Rexroth solenoid valve 4WE6D6X/OFEG24NZ5L in stock.

Brand

REXROTH/Germany Rexroth

Flow Direction

Other

3C Valve Category

Industry

Application Areas

Chemical, Petroleum, Energy, Electrical, General

Rexroth is committed to providing safe, precise, efficient, and cost-effective drive and control technologies for all types of machinery and systems. The company integrates global application experience to develop innovative products, tailoring system solutions and services for customers in every segment of the mobile machinery, mechanical applications and engineering, factory automation, and renewable energy markets. Bosch Rexroth also provides customers with a wide range of hydraulic, electronic drive and control, pneumatic, gear, linear drive, and assembly technologies. The company operates in over 80 countries worldwide, employing more than 37,500 professionals. In 2012, its global sales reached nearly €6.5 billion.

Business Segments

Mobile Machinery:

Construction machinery, material handling equipment, agricultural and forestry machinery, commercial/highway vehicles

Mechanical Applications and Engineering, Factory Automation:

Motion mechanisms, automotive industry, mining, oil and gas drilling (surface), stage technology, chemical industry, printing and paper processing, energy technology, material handling, glass machinery manufacturing, rubber processing, semiconductor and electronics industry, woodworking industry, horizontal directional drilling rigs, engines, plastics machinery and grinding mills, metallurgy, mining equipment, assembly and loading/unloading, dredgers, offshore engineering, processing and packaging, testing technology, recycling and waste management, marine engineering, motion simulation technology, solar energy, machine tools (cutting), hydraulic engineering, tunnel boring machines, metal forming machine tools and presses, conveying technology, fluid dynamics research, shipyard equipment, cement industry, sugar industry, pulp and paper machinery.

Rexroth solenoid valves are fundamental automation components used to control fluids. They are actuators, not limited to hydraulic or pneumatic systems. Used in industrial control systems to adjust the direction, flow rate, speed, and other parameters of the medium. Solenoid valves can be used with different circuits to achieve the desired control, ensuring both precision and flexibility. There are many types of Rexroth solenoid valves, each playing a different role in the control system, such as check valves, safety valves, directional control valves, and speed control valves.

Rexroth Solenoid Valve Selection Criteria:

1. Select the solenoid valve based on pipeline parameters: nominal diameter (DN) and connection type.

1) Determine the nominal diameter (DN) based on the inner diameter of the pipeline or flow requirements.

2) For connection type, generally, >DN50 requires a flange connection; ≤DN50 can be freely selected according to user needs.

2. Selecting Solenoid Valves Based on Fluid Parameters: Material and Temperature Group

1) Corrosive fluids: Corrosion-resistant solenoid valves and all-stainless steel valves are recommended; Ultra-clean edible fluids: Food-grade stainless steel solenoid valves are recommended.

2) High-temperature fluids: Solenoid valves made with high-temperature resistant electrical and sealing materials should be selected, and piston-type valves are preferred.

3) Fluid state: Fluids can be gaseous, liquid, or mixed, especially when the diameter is greater than DN25, these must be clearly distinguished.

4) Fluid viscosity: Generally, any viscosity can be selected below 50 cSt. If it exceeds this value, a high-viscosity solenoid valve should be selected.

3. Selecting Solenoid Valves Based on Pressure Parameters: Principle and Structural Types

1) Nominal pressure: This parameter has the same meaning as other general-purpose valves and is determined by the nominal pressure of the pipeline.

2) Working pressure: If the working pressure is low, a direct-acting or step-direct-acting principle valve must be selected; for low working pressure differentials above 0.04 MPa, direct-acting, step-direct-acting, and pilot-operated valves can all be selected. 4. Electrical Selection: AC220V or DC24V voltage specifications are preferred for ease of use.

5. Selection Based on Continuous Operating Time: Normally Closed, Normally Open, or Continuously Energized

1) When the solenoid valve needs to be open for a long time, and the continuous time is longer than the closing time, a normally open type should be selected.

2) If the opening time is short or the opening and closing times are infrequent, a normally closed type should be selected.

3) However, for some safety protection applications, such as furnace and kiln flame monitoring, normally open types cannot be selected; continuously energized types should be chosen.

