Rexroth solenoid valve 4WE6U6X/EW220N9K4 in stock.

Brand

REXROTH/German Rexroth

Flow Direction

Other

3C Valve Category

Industry

Application Areas

Petroleum, Mining, Energy, Electrical, General

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 on-site pipeline inner diameter or flow requirements;

2) Connection type: Generally, for DN >50, a flange connection should be selected; for DN ≤50, the connection type 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 duration 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, a continuously energized type cannot be selected.

6. Selection of Auxiliary Functions Based on Environmental Requirements: Explosion-proof, Check Valve, Manual Operation, Water-resistant (fogproof), Water Spray, Submersible.

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 this value is exceeded, for a nominal diameter greater than 15mm, use a multi-functional solenoid valve; for a nominal diameter less than 15mm, use a high-viscosity solenoid valve.

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 selected.

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 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 0.04Mpa, an indirect pilot-operated type can be selected; for a minimum working pressure difference close to or less than zero, a direct-acting or step-by-step direct-acting type 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 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 open and closed positions. 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.

Rexroth Solenoid Valve 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 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 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 Faults of Rexroth Solenoid Valves

A Rexroth solenoid valve consists of an electromagnet and a magnetic core, and is a valve body containing one or more orifices. When the coil is energized or de-energized, the movement of the magnetic core causes fluid to flow through the valve body or be cut off, thereby changing the fluid direction. 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 electromagnet is directly mounted on the valve body, which is enclosed in a sealing tube, forming a simple and compact assembly. In production, we commonly use solenoid valves such as 2-position 3-way, 2-position 4-way, and 2-position 5-way. Let's 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.

A malfunction in a Rexroth solenoid valve will directly affect the operation of switching and regulating valves. Common malfunctions include the solenoid valve not operating. The following troubleshooting steps should be taken:

1. Loose or detached wiring at the solenoid valve connection. If the wire is loose, the solenoid valve will not be energized. Tighten the wire.

2. Burned-out solenoid valve coil. Disconnect the solenoid valve wiring and use a multimeter to measure. If the circuit is open, 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. Additionally, an overly stiff spring, excessive reaction force, or insufficient coil turns 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 lubrication, it can easily become jammed. 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 lubricator spray hole is blocked and if there is sufficient lubrication.

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 gaskets or worn spool sleeves, resulting in air leakage between several cavities. When troubleshooting solenoid valve malfunctions in switching systems, choose an appropriate time to address the issue when the solenoid valve is de-energized. If the problem cannot be resolved within one switching interval, pause the switching system and address the issue at a later time. Common Applications of Rexroth Solenoid Valves

Rexroth solenoid valves use a single solenoid coil. When the coil is energized, the magnetic force attracts the valve core, overcoming the spring pressure. This simple, inexpensive valve only controls on/off operation.

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 pipelines.

Differences between Rexroth Solenoid Valves

Differences between electric valves and solenoid valves:

Rexroth solenoid valves use a single solenoid coil. When the coil is energized, the magnetic force attracts the valve core, overcoming the spring pressure. This simple, inexpensive valve only controls on/off operation.

Electric valves use an electric motor to drive the valve stem, which in turn moves the valve core. Electric valves are further divided into shut-off valves and regulating valves. Shut-off valves are two-position valves (fully open and fully closed). Regulating valves have an electric valve positioner installed, using closed-loop regulation to dynamically stabilize the valve in a specific position.

1. Switching Method:

Rexroth solenoid valves are driven by a coil and can only open or close, with a short switching time.

Electric valves are generally driven by a motor, requiring a certain amount of time to complete the opening or closing action, allowing for analog operation and 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, 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 and are more resistant to voltage surges. Solenoid valves open and close quickly, typically used in applications with low flow rates and low pressures, requiring high switching frequencies, while electric valves do the opposite. The opening degree of an electric valve can be controlled, with states including 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 can generally be reset upon de-energization, 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 on/off control, such as in fan coil unit terminals.

Rexroth Solenoid Valves

Rexroth is committed to providing safe, precise, efficient, and cost-effective drive and control technologies for various machines 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 variety of hydraulic, electronic drive and control, pneumatic, gear, linear drive, and assembly technologies. The company operates in more than 80 countries worldwide, employs more than 37,500 professionals, and achieved global sales of nearly €6.5 billion in 2012.

Rexroth solenoid valves are electromagnetically controlled industrial devices, fundamental components of automation used to control fluids. 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, ensuring both precision and flexibility. There are many types of solenoid valves, each playing a different role in the control system. Common types include check valves, safety valves, directional control valves, and speed control valves.

A Rexroth solenoid valve has a sealed chamber with through-holes at different locations, each connecting to a different oil pipe. Inside the chamber is a piston, flanked by two electromagnets. When the coil of one electromagnet is energized, the valve body is attracted to that side. Controlling the movement of the valve body opens or closes different drain holes. The inlet hole is always open, allowing hydraulic oil to enter different drain pipes. The oil pressure then pushes the piston in the cylinder, which in turn moves the piston rod, which in turn drives the mechanical device. Thus, controlling the flow of current to the electromagnets controls the mechanical movement.

The selection of a Rexroth solenoid valve should first follow four principles in order of priority: safety, reliability, applicability, and economy. Secondly, it should be based on six aspects of the on-site operating conditions (i.e., pipeline parameters, fluid parameters, pressure parameters, electrical parameters, actuation method, and special requirements).

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Our company mainly deals in 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)

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