A

P

T

B

P T

B

T P

P T

B

T P

B

Full Power Brake System with ABS(See Figure 3)

Vehicle safety can be improved with the use of ananti-lock brake system giving operators controleven in poor traction conditions. A typical hydro-mechanical full power brake system is shown

consisting of a pump, accumulator charging valve,dual accumulators, and tandem modulating brakevalve. ABS valves are normally open, which allowthe tandem modulating brake valve to controlbraking pressure proportional to operator inputforce at the brake pedal. Speed sensors sendelectronic pulses, at a frequency proportional towheel speed, to the ABS electronic control unit(ECU). The ABS electronic control unit algorithmdetermines how much current is sent to each ofthe ABS valves. When the ABS valve receivescurrent, pressure from the tandem modulatingbrake valve is blocked to the brake and pressure atthe brake relieved. This allows the wheel tocontinue turning rather than slipping excessively.

See MICO Hydraulic Brake System with ABS

Brochure (form number 80-950-243.)

Full Power Brake System withTraction Control (See Figure 4)

A full power brake system with traction control canhelp maintain traction in poor traction conditions. Atypical hydromechanical full power brake system is

shown consisting of a pump, accumulator chargingvalve, dual accumulators, and tandem modulatingbrake valve. Electrohydraulic brake valves arenormally open, which allow the tandem modulatingvalve to control braking pressure proportional tooperator input force at the brake pedal. Speedsensors send electronic pulses, at a frequencyproportional to wheel speed, to the traction controlsystem electronic control unit. The TCS electroniccontrol unit algorithm determines how muchcurrent is sent to each of the electrohydraulicbrake valves. When the electrohydraulic brakevalve receives current, pressure from the

accumulators is used to modulate pressure to thebrakes. This stops the wheel from turningexcessively and improves the vehicle's traction.The check valve reduces the pressure dropthrough the electrohydraulic brake valve when thetandem modulating brake valve is applied to fill thebrake cylinders. This series circuit is also an optionto the parallel circuit, Figure 2, for doing

electronically enhanced braking. See MICO

Hydraulic Brake System with Traction Control

Brochure (form number 80-950-258).

FIGURE 3

P

B

A

P

B

A

MICOTANDEMMODULATINGBRAKEVALVE

ACCUMULATOR 2

ACCUMULATOR 1


TCS ELECTRONICCONTROL UNIT



BRAKE VALVE


CHARGING VALVE

A P

T

A P

T

FIGURE 4


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TP

B

B

TP

T A

B

ACCUMULATOR 1

ACCUMULATOR 2




BRAKE VALVE



BRAKE VALVE


MICOELECTRONICPEDAL

ELECTRONICCONTROL UNIT 1

ELECTRONICCONTROL UNIT 2

B

AT

P

P

Electrohydraulic Brake System with ABSand Traction Control (See Figure 5)

When designers want to remove the brake valve fromthe cab, electrohydraulic brake systems should beconsidered. ABS and traction control can be added asshown in the previous examples. However, in this

system the electrohydraulic brake valves control thebrake system at all times. Each key component in thesystem has redundancy to assure reliability. Features ofthis type of system include:


ABS and traction control for improved control


Ability to easily add additional remote operatorstations

Automated braking can be programmed to occurbased on inputs from other sensors or control

systems

Operator warning signal and vehicle stop light control


Simplest system for electrohydraulic control of eachbrake pressure

FIGURE 5


MICOELECTRONICPEDAL

BRAKE-BY-WIRECONTROLLERWITH INCHING

BRAKEWARNING

+VBRAKELIGHT


BRAKEVALVE


BRAKEVALVE

MICOACCUMULATOR

CHARGING VALVE

ACCUMULATOR

TRANSMISSIONOR

CLUTCH

B

T P

PT

B

Electrohydraulic Brake System with InchingControl (See Figure 6)

This system allows the machine operator to haveproportional inching and braking control in one pedal.

