Medical Proportional Valves for Flow & Pressure

Industrial Proportional Hydraulic Valves

Proportional Solenoid Valves & Controllers

High-Performance Electro-Proportional Valves

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Medical Proportional Valve

WL2832 Medical proportional valve is designed for precise airflow control in medical air management devices. By adjusting the solenoid current, the valve enables smooth and accurate regulation of air pressure and flow. With compact structure, fast response, and stable repeatability, the WL2832 proportional valve is suitable for respiratory equipment, diagnostic systems, and medical automation applications. We provide standard and customized WL2832 proportional valves to support medical device OEMs with consistent performance and reliable manufacturing quality.

Product Overview

Medical Proportional valves are intelligent fluid power components that translate a variable electrical signal into precise, variable hydraulic or pneumatic output. They form the core of modern motion control systems, enabling smoother operation, greater efficiency, and enhanced process control. By offering infinite adjustability of flow and pressure, they bridge the critical gap between basic switching and ultra-high-performance servo technology, making advanced automation accessible for a wide range of industrial and mobile machinery.

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Digital Proportional Valve Systems

Main Features of Medical Proportional Valve

Infinite Positioning: Allows for smooth, stepless control of fluid parameters.

Electro-Proportional Control: Output is directly proportional to an analog electrical input.

Reduced Shock: Enables smooth acceleration and deceleration of actuators, reducing system shock.

Energy Efficiency: Can optimize system energy use by providing only the necessary flow or pressure.

Integrated Electronics (onboard or separate): Simplifies installation and tuning.

Variety of Functions: Available as directional, pressure relief, flow control, or combined function valves.

Compact & Robust Designs: Suitable for harsh industrial and mobile environments.

Smooth Medical Proportional Control valve

Energy-Medical Proportional Valves

Optimize Systems with Proportional Valves

Industrial-Grade Proportional Valve

Brand	Weilong	Model Number	WL 2832
Rated Voltage (V)	DC12V or 24V	Rated Power(W)	4.5W
Work Mode	Air Control Valve	Working Pressure (N)	0.7 Mpa
Air-flow Rate	0-250L/ per 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 600V 50/60Hz 2s	Non-excitation Holding Force	0
Working Temperature	-10°C-100°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

Data Sheet Summary

A typical proportional valve data sheet provides critical specifications:

Valve type (directional, pressure), nominal size (e.g., NG06),

max operating pressure (e.g., 350 bar), rated flow at ΔP (e.g., 40 L/min @ 10 bar),

input signal range (e.g., 0-10V, 4-20mA),

coil resistance, hysteresis (e.g., <3%), repeatability,

response time (e.g., 50 ms),

fluid compatibility, temperature range,

housing material, seal material, mounting interface,

weight, and protection class.

Electrical connection details and required amplifier specifications are also included.

Precision Proportional Valves & Drivers

Proportional valves are crucial in applications requiring smooth, controlled motion or precise pressure regulation. In industrial hydraulics, they control injection molding machines, presses, and steel mill equipment for precise speed and force. Mobile machinery relies on them for the smooth, operator-friendly control of excavator arms, crane movements, and grader blades. Test stands use proportional valves for accurate load simulation and pressure cycling. They are also found in plastic processing (extruder pressure control), marine (steering systems), energy (turbine control), and aerosol simulators. Their ability to replace multiple fixed-flow valves with one infinitely variable unit simplifies systems and enhances controllability across these diverse fields.

Adv. and Disadvantage of Proportional Valve

Advantages:

Enhanced Control: Provides precise, variable control of speed, position, and force, leading to better product quality and process accuracy.

System Simplification: Can often replace complex arrangements of multiple pumps and on/off valves, reducing component count and potential leak points.

Energy Savings: By delivering only the required flow or pressure, they reduce heat generation and pump unloading losses, improving overall system efficiency.

Reduced Shock & Noise: Smooth actuation minimizes pressure spikes, water hammer, and mechanical stress, leading to quieter operation and longer component life.

Flexibility & Programmability: The output can be easily adjusted via the control signal, allowing for flexible machine cycles and easy integration with PLCs.

Cost-Effective Precision: Offers a middle ground between inexpensive on/off valves and high-cost servo valves, providing good precision for many applications.

Disadvantages:

Higher Cost: Significantly more expensive than standard on/off solenoid valves due to complex solenoids and required electronics.

Sensitivity to Contamination: Tight tolerances between spool and sleeve make them more vulnerable to damage from dirty fluid than basic valves. Excellent filtration (often 10µm or finer) is mandatory.

Increased Complexity: Require a compatible electronic driver/amplifier and a clean, stable command signal, adding to system design and maintenance knowledge requirements.

Power Consumption: Typically consume more continuous electrical power than simple on/off solenoids.

Performance Limitations: Compared to high-end servo valves, they generally have higher hysteresis, slower response times, and less precise control, especially under varying loads in open-loop configurations.

Heat Generation: The proportional solenoid and electronics can generate significant heat, which must be managed.

Proportional Valve for Dynamic Control

Q: What's the difference between a proportional valve and a servo valve?

A: Both provide proportional control. Servo valves use a torque motor and flapper-nozzle pilot stage, offering the highest precision and frequency response but are very contamination-sensitive and costly. Proportional valves use a proportional solenoid, are more robust, tolerant of contamination, and cost-effective for most industrial applications.

Q: Is an amplifier always required?

A: Yes. A dedicated amplifier (driver) is almost always required to convert the low-power command signal into the high-power PWM current needed to drive the proportional solenoid correctly.

Q: Can I use a proportional valve with a standard PLC output?

A: Not directly. The PLC’s analog output (0-10V or 4-20mA) can provide the command signal to the valve’s amplifier, but the amplifier itself needs a separate power supply.

Q: What is hysteresis in a proportional valve?

A: Hysteresis is the difference in output (e.g., flow) for the same input signal when the signal is increasing versus when it is decreasing. It’s a measure of lost motion or “slop.” Lower hysteresis means better control accuracy.

Q: How important is filtration?

A: Extremely important. Clean fluid is critical for reliability and longevity. Always follow the manufacturer’s recommendation, often requiring 10-micron or better filtration.

How to Select the Right Medical Proportional Valve

Selecting the correct proportional valve requires a systematic approach. Start by defining the control objective: Do you need to control actuator speed and direction (directional valve), maintain precise system or branch pressure (pressure control valve), or regulate flow independently of pressure (flow control valve)?

Next, gather critical performance data. Determine the maximum flow rate the valve must pass, specifying the associated pressure drop (ΔP) across the valve at that flow, as flow ratings are meaningless without a ΔP. Identify the system’s maximum operating pressure. Consider dynamic requirements like response time (how fast it must react) and static accuracy needs like hysteresis and linearity.

Then, evaluate the application context. Specify the fluid type, viscosity, and operating temperature range for material compatibility. Choose between open-loop (simpler, adequate for many speed control tasks) and closed-loop (with LVDT feedback for superior accuracy in pressure or position control) versions. Ensure you have a compatible electronic amplifier and clean command signal source.

Finally, match physical specifications: the correct mounting interface (e.g., ISO 4401), port sizes, electrical connections, and environmental protection (IP rating). Always remember that a proportional valve is only as reliable as the fluid that powers it; filtration to the manufacturer’s specification (often 10µm or better) is non-negotiable for long service life. Consulting with a technical specialist during selection is highly recommended.