Parker A4ADP Port DN75 4″ Pneumatic Suction Regulator
The Parker A4ADP Port DN75 4″ Pneumatic Suction Regulator is a high-quality component designed to provide precise control over suction pressure in HVAC and refrigeration systems. Manufactured by Parker, a trusted name in industrial equipment, this regulator ensures reliable and efficient performance across various applications.
Key Features
- Dual Pressure Regulation: Equipped with dual pressure regulating pilots within a single housing, allowing for control of two distinct pressure set points without the need for additional piping or valves.
- Pilot Operated Modulating Plug: Features a pilot-operated, characterized modulating plug that delivers precise control over pressure levels.
- Versatile Compatibility: Suitable for use with all common refrigerants and oils, enhancing its adaptability across different systems.
- High Pressure Capacity: Designed to handle a maximum rated pressure (MRP) of 28 bar (400 psig), accommodating demanding operational requirements.
- Flexible Installation Options: Comes with flanges compatible with threaded or welded steel pipes and copper tubes (note: copper tubes are not suitable for ammonia applications).
- Modular Construction: Boasts a unique modular design with interchangeable parts, facilitating easy servicing and maintenance.
- Optional Strainers: Offers the option for close-coupled strainers to prevent the ingress of foreign materials into the system.
- Durable Components: Incorporates a stainless steel diaphragm and a chrome-plated pilot seat to enhance longevity and performance.
- Manual Operation Capability: Includes a manual opening stem for direct control when necessary.
Applications
- Evaporator Capacity Control: Manages evaporator capacity at two different pressure levels to regulate temperature effectively.
- Defrost Pressure Relief: Combines evaporator pressure control with defrost pressure relief functions, optimizing system performance during defrost cycles.
With its robust construction and advanced features, the Parker A4ADP Port DN75 4″ Pneumatic Suction Regulator is an excellent choice for professionals seeking reliable and efficient pressure regulation in their HVAC and refrigeration systems.







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