The first part of pedal travel is devoted to inching control.The second part controls braking. There can be a stepin pedal effort at the midpoint of pedal travel to indicateto the operator that further pedal travel results in appli-cation of the vehicle's brakes. During inching theelectrohydraulic controller interprets the inching signaland controls the transmission or clutch by means of anelectrohydraulic pressure modulating valve. Duringbraking the electrohydraulic controller interprets thebraking signal and controls the amount of braking bymeans of a second electrohydraulic brake valve.Features of this type of system include:

Ability for designers to remove the brake valve andhydraulic hoses from the operator station

Elimination of complicated linkages and valves forcontrol of inching and braking

Pedal force feedback is dual gain and proportional topedal angle

Programmable set points and gains for inching andbraking

Operator warning and vehicle stop light control


FIGURE 6

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Electrohydraulic Brake System for Trailers(See Figure 8)

This is a very simple way to provide full power brakingon the trailer. This system works with any type of towvehicle brakes including brake fluid, air brakes, or fullpower. For best performance the pressure rating of thetransducer should be as close as practical to themaximum expected vehicle brake pressure. The valvedriver, or controller, and electrohydraulic brake valvecan be mounted wherever it is most convenient.

Additional features such as spring applied hydraulicrelease brakes, break-away switches, stop light control,and operator warning lights can be easily added.Features of this type of system include:

Trailer brakes proportional to tow vehicle brakepressure

Trailer brakes can be actuated at a stop, unlikesurge brakes

Break-away switch can be easily added

Automated braking can be programmed to occurbased on inputs from other sensors or controlsystems

One trailer system works with any tow vehiclesystem


ACCUMULATOR

MICO

RATIOMETRICPRESSURETRANSDUCER

MICOELECTROHYDRAULICBRAKEVALVE

P T

A

MICO

VALVE DRIVER

TOWVEHICLE

BRAKE SYSTEM

TOVEHICLE

FRONT BRAKES

COIL (+)

COIL (-)CURRENTSENSING ANDREGULATION

I

AMPS(PSI)

CONTROL INPUT

PWM DRIVER

VOLTAGEREFERENCEGENERATOR

CONTROL COMMON (SIGNAL GND)

CONTROL INPUT A

CONTROL INPUT B

5VDC REF.OUT

SUPPLY (-) GND

SUPPLY (+) POWER

BATTERY

GND

OUTPUT

SUPPLY0

BRAKE PRESSURE

OUTPUT V

0.5

u


FIGURE 8

MICO

TANDEM

MODULATING

BRAKEVALVE

with PILOT

APPLY

MICO ELECTROHYDRAULIC

BRAKEVALVE



ELECTRONIC

CONTROL UNIT

AA

A

ABSVALVE 1

ABSVALVE 4ABSVALVE 3

ABSVALVE 2

A

T P

ACCUMULATOR 2

ACCUMULATOR 1

MICO DUAL

ACCUMULATOR

CHARGINGVALVE

Hydraulic Brake System with ABS andTraction Control (See Figure 7)

Hydraulic brake systems with ABS and traction controlcan improve vehicle performance and operator safety. Asystem of this type provides shorter stopping distances,improved vehicle stability, and enhanced traction for

vehicles driven under extreme operating conditions.These are important concerns for the drivers andoccupants of vehicles operated on and off the highway.

The basis of this system is a hydromechanical fullpower brake system consisting of a pump, accumulatorcharging valve, dual accumulators, and a tandemmodulating brake valve. To obtain the ABS and tractioncontrol features, electrohydraulic brake valves, a pilotsection for the tandem modulating brake valve, speedsensors, pressure transducers and an electronic controlunit are added. See MICO Hydraulic Brake System

with ABS and Traction Control Brochure (formnumber 80-950-261).

FIGURE 7

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DESCRIPTIONThe MICO T-Series Valve Driver is programmed towork with MICO Electronic Pedals and MICOElectrohydraulic Brake Valves. The controller isconfigured to accept dual inputs for redundancy. It alsoprovides a pulse width modulated current control outputto drive electrohydraulic brake valves. Dither current isprovided to optimize the performance of theelectrohydraulic brake system. Maximum valve currentis adjustable to allow the maximum brake pressure tobe set at maximum pedal travel.

Other configurations can be provided for inchingsystems, trailer braking systems, parking plus service

brakes, or differential locks. Please consult MICO,Incorporated for further details on custom programs.

FEATURES Unique redundant input signals allow multiple

operator stations or redundant input sensors

Accepts analog voltage inputs

Ignores input signals below 1.0 Vdc eliminatingrequirements for neutral switches in pedals

Output current remains at IMAX when input signal isabove 4 Vdc, so pedal travel wear does not effectbrake pressure

Provides regulated 5 Vdc power supply for externalsensors, such as those in MICO Electronic Pedals

Output signal is PWM current regulated assuring

consistent performance even as coil resistancevaries with operating temperatures and supplyvoltage changes

Maximum current, IMAX, is adjustable to set maxi-mum output

Diagnostic LEDs are provided for easy trouble-shooting

Can be powered by 9 to 32 Vdc

T-SeriesValve Driver

millimetersinches

NOTE: Mating connector with 45.7 cm (18 inch)pigtail is MICO part number 07-820-002

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Electronic Pedals withBrake Valve Interface

DESCRIPTION

The MICO

Electronic Pedal is designed for use inelectrohydraulic brake and/or electronic throttle controlapplications. It provides force feedback proportional topedal rotation. A rotary sensor provides one or moreanalog outputs that are proportional to pedal rotation. Avariety of pedal configurations and sensing options areavailable.

