Proportional Flow Control Valve

Proportional Flow Control Valve

  • Proportional solenoid valve:
    The proportional flow control solenoid valve converts the input current signal into a mechanical signal output, and then controls the flow. This type of proportional valve has fast response time, compact in size, and is suitable for installation on manifolds. Available flow ranges are 0-32L/min, 0-140L/min, 0-300L/min.

  • Stepper-controlled proportional valve for air and liquid:
    KaoLu stepper-motor driven proportional valves control flow ranging from 0 to 20 LPM, 120 LPM, 300 LPM and up to 1000 LPM. Our stepper-motor driven proportional valves are ideal for controlling a variety of media such as water, gas, oil, etc. KaoLu stepper-motor driven flow proportional valves also have the advantages of low hysteresis (<2%) and high resolution (20ml/min).
Stepper-Controlled Proportional Valve 0-65L/min

Stepper-Controlled Proportional Valve 0-65L/min

FC series proportional liquid and gas flow control valve provides high precision flow control of liquid and gas.

Repeatability can reach as high as 0.1% F.S with extremely low hysteresis. FC20 series proportional needle valve can reach flow rate up to 65 L/min (2.3 SCFM) at 87 psig inlet pressure.

This valve is used for dosing, that can dispense as low as 1 mL of water. Takes 0-10V, 4-20mA or RS85 signal to change orifice. All models can customize wet material to stainless steel, consult a factory for customization.

Stepper-Controlled Proportional Valve 0-230L/min

Stepper-Controlled Proportional Valve 0-230L/min

FC series proportional flow control valve provides high precision flow control of liquid and gas.

Repeatability can reach as high as 0.1% F.S with extremely low hysteresis. FC120 series proportional needle valve can reach flow rate up to 230 L/min (8.1 SCFM) at 87 psig inlet pressure.

FC120 series precision flow control valve can reach a life time of 10 million cycles of full open to full closure. Takes 0-10V, 4-20mA or RS85 signal to change orifice.

Stepper-Controlled Proportional Valve 0-400L/min

Stepper-Controlled Proportional Valve 0-400L/min

The valve provides high precision flow control of liquid and gas.

Repeatability can reach as high as 0.1% F.S with extremely low hysteresis. FC300 series proportional needle valve can reach flow rate up to 400 L/min (14.2 SCFM) at 87 psig inlet pressure.

Takes 0-10V, 4-20mA or RS85 signal to change orifice. All models can customize wet material to stainless steel, consult factory for customization.

Stepper-Controlled Proportional Valve 0-1200L/min

Stepper-Controlled Proportional Valve 0-1200L/min

FC series proportional water and gas flow control valve provides high precision flow control of liquid and gas Repeatability can reach as high as 0.1% F.S with extremely low hysteresis.

FC1500 series proportional needle valve can reach flow rate up to 3000 L/min (106 SCFM) at 150 psig inlet pressure. Turndown ratio can reach up to 1: 400. Selection of flow sensors available for feedback signal.

FC20 series proportional control water flow valve is used for dosing, that can dispense as low as 1 mL of water. FC120 series valve can reach a life time of 10 million cycles of full open to full closure.

Takes 0-10V, 4-20mA or RS85 signal to change orifice. All models can customize wet material to stainless steel, consult factory for customization.

Electronic Flow Control Valve 0-2100L/min

Electronic Flow Control Valve 0-2100L/min

Electronic flow control valve (EFC) is used to regulator flow rate of liquid or gas. The FC series electronic flow regulator has the advantage of high flow (106 scfm), high repeatability ( 0.1% F.S), high turn down ratio (1:400)

This electronic air flow control valve can be used in pair with a flow sensor for feedback control to achieve extremely high flow rate control precision. FC series valve is driven by PM series driver.

The driver provides micro-stepping resolution to the valve to achieve accurate flow control. The driver accepts 0-10V, 4-20mA or RS85 signal. All models can customize wet material to stainless steel, consult factory for customization.

