Electronic Proportional Valve for Process Automation

Electronic Proportional Valve for Pressure Regulation

Electronic Proportional Valve for Hydraulic Machinery

Electronic Proportional Valve for Pressure Control

Electronic Proportional Valve for Automated Equipment

Electronic Proportional Valve for Energy Efficient Control

Showing Slide 1 of 6

WL4402 Electronic Proportional Valve for Pneumatic Applications

An electronic proportional valve is a sophisticated fluid control device which converts electronic signals into continuously adjustable flow, pressure or direction control. It allows providing intermediate output values in order that industrial devices could operate smoother and more accurately, unlike traditional on/off valves. Electronic proportional valves may be integrated with PLCs, motion controllers, sensors and other automation systems. The valve may be configured to receive voltage or current control signals for controlling a solenoid, spool, poppet or another mechanism. Applications include hydraulic machines, pneumatic systems, factory automation, process control, robots, material handling and precision machining. Proper selection depends on flow rate, pressure, fluid compatibility, electrical signal, response time, mounting and other factors. Properly selected, installed and calibrated electronic proportional valves improve productivity and repeatability of industrial equipment.

Get A Free Quote

PDF Download

Electronic Proportional Valve Description

What is an electronic proportional valve?

An electronic proportional valve is a fluid control device which regulates flow, pressure or fluid direction continuously by means of an electrical input signal. Instead of just switching between open and closed state, it can be set to operate at any of intermediate positions. The controller sends the variable voltage or current signal to the electronic actuator or proportional solenoid of the valve. The force then moves an internal spool or control element, and so the fluid passage is changed and the system output is controlled. Electronic proportional valves can be combined with sensors and feedback controllers for increased accuracy. They are widely used in hydraulic, pneumatic, industrial automation, process-control and precision machinery applications where smooth and adjustable control of fluids is required.

How does a electronic proportional valve function?

An electronic proportional valve converts the electrical control signal into a controlled mechanical movement .

Step 1: Electrical Order
The PLC, controller or automation system generates a variable electrical signal, usually a voltage or current signal.

Step 2 – Electronic Triggering
The signal is transmitted to the valve proportional solenoid or electronic actuator. The actuator generates a force proportional to the input signal given to it.

Step 3 — Valve Element Travel
The resulting force moves the internal spool, poppet or other regulating element.

Step 4 — Fluid Control
The amount of fluid flowing through the valve changes depending on the valve position. Depending on the valve design, it will regulate the flow, pressure or direction.

Step 5 — System Answer
This controlled fluid output controls an actuator or affects the process. Thus, the system can change speed, force, pressure or position.

Step 6 – Feedback
There are sensors for measuring pressure, flow or position for applications requiring high accuracy. The controller compares the desired value with the actual value and regulates the valve signal.

Basic principle:
Electrical Signal Electronic Actuator Valve Position Fluid Output System Response

Electronic Proportional Valve Video

Electronic Proportional Valve Detail Display

Electronic Proportional Valve for Smart Fluid Control

Electronic Proportional Valve for Precise Flow Control

Electronic Proportional Valve Buyer Guide for Industry

Electronic Proportional Valve Supplier Selection Guide

Electronic Proportional Valve for Precision Applications

Electronic Proportional Valve Performance Guide

Electronic Proportional Valve Data Sheet

Brand	Weilong	Model Number	WL 4402
Rated Voltage (V)	DC12V or 24V	Rated Power (W)	7.2W
Work Mode	Air Control Valve	Working Pressure (MPa)	0.2 MPa
Airflow Rate	0 L/minute	Reset Time(s)	1 S On, 1S Off
Service Life	200 Thousand Times	Certification	CE, ROHS, ISO9001,
Material	Superior Magnet Iron	Lead Wire Length (mm)	200 MM
Install Style	Screw	Tolerance of Dimension	± 0.1 MM
Water-proof	None	Insulation Class	B
Hi-Pot Test	AC 750V 50/60Hz 2s	Non-excitation Holding Force	0
Working Temperature	-10°C-90°C	Duty Cycle	1-100%
Thread Depth (mm)	/	Payment Term	TT, or LC at Sight
Sample Order	Yes.	Warranty	1 Year
MOQ	1000 pcs	Supply Ability	5000 pcs per week
Delivery Time	30 Days	Port of Loading	Shenzhen

Why are the electronic proportional valves so popular?

