EMERSON TVA-M2WGNCM Valve Assembly

Emerson TVA-M2WGNCM Valve Assembly (TopWorx Valve Position Monitor)

 

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The Emerson TVA-M2WGNCM is not a fluid valve body inside a pipeline. It is a TopWorx TVA series valve position monitor / switchbox assembly, used to detect and report valve open/close position in industrial automation systems.

It is typically mounted on top of a quarter-turn valve (ball or butterfly valve) or actuator.

Key Specifications

• Model: TVA-M2WGNCM
• Brand: Emerson (TopWorx)
• Product Type: Valve Position Switchbox / Valve Monitor Assembly
• Function:
  • Detects OPEN / CLOSED valve position
  • Sends electrical feedback signals to PLC/DCS
• Switch Type: 2 × mechanical SPDT switches
• Shaft Standard: NAMUR stainless steel interface
• Enclosure: High-strength composite resin housing
• Visual Indicator:
  • Green = OPEN
  • Red = CLOSED
• Conduit Entries: M20 industrial cable ports
• Protection: Suitable for industrial environments (often IP66/67 class depending configuration)

(Source: TopWorx TVA series valve position monitors and TVA-M2WGNCM configuration data )

What it actually does

This device does NOT control fluid flow directly.

Instead, it:

• Mounts on a valve actuator
• Rotates with the valve stem
• Uses internal cams to trigger switches
• Sends signals:
  • Valve OPEN signal → PLC input
  • Valve CLOSED signal → PLC input

So it is a feedback device, not a control valve.

Features & Advantages

• Reliable mechanical position feedback
• Direct mounting on NAMUR actuator interface
• Clear visual OPEN/CLOSE indicator
• Dual switch redundancy (2 SPDT outputs)
• Rugged housing for harsh environments
• Used in hazardous / industrial locations (oil & gas ready designs)

Applications

• Oil & gas pipelines
• Chemical processing plants
• Water treatment systems
• Power plants
• Pneumatic / hydraulic valve automation
• Industrial process control systems