Johnson Controls MP8000-6350 Diaphragm & Seal Kit

The Johnson Controls MP8000-6350 Diaphragm & Seal Kit is a field-serviceable solution designed to restore peak performance to MP84, MP85, MP86, and MP87 Series pneumatic actuators. This 50-square-inch replacement diaphragm kit handles the critical task of converting air pressure into mechanical motion for chilled water, hot water, and steam control valves. The assembly features a high-grade EPDM rubber diaphragm and nitrile U-cup stem seals, ensuring a consistent effective area and airtight integrity throughout the actuator's stroke. In high-demand environments, pneumatic actuator leaking often stems from brittle or scored seals; this kit provides the precise Johnson Controls service parts required to eliminate air loss. For technicians managing larger HVAC pneumatic controls, note that the 100-square-inch MP86 and MP87 models utilize a dual-pod design and require two MP8000-6350 repair kits for a complete overhaul. Maintaining these assemblies is vital for preventing slow response times and erratic valve positioning in building automation systems.

• Optimized Compatibility: Specifically engineered for MP8000 series actuator maintenance, fitting MP84 through MP87 models seamlessly.
• Durable Material Construction: Synthetic EPDM diaphragm resists thermal degradation in steam and hot water applications.
• Complete Seal Restoration: Includes essential nitrile U-cups to prevent pneumatic stem leakage and ensure smooth travel.
• Reliable Pressure Response: Maintains a constant effective area of 50 sq. in. to ensure accurate valve modulation.
• Reduced Downtime: Simplifies field repairs without requiring full pneumatic valve actuator replacement.

How many kits are needed for an MP86 or MP87 actuator?
The MP86 and MP87 series feature a double-acting or larger pod design that requires two MP8000-6350 kits to service both sides of the internal assembly.

What are the symptoms of a failing actuator diaphragm?
Common indicators include an audible hissing sound (air leak), sluggish valve reaction, or the inability of the valve to reach its full stroke under standard 20-25 psig pressure.

Can this kit be used with other actuator brands?
No, this kit is precision-matched for Johnson Controls MP8000 series specifications; using it on non-JCI equipment will result in improper sealing and potential system failure.

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.