Refrigerating Specialties A4AL Differential Pressure Relief Regulator

These compact, heavy duty, pilot operated, iron alloy (ASTM A126 Class B) Differential Pressure Regulators are suitable for Ammonia, R22, R134a, R404a, R507 and other common refrigerants and fluids approved for use in refrigeration systems.

All A4AL Regulators are pilot operated using upstream pressure for the opening force and require a minimum 2 psi (0.14 bar) pressure drop to fully open. These valves are generally ordered with close coupled upstream strainer to prevent entrance of foreign material into the valve and the rest of the system.

A4AL Fig 1 Modulates flow of refrigerant liquid or gas to maintain a constant set-for pressure differential between regulator inlet and regulator outlet. Regulator applications are as follows: As a relief valve from pump outlet to accumulator of a liquid recirculating pump system to prevent pump overload or dry pumping when evaporator liquid solenoid valves are closed. Differential pressure will not vary despite fluctuating accumulator pressures. As a gas or liquid pressure regulator whenever it is desired to maintain a set-for pressure difference between regulator inlet and outlet. The fluid temperature range for the A4AL Series of Regulators is -50F to 220F (-45C to 105C).

For personal assistance on RS products contact RCC.

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