6. Selection of Auxiliary Functions Based on Environmental Requirements: Explosion-proof, check valve, manual operation, waterproof mist, water spray, submersible.

Rexroth Solenoid Valve Selection Principles

Rexroth Solenoid Valve Safety:

1. Corrosive Media: Plastic King Solenoid Valves and All-Stainless Steel Valves are recommended; for highly corrosive media, diaphragm type valves must be selected. 1. For neutral media, solenoid valves with copper alloy valve bodies are preferable; otherwise, rust particles will frequently flake off from the valve body, especially in applications with infrequent operation. Copper cannot be used for ammonia valves.

2. Explosive environments: Appropriate explosion-proof products must be selected. For outdoor installations or dusty environments, waterproof and dustproof models should be chosen.

3. The nominal pressure of the solenoid valve should exceed the maximum working pressure within the pipe.

Rexroth Solenoid Valve Applicability:

1. Media Characteristics

1) Different types of solenoid valves should be selected for gaseous, liquid, or mixed states.

2) Different specifications of products should be used for different media temperatures; otherwise, the coil will burn out, the seals will age, and the lifespan will be severely affected.

3) Media viscosity is typically below 50 cSt. If it exceeds this value, a multi-functional solenoid valve should be used for a nominal diameter greater than 15 mm; a high-viscosity solenoid valve should be used for a nominal diameter less than 15 mm.

4) When the cleanliness of the medium is not high, a backwash filter valve should be installed before the solenoid valve. For low pressure, a direct-acting diaphragm solenoid valve can be used.

5) If the medium flows in a directional manner and backflow is not allowed, a bidirectional flow valve is required.

6) The medium temperature should be within the allowable range of the solenoid valve.

2. Piping Parameters

1) Select the valve port and model according to the medium flow direction requirements and pipeline connection method.

2) Select the nominal diameter according to the flow rate and valve Kv value; alternatively, the same as the pipeline inner diameter can be selected.

3) Working pressure difference: For low working pressure differences above 0.04 MPa, an indirect pilot-operated valve can be used; for low working pressure differences close to or less than zero, a direct-acting or step-by-step direct-acting valve must be used. 3. Environmental Conditions

1) The maximum and minimum ambient temperatures should be within acceptable ranges.

2) In environments with high relative humidity or exposure to water droplets or rain, waterproof solenoid valves should be selected.

3) In environments with frequent vibration, bumps, and impacts, special types should be selected, such as marine solenoid valves.

4) In corrosive or explosive environments, corrosion-resistant types should be selected based on safety requirements.

5) If space is limited, multi-functional solenoid valves should be selected, as they eliminate the need for bypasses and three manual valves and facilitate online maintenance.

4. Power Supply Conditions

1) Select AC or DC solenoid valves according to the type of power supply. Generally, AC power is more readily available.

2) For voltage specifications, AC220V and DC24V should be preferred.

3) Power supply voltage fluctuations are typically +10% to -15% for AC and ±10% for DC. If these fluctuations exceed the tolerance, voltage stabilization measures must be taken.

4) The rated current and power consumption should be selected according to the power supply capacity. Note that the VA value is higher during AC startup; indirect-acting solenoid valves should be preferred when capacity is insufficient.

5. Control Accuracy

1) Ordinary solenoid valves only have two positions: open and closed. Multi-position solenoid valves are required when high control accuracy and stable parameters are needed.

2) Activation Time: The time from the electrical signal being connected or disconnected to the main valve completing its action.

3) Leakage: The leakage values ​​given in the sample are for commonly used economic grades.

Performance Requirements

1. Reversing Performance

Under specified operating conditions, can the solenoid valve reliably reverse direction after being energized and reliably reset after being de-energized?

2. Pressure Loss

The pressure loss of a solenoid directional valve consists of flow loss and throttling loss generated when the fluid flows through the valve orifice.

3. Internal Leakage

The internal leakage of a solenoid directional valve refers to the leakage from the high-pressure chamber to the low-pressure chamber under specified operating conditions and in various operating positions. 4. Reversing and Reset Time

The time required from the energization of the electromagnet to the termination of the valve core's reversing action. Reset time refers to the time required from the de-energization of the electromagnet to the valve core returning to its initial position.

5. Reversing Frequency

The maximum number of reversing actions allowed per unit time.

