Description
Parker A4AS Inlet Pressure Regulator with Pilot Electric Shut-Off is a high-performance, pilot-operated valve designed to precisely control refrigerant flow while providing complete shut-off capability when needed. Engineered for use with ammonia, R-12, R-22, R-502, and other common refrigerants, the A4AS features a rugged iron alloy body, stainless steel diaphragm, and chrome-plated pilot seat for long-lasting durability. Its integrated solenoid must be energized for the valve to regulate, ensuring zero flow when de-energized making it ideal for defrost cycles and temperature control systems. With a modular design, interchangeable parts, and a manual opening stem for service flexibility, the A4AS supports pressures up to 400 psig and operates across a wide temperature range from -50 F to 220 F.
