Refrigerating Specialties A4AP Pneumatically Compensated Inlet Pressure Regulator

All A4 type 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. These pneumatically compensated inlet pressure regulators modulate the flow of refrigerant gas or liquid to maintain a varying upstream (or inlet) pressure in response to a pneumatic signal received from a pneumatic controller. The regulator set-point will be directly varied, on a 1:1 basis (A4AP) or 3:1 basis (A4A3P), with value of the air pressure supplied to the bonnet.

Thus a pneumatically compensated regula-tor, by responding to the varying output air signal from a pneumatic controller, can change the evaporator pressure and temperature up and down to match a varying load condition.

A 1 psi increase in air pressure will increase the set point by 1 psi for the A4AP and 3 psi for the A4A3P. Generally, the pnuematic controller modulates the air pressure from 3 to 15 psig throughout its control range.

For personal assistance on RS products contact RCC.

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