6. Service Life

The service life of a Rexroth solenoid valve is determined by the failure of its main components, resulting in the inability to perform normal reversing and reset actions, or by the significant deterioration of its main performance indicators exceeding the specified number of reversing actions.

Common Rexroth Solenoid Valve Faults

Faults in Rexroth solenoid valves directly affect the operation of switching and regulating valves. Common faults include the solenoid valve not operating. The following troubleshooting steps should be taken:

1. Loose or detached solenoid valve wiring: The solenoid valve will not be energized. Tighten the wiring.

2. Burned-out solenoid valve coil: Disconnect the solenoid valve wiring and measure with a multimeter. If an open circuit is detected, the solenoid valve coil is burnt out. This can be caused by moisture in the coil, leading to poor insulation and magnetic leakage, resulting in excessive current and burnout. Therefore, prevent rainwater from entering the solenoid valve. In addition, an overly stiff spring, excessive reaction force, or too few coil turns resulting in insufficient suction can also cause the coil to burn out. In an emergency, the manual button on the coil can be switched from the normal "0" position to the "1" position to open the valve.

3. Solenoid Valve Jammed: The clearance between the solenoid valve's spool sleeve and valve core is very small (less than 0.008mm), and it is usually assembled as a single piece. When mechanical impurities are introduced or there is insufficient lubricating oil, it is easy to jam. A temporary fix is ​​to insert a steel wire through the small hole at the head to make it spring back. The fundamental solution is to disassemble the solenoid valve, remove the valve core and valve core sleeve, and clean them with CCI4 to ensure the valve core moves freely within the valve sleeve. During disassembly, pay attention to the assembly sequence of each component and the location of external wiring to ensure correct reassembly and wiring. Also check if the oil mist lubricator spray hole is blocked and if there is sufficient lubricating oil.

4. Air Leakage: Air leakage will cause insufficient air pressure, making it difficult for the forced valve to open and close. This is caused by damaged sealing gaskets or worn spool valves, resulting in air leakage between several cavities. When troubleshooting a solenoid valve malfunction in a switching system, choose an appropriate time to address the issue when the valve is de-energized. If the problem cannot be resolved within a single switching interval, suspend the switching system and address the issue at a later time.

Common Applications of Rexroth Solenoid Valves

Rexroth solenoid valves utilize a single solenoid coil. The energized coil generates magnetic attraction, overcoming spring pressure to actuate the valve core. They are simple in structure, inexpensive, and only perform on/off switching.

1. Solenoid Valve: Used for on/off control of liquid and gas pipelines. It is a two-position (DO) control. Generally used for small pipelines.

2. Solenoid Valve: Can only be used for on/off control. It is a DO control and can only be used for small pipelines. Commonly found in pipelines with a diameter of DN50 and below, rarely found in larger DNs.

Differences between Rexroth Electric Valves and Solenoid Valves:

Rexroth solenoid valves utilize a single solenoid coil. The energized coil generates magnetic attraction, overcoming spring pressure to actuate the valve core. They are simple in structure, inexpensive, and only perform on/off switching.

Electric valves use an electric motor to drive the valve stem, which in turn actuates the valve core. Electric valves are further divided into shut-off valves and regulating valves. Shut-off valves operate in two positions, meaning fully open or fully closed. Control valves, on the other hand, have an electric valve positioner installed, using closed-loop regulation to dynamically stabilize the valve in a specific position.

1. On/Off Type:

Rexroth solenoid valves are driven by a coil, only able to open or close, with a short actuation time.

Electric valves are generally driven by a motor, requiring a certain amount of time to complete the opening or closing action, simulating a variable input, and can be used for regulation.

2. Operating Characteristics:

Rexroth solenoid valves generally have a very small flow coefficient and operate with a small pressure difference. For example, the flow coefficient of a 25mm solenoid valve is much smaller than that of a 15mm electric ball valve. Solenoid valves are driven by an electromagnetic coil, making them more susceptible to damage from voltage surges. They function like a switch, with only two actions: opening and closing.

Electric valves are generally driven by a motor, making them more resistant to voltage surges. Solenoid valves open and close quickly, generally used in applications with low flow rates and low pressures, requiring high switching frequencies, while electric valves do the opposite. Electric valves allow for controllable opening, with states of open, closed, and partially open/closed, enabling control of the flow rate of media in pipelines. Solenoid valves cannot achieve this.

