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TopWorx Limit Switch Box TVF-K20GNMM Valve Monitor
TopWorx Limit Switch Box TVF-K20GNMM Valve Monitor
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Key Features
Dual mechanical SPDT switches with gold contacts (K2) — provides reliable open/closed feedback signals.
90° Green/Red visual indicator for clear on-site verification of valve position.
NAMUR stainless-steel shaft interface allowing direct mounting to suitable actuators (simplifies installation).
Tropicalised aluminium base plus clear resin lid for good durability and field visibility in corrosion-prone industrial settings.
Metric M20 wiring entries with silicone O-ring sealing — robust wiring ingress protection.
Intrinsically safe rating (Area 0) for use in hazardous or high-risk zones where Ex ia certification may apply.
Low profile, direct-mount design (TVF series) — helps reduce piping/actuator footprint.
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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.