Honeywell 311618 Spring

The Honeywell 311618 is a heavy-duty pneumatic actuator main spring engineered for high-performance pressure regulation in commercial HVAC systems. This 8-12 lb range spring, distinguished by its gray color-coding, is the standard replacement spring for MP953 series actuators, specifically the 5-inch diameter MP953A, MP953C, and MP953E models. Designed to provide consistent return force for Honeywell pneumatic valve actuators, it ensures precise proportional control of steam and water valves. Honeywell part number 311618 is functionally identical to the 311618/U universal version, making it a drop-in component for field repairs. This critical HVAC control part maintains the necessary tension to overcome internal friction and line pressure, preventing hysteresis and ensuring the valve returns to its fail-safe position accurately. When performing maintenance on 5" pneumatic operators, technicians rely on this spring to restore the designated 8-12 PSI operating range required for optimal system balancing and energy efficiency.

• Direct OEM Compatibility: Verified for use in 5-inch Honeywell MP953A, C, and E pneumatic actuators.
• Precise 8-12# Range: Calibrated to provide the exact force required for high-pressure pneumatic control loops.
• Color-Coded Identification: Gray finish allows for immediate visual verification of spring rate during installation.
• Durable Construction: Built to withstand the high-cycle demands of commercial steam and chilled water applications.

Is the 311618 interchangeable with the 311618/U?
Yes, both part numbers represent the same 5-inch, 8-12# gray main spring. The "/U" suffix simply denotes a universal packaging designation for the same technical specification.

Will this spring work with 8-inch or 13-inch actuators?
No, the 311618 is specifically sized for 5-inch diameter actuators. Larger actuators require different spring diameters and load ratings to function correctly.

What does the 8-12 lb rating signify for the actuator?
This rating defines the pressure range (in PSI) over which the actuator will move through its full stroke, essential for sequencing multiple valves or dampers on a single controller.

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.