Rexroth solenoid valves generally reset upon power failure, while electric valves require a reset device for this function.

3. Applicable Processes:

Solenoid valves are suitable for special process requirements, such as leakage or special fluid media, but are more expensive.

Electric valves are generally used for regulation, but some are used for on/off control, such as in fan coil units.

Rexroth Solenoid Valve Selection Tips

There are many methods for selecting Rexroth solenoid valves, all based on the valve's operating conditions, environment, and customer requirements. Solenoid valves can be classified in many ways, such as by working principle, media properties, environmental operating conditions, and material. Different types of solenoid valves require different selection methods and techniques. Today, Qianqiu Automation, a solenoid valve distributor, will discuss selection techniques for different types of solenoid valves.

I. Selection of Corrosion-Resistant Solenoid Valves Based on Fluid Parameters: Material, Temperature Group

1. Corrosive fluids: Corrosion-resistant solenoid valves and all-stainless steel are recommended; Ultra-clean edible fluids: Food-grade stainless steel solenoid valves are recommended.

2. High-Temperature Fluids: Solenoid valves made with high-temperature resistant electrical and sealing materials should be selected, and piston-type valves are preferred.

3. Fluid State: Fluids can be gaseous, liquid, or mixed, especially when ordering valves with a diameter greater than DN25.

4. Fluid Viscosity: Generally, any fluid can be selected below 50 cSt. If the viscosity exceeds this value, a high-viscosity solenoid valve should be selected.

II. Selection of Gas Solenoid Valves Based on Pipeline Parameters: Nominal Diameter (DN), Connection Type

1. Determine the nominal diameter (DN) based on the inner diameter of the pipeline or the flow rate requirements.

2. Connection type: Generally, flange connections are required for valves > DN50; for valves ≤ DN50, the connection type can be freely selected according to user needs.

III. Water Solenoid Valves: Selection Based on Pressure Parameters: Principle and Structural Types

1. Nominal Pressure: This parameter has the same meaning as other general-purpose valves, determined by the nominal pressure of the pipeline.

2. Working Pressure: If the working pressure is low, a direct-acting or step-direct-acting principle must be selected; when the minimum working pressure difference is above 0.04 MPa, direct-acting, step-direct-acting, and pilot-operated types can all be selected.

IV. Normally Closed Solenoid Valves, Normally Open Solenoid Valves, or Continuously Energized Solenoid Valves

1. If the opening time is short or the opening and closing times are infrequent, a normally closed type should be selected.

2. However, for some safety protection applications, such as furnace and kiln flame monitoring, normally open types cannot be selected; continuously energized types should be chosen.

V. High-Temperature Solenoid Valves: Electrical Selection: Imported solenoid valves should be prioritized for their voltage specifications. 6. Stainless steel solenoid valves should be selected with auxiliary functions according to environmental requirements: explosion-proof, check valve, manual, waterproof mist, water spray, and submersible.

1. Explosive environments: Solenoid valves with the appropriate explosion-proof rating must be selected.

2. When backflow is possible, a solenoid valve with a check valve function can be selected.

3. When manual operation of the solenoid valve is required, a solenoid valve with a manual function can be selected.

4. For outdoor installations or dusty environments, waterproof and dustproof models (protection rating of IP54 or higher) should be selected.

5. Submersible solenoid valves (protection rating of IP68 or higher) must be used for fountains.

6. When the solenoid valve needs to be open for a long time, and the continuous time exceeds the closing time, a normally open type should be selected.

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4WE6FA6X/EG24N9K4 The company mainly deals with European and American brands and can source brands from any European country. For example, our key German brands include: BURKERT, DEMAG, HAWE, REXROTH, HYDAC, PILZ relays, FESTO, IFM sensors, E+H, HEIDENHAIN, P+F sensors, SICK, TURCK, and HIRSCHMANN industrial switches. German brands: Hengstler, Murr, Schmersal, Samson, EPRO (Emerson Group)

American brands: MOOG, ASCO, MAC, NUMATICS, PARKER, VICKERS, ROSS

British brands: Norgren

Italian brands: OMAL, ATOS, CAMOZZI, UNIVER, Camozzi