Honeywell 311749-00605 Cup Diaphargm

When you are servicing Honeywell pneumatic actuators, the Honeywell 311749-00605 Cup Diaphragm is the specialized 8-inch internal component required to maintain proper pressure seals and modulation. This authentic 8 inch cup diaphragm is designed specifically for the Honeywell MP953 series, providing the rolling action necessary for linear stem travel in MP953A, MP953C, and MP953E models. As a veteran technician knows, using a generic or incorrectly sized 13-inch diaphragm will lead to immediate failure in these specific 8-inch housings. This part ensures the actuator responds accurately to 3-13 psi or 5-10 psi signals without air bypass. This Honeywell actuator repair part is critical for restoring the proportional control of steam or water valves in commercial HVAC systems. Maintaining the integrity of the Rolling Diaphragm is essential for preventing hysteresis and ensuring the MP953 pneumatic valve actuator operates at peak efficiency during seasonal transitions.

• Precision Fit: Exactly matched for the 8-inch diameter housings of the Honeywell MP953A, C, and E series, eliminating guesswork during field repairs.
• Industrial Grade Material: Engineered to withstand the constant cycling and temperature fluctuations common in pneumatic control loops.
• Optimized Performance: Facilitates smooth, low-friction stem movement to prevent sticking or erratic valve positioning.
• OEM Reliability: Ensures the pneumatic seal meets original manufacturer specifications for internal pressure retention.

Which actuators are compatible with this 8-inch diaphragm?
This part is specifically engineered for use with Honeywell MP953A, MP953C, and MP953E pneumatic actuators that utilize an 8-inch diameter cup. It is not interchangeable with 5-inch or 13-inch models.

How do I identify if I need the 311749-00605 or the high-temperature version?
The 311749-00605 is the standard cup diaphragm for regular temperature applications. If you are servicing an MP953B, D, or F model rated for high-temperature steam applications, you must verify the specific part number as those often require silicone or high-temp variants.

What are the signs of a failing actuator diaphragm?
Common indicators include audible air leaks from the actuator housing, the valve failing to reach its full stroke, or "hunting" where the actuator cannot maintain a steady position despite a constant pilot signal.

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.