The pedal can be mounted to a MICO Single or TandemModulating Brake Valve. This configuration is especiallywell suited to machines with hydrostatic transmissions.The sensor output is used to destroke the transmissionand the brake valve applies the brakes when decelera-tion requirements exceed the transmission's capabilities.

Typical applications include drive-by-wire, electrohydra-ulic braking, machines with multiple operator stations,and propel and inching pedals for hydrostatic drivesystems.

For throttle applications, the pedal sensor can beconfigured to interface directly to the engine's electroniccontrol unit.

FEATURES

Robust design for brake and/or throttle applications

Ergonomic designs configured to your application

Enclosure protects sensor from mechanical damage

Variety of sensor options available

Sensors include diagnostic regions for monitoringwiring and sensor integrity

Adjustable return stop allows initial position to becontrolled

Stainless steel pins with bushings for harshenvironments

Single or tandem modulating brake valve can beintegrated into pedal

OPTIONS

Right or left side sensor mount for a variety of cablayouts

Firewall or floor mounted designs

Ergonomic variations: feedback torque range, initialpedal angles, and pedal angle range

Various connector configurations

Product Family

Electronic pedals

Spring Pack

B = Brake springsI = Inching springsT = Throttle springsV = Valve mounting spring packK = Step in force at end of stroke

Mounting

S = SuspendedT = Treadle

Pedal Angle at Normal Position

20 = 20(See pedal angle chart)

Base Options

R = Right side sensor locatorL = Left side sensor locator

Sensor

C = One potentiometer plus a low power (SPDT)switch

D = Single proportional hall effect - normally lowH = Single proportional hall effect - normally highJ = One potentiometer plus idle validation and

transmission kick down (SPDT) switchesP = Three potentiometers

Unique Identifier

U = Non-standard (contact MICO, Incorporated)P = Proprietary

Cable Exit From Base

A = Sensor cable exits through mounting surfaceand switch cables are internal to cab

B = Through mounting surfaceF = Exit downward when suspended away from

operator when treadle

R = Exit upward when suspended towardsoperator when treadleS = Side out exit parallel to axis of pedal rotation

Electrical Cable Connection

A = Metri-pack 150 plus Deutsch DTM04-3PD = Deutsch DT04-3PM = Metri-pack 150

Electric Cable Length

000 = No cable040 = 40 centimeters

ELECTRONIC PEDAL MODEL CODES

BEP T 44 L P 000B M U

Not all model code combinations are available.Please call MICO, Incorporated for availability.

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millimetersinches

Dimensions will vary slightly between units and are to be used for reference purposes only.

Sample configurations shown. Contact MICO, Incorporated for more detailed mounting dimensions.

Sensor Codes(See page 8)

P C or J D or H

Treadle(Pedal at normal position)

20, 30, or 40 24, 34, or 44 15, 25, or 35

Suspended Pedal(Pedal at normal position)

58 62 53

Pedal Rotation to FullApply 25 29 20

Contact MICO, Incorporated for other pedal angle options.

Typical Treadle Configuration(floor mounting)

Typical Suspended Configuration(firewall mounting)

Pedal Angle Chart

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EBV Series ElectrohydraulicBrake ValveU.S. Patent Number 6,802,330

DESCRIPTIONThe MICO Electrohydraulic Brake Valve, EBV series,is a full power valve for modulating output pressures upto 207 bar (3000 PSI) in proportion to the input current.This valve, in a full power brake system, provideshydraulic power for normal and emergency power-offbraking for electrohydraulic brake systems, anti-lockbrake systems, and traction control systems.

