Rexroth solenoid valve 4WE6HA6X/EG24N9K4 in stock.

Brand

REXROTH/German Rexroth

Flow Direction

Other

3C Valve Category

Industry

Application Areas

Chemical, Petroleum, Mining, Road/Rail/Marine, Comprehensive

Rexroth Solenoid Valve Selection should first follow four principles in order: safety, reliability, applicability, and economy. Secondly, it should be selected based on six aspects of the on-site working conditions (i.e., pipeline parameters, fluid parameters, pressure parameters, electrical parameters, actuation method, and special requirements).

Rexroth Solenoid Valve Selection Basis:

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

1) Determine the nominal diameter (DN) according to the on-site pipeline inner diameter or flow requirement;

2) 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; when the minimum working pressure difference is 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

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. For neutral media, solenoid valves with copper alloy valve bodies are also recommended; otherwise, rust particles will often fall from the valve body, especially in applications with infrequent operation. 1. Copper cannot be used for ammonia valves.

2. Explosive environments: Products with the appropriate explosion-proof rating must be selected. For outdoor installations or dusty environments, waterproof and dustproof models should be selected.

3. The nominal pressure of the solenoid valve should exceed the maximum working pressure in 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 usually below 50 cSt. If it exceeds this value, a multi-functional solenoid valve should be used when the pipe diameter is greater than 15 mm; a high-viscosity solenoid valve should be used when the pipe diameter is less than 15 mm.

4) When the media cleanliness 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 selected.

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

6) The media temperature should be selected 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, or select the same as the pipeline inner diameter;

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

3. Environmental Conditions

1) The maximum and minimum ambient temperatures should be within the allowable range;

2) In environments with high relative humidity or water droplets/rain, a waterproof solenoid valve should be selected;

3) In environments with frequent vibration, bumps, and impacts, a special type should be selected, such as a marine solenoid valve;

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

5) If space is limited, a multi-functional solenoid valve should be selected, as it eliminates the need for a bypass and three manual valves and facilitates online maintenance. 4. Power Supply Requirements

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

2) Prioritize AC220V or DC24V voltage specifications.

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) Select the rated current and power consumption according to the power supply capacity. Note that AC has a higher VA value during startup; if the capacity is insufficient, indirect-acting solenoid valves should be preferred.

5. Control Accuracy

1) Ordinary solenoid valves only have open and closed positions. For high control accuracy and stable parameters, multi-position solenoid valves should be selected.

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 levels. Performance Requirements (Folded)

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 caused by fluid flowing 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 energizing the solenoid to the termination of valve spool reversal; the reset time is the time required from de-energizing the solenoid to the valve spool returning to its initial position.

5. Reversing Frequency

The maximum number of reversing cycles allowed per unit time.

6. Service Life

The service life of a solenoid valve is limited until major components are damaged, preventing normal reversing and reset actions, or until its main performance indicators significantly deteriorate beyond the specified number of reversing cycles.

Common Rexroth Solenoid Valve Faults

A Rexroth solenoid valve consists of a solenoid coil and a magnetic core, and is a valve body containing one or more orifices. When the coil is energized or de-energized, the rotation of the magnetic core causes fluid to flow through the valve body or be cut off, thereby changing the direction of fluid flow. The electromagnetic components of the solenoid valve consist of a fixed iron core, a moving iron core, and a coil; the valve body consists of a spool, a spool sleeve, and a spring base. The solenoid coil is directly mounted on the valve body, which is enclosed in a sealing tube, forming a simple and compact assembly. Commonly used solenoid valves in production include 2-position 3-way, 2-position 4-way, and 2-position 5-way valves. Here, we'll first explain the meaning of "2-position": for a solenoid valve, it means energized and de-energized; for the valve it controls, it means open and closed.

Faults in Rexroth solenoid valves directly affect the operation of switching and regulating valves. A common fault is that the solenoid valve does not operate. The following troubleshooting steps should be taken:

1. Loose or disconnected solenoid valve wiring. If the solenoid valve is not energized, tighten the wiring. 2. If the solenoid valve coil is burnt out, disconnect the solenoid valve wiring and use a multimeter to measure. If an open circuit is found, the solenoid valve coil is burnt out. Causes include moisture in the coil causing poor insulation and magnetic leakage, resulting in excessive current and burnout. Therefore, prevent rainwater from entering the solenoid valve. Additionally, an overly stiff spring, excessive reaction force, or too few coil turns and 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. If the solenoid valve is stuck: The clearance between the solenoid valve spool and the valve core is very small (less than 0.008mm), and they are usually assembled as a single piece. When mechanical impurities are introduced or there is insufficient lubrication, it is easy for the valve to get stuck. 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. When disassembling, 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 nozzle is clogged and if the lubricating oil is sufficient.

