Refrigerating Specialties A4AJ Electric Pilot Regulators

These compact, heavy duty, electronically controlled pilot operated, iron alloy (ASTM A126 Class B) regulators are suitable for Ammonia, R22, R134A, and other common refrigerants. All A4AJ regulators are electronically pilot operated using upstream pressure for the opening force and require a minimum 2 psi (0.14 bar) pressure drop to fully open the main valve.

These valves are generally ordered with close coupled upstream strainers to prevent entrance of foreign material into the valve and the rest of the system. (See current Bul 00-10 for strainer information.) The A4AJ electronic pilot regulator utilizes a Landis & Staefa M2FP03GX direct operated linear-proportional solenoid as a pilot valve to modulate the flow of pilot pressure to the top of the regulator's piston.

The positioning of the electronic pilot actuator is proportional to the input signal supplied to the electronic valve. For example, considering a 4-20 mA input signal from a suitable controller, a 4 mA signal results in the pilot valve being in a closed position, a 12 mA signal results in the pilot being 50% opened, and a 20 mA input signal results in the pilot valve being fully opened.

The only moving part of the electronic pilot valve, the plunger (or core), is virtually frictionless and changes its position against a counter spring with each change in current. Two separate control modules are available which respond to the supply signal from an external controller which senses the medium being cooled. Modules are mounted on a base attached to the solenoid housing with two phillips head screws, and can be easily changed in the field, if required. A 0-10 VDC module (P.N.308229), or a 4-20 mA module (P.N. 308231) are available, which respond to the designated input signal. These control modules are an integral part of the valve and should be part of the description when ordering.

For personal assistance on RS products contact RCC.

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