METSO A413160 Pneumatic relay module

The Metso (now Neles/Valmet) A413160 is a critical pneumatic component, specifically the Spool Valve Assembly / Pneumatic Relay Module used within the Neles ND9000 series intelligent valve positioners. 

It is the high-capacity version of the pneumatic amplifier stage.

1. Product Description

The A413160 is a high-flow pneumatic relay designed to control the flow of compressed air to large-scale actuators.

 In an intelligent positioner, while the electronics (CPU board) provide the logic, the A413160 acts as the "power stage." It translates low-power pilot signals into high-volume air movement to ensure large valves can open or close rapidly and accurately.

It features a precision-machined spool and sleeve design, optimized for long life and minimal friction, ensuring that the valve positioner can modulate with sub-millimeter precision.

2. Technical Parameters (Technical Data)

3. Product Advantages & Key Features

High Flow Capacity: Specifically designed for large-volume actuators (like the Neles B1C/B1J 50 and above), significantly reducing the "Stroking Time."

Minimal Hysteresis: The spool valve design ensures a linear relationship between the pilot signal and output flow, preventing "jumping" or erratic valve movement.

Internal Filtration: Equipped with fine-mesh protection screens to prevent pilot orifice clogging from instrument air debris.

Energy Efficient: Despite its high-flow capability, it maintains an extremely low bleed rate when the valve is in a steady state, saving plant air costs.

Field Replaceable: Modular design allows for the replacement of the entire relay unit in minutes without removing the positioner from the valve.

4. Application Cases

Large Bore Control Valves: Used on 12" and larger butterfly or ball valves where massive air volumes are needed for movement.

Fast Action Dampers: Control of air intake or exhaust dampers in power plants requiring rapid modulation.

Anti-Surge Valves: In compressor stations where the valve must react within milliseconds to prevent catastrophic equipment damage.

High-Vibration Environments: Mining and pulp processing where mechanical stability of the pneumatic stage is vital for consistent control.

5. Related & Other Models in the Series

The A413160 is part of the modular pneumatic family for the ND9000:

ND9200: The high-flow version of the positioner that typically uses this A413160 relay.

A413152: The standard-flow relay version for smaller actuators.

A413120: An alternative relay module for specific older revisions of the ND9100.

B1-Series Actuators: The pneumatic cylinders (Double Acting or Spring Return) that this module powers.

A413111: The feedback potentiometer that works in tandem with this relay to confirm valve position.