Honeywell 312817AA Actuator

The Honeywell 312817AA Actuator is a field-proven pneumatic solution engineered for the proportional control of VP512A Series unit ventilator valves. This pneumatic valve actuator assembly features a 3-8 psi spring range and a precise 1/2-inch stroke, making it the industry standard for managing steam and hot water coils in commercial HVAC systems. Designed with a high-strength aluminum housing and a resilient Buna-N diaphragm, the 312817AA is built to withstand the rigors of mechanical rooms while maintaining low-hysteresis movement for accurate valve positioning.

For technicians performing maintenance or retrofits, this unit is the direct replacement for obsolete operator tops, ensuring continued compatibility with VP512, VP517, and VP513 valves. The assembly facilitates a straightforward installation on the valve bonnet using a stem-locking slide, providing reliable mechanical linkage. By utilizing a 3 to 8 lb/in² operating range, it allows for seamless sequencing with outside or return air dampers, delivering stable temperature control in unit ventilator cycles. This Honeywell pneumatic actuator is essential for contractors looking to restore factory-spec performance to legacy pneumatic control loops without replacing the entire valve body.

• Universal Compatibility: Engineered specifically as the standard assembly for Honeywell VP512A Series valves.
• Durable Construction: Features a rugged aluminum shell and a Buna-N diaphragm for long-term reliability in hazardous or demanding environments.
• Precision Control: The 3-8# spring range ensures accurate proportional response to branch line pressure changes.
• Easy Installation: Integrated 1/2" stroke design with a stem-locking slide allows for quick field mounting and adjustment.

What valves are compatible with the 312817AA actuator?
This actuator is primarily designed for the VP512A Series, but it is also compatible with VP512, VP513, and VP517 valve bodies.

How do I adjust the start point for this pneumatic actuator?
Technicians can verify the start point by monitoring the branch line pressure; the stem should begin moving at 3 psi. Fine adjustments are typically handled through the controller or the positioning of the stem button.

Can the diaphragm be replaced separately?
Yes, while this is a complete assembly, the internal Buna-N diaphragm (often part number 313745) can be serviced if the housing remains intact.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.