Stepper-Controlled Proportional Valve 0-5000L/min

Stepper-Controlled Proportional Valve 0-5000L/min

The type of valve is mainly designed for providing high precision flow control of liquid and gas.

Repeatability can reach as high as 0.1% F.S with extremely low hysteresis. FC3000 series proportional needle flow control valve can reach flow rate up to 5000 L/min (176.6 SCFM) at 145 psig inlet pressure.

Selection of flow sensors available for feedback signal. Takes 0-10V, 4-20mA or RS85 signal to change orifice. All models can customize wet material to stainless steel, consult factory for customization.

Proportional Solenoid Valve 0-310L/min

Proportional Solenoid Valve 0-310L/min

KLPV-HP valve has the feature of high flow rate up to 310 L/min and working pressure between 0-20 barg.

It is capable of repeatable tuning of air flow rate with quick response time. It is compact, light, that is suitable for applications such as medical ventilator, anesthesia, gas blending...etc.

KaoLu is proud to offer stable proportional solenoid valve to some medical ventilator and anesthesia equipment manufacturers around the world.

MEMS Gas Mass Flow Meter 0-1000L/min

MEMS Gas Mass Flow Meter 0-1000L/min

KMF1000 series digital gas mass flow meter is made of micro- electromechanical system (MEMS) flow sensing chip, suitable for a variety of purposes of clean, relatively dry nature of the small flow gas measurement and process control, unique packaging technology makes the product to meet the different ranges of flow measurement, to ensure high sensitivity, high reliability, high stability and low cost.

Product Description

Proportional Flow Control Valve Applications

This type of valve is widely used in industrial applications. The proportional flow control valve pneumatic has a wide application in manufacturing industries like gas-control welding equipment, laser machines, gas mixing, painting/spray equipment, semiconductor equipment, analytical equipment. Moreover, a huge use of air flow control valve can be observed in medical tools such as anesthesia equipment, nebulizer, respiration measurement, ventilation equipment, etc.


Introducing latest Stepper-Controlled Proportional Flow Control Valve


What is a Stepper Motor?

Stepper motors are brushless DC motors that rotate in steps electronically set by a controller or drive. Stepper motors are ideal for applications that require speed and precise position control, especially at low speeds such as in automation, motion systems, and 3D printers. Due to their internal design which minimizes mechanical and electrical "delays" that occur in other motors, stepper motors have remarkable stopping accuracy and responsiveness. Often, this makes stepper motors an ideal choice for synchronous and high precision operations.


Energizing the coils of a stepper motor in the right sequence to achieve a single step is a complex task. KaoLu provides a PM series stepper motor controller that allows you to solve this task. There are two types of stepper motor drives—constant voltage (L/R drive) and constant current (chopper drive). If you're interested in learning more, please refer to our News section.


Drivers simplify the operation of a stepper motor by interpreting a digital step and direction signal from a controller and energizing the motor coils accordingly. All electronics are governed by Ohm's Law and the relationship between current rise and inductance. With stepper motors, the motor's design (in regard to its coils) prevents current from increasing quickly during pulses (command signals), which means the current can never reach its peak value without very high voltage. This is a problem because without sufficient current, the torque will be low, especially at high motor speeds. To combat this, chopper drives perform what is known as Pulse Width Modulation (PWM).



KaoLu's FC series proportional control valve utilizes an ultra fine thread, which is smooth, proportional, accurate, and stays in the position with high torque.

Now, couple that with a stepper motor that gives you precision, speed, and is ultimately automated with any bipolar chopper drive you wish to use.


Anywhere there is a needle valve that is controlling the flow of gas, can now be remotely located, automated, monitored and automatically adjusted to meet whatever demand you have in your application. Four of the main advantages of this our proportional flow control valve; System Integration, Very Low Hysteresis, Low Power consumption, & Specific Flow Curve capabilities exceeding 1000 LPM. Please visit our video for a demo: GennDih Enterprise. Co. Ltd