With the development of the industrial machinery towards automation, precision control, feedback and energy-saving operation, the electronic proportional valves have become increasingly popular.

Traditional on/off valves are quite appropriate for switching applications, but they do not offer continuously adjustable control. Electronic proportional valves allow varying the output according to the electrical command. In this way, a gradual adjustment of flow, pressure, force, speed and motion can be provided.

Another reason for popularity is compatibility with modern automation systems. The electronic proportional valves are compatible with PLCs, sensors, motion controllers and industrial control architecture. This allows using them for automated manufacturing and intelligent production equipment.

Moreover, these valves can make the process more consistent. The controller will automatically adjust the valve output according to changing operating conditions without manual adjustments.

Additionally, the valve helps to save energy. The system will adjust the fluid output according to the real needs and avoid unnecessary flow and pressure loss.

Advances in electronics, the compactness of the valves, feedback technology and digital control help the valves to find wide applications in modern industry.

Electronic Proportional Valve Applications

In industrial systems that require continuously adjustable control of fluids, electronic proportional valves are widely used.

Hydraulic Machines

These valves are used to control speed, pressure, force and motion of actuators in hydraulic presses, injection molding machines, construction equipment, lifting systems and industrial machines .

Automation Factory

These valves are used for controlling pneumatic or hydraulic actuators in automated production lines, assembly machines, packaging equipment and machine tools.

Process Automation

These valves are used for precise flow and pressure control in fluid processing, cooling systems, water treatment and manufacturing processes.

Robotics

If continuously variable output is needed, then proportional valves are used to control pneumatically or hydraulically actuated force and motion in robot systems.

Material Handling

These valves can control mechanisms for lifting, clamping, positioning and conveyors reducing mechanical shock and sudden movements.

Precision Instrumentation

Accurate proportional fluid control will improve CNC machines, test equipment, laboratory systems, as well as specialized production equipment.

Energy & Environmental Equipment

These valves can be used in cooling, heating, fluid processing and energy management systems, where there is a need for adjustable fluid control.

These valves can be used with electronic controllers and feedback sensors; therefore, they are quite useful in automated equipment where precise fluid control is required.

Electronic Proportional Valve Adv. & Disadv

Electronic Proportional Valves: Benefits and Drawbacks

Benefits

Precise Control

Electronic proportional valves provide the opportunity for continuous control of flow, pressure or direction.

Smooth Operation

Valve gradual adjustment reduces pressure shock, vibration and sudden actuator motion.

Automation Integration

These valves are compatible with PLCs, sensors, motion controllers and industrial automation systems.

Flexible Control

The output can be adjusted electronically according to the requirements of the machine or sensor feedback.

Increased Efficiency

Proper fluid regulation will allow saving the unnecessary fluid flow and energy losses.

Repeatable Performance

Electronic control will ensure repeatable operation during machine cycles.

Drawbacks

Higher Initial Cost

Electronic proportional valves are more expensive than conventional on/off valves, because of precise components and electronics.

Increased System Complexity

They may require controllers, sensors, wiring, calibration and tuning of the parameters.

Sensitivity to Contaminants

Contaminated hydraulic or pneumatic fluid may cause internal parts binding or wearing.

Proper Setup Required

Improper scaling of signals, calibration or controller tuning can reduce accuracy.

Electricity Dependence

The valve requires sufficient electrical power and control signals.

Maintenance Required

Precision components and electronic controls require proper maintenance and troubleshooting.

Troubleshooting of Electronic Proportional Valves

Troubleshooting of the electronic proportional valve starts from the electrical control system, fluid circuit, valve condition and operating parameters.

Valve Doesn’t React

Check the power supply, wiring, connectors, controller output and input signal. Ensure that the valve receives the correct voltage or current signal.

Incorrect Flow or Pressure

Check valve size. Check system pressure. Check flow settings and signal scaling. Check that the controller sends the correct command.

Unstable Operation

Check sensor feedback, electrical signal interference, controller tuning and fluid contamination. Incorrect control gain can also cause oscillations.

Slow Response Time

Check input signal, controller settings, fluid viscosity, filter condition and system restrictions. High fluid viscosity and a clogged filter can cause slow response.

Valves Sticking

Check fluid cleanliness and filtration. Contaminants can prevent movement of the spool or poppet.

