The flowtronic d features software with many features including control loop customisation so the valve can be tuned to the application. Its primary components are a screwin proportional pilot control valve 1 and the main valve 2. Rexroth proportional valve 4wrke heash technique b. Proportional directional valve, direct operated without electrical. Rexroth proportional valve 4wrpeh heash technique b. They can control a flow, which is determined by an electrical command value, in a pressure and largely temperaturecompensated way.
The valves are actuated by a proportional solenoid acting. Rexroth proportional valve suppliers reliable rexroth. Dither amplitude is adjustable from 0 to 10% of rated maximum current. In the integrated electronics, the specified command value is compared with the position actual value. Jun 15, 2016 gpm instructor hank ayers explains how to troubleshoot proportional valves. A sandwich plate pressure reducing valve can be used to protect the pump in the event of overflow. The hysteresis and repeatability of the valve are improved by this practice. By means of the training systems, both newcomers and advanced. The control edge geometry was designed and optimised for use as a pilot control valve for the proportional directional valves type 4wrke. Directional spool valves, direct operated, with solenoid. Valve plate cylinder 5 40 m 1,5 10 m servo valve control piston baf. Ex eb mb iic t4 gb according to en 600797 en 6007918. Rexroth proportional valve 4wrze heash technique b. A complete training system consists of the hardware and the training and project manuals for trainers and trainees.
In mobile excavators proportional control valves are widely used to move the arms and buckets smoothly. Industrial hydraulics training courses bosch rexroth ag. With bosch rexroth industrial hydraulics you will always find the right solution. The lvdt consists troubleshooting proportional valves page 5 bosch valves. Proportional pressure relief valve, pilot operated rexroth bosch. Proportional directional valves, direct operated with. Rexroth proportional flow control valve 4wrap 6w70430g24k4m repaired at synchronics. Understanding and troubleshooting proportional valves. Our knowledge and expertise is invaluable in assisting your company with old and new series bosch rexroth servo and proportional valve repairs, as well as any of the standard directional, flow and pressure control valve repair and replacement needs. Rexroth branded and bosch branded proportional valves. Proportional valves, on the other hand, are used to control the acceleration andor speed of a load, therefore, providing smooth control of both opening and closing as well as the amount of flow once open.
A wide variety of exercises, along with component and sets, are available for all kinds of practical hydraulics applications e. The elevator used a pressurecompensated pump with a threeposition proportional directional valve, filters, and a relief valve. A simple circuit was designed to lift large castings on an elevator from a conveyor at floor level to another conveyor located high in the building. Goto proportional valves ships in 10 business days. Welcome to bosch rexroth limited training services.
The directional control valve allows reversal of the direction of rotation or of movement at the user. The manual override 2 allows for the adjustment of the valve without solenoid energization. Proportional, highresponse and servo valve accessories. Introduction to proportional servo valves full lecture. The valve can be ordered in conjunction with a separate electronic amplifier card model 4 ws, or it can also be ordered with the electronics integrated into the valve model 4 wse depending on what is best for the application. With the ds2na training system, bosch rexroth offers you an excellent costeffective entry into the extensive world of rexroths training. Pdf file of this page valve coils and electronic controllers toc electronic vehicle controls intro.
Proportional valve technology openclosed loop mobile hydraulics pneumatics electropneumatics sensor and plc technology training. Comparison between conventional and proportional valves. With the ds2na training system, bosch rexroth offers you an excellent costeffective entry into the extensive world of rexroth s training. Rexroth valves 4wrae, one of the 42 and 43 proportional directional valves. Proportional valves have become increasingly popular since the mid 1980s and have replaced servo valves in many applications. We want to provide you with the best information possible.
An accessory kit with sandwich plate pressure reducing valve can be ordered from rexroth under part number r902490825. Use our convenient form at right to email us your question. Electrohydraulic 4way directional servo valve model 4 ws. Proportional valves the 42 and 43 proportional valves. This keeps air bubbles from being trapped in the solenoid tube causing spool oscillation. Rts2stv is suitable for controlling servo solenoid pilot operated twostage valves. Understanding and troubleshooting proportional valves gpm. Genuine bosch rexroth hydraulic pumps, motors, valves and other parts. Rexroth proportional valves for the internal function test of the hydraulic. Proportional pressure relief valve, pilot operated model dbem and dbeme features 1 ordering code 2 preferred types 2 symbols 2 function, section 3 technical data 4 and 5 control electronics 5 and 6. Neal hanson 3182011 product management bosch rexroth ag 2010.
