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Topworx Switchboxes

TopWorx Limit Switch Box DXP-M20BSES Valve Monitor

TopWorx Limit Switch Box DXP-M20BSES Valve Monitor

£279.00 GBP
£279.00 GBP
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The TopWorx DXP-M20BSES Limit Switch Box is designed for seamless valve monitoring in demanding environments, providing robust functionality with its tropicalized aluminum enclosure and intuitive 90° black visual display. Engineered for intrinsically safe applications, this switch box features two mechanical SPDT sensors that ensure accurate position feedback. The 316 stainless steel shaft offers durability in industrial settings, while dual ¾" NPT conduit entries facilitate straightforward installation. Additional durability is provided by silicone O-rings, enhancing the device’s resilience against harsh elements.

Key Features:

  • Rugged Enclosure: Tropicalised aluminium construction for enhanced durability in industrial environments.
  • Mechanical SPDT Sensors: Dual sensors for reliable and precise position feedback.
  • Intrinsically Safe: Suitable for hazardous locations with intrinsic safety classification.
  • Stainless Steel Shaft: ¼" DD 316 stainless steel for long-lasting performance.
  • User-Friendly Display: 90° black OPEN indicator for quick and easy visual status checks.
  • Conduit Entries: Equipped with (2) ¾" NPT entries for flexible wiring options.
  • Sealed Protection: Silicone O-rings ensure sealing against environmental contaminants.

This switch box is ideal for users seeking robust valve position monitoring with straightforward integration and dependable performance.

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FAQ's

What is the difference between a valve and an actuator?

A valve controls the flow of a fluid (such as water, gas, or steam), while an actuator is the device that operates the valve — automatically opening, closing, or positioning it. Actuators can be electric, pneumatic, or hydraulic, depending on the application and control requirements.

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.