The APL-310N limit switch box is designed to provide reliable open/close position feedback for quarter-turn valve automation systems driven by pneumatic or hydraulic actuators. It is used in industrial environments where accurate valve status indication is required for process control, safety interlocking, and remote monitoring applications.
In automated valve systems, position feedback plays a critical role in ensuring correct sequencing and safe operation. The APL-310N is mounted directly on the actuator and converts valve rotation into mechanical or electrical switching signals, allowing control systems such as PLC or DCS to verify valve status in real time.
Product Specifications
| Model | APL-310N |
| Material | Aluminum Diecasting/Stainless Steel (304/316) |
| Shell |
IP67 |
| Ambient temperature | -25℃ ~ +85℃ |
| Position indicator | on-yellow; off-red |
| Cable entry | 2-1/2NPT; PT1/2; PF1/2; M20; PG13.5 |
Designed for Industrial Field Applications
The APL-310N is engineered for use in demanding industrial environments where equipment is exposed to vibration, temperature variation, and outdoor installation conditions. It is commonly selected for applications where reliable switching performance is required over long operational cycles.
Typical operating environments include:
- Oil and gas pipeline systems
- Petrochemical processing plants
- Water and wastewater treatment facilities
- Power generation systems
- Industrial automation skids
- General process control installations
In these systems, stable valve position feedback is essential for preventing incorrect valve operation and maintaining process integrity.
Rugged Housing Construction
The enclosure of the APL-310N is available in aluminum die-casting or stainless steel (304/316), providing flexibility for different environmental and corrosion requirements.
- Aluminum die-casting version: suitable for general industrial service conditions
- Stainless steel version: suitable for offshore, chemical, and high-corrosion environments
The housing is designed with an IP67 protection rating, ensuring resistance against dust ingress and temporary water immersion. This makes the unit suitable for both indoor and outdoor valve automation installations.
Reliable Valve Position Indication
The APL-310N provides clear visual indication of valve position through a high-visibility indicator system:
- Yellow indicator: valve open position
- Red indicator: valve closed position
This allows maintenance personnel and field operators to quickly verify valve status without connecting to control systems, improving operational efficiency during inspection and maintenance activities.
Electrical Interface and Cable Entry Options
To support global installation requirements, the APL-310N is equipped with multiple cable entry configurations:
- 2 × 1/2" NPT
- PT1/2
- PF1/2
- M20
- PG13.5
This ensures compatibility with different regional wiring standards and simplifies integration into pneumatic actuator control systems.
In valve automation systems, reliable position feedback is essential for maintaining safe and efficient operation. The APL-310N limit switch box is designed to deliver stable switching performance under real-world industrial conditions, making it suitable for both standard process control and demanding field applications where durability and consistency are required.
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