SA91 Normally Open Electric Thermal Actuator

When power is interrupted, the SA91 retracts automatically, holding the valve open. This prevents system deadlock, protects pumps from dry-running, and eliminates overpressure damage in closed-loop systems. No backup power source required.

A visual indicator on the top of the housing allows users and technicians to immediately confirm valve position (open/closed) at a glance — without removing covers or accessing electrical connections, accelerating system diagnosis and on-site troubleshooting.

Industry-standard M30×1.5 mounting thread fits all major manifold brands and valve bodies. No adapters or custom brackets required — install in seconds with standard tools, making retrofit and new installations equally straightforward.

Proven wax expansion technology delivers silent, maintenance-free operation. With no motors or gears to wear out, the SA91 offers exceptional long-term reliability in demanding HVAC environments — ideal for noise-sensitive residential and hospitality projects.

Rigorously tested to withstand over 100,000 operating cycles, the SA91 delivers consistent, maintenance-free performance throughout the lifetime of the building — reducing replacement costs and minimizing system downtime.

Sealed IP45-rated housing resists dust ingress and splashing water, while the corrosion-resistant construction ensures reliable performance in manifold cabinets, plant rooms, and mechanical spaces with moderate humidity or exposure.