Parker’s A4AD pressure regulator features dual pressure regulating pilots in a single housing which allows users to control two different pressure set points without the need for additional piping, valves, or controls. The active pressure regulating pilot is selected using a standard pilot solenoid. This simple control gives users flexibility in their process but keeps implementation costs to a minimum. The A4AD is part of the popular A4A line and features common components and service parts.

Markets:
• Industrial Refrigeration
• Commercial Refrigeration

Features and Benefits:
• Pilot Operated characterized Modulating Plug for precise control
• Suitable for all common refrigerants and oil
• 28bar (400psig) Maximum Rated Pressure (MRP)
• Flanges for threaded or welded steel pipe and copper tube (copper not for ammonia)
• Unique modular construction
• Interchangeable parts
• Easy to service
• Close coupled strainers, optional
• Many control variations are possible with the use of a few modules and kits
• Stainless Steel diaphragm
• Chrome plated Pilot Seat
• Manual Opening Stem

Application:
• Capacity Control of an evaporator at two different pressure levels to regulate temperature
• Evaporator Pressure Control combined with Defrost Pressure Relief