Quincy Compressor 1855 Unloader Diaphragm

The Quincy Compressor 1855 Unloader Diaphragm is a critical component for maintaining precise pressure regulation in Quincy reciprocating compressors. Designed for heavy-duty industrial applications, this OEM-equivalent diaphragm facilitates the unloading process, allowing the compressor to start without backpressure and reducing wear on the motor and drive components. This air compressor unloader part is manufactured from high-grade reinforced elastomers to withstand the thermal stress and rapid cycling common in Quincy QR-25 series and similar pressure-lubricated models. A failing diaphragm often leads to continuous leaking at the unloader valve or the compressor’s inability to reach cutout pressure, directly impacting volumetric efficiency. Replacing a worn 1855 Quincy diaphragm restores the pneumatic signal integrity within the unloader assembly, ensuring the intake valves seat correctly during the loaded cycle. This is a standard wear item for technicians performing preventative maintenance on Quincy head unloader systems to prevent excessive cycling and premature component fatigue.

• Precise Pressure Control: Restores reliable unloading cycles to prevent motor strain during startup.
• Industrial-Grade Durability: Engineered with reinforced materials to resist oil degradation and high-temperature fluctuation.
• System Efficiency: Eliminates air bypass leaks in the pneumatic unloader circuit, maintaining optimal CFM output.
• Direct Compatibility: Built to exact dimensional specifications for a seamless fit in Quincy air compressor heads.

What are the symptoms of a ruptured unloader diaphragm?
Technicians typically observe air constantly venting from the unloader pilot valve or the compressor failing to transition from an unloaded state to a loaded state, often caused by a loss of pneumatic pressure against the diaphragm.

Is the 1855 diaphragm compatible across different Quincy models?
While primarily utilized in the QR-25 and various small-to-mid-range reciprocating pumps, you should verify your specific Quincy compressor parts manual to ensure the 1855 part number matches your unloader head configuration.

Does this diaphragm require specialized tools for installation?
Standard service tools are sufficient; however, ensuring the mating surfaces of the unloader housing are clean and free of debris is vital to achieving a proper airtight seal during reassembly.

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.