FEATURES

Patented design makes maximum use of thesolenoid stroke and force to improve reliability andperformance

Valve can be remotely mounted - moving thehydraulic plumbing noise away from the operator

Direct acting valve simplifies design, whicheliminates the continuous flow and small orificesof a pilot valve

Low valve leakage keeps accumulator sizes smallfor emergency power-off braking

High force solenoid reduces the effects of frictionand contamination

Low resistance coil allows full pressure output withlow input voltage, higher temperature operation, orcontinuous use

Optimized specifically for the unique performancecharacteristics of full power braking or clutchingapplications

Manual override provides a way to mechanicallyopen the valve if electrical power is lost

OPTIONS

Various output pressure ranges

Various circuit configurations, hydraulic apply springrelease (HASR), traction control, ABS, spring applyhydraulic release (SAHR), etc.

Multiple valves and accessories integrated into asingle housing

High impedance coil options for controllers withlimited current capability

Brake pressure with no current can be zero,

maximum, or intermediate values

millimetersinches

Sample configuration shown. Other configurations are available - Contact MICO, Incorporated.

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ANSI Symbols

A

Valve Function

A = ABS antilock brake valve

M = HASR modulating brake valveR = Reverse modulating brake valveS = SAHR modulating brake valveT = Electronic traction control valve

Coil Voltage

012 = 12 Vdc standard014 = 12 Vdc high impedance

024 = 24 Vdc standard028 = 24 Vdc high impedance

Manual Override Option

R = Manual overrideN = No manual override

Seals

N = NitrileV = Viton

Pressure Range

35 = 35 bar EBV-S36 = 36 bar EBV-M, EBV-T50 = 50 bar EBV-M, EBV-S, EBV-T

88 = 88 bar EBV-S90 = 90 bar EBV-M, EBV-T139 = 139 bar EBV-S143 = 143 bar EBV-M, EBT-T150 = 150 bar EBV-A197 = 197 bar EBV-S200 = 200 bar EBV-M, EBV-T

Unique Identifier

Blank = Standard productP = ProprietaryU = Non-standard (contact MICO, Incorporated)

EBV VALVE MODEL CODES

Product Family

Electronic modulating brake valve

Housing Options

D = DualM = Monoblock single valveP = Sandwich mountingS = Subplate mounting

MEBV M S08 N D 024 R N 36 U

Check Valve Options

A = Accumulator check from P to accumulator portB = Check from modulating valve port to brake portC = Reverse flow check from B to PN = No integrated check valves

Electrical Connection

D = Deutsch DT04-2P

Porting

B04 = G 1/4 BSPP portsS06 = SAE 6 ports per SAE J1926S08 = SAE 8 ports per SAE J1926S99 = Mixed SAE portsN04 = Subplate mounting

HASRModulating

Brake Valve

SAHRModulating

Brake Valve

ReverseModulating

Brake Valve

ElectronicTraction

Control Valve

ABSAnti-lock

Brake Valve

Not all model code combinations are available.Please call MICO, Incorporated for availability.

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MICO has made every attempt to present accurate information incatalogs, brochures, and other printed material. MICO can acceptno responsibility for errors from unintentional oversights that mayexist. Due to a continuous program of product improvement, bothmaterials and specifications are subject to change without notice orobligation. Refer to www.mico.com for the most recent versions ofour literature. If you have any further questions, please call MICO.

Form No. 84-950-028 Revised 2010-01-07 Printed in U.S.A.

Innovative Braking and Controls Worldwide

MICO is a registered trademark of MICO, Incorporated. MICO is registered

in the U.S. Patent and Trademark Office as well as in Australia, Indonesia,

Japan, Peoples Republic of China, South Korea, and the European Community.

MICO, Incorporated

1911 Lee Boulevard

North Mankato, MN U.S.A. 56003-2507

+1 507 625 6426 +1 507 625 3212Tel: Fax:

MICO Europe Ltd.

Goodwood Road / Pershore

Worcestershire Wr10 2RY England

+44(0)1386 555562 +44(0)1386 553955Tel: Fax:

Web Site: www.mico.com

PRODUCT LINE:

Brakes

Brake Locks

Controls

Cylinders

Master Cylinders

Valves

Miscellaneous Components

Caliper Disc BrakesMultiple Disc Brakes

ElectricMechanical

Electronic ControlsHydraulic Throttle ControlsPedal Controls

SwitchesTransducers/Sensors

Drive Axle Brake ActuatorsSlave CylindersWheel Cylinders

Boosted CylindersHydraulically and Air ActuatedStraight Bore CylindersTwo-Stage Cylinders

Accumulator ChargingElectrohydraulic BrakePark Brake

Pressure Modulating

In-line Residual Check ValvesPump with Integrated ValvesReservoirs

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