This valve is to be considered a part and not a complete control. Managing high or variable back pressure regenerative or proportional systems use a fullybalanced relief valve 1ceb, 1cebd many types of equipment with proportional systems create backpressure as described earlier with a closed center directional valve system. Bosch rexroth is now offering a comprehensive family of software engineering tools or etools, that covers. We supply new and original rexroth proportional valves 4wrze, such as 4wrze 10, 4wrze 16, 4wrze 25, 4wrze 32, 4wrze 52, and 4wrz and 4wrh valves. Sizes in ng10 d05, ng16 d07, ng25 d08 and ng32 d10. Sequence valves, counter balance and overcentre valves. Acceleration control using proportional valves part 1 of. Bosch rexroth pilot operated servo solenoid valves womack. Proportional, highresponse and servo valves rexroth bosch. Pumps 10 industrial hydraulics bosch rexroth ag variable displacement pumps compact units valve technology valve port. It is used to limit the pressure in hydraulic systems. Proportional flow control valve with integrated pressure. As well as a load sensing directional control valve. Training systems for hydraulics 3 bosch rexroth ag 01.
This will provide accurate positioning of the valve spool. Ets has over 25 years of sales and service experience with the bosch rexroth group in the u. With their integrated electronics obe they reduce the required wiring and simplify the handling while at the same time providing exact reproducibility and a low. The cost of a proportional valve can be as much as 50 percent of the cost of a servo valve of the same size. Pvg 32 proportional valves see how to maximize flexibility. Bosch rexroth parts, hydraulic pumps, motors and valves.
Rexroth proportional valve suppliers directory choose quality verified rexroth proportional valve suppliers and manufacturers, wholesale rexroth proportional valve sellers and exporters at. Bosch rexroth ag table of contentsindustrial hydraulics 3 page pum ps 7 valves proportional, highresponse and servo valves 66, 86 proportional directional valves 72 proportional pressure control valves. Bosch rexroth pilot operated proportional directional valves the proportional pilot valves drive a main stage with 20% overlap thereby providing open loop control for greater flow rates. The spool in a standard 2positionsolenoidoperated valve shifts all the way to its new. Electronic and electrohydraulic controls proportional valve controllerssetup instructions. They employ a check valve for the free flow direction, a relief. Vepvef, electropneumatic proportional valve vepvef, electropneumatic proportional valve a proportional control valve system provides the ability to infinitely control the position of the internal spool assembly which increases or decreases the amount of flow or pressure being released from the valve. Training technical catalogues energy tools to enhance the energy ef. Proportional pressure relief valves, direct operated. Directly operated ng6 and 10 valves with positive overlap, actuated on both. Choose from a wide range of servo valve accessories, including supply pressure compensators and discharge isolator pressure compensators. Valin customers and partners can take part in our training seminars, courses and webinars through valin university. Proportional valve spools nominal flows pressure drops power limits performance terms 4. Troubleshooting proportional valves page 1 bosch valves.
The pilot valve pressure relief valve pilot stage is supplied internally with a controlled flow of pilot oil. The effects of static friction on the operation of the solenoid are reduced by the application of a small ac current. Welcome enquiry us if you interested in rexroth valve 4wrke or any other rexroth proportional valves and servo valves. Understanding proportional valves introduction to our 4 day training at cmafh training center.
In conjunction with amplifier vt5041, it controls the swashplate angle of the pump in either closed loop pressure or flow control. Proportional pressure reducing valves, pilot operated. These documents are for servo valves, proportional valves, including directional, pressure, and flow control versions. Progress fluid proportional valve rexroth bosch group duration. Well learn that controlling the ramp up and down rate of applied. They are used to limit the operating pressure in hydraulic systems. Our knowledge and expertise is invaluable in assisting your company with old and new series bosch rexroth servo and proportional valve repairs, as well as any of the standard directional, flow and pressure control valve.
