Filter, Regulator, Lubricator (FRL) Assemblies
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Filter, regulator, lubricator (FRL) assemblies are pre-packaged or modular assemblies of common configurations of air filters, regulators, lubricators, and gauges.  Important specifications to consider when searching for filter, regulator, lubricator assemblies include regulator type, media, performance specifications, adjustment control, connectors or pipe size, body material, features, and environmental parameters.

Choices for regulator type for filter, regulator, lubricator assemblies include general purpose, high pressure, low pressure, differential or bias regulator and pressure reducing regulator.  General-purpose regulators are designed for typical industrial use; generally operates only above atmospheric pressure.  High-pressure regulators are rated for inlet pressures higher than general purpose; typically over 1000 psi.  Low-pressure regulators have special design characteristics for precise control of pressures typically below 15 - 20 psi.  A differential or bias regulator maintains a pressure differential between two locations in the system. Pressure-reducing valves are used to provide a sub-circuit with a supply of fluid at a pressure, which is less than the pressure in the main circuit.  Media types can be air, fuel or oil, gas, hydraulic fluid, liquid, and steam.

Important performance specifications to consider when searching for filter, regulator, lubricator (FRL) assemblies include regulating (adjustment) range, maximum flow (gas or air), maximum pressure rating, and filter minimum particle size rating.  The regulating or adjustment range dictates the limits of adjustment control.  The maximum flow specified for a gas or air application is unnecessary to specify if primary application is liquid.  The maximum pressure rating refers to the pressure rating for the valve or inlet pressure for the regulator.  The filter minimum particle size rating applies to filter, regulator, lubricator (FRL) assemblies. It is the smallest size particle that will be entrapped by the filter. This rating is an indication of the largest opening in the filter element.

Choices for adjustment control for filter, regulator, lubricator (FRL) assemblies include manual, analog voltage control, analog current control, pneumatic control, and digital interface.  Connectors and pipe sizes for FRL assemblies include 1/8" NPT, ¼" NPT, 3/8" NPT, ½" NPT, ¾" NPT, 1" NPT, 1 ½" NPT, 2" NPT, British standard pipe thread, and metric pipe thread.  Body materials can be Acetal, aluminum, brass, bronze, cast iron, steel, stainless steel, and zinc.  Common features for FRL assemblies include integral pressure gauge, pressure relief, tamper-proof, and corrosive media.  Important environmental parameters to consider include operating temperature.
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