Losses

Check the condition of seals, fittings, mounting surfaces and internal parts. Repair damaged seals or loose connections.

Overheating

Check excessive pressure drop, coil current, supply voltage, fluid temperature and cooling condition.

Low Accuracy

Check calibration, sensor performance, signal range, valve size and controller parameters.

Before starting the repair, disconnect the electrical power and hydraulic or pneumatic pressure if necessary. Follow the manufacturer’s instructions and safety guidelines when inspecting and repairing the valve.

FAQ

1. What is an electronic proportional valve?

An electronic proportional valve is a valve which controls flow, pressure or direction of the medium by means of an electrical control signal. It differs from a simple on-off valve in its ability to work at various positions.

2. What is the principle of operation?

The valve is provided with a variable electrical signal from a PLC, control system or controller. The proportional solenoid acts on the control signal and creates mechanical force, moving the valve’s internal spool or regulator. The position of the spool determines the valve’s flow or pressure.

3. What are the possible control signals?

Industrial standards include 0-10V, ±10V and 4-20mA. The correct control signal will depend on your PLC and valve model. Always look at the electrical characteristics of the valve prior to connecting it to a control system.

4. For what purposes are the electronic proportional valves used?

These valves are extensively used in hydraulics and pneumatics, automation and robotics, injection molding equipment, presses and material handling systems, process control equipment, machine tools and other various variable control applications.

5. What is the difference between a solenoid valve and an electronic proportional valve?

While a solenoid valve allows only on/off action, an electronic proportional valve provides continuous modulation of the flow, pressure or direction of the medium.

6. Choosing the right electronic proportional valve?

Consider all the factors including flow rate, operating pressure, media type, temperature, port size, control signal, response time, mounting configuration, environmental conditions and feedback possibilities. Proper sizing of the valve is especially important.

7. How can an electronic proportional valve operate inaccurately?

Inaccurate operation could be caused by an inappropriate control signal, improper calibration, incorrect controller settings, dirty fluid, lack of proper filtering, sensors’ faults, electrical noise, inappropriate valve sizing or mechanical wear. Checking both the electrical and fluid circuits will allow to find out the problem.

8. How do I service an electronic proportional valve?

Keep the working fluid clean and properly filtered. Check regularly the electrical connections and pressure and temperature monitoring. Check periodically leakage and calibrate the valve. Follow the maintenance recommendations of the manufacturer to extend the service life of the valve.

How to Choose an Electronic Proportional Valve

To select an electronic proportional valve, it is necessary to consider mechanical, hydraulic or pneumatic, electrical and control characteristics.

1.Define the Control Function

Decide whether the valve will regulate flow, pressure, direction or actuator motion. The desired function will determine the valve configuration.

2.Required Flow Calculation

Specify minimum, normal and maximum flow requirements. Do not oversize the valve. If the valve capacity is too high, the control resolution will be poor at low flow rates.

3.Check the operating pressure

Compare the normal and maximum system pressure with the pressure rating of the valve. Dynamic changes in the pressure and operating conditions should be taken into account with a sufficient safety margin.

4.Fluid Compatibility Confirmed

Identify the medium, viscosity, temperature, cleanliness and chemical properties. The body material and seals of the valve must be compatible with the fluid.

5.Match The Electric Signal

Ensure that the valve is compatible with the output of the controller. Common ranges of industrial signals are 0 to 10 V, ±10 V and 4 to 20 mA. Also, check wiring, connector type, current and supply voltage.

6.Assessment of Response Characteristics

Check response time, hysteresis, repeatability, linearity and resolution. Quick response valves are especially important for dynamic machinery and motion control applications.

7.Physical Installation Inspection

Check port size, mounting pattern, connection type, dimensions, flow direction, and installation space availability.

8.Consider the environmental conditions

Evaluate the temperature, humidity, vibrations, dust, moisture and other factors. Select appropriate protection and materials for the installation site.

9.Feedback Requirements Definition

In case of high-accuracy applications, it may be necessary to monitor pressure, flow or position. Check if the valve has its own feedback or if it should be provided separately.

10.Calculating the Total Cost

Consider not only the cost of the purchase, but also the installation, controller requirements, maintenance, energy consumption, spare parts, calibration and service life.

The electronic proportional valve must be properly selected in order to guarantee the required control range and compatibility with the entire industrial system.