Honeywell 313745 Diaphragm

The Honeywell 313745 Diaphragm is a high-temperature replacement component designed specifically for 5-inch diameter MP953 pneumatic actuators. Engineered for MP953A, MP953C, and MP953E series valve actuators, this replacement part ensures reliable pressure regulation and stroke precision in demanding HVAC environments. Utilizing high-grade elastomers capable of withstanding elevated temperatures, the Honeywell 313745 maintains its structural integrity and flexibility under thermal stress, preventing premature failure of the pneumatic valve actuator. When performing field teardowns or maintenance on Honeywell actuators, utilizing this OEM-spec diaphragm is critical for restoring original sequence timing and closing force. This component is essential for precision HVAC control systems where maintaining the pressure rating and ambient temperature limits of the pilot positioner or standard actuator is required. Proper installation of the Honeywell replacement diaphragm facilitates consistent modulating control in steam or hot water applications.

• High-Temperature Resilience: Engineered to withstand elevated ambient temperatures common in steam and mechanical rooms.
• System Compatibility: Drop-in replacement for any 5-inch MP953 pneumatic actuator, ensuring zero-gap fitment.
• Leak Prevention: High-tensile elastomer construction prevents air leakage, maintaining calibrated pneumatic pressure across the stroke.
• Reduced Downtime: Simplifies field repairs of MP953 series actuators without requiring a full unit replacement.

Is the 313745 compatible with all MP953 models?
The 313745 is designed exclusively for the 5-inch diameter versions of the MP953A, MP953C, and MP953E series. Always verify the actuator diameter before installation.

When should a diaphragm be replaced in a pneumatic actuator?
Replace the diaphragm if you observe slow response times, air leakage at the actuator housing, or if the elastomer shows signs of thermal cracking during routine inspection.

Does this diaphragm include the replacement hardware?
This is the individual Honeywell 313745 replacement diaphragm; internal plates and fasteners from the original actuator assembly should be inspected and reused if they are within spec.

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.