The Johnson Controls MP843D001 MP84 Actuator is a heavy-duty pneumatic valve actuator designed for high-precision positioning of hot water, chilled water, and steam control valves. Part of the MP8000 Series, this 50-square-inch effective diaphragm area unit utilizes a 4 to 8 psi spring range and a 3/4-inch stroke to ensure reliable mechanical force for globe valve applications. Built for the rigors of commercial HVACR maintenance, it features a die-formed carbon steel housing with a corrosion-resistant finish and an EPDM molded diaphragm that maintains a constant effective area throughout the entire stroke. This spring return stem up model is engineered for normally open valve configurations, providing a fail-safe position during a loss of pneumatic control signal pressure. With a 1/4-inch barbed hose connection and a maximum control pressure rating of 25 psi, the MP843D001 integrates seamlessly into existing pneumatic loops, offering field-reversible action for simplified site-specific adjustments. Key Benefits Enhanced Durability: The carbon steel housing and chrome-silicon steel spring are coated for superior resistance to moisture and industrial atmospheric contaminants. Precise Control: The high-quality EPDM diaphragm facilitates linear stem movement, reducing hysteresis in proportional control sequences. Vivid Diagnostics: Each unit includes a built-in position indicator for immediate visual verification of the valve stem position during routine inspections. Flexible Integration: Designed for universal application across water and steam systems, it is compatible with a wide range of Johnson Controls and third-party pneumatic valve bodies using appropriate mounting kits. Common Questions What is the maximum air pressure for the MP843D001? The unit is rated for a maximum control pressure of 25 psi. Operating beyond this limit may damage the internal diaphragm. Is the action of this actuator reversible? Yes, the MP8000 Series design allows for field-reversible action, enabling technicians to switch between spring-return-up and spring-return-down configurations as required by the application. Which media types is this actuator compatible with? This actuator is optimized for managing valves in steam, chilled water, and hot water systems, making it a standard choice for central plant and AHU coils. 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.
