140N vs. 100N Thrust: What Does the 40N Gap Mean for High-Rise HVAC?

In the mechanical design of skyscrapers, the selection of Fan Coil Unit (FCU) actuators is often oversimplified. However, when we dive into Close-off Pressure, the subtle difference in thrust becomes the deciding factor between a reliable system and a maintenance nightmare.

Today, we break down a specific engineering question: Why is a 140N thrust actuator essential for high-rise buildings, while 100N often falls short?

1. The Physics: The Invisible Giant in Water Systems

In high-rise structures, water loops face immense vertical static pressure. Even with pressure-reducing valves, the branches on lower floors endure high differential pressures during system operation.

●The 100N Reality: Many standard actuators are rated at 100N. While sufficient for low-rise residential units, this force often struggles to "hold the line" against the sheer hydraulic lift in high-rise environments.

●The Consequence: The valve plug fails to achieve a complete seal against the seat, leading to Internal Leakage.

2. Deep Dive: 40N Extra Force Equals 40% More Security

The Saswell SA905-S linear actuator provides a rated thrust of 140N. This 40N gap isn't just a number; it is vital engineering "safety redundancy."

A. Overcoming High Reverse Differential Pressure

Based on the formula F=P×A (Force = Pressure × Area), the upward force exerted by water on the valve plug increases dramatically in high-static-pressure zones. The 140N thrust ensures the valve is locked down tight, achieving a "Zero Leakage" seal even under extreme conditions.

B. Counteracting Friction and Scaling

Over years of operation, O-rings can stiffen, and mineral deposits (scaling) can increase friction along the valve stem.

●100N Actuators: As friction increases, the effective closing force may drop below the required threshold, resulting in a valve that stays slightly ajar.

●140N Actuators (SA905-S): The extra power reserve allows the device to overcome mechanical resistance and scaling, ensuring the valve reaches its full seat depth every time.

C. Eliminating Energy "Drain"

If a 500-room high-rise hotel has 20% of its valves leaking due to insufficient thrust, cooling energy is wasted even when guests have their AC off. This inefficiency can increase chiller and pump energy consumption by 5%-10% annually.

3. Structured Data: Engineering Selection Reference

4. Conclusion: Providing "Certainty" for Skyscrapers

In HVAC engineering, the highest cost is post-installation maintenance. For high-rise projects, the close-off pressure at lower levels is a mandatory benchmark.

The Saswell SA905-S and its 140N thrust resolve the physical challenge of valve closure. Coupled with supercapacitor fail-safe technology, it ensures total system integrity. That 40N difference is the gap between "good enough" and "engineered for excellence."

Thrust Safety Redundancy for High-Rise Water Systems

SA905-S 140N Rated Thrust, Resist Static Pressure & Prevent Failures