Topworx Switchboxes
TopWorx TXP-M20GNMM Limit Switchbox
TopWorx TXP-M20GNMM Limit Switchbox
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The TopWorx TXP-M20GNMM Limit Switch Box from the TXP series is a rugged, industrial-grade valve position feedback and monitoring solution designed for direct-mounting on quarter-turn actuators in harsh and hazardous environments. The “M20” in the model code denotes the conduit entry size (two M20 ports) and “M2” denotes the switch configuration (2 × mechanical SPDT). With an aluminium “tropicalised” housing, NAMUR stainless steel shaft, and IP66/67 (or equivalent) ingress protection, this unit offers high reliability and simplicity of installation across oil & gas, petrochemical, water, wastewater and general industrial automation applications.
The model is intrinsically safe (Area Classification “0”) when configured accordingly, making it suitable for Zone 1 hazardous areas under ATEX/IECEx/IEC standards.
Key Features
Aluminium “tropicalised” cast enclosure (Series TXP) for durability in challenging environments.
Mechanical switches: 2 × SPDT (M2) providing open/close feedback.
Conduit entries: (2) M20 ports, facilitating standard metric cabling.
Visual display: Standard 90° (Green = OPEN, Red = CLOSED) “G” type indicator.
Shaft interface: NAMUR (316 stainless steel) compatible with many actuators’ NAMUR interface or bolt-on drive adapter.
Area classification: “0” (Intrinsically Safe) option for hazardous area use (ATEX/IECEx) – for use in Zone 1 and possibly Zone 0 installations.
Ingress protection: IP66/67 or equivalent rating (dust proof, protected against powerful water jets) for outdoor or wash-down applications.
Flexible ordering/configuration: The TXP series offers a modular ordering system (enclosure, bus/sensor type, area class, etc) enabling customised switch box configurations.
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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.