Johnson Controls D-251-6002 Diaphragm

For field technicians maintaining legacy pneumatic systems, the Johnson Controls D-251-6002 Diaphragm is the primary replacement component for Number 2 pneumatic actuators. This replacement actuator diaphragm is engineered from a durable synthetic rubber compound, specifically designed to restore the pressure seal and stroke integrity of D-251 series damper actuators. In the field, a ruptured diaphragm leads to air bypass and failed damper positioning; this single-piece JCI D-251-6002 ensures the actuator maintains the necessary force for precise HVAC pneumatic control. These components are frequently found in V-3000 and MP800 series valve assemblies and VG7000 valve configurations ranging from 1/2 inch to 2 inches. Built to withstand operating temperatures from -20° to 150°F, this industrial pneumatic diaphragm provides the mechanical resilience required for high-duty cycle damper actuator repair. High-volume HVACR replacement parts like the D-251-6002 are essential for contractors performing routine maintenance on Johnson Controls pneumatic infrastructures to prevent costly system downtime and air loss.

• Direct Fit Compatibility: Specifically designed as the standard Number 2 diaphragm for Johnson Controls D-251 pneumatic actuators.
• Durable Synthetic Rubber: Formulated to resist fatigue and maintain flexibility across a wide atmospheric temperature range.
• Leak Prevention: Restores the airtight seal within the metal housing, ensuring consistent force for 8-13# or similar spring ranges.
• Simplified Serviceability: Allows for cost-effective pneumatic actuator repair without the need for full unit replacement.

Which actuators are compatible with the D-251-6002?
This diaphragm is designed for use in all Johnson Controls Number 2 (No. 2) size pneumatic actuators, commonly utilized in damper and valve control applications like the V-3000 series.

What are the signs that my D-251 diaphragm needs replacement?
Technicians should look for air leaks around the actuator housing, a failure of the actuator to reach its full stroke, or sluggish response times during pressure changes.

Can this diaphragm be used for high-temperature steam applications?
While the diaphragm itself is rated for environmental temperatures up to 150°F, it is typically used in actuators that control valves for media up to 338°F, provided the actuator housing is properly isolated from direct heat.

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.