This question often puzzles engineers in the automation industry. Here’s the explanation:
1. Protection Against Transportation and Storage Risks Electric valves are typically preset to a 20% open position before leaving the factory. This partial opening prevents mechanical stress on critical components during transportation and storage. For instance:
- Sealing Ring Protection: A 20% open position avoids excessive compression of the sealing ring, which could cause deformation or premature aging. This is crucial since prolonged storage or delayed installation might exacerbate such damage.
- Micro Switch Preservation: The preset position reduces tension on the micro switch’s spring in the actuator, minimizing fatigue and ensuring reliable electrical contact during future operation.
2. Simplified Installation and Testing Maintaining a partially open state streamlines on-site workflows:
- Alignment Adjustment: The 20% opening allows installers to easily align the valve with pipeline flanges without risking misalignment-induced leakage.
- Pre-Testing Readiness: This position facilitates initial manual or automated testing, such as verifying the actuator’s direction and torque before final commissioning.
3. Long-Term Performance Assurance By preserving the valve’s integrity from factory to installation, users receive a product in optimal condition:
- Sealing Surface Integrity: Avoiding pre-installation wear ensures the valve’s long-term sealing performance.
- Actuator Durability: The preset position minimizes stress on gears and limit switches, extending the actuator’s lifespan.
Conclusion The 20% open position is a strategic design choice balancing protection, usability, and longevity. It guarantees that electric valves remain "installation-ready" while safeguarding their core components against environmental and operational hazards. This approach ensures seamless integration into automated systems, enabling rapid commissioning and reliable service.
Note: For detailed technical specifications or maintenance guidelines, refer to Grat Control Valve's official documentation or contact our engineering team.