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

Common Applications of Rexroth Solenoid Valves

Rexroth solenoid valves use a single solenoid coil to generate magnetic attraction that overcomes spring pressure, actuating the valve core. They are simple in structure, inexpensive, and only perform on/off control.

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 as an on/off quantity, it is a DO control and can only be used for small pipelines. Commonly found in pipelines of DN50 and below, rarely found in larger pipelines.

Differences between Rexroth Solenoid Valves

Differences between Electric Valves and Solenoid Valves:

A solenoid valve uses an electromagnetic coil to generate magnetic attraction, overcoming spring pressure to actuate the valve core. It consists of only one electromagnetic coil, has a simple structure, is inexpensive, and can only perform on/off operations.

An electric valve uses 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 (fully open and fully closed), while regulating valves have an electric valve positioner installed, using closed-loop regulation to dynamically stabilize the valve in a specific position.

1. On/Off Type:

Solenoid valves are driven by a coil and can only open or close, with a short on/off time.

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

2. Operating Characteristics:

Solenoid valves generally have a very small flow coefficient and a small working 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 and are more susceptible to damage from voltage surges. Essentially, it functions like a switch, with two actions: opening and closing.

Electric valves are generally driven by a motor, making them more resistant to voltage surges. Solenoid valves are quick-opening and quick-closing, typically used for low flow rates and low pressures, requiring high switching frequencies. Electric valves, on the other hand, are less efficient. The opening degree of an electric valve can be controlled, with states of open, closed, and partially open/closed, allowing control of the flow rate of the medium in the pipeline, a requirement that solenoid valves cannot meet.

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 some special process requirements, such as leakage or special fluid media, but they are more expensive.

Electric valves are generally used for regulation, but some are used for switching, such as in fan coil unit terminals.

I: Corrosion-Resistant Solenoid Valves Selection of 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: Select solenoid valves made with high-temperature resistant electrical and sealing materials, and choose piston-type valves.

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

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.

II: Gas solenoid valve selection 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. Connection type: Generally, for valves >DN50, a flange connection should be selected; for valves ≤DN50, the connection type can be freely selected according to user needs.

III: Water solenoid valve selection 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 type 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 time is 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: Electrical Selection for High-Temperature Solenoid Valves: Imported solenoid valves should be preferred for their voltage specifications.

VI: Auxiliary Functions of Stainless Steel Solenoid Valves Selected Based on Environmental Requirements: Explosion-proof, Check Valve, Manual, Water-resistant (fog-proof), Water Spray, Submersible

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

2. When there is backflow in the pipe, a solenoid valve with a check function can be selected.

3. When manual operation of the solenoid valve is required on-site, a solenoid valve with 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. For fountains, submersible solenoid valves (protection rating of IP68 or higher) must be used.

6. 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.

Rexroth Solenoid Valves

Rexroth solenoid valves are electromagnetically controlled industrial devices, fundamental components for fluid control in automation. They are actuators, not limited to hydraulic or pneumatic systems. They are 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, while ensuring control accuracy and flexibility. There are many types of solenoid valves, each playing a different role in the control system. Commonly used types include check valves, safety valves, directional control valves, and speed control valves.

Rexroth is committed to providing safe, precise, efficient, and cost-effective drive and control technologies for various machinery and systems. The company integrates global application experience to develop innovative products, providing customized 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:

Rexroth 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.

Renewable Energy:

Wind Energy

Product Groups

Drive Technology, Electronic Drive & Control Technology, Casting Technology, Gear Technology, Industrial Hydraulics, Linear Drive Technology, Travel Hydraulics, Assembly Technology, Pneumatics, Tightening & Welding Technology

Rexroth's Strong Sales Channels

As the Rexroth brand gains increasing recognition in China, many domestic trading companies have begun importing Rexroth products through overseas channels.

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Our company mainly deals in European and American brands and can source brands from any European country. For example, our advantageous 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