IL100-N03-L: Booster Relay, Expert in Accelerating Long-Distance, Large-Capacity Pneumatic Systems

Product Positioning
The IL100-N03-L is a Booster Relay from SMC’s IL100 series, a type of pneumatic signal amplification component. It is specifically designed to solve the problem of slow response in pneumatic actuators (such as cylinders) caused by excessively long piping between measuring devices and operating parts, or by the large internal volume of the operating parts. By converting a weak input signal pressure into an output with the same proportional pressure but amplified flow, it significantly increases the driving speed of the operating part. It is an indispensable core component in process control, large valve actuation, and long-distance pneumatic control systems.

Core Highlights: Flow Amplification, 1:1 Ratio, Low-Temperature Adaptability

• Flow Amplification, Speed Multiplication: As a relay, its core function is to receive a low-flow input signal and output a high-flow air source at the same pressure to directly drive the actuator. This significantly shortens the charging time for large actuators or long piping, greatly increasing the operating speed of the driven part.
• 1:1 Pressure Follow-up, High-Precision Control: The input pressure has a 1:1 ratio with the output pressure, meaning the output pressure precisely follows changes in the input pressure. Furthermore, the product boasts excellent linearity (within ±1%) and low hysteresis (within 1%), ensuring control accuracy and stability.
• Low-Temperature Design, Adapts to Harsh Environments: The suffix “-L” in the model number indicates a low-temperature specification, allowing stable operation in低温 environments down to -30～60°C. This makes it particularly suitable for applications in cold storage, outdoor equipment in cold regions, or processes requiring cooling of process gases.
• NPT 3/8 Port, Standard Connection: The thread type is NPT (National Pipe Thread, Taper), and the connection size is 3/8 inch, conforming to North American and international standards, facilitating compatibility with existing piping systems.
• Built-in Needle Valve, Adjustable Stability: An internal throttling needle valve connects the input and output sides. Adjusting this valve optimizes the stability of closed-loop control systems including the booster relay, preventing oscillation.

Model Number Breakdown

Specifications Overview

Structure and Working Principle
A booster relay is essentially a high-precision flow amplifier with a pilot function. Its internal structure includes diaphragms, a spool, and a throttling needle valve.

• Working Process: A low-flow input pressure from a positioner or valve controller enters the input chamber and acts on diaphragm A. This force counteracts the force from diaphragm B, which is generated by the output pressure.
• Charging Action: When the force generated by the input is greater, the internal supply valve opens, directing a high-flow main air source directly to the output port to rapidly drive the actuator.
• Exhaust Action: When the input pressure decreases, the diaphragm assembly moves upward, closing the supply valve and opening the exhaust port, releasing pressure from the output side to the atmosphere, causing the actuator to move in reverse.
• Balanced State: Through the continuous balancing action of diaphragms A and B, the system maintains dynamic equilibrium, ensuring the output pressure always precisely follows input pressure changes. The built-in needle valve adjusts the system’s response characteristics to prevent oscillation.

Applicable Scenarios

• Long-Distance Pneumatic Control: When the air tubes between the control room and field valves/cylinders are very long, causing significant signal lag, installing a booster relay at the end dramatically improves response speed.
• Large-Volume Actuator Drive: Driving actuators requiring large flow media, such as large diaphragm heads or large cylinders, ensuring rapid action.
• Process Automation Systems: As an auxiliary component for pneumatic valve positioners to quickly and precisely control valve opening/closing.
• Low-Temperature Industrial Applications: Suitable for cold storage, outdoor equipment in cold regions, cold chain logistics, and other situations requiring stable operation in低温 environments.
• Replacement for Large Pilot Valves: Serves as a compact flow amplification solution in applications requiring large flow but with limited space.

Summary: The Acceleration Engine for Long-Distance, Large-Capacity Pneumatic Systems
The IL100-N03-L booster relay, with its three core technical advantages—1:1 high-precision pressure follow-up, high-flow fast response, and低温environmental adaptability—perfectly solves the bottleneck of “slow signal response and slow actuator action” in process control and long-distance pneumatic systems. Its standard NPT 3/8 port ensures compatibility with existing systems, and the built-in needle valve offers flexibility for system optimization. Choosing the IL100-N03-L means equipping your long-distance or large-capacity pneumatic system with a “power engine” that accelerates response, ensures precise control, and adapts to低温environments—an ideal choice for improving process control efficiency and system stability.