IL211-02B: Safety Lock, Position-Holding on Air Loss! Pilot-Operated Pneumatic Locking Valve Empowers Safety Control Systems

In safety-critical applications where it is essential to ensure that actuators (e.g., cylinders) maintain their current position during faults like air or power loss, preventing unintended movement due to load gravity or external forces, standard directional control valves cannot meet the position-holding requirement. The IL211-02B is a pilot-operated pneumatic locking valve (also known as a pressure-holding or lock valve). It automatically locks the air path through its internal mechanical structure upon loss of electrical signal or pilot air, achieving safe position holding for the actuator, making it an ideal component for safety applications like vertical lifting and clamping.Core Product Advantages

• Safety Position LockingUpon power loss or pilot air pressure loss, the spool automatically switches to the locked state via spring force or pressure differential, simultaneously sealing the air paths on both sides of the actuator (cylinder). This effectively prevents load dropping or shifting, ensuring equipment and personnel safety.
• Pilot-Operated Control, Sensitive ResponseEmploys a pilot-operated control structure. A small-diameter control signal (pilot air) is sufficient to drive the main spool to change position. It offers sensitive control and low power consumption.
• Dual-Acting Safety ProtectionSuitable for double-acting cylinders. It can reliably lock both the inlet and exhaust ports of the cylinder simultaneously, locking the piston rod at any point within its stroke.
• Manual Unlocking FunctionEquipped with a manual override device (typically a button or pull-ring), facilitating manual reset or debugging during system faults, improving maintenance safety and convenience.
• High Sealing ReliabilityFeatures a precise internal structure and excellent sealing performance, with minimal leakage in the locked state, ensuring long-term locking reliability.

Typical Application Scenarios

• Vertical Lifting Mechanisms: Prevents platforms, robotic arms, etc., from dropping due to their own weight upon air loss.
• Safety Clamping Devices: In jigs, molds, etc., ensures the workpiece remains firmly clamped even under pressure loss.
• Safety Guarding Equipment: Serves as a locking unit for safety doors, protective covers, keeping them closed upon air supply failure.
• Intermediate Position Holding: Applications requiring a cylinder to be precisely locked in position at any point in its stroke for extended periods.

Technical Parameters (Typical Values)

• Port Size: G1/4″ or G1/8″ (02B may indicate port size code)
• Operating Pressure: 0.1 ~ 1.0 MPa
• Pilot Control Pressure: ≥ 30%-50% of operating pressure
• Operating Temperature: -5°C ~ +60°C

Closing SummaryThe IL211-02B locking valve is the “safety guard” of pneumatic safety control circuits. It provides a fault-safety barrier for pneumatic systems through its reliable locking function, effectively preventing dangerous equipment movements caused by power source failure. It is a key component for enhancing the inherent safety of equipment.