Rexroth electro-hydraulic directional valve 4WEH16R7X/6EW230N9ETS2K4

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Rexroth Electro Hydraulic Directional Valve R901072797 (4WEH16R7X/6EW230N9ETS2K4) Product Introduction

As the core model of Bosch Rexroth 4WEH16 series pilot operated electro-hydraulic directional valve, R901072797 (4WEH16R7X/6EW230N9ETS2K4) is specially designed for medium and high pressure, high flow hydraulic systems. With precise control and high reliability driven by electro-hydraulic cooperation, it has become the preferred control component in industrial automation, engineering machinery, metallurgical equipment and other fields, which can efficiently achieve the switching of oil flow direction and precise start stop and directional control of execution components.

1、 Core specification parameters

table

parameter itemspecific parameters

Product Model4WEH16R7X/6EW230N9ETS2K4

Order NumberR901072797

Nominal DiameterNG16（16mm）

Maximum work pressure350 bar

maximum flow1100 L/min

Drive TypeElectro hydraulic pilot control (wet AC electromagnet)

power supply voltageAC 230V

Installation methodBottom plate installation (ISO 4401 standard oil port)

Valve core resetSpring alignment

Operating Temperature-20℃ ～ +80℃

2、 Core advantages

1. Efficient electro-hydraulic collaborative drive

Adopting a combination structure of "pilot valve+main valve", the pilot valve is driven by a small AC 230V electromagnet, and the main valve core is driven to change direction by controlling the oil pressure, achieving low-power control of large flow, balancing response speed and energy-saving effect, suitable for AC 230V power supply scenarios, without the need for additional power conversion.

2. Accurate and stable control performance

The slide valve type main valve core is precision ground and processed, combined with a spring centering design, to ensure precise directional action and rapid response, and can achieve shock free switching of oil flow direction, reducing system impact and vibration; Built in manual emergency operation device, which can manually switch valve positions in case of power failure or malfunction, ensuring system safety and convenient debugging.

3. High voltage resistance and long lifespan design

The valve body is made of high-strength cast iron material, coated with anti-corrosion coating on the surface, and can withstand high pressure conditions of 350 bar, suitable for harsh industrial environments; The valve core and sleeve are precisely matched, verified through millions of directional changes, wear-resistant and anti pollution, greatly extending the service life of the equipment and reducing maintenance costs.

4. Standardization and flexible adaptation

The oil port layout complies with the ISO 4401 international standard, compatible with mainstream valve blocks and installation interfaces, easy to install, and highly versatile; Support optional configuration of internal/external pilot control, which can be paired with extended components such as time adjusters and terminal position indicators to meet diverse hydraulic system requirements.

3、 Typical application scenarios

Industrial automation: the directional control of the executing components (oil cylinders, motors) of injection molding machines, hydraulic presses, CNC machine tools and other equipment to ensure the precise operation of automated production lines;

Construction machinery: hydraulic systems for excavators, cranes, loaders, and other equipment to achieve motion switching and load control under high flow conditions;

Metallurgical equipment: High pressure and high load scenarios such as rolling mills and continuous casting equipment, stable control of oil flow direction, ensuring continuous operation of equipment;

Energy and special equipment: wind power variable pitch system, nuclear power plant hydraulic auxiliary system, etc., adapted to special working conditions with explosion-proof characteristics and high reliability.

4、 Selection and usage points

Power supply matching: A stable AC 230V power supply is required, and the wiring of the electromagnet must comply with the EN 175301-803 standard to ensure electrical connection safety;

Pilot control: internal pilot oil supply is preferred. When there is no internal oil supply condition, it can be switched to external pilot control (oil port X). It is necessary to ensure that the pilot oil source is clean;

Medium adaptation: It is recommended to use mineral oil hydraulic oils such as HL and HLP, and the cleanliness of the oil should comply with ISO 4406 standard to avoid impurities from wearing the valve core;

Installation requirements: Install according to ISO 4401 standard positioning, ensuring good sealing between the valve body and valve block to avoid leakage affecting system pressure.

summary

The Rexroth R901072797 (4WEH16R7X/6EW230N9ETS2K4) electro-hydraulic directional valve, with Bosch Rexroth's precision manufacturing process and mature technology accumulation, achieves precise and stable control under high flow and high pressure conditions, with high reliability, easy adaptability, and long service life. It is the core solution for directional control of medium and large hydraulic systems. Whether it is integrating new systems or upgrading existing equipment, it can quickly adapt and improve the operational efficiency and safety of hydraulic systems.

