2L Series Pilot-Operated Normally Closed Type

Beyond the "Switch": Why the AirTAC 2L Series is the Ultimate Defense for High-Temp Fluids

AirTAC 2L Series Stainless Steel Solenoid Valve Overview

In industrial fluid control, engineers face an enemy far harsher than the "complexity" of pneumatics: media aggression. Standard brass valves often crumble under the assault of saturated steam or high-temperature cooling loops. When a valve seal cracks at 120°C, it's not just a leak—it's unscheduled downtime and a serious safety hazard.

The AirTAC 2L Series (Pilot-Operated, Normally Closed) is not a generic "all-purpose" valve; it is an expert-level heavy weapon engineered specifically for 180°C+ environments. By leveraging fluid dynamics to control massive flow with minimal electrical power, it serves as the definitive guardian of your factory's thermal arteries.

Pilot-Operated Efficiency: Uses the system's own pressure to actuate a massive 50mm (2-inch) orifice with a tiny, cool-running coil.
High-Temperature Mastery: Rated for saturated steam up to 183°C (361°F) and hot process water.
Triple-Armor Build: Combines a SUS304 Stainless Steel body, PTFE (Teflon) seals, and a Class H insulation coil.
Fail-Safe NC Design: Automatically shuts down flow during power loss, providing critical protection for high-stakes media.
Massive Scalability: Ranges from 1/2" (Cv 5.50) to a behemoth 2" (Cv 49.00) flow path.

1. The 0.05 MPa "Lever": The Genius of Pilot Design

The "Pilot-Operated" architecture is the secret behind the 2L's high flow. Instead of requiring a massive, power-hungry solenoid to pull open a heavy seal directly, the 2L uses a clever "two-stage amplification" principle:

Stage 1 (The Pilot): When energized, the coil opens a tiny microscopic channel.

Stage 2 (Pressure Shift): High-pressure media from the inlet flows into the chamber above the main piston and is instantly vented, creating a pressure vacuum.

Stage 3 (The Lift): The full force of the inlet pressure now "brute-forces" the heavy piston upwards, opening the main valve effortlessly.

⚠️ THE MOPD REQUIREMENT: Because the valve uses system pressure as its "fuel" to move the piston, it requires a Minimum Operating Pressure Differential (MOPD) of 0.05 MPa (7.25 psi). If you attempt to use this to drain a gravity-fed tank at zero pressure, the pilot will click, but the main valve will never open.

2. "Triple Armor" Material Science

The 2L is specifically designated for "High Temperature Water and Saturated Steam" due to its environmental shielding:

SUS304 Structural Defense

Unlike cast iron or brass, the SUS304 body prevents corrosion and rust-flake contamination, maintaining a clean fluid foundation for steam lines.

PTFE "Iron Shirt"

While Viton fails in steam, PTFE (Teflon) is chemically inert and handles up to 260°C, providing a massive safety margin for 183°C steam apps.

Class H Coil Integrity

Rated for 180°C internal heat, the Class H coil prevents burnout caused by heat conducting upward from the steam-filled valve body.

3. From Machine Cooling to Factory Arteries

The 2L Series offers a scalable platform tailored to your specific volumetric needs:

The Workhorses (1/2" ~ 1")

Models like the 2L150 (Cv 5.5) are the standard for machine tool coolant lines and high-output industrial humidifiers.

The Behemoth (2")

The 2L500-50 (Cv 49.0) can dump nearly 500 liters of water per minute, engineered for factory main cooling loops and auxiliary fire supplies.

Technical Troubleshooting FAQ

1. "I installed a 2L320 but it won't open. Is it broken?"

Check your pressure. If you are in a low-pressure loop or gravity-draining, there isn't enough pressure to lift the piston. You require a "Direct-Acting" valve for those specific low-differential tasks.

2. "Can I use this for seawater? It is Stainless Steel."

NO. SUS304 is vulnerable to chloride-induced pitting (salts). For seawater or hydrochloric acid, specialized alloy or plastic valves are required.

3. "Why choose Normally Closed (NC)?"

In 90% of steam or chemical applications, the safe state is "off." NC ensures that if your PLC or power fails, the hazardous flow stops immediately.

Unattended, Extreme Duty

The AirTAC 2L (Pilot, NC) Series is the professional's choice for indestructible fluid control. By leveraging "Pilot" physics to control massive flows with minimal power and protecting the core with a "Triple Armor" of SUS304 and PTFE, it provides the ultimate set-it-and-forget-it gateway for process water and steam. When your application exceeds the limits of brass, the 2L is your final answer.