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TopWorx Limit Switch Box TVA-R20GNAM0000B Valve Monitor
TopWorx Limit Switch Box TVA-R20GNAM0000B Valve Monitor
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The TopWorx TVA-R20GNAM0000B is part of the TVA series of modular valve-position monitors engineered for precision feedback and visual status indication of quarter-turn valve systems. Built into a high-impact composite resin housing, this model supports reliable open/closed monitoring in demanding industrial environments.
Key Features
Composite resin enclosure: lightweight, corrosion-resistant, and robust for industrial use.
Dual reed-switch SPDT modules (R2) offering reliable discrete electrical feedback of valve position.
90° colour-coded visual indicator: Green = OPEN, for quick on-site verification.
NAMUR stainless-steel shaft interface for secure and direct mounting to compatible actuators.
Dual ½″ NPT conduit entries for flexible wiring in imperial installations.
Silicone O-ring sealing for better moisture and dust ingress protection.
Intrinsically Safe rating (Area Classification “0”) — suitable for hazardous zones requiring this level of certification.
Modular TVA-series architecture: supports multiple sensor modules, visual display types, shaft interfaces and conduit-entry options.
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FAQ's
What is the difference between a valve and an actuator?
What types of actuators are available?
The main types of actuators are:
Pneumatic actuators – use compressed air for fast, reliable operation.
Electric actuators – use electrical power for precise control.
Hydraulic actuators – use fluid pressure for high-torque applications.
Each type offers unique advantages depending on the environment, media, and system control needs.
How do I choose the right actuator for my valve?
To select the correct actuator, consider:
Valve type and torque requirement
Power source available (air, electric, or hydraulic)
Operating environment (temperature, humidity, hazardous area)
Control signal type (on/off or modulating)
Matching actuator torque and compatibility with the valve’s ISO mounting ensures reliable performance.
What are the main types of valves used in automation?
The most common valves in automated systems include:
Ball valves – for tight shutoff and quick operation.
Butterfly valves – for larger flow control with compact design.
Globe valves – for precise throttling and flow regulation.
Check valves – to prevent backflow.
Gate valves – for full bore flow isolation.
What’s the difference between a double-acting and spring-return actuator?
Double-acting actuators use air (or power) to both open and close the valve.
Spring-return actuators use air to open (or close) the valve, and a built-in spring to automatically return it to a safe position when power or air is lost — ideal for fail-safe operation.
How often should valves and actuators be serviced?
Regular maintenance intervals depend on operating conditions, but a good rule of thumb is to inspect every 6–12 months.
This includes checking for leaks, lubrication, seal wear, and actuator responsiveness to prevent unexpected downtime.