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TopWorx Limit Switch Box TVF-K20GN1M1A8 Valve Monitor
TopWorx Limit Switch Box TVF-K20GN1M1A8 Valve Monitor
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The TopWorx TVF-K20GN1M1A8 is a member of the TVF series of valve-position monitors, optimized for direct-mounting on quarter-turn actuated valves (ball, butterfly, plug) in safe-area or intrinsically safe installations.
This configuration delivers robust mechanical switch feedback (gold contacts), clear visual indication of valve status, and mounting flexibility tailored for intrinsically-safe zones.
Key Features
Certified intrinsically safe (Area 0) rating — suitable for use in hazardous zones requiring Ex ia approval.
Dual mechanical SPDT gold-contact switches (K2) ensure reliable open/closed feedback for actuated valves.
90° visual indicator with colour-coded display (Green = OPEN, Red = CLOSED) for rapid field verification.
NAMUR stainless steel shaft interface enables direct mounting to many standard actuators, reducing adaptor requirements.
Tropicalised aluminium enclosure with clear resin lid — rugged, corrosion-resistant, and designed for industrial durability.
Wiring flexibility via (2) M25 conduit entries with silicone O-ring sealing — supports secure installation in harsh environments.
Modular TVF series architecture allows custom configurations (switch type, indicator colour, wiring entries, certifications).
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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.