These 43 directional highresponse valves are direct operated components of sandwich plate design. Here, the fixed pump and flow controller have been replaced by a variable pump. Home products product groups focused delivery program goto hydraulics proportional valves. To satisfy system engineers and designers, we also offer an onsite servo, proportional, or pump controls seminar at your facility. On the proportional solenoid, there is moreover a housing 19 with the control electronics.
Hydraulictraining axial piston units basic principles. Rexroth training systems bosch rexroth training systems are based on standard components from the various bosch rexroth product areas. Understanding proportional valves introduction to our 4. Counterbalance valves introduction they are modulating valves which allow free flow into the actuator and then block the reverse flow until they feel a pilot pressure inversely proportional to the load in the pilot line.
Proportional pressure relief valve, pilot operated dbeme 520 re 29361, edition. The ds2na training system is a compact basic solution in the. Sep 24, 2016 in this lesson well take a brief introductory look at proportional servo valves. Proportional pressure reducing valve, direct operated. Pvg 32 is designed for maximum flexibility configurable as an advanced electrically controlled proportional valve. Ets also carries solutions forrepair and replacement spare parts of hydromatik, brueninghas, uchida. Actuation by means of a proportional solenoid with electrical feedback. In this lesson well take a brief introductory look at proportional servo valves. Well discuss how proportional valves serve to control both flow rate and direction as well as examine.
Rexroth training systems bosch rexroth training systems are based on standard components from different bosch rexroth product areas. Proportional pressure relief valves bosch rexroth usa. The solenoids are controlled by integrated control electronics. Proportional, highresponse and servo valves bosch rexroth ag.
E, edition, bosch rexroth ag directional spool valves, direct operated, with solenoid actuation features 43, 42 or 32 dir ectional design highpo wer solenoid p orting pattern according to iso 440105040. In this lesson well take a look at acceleration and deceleration control of hydraulic actuators using proportional valves. Rexroth training uses industry standard components you will find on varied applications within your working environment, providing a perfect starting point towards an industry standard qualification such as the british fluid power association industrial hydraulics level 1 certificate. Bosch rexroth is the markets leading industrial hydraulics provider, offering the worlds largest range of highquality proportional and hydraulic servo valves. Variable output speed is achieved by installation of a flow controller for variable flow.
An lvdt linear variable differential transformer is used to convert the position of the spool into a proportional electrical signal. Dbeme, series 7x proportional pressure relief valves limit pressure in hydraulic systems, where higher flow may be required. The ds2na training system is a compact basic solution in the technology fields of hydraulics, pneumatics and automatic control engineering and can thus be used in versatile applications. However, servo valves continue to be used where precise positioning or speed control is required in aircraft, aerospace and turbine generator applications. Proportional valves highresponse directional valves, direct operated with electrical position feedback 4wrpe series 3x 4wrpe10 series 3x is high performance, direct operated, proportional valve. Proportional valves highresponse valves servo valves proportional valves.
The pressure relief valve dbv protects the system from overload. Comparison between conventional and proportional valves methods of control comparison between analogue and digital control. The ramps can be controlled by external voltage signals. Bosch rexroth pilot operated servo solenoid valves the servo solenoid pilot valve drives a zero lap main stage thereby controlling greater flow rates. Training courses industrial hydraulics bosch rexroth ag. D1fhe80mcnbj0030 parker proportional valve high response servo valve with an onboard drive amplifier.
Hydraulic proportional and closed loop system design. Bosch rexroth pilot operated proportional directional valves. Pilot valve for the pressure and flow control system syhdfe. This page contains details of all the training courses available now from rexroth for industrial hydraulics applications. The ng6 size proportional valve solenoidoperatesoffofa variable current signal, usually 2. Digital controller for proportional solenoid valves control d is a pid controller that controls the current to a solenoid coil, making any solenoid valve respond proportionally to an electrical control signal.
The cost of a proportional valve can be as little as 50% of the cost of a servo valve used for the same purpose. All direct operated proportional valves have power. Visit our website at to learn more about our twopart training. Model 4 ws, requires separate electronic amplifier to control this valve an external electronic control servo. Mobile technology vehicle our mobile technology vehicle is hitting the road this year.
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