Hydraulic Safety Block TN25 Category 4

Description

High Performance and Safety for Heavy Presses and Injection Molding Machines

When the challenge is to reconcile high flow rates with the rigorous requirements of NR-12, the TN25 Category 4 Hydraulic Safety Block from ACT Sistemas Hidráulicos is the definitive technical solution. Unlike smaller models, the TN25 uses monitored logic elements (cartridges), allowing the control of large volumes of oil with minimal pressure drop and maximum response speed.
This block is the heart of safety systems in high-tonnage presses, injection molding machines, and large-scale equipment, where component failure is not an option.

Key Advantages of the TN25 Block with Logic Elements
• Logic Elements Technology (Cartridges): Instead of spool directional valves, the TN25 uses monitored Atos LIFI/LIDA logic elements. This architecture allows for much higher flow rates and greater durability in fast cycles.
• Poppet Position Monitoring: Each logic element features an inductive proximity sensor that monitors the actual position of the poppet. This ensures that the safety PLC knows precisely whether the line has been intercepted.
• Category 4 Safety (Total Redundancy): Designed to ensure that the failure of a logic element or pilot valve does not compromise the safe stopping of the machine.
• Venting Valve: The block’s pressure control is also performed by a monitored valve, creating a dual safety loop.
• Robust Cast Iron Construction: Manifold block machined from high-strength cast iron bar (139.7 mm x 165.1 mm), supporting pressures up to 315 bar.

Technical Specifications (TN25 Model)

Parâmetro Técnico	Especificação Detalhada
Válvula de Ventagem	Atos DKE-1631/2/FV-N24DC (Monitorada)
Elementos Lógicos	Atos LIFI-25433/NC (Monitorados)
Válvula de Alívio Principal	DBDH20-K-10/315 (Alta Vazão)
Vazão Nominal	Projetado para sistemas de alta capacidade (Consultar projeto)
Pressão Máxima	315 bar (4568 PSI)
Tensão de Comando	24V DC
Conexões de Pórticos	P, T, X2 (G 1") e X1 (G 3/4")
Certificações	CE, TÜV, SIL 2/3, PL e

Operation and Safety Logic (NR-12)
The logic of the TN25 is based on cross-monitoring between the pilot valve and the power logic elements:

1. Rest State (Safety): The logic elements remain closed, blocking the flow of oil to the cylinder. The sensors confirm the “closed” position.
2. Advance Command: The pilot valve directs the oil to the drain, thereby opening the logic elements. The system monitors the response time and synchronized opening.
3. Fault Monitoring: If one of the logic elements fails to close (due to contamination or spring breakage), the sensor will send an error signal to the safety PLC, which will prevent the next cycle and shut down the motor-pump group.

Certifications and Compliance

• NR-12 (Brazil): Full compliance for presses, press brakes, and large-scale machinery.
• ISO 13849 (PL e): Maximum performance level for control systems.
• IEC 61508 (SIL 2 / SIL 3): Functional safety integrity certification for electronic and hydraulic components.
• Machinery Directive 2006/42/EC: International safety standard.

• Recommended Applications
• The TN25 model is the ideal choice for:

• High-Tonnage Presses (Automotive, metallurgical);
• Large-Scale Plastic and Aluminum Injection Molding Machines;
• Waste Compaction Machines;
• Heavy Forging and Stamping Systems.

Request a Sizing for the TN25 Block

Contact our technical team to size the ideal TN25 block for your application and ensure the safety and efficiency of your hydraulic system.

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