Honeywell 312505 Diaphragm

When you're servicing large-scale pneumatic systems, maintaining the structural integrity of your actuators is non-negotiable. This Honeywell 312505 13-inch Diaphragm is a direct replacement component engineered for high-performance MP953A, MP953C, and MP953E series actuators. Built from robust, high-grade neoprene, this "new style" regular temperature diaphragm provides the flexibility and resilience required for consistent modulating control in steam and water valve applications. As a technician, you know that a ruptured or losing-elasticity 13" diaphragm leads to sluggish response times and system inefficiency; swapping in this OEM-spec actuator repair part ensures the Honeywell pneumatic actuator returns to its original factory operating curve. It is specifically designed for standard temperature environments, typically rated up to 150?F, making it a staple for commercial HVAC pneumatic controls and boiler system maintenance. Designed for a precision fit within the 13-inch actuator housing, it ensures a leak-proof seal and reliable pressure-to-stroke conversion.

• Exact Compatibility: Purpose-built for Honeywell MP953A, MP953C, and MP953E 13-inch pneumatic actuators.
• Durable Neoprene Construction: Offers excellent resistance to wear and cycling fatigue in standard temperature air systems.
• Improved System Response: Restores the necessary pressure sensitivity for accurate valve positioning and building automation.
• Technician-Friendly Install: Features the "new style" beaded-roll design for a secure, repeatable seal during field maintenance.

Is this diaphragm compatible with high-temperature steam applications?
This specific model is the standard temperature neoprene version. For high-ambient or extreme temperature applications, we recommend verifying if your specific actuator requires the silicone variant often used in high-heat environments.

Can the 312505 be used on the 8-inch MP953 models?
No, this is a 13-inch diaphragm strictly designed for the larger frame 13" actuators. Using an incorrectly sized diaphragm will result in immediate seal failure and zero stroke control.

Does this include the replacement cup or mounting screws?
This listing is for the replacement diaphragm only. We recommend inspecting the actuator cup and follower for signs of pitting or corrosion while the unit is disassembled for the diaphragm swap.

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.