Accurate control, as stable as a rock - Successful application of Rexroth electro-hydraulic directional valve in large-scale metallurgical continuous casting machine

In the steel metallurgy industry, the continuous casting production line is the core link that determines the quality of steel and production efficiency. Its hydraulic system needs to ensure millisecond level precise response and absolute stability of key actions such as crystallizer vibration, straightening machine drive, and sector roller gap adjustment under harsh conditions of high temperature, dust, high load, and continuous uninterrupted operation. The Bosch Rexroth 4WEH series electro-hydraulic directional valve (such as model 4WEH16R7X/6EW230N9ETS2K4) has become the core solution for the upgrading and renovation project of a large steel group's slab continuous casting machine in China due to its performance.

1、 Project Background and Challenges

The steel group's original continuous casting machine has been in service for over 10 years, and the hydraulic control system is aging, mainly facing three major pain points:

Insufficient control accuracy: The vibration of the crystallizer and the response of the sector adjustment lag, resulting in defects such as vibration marks, cracks, inclusions, etc. on the surface of the casting blank, and a high defect rate.

Poor stability: Frequent reversing leads to significant hydraulic impact, rapid loss of pipelines and seals, and an average of 2-3 maintenance shutdowns per month, seriously affecting production capacity.

Weak environmental adaptability: The on-site temperature exceeds 60 ℃, the dust concentration is high, and domestic valves are prone to jamming and internal leakage, with a lifespan of only 60% of the design standard.

In order to improve product quality and achieve 24-hour uninterrupted and efficient production, the customer has decided to replace and upgrade the entire hydraulic control unit with domestic production. The core requirements are high pressure, large flow rate, high precision, and long service life.

2、 Rexroth Solution

After multiple comparative tests, the project team ultimately selected the Rexroth 4WEH16 series electro-hydraulic directional valve (order number R901072797) as the core control component.

Core selection: 4WEH16R7X/6EW230N9ETS2K4

Adaptation conditions: nominal diameter NG16, maximum working pressure 350bar, maximum flow rate 1100L/min, matching the hydraulic requirements of continuous casting machine with high flow rate and high pressure difference.

Technical highlights:

Electro hydraulic pilot, precise drive: using AC230V wet electromagnetic coil, fast response, controlling large flow oil circuit with small signal, achieving precise and shock free commutation of crystallizer vibration frequency (0-400 times/min).

Explosion proof and durable, suitable for high temperatures: increased safety explosion-proof design (ETS2), suitable for high-risk metallurgical environments; High strength cast iron valve body and special wear-resistant valve core can work stably at * * -20 ℃~+80 ℃ * *.

Spring centering, reliable reset: The precision spring centering structure ensures a repeat accuracy of ≤ 0.5% FS for each commutation position, eliminating position drift.

Standard interface, easy replacement: compliant with ISO 4401 installation standards, no need to modify valve blocks, can directly replace old valves, greatly reducing the renovation period.

3、 Implementation effectiveness and customer value

After the comprehensive use of the Rexroth 4WEH16 series valve components, the hydraulic system performance of the continuous casting machine has achieved a qualitative leap:

Significant improvement in product quality

The precision of crystallizer vibration control has been improved by 30%, the depth of vibration marks on the surface of the casting billet has been reduced by 50%, the internal density is uniform, and the defect rate of the slab has been reduced from 8.5% to 2.1%, successfully meeting the strict quality standards of automotive plates and pipeline steel.

Equipment stability and lifespan doubling

The valve components have strong resistance to pollution and impact, with continuous and stable operation for over 12 months. The maintenance cycle of the hydraulic system has been extended from 1 month to over 6 months, reducing annual downtime by over 200 hours and increasing annual production capacity by 15%.

Significant reduction in comprehensive operation and maintenance costs

Compared to old valves, Rexroth products reduce internal leakage by 70% and system energy consumption by 12%; Meanwhile, the long lifespan and low failure rate have resulted in an average annual reduction of 40% in spare parts procurement and manual maintenance costs.

Security redundancy enhancement

Equipped with a built-in manual emergency operation device, the valve position can be manually switched in case of sudden power outage to avoid high-temperature red billet retention in the equipment and prevent major production safety accidents.

4、 Case Summary

The upgrade and renovation project of the large-scale metallurgical continuous casting machine fully confirms that the Rexroth 4WEH series electro-hydraulic directional valve is an ideal choice for heavy-duty, high-pressure, and high-precision industrial hydraulic systems. It not only overcomes the difficulties of high temperature, high dust, and high load working conditions with German precision quality, but also achieves multiple core values of improving quality, increasing efficiency, reducing costs, and ensuring safety for customers through stable and precise control.

From construction machinery to metallurgical equipment, from wind power to industrial manufacturing, Rexroth electro-hydraulic directional valves have always driven the operation of core equipment with reliable performance, becoming a trusted cornerstone of hydraulic control in the global industrial field.

The content of this article is based on publicly available products and network data. Please refer to the technical manual for actual selection and consider specific operating parameters.

Rexroth electro-hydraulic directional valve 4WEH16R7X/6EW230N9ETS2K4