How to Select Filter, Regulator, Lubricator (FRL) AssembliesHow to Select Filter, Regulator, Lubricator (FRL) AssembliesHow to Select Filter, Regulator, Lubricator (FRL) Assemblies

Image Credit: Numatics, Inc.

 

Filter, regulator, lubricator (FRL) assemblies are pre-packaged or modular assemblies of common configurations of air filters, regulators, lubricators, and gauges.

 

Specifications

 

Important specifications to consider when searching for filter, regulator, and lubricator assemblies include:

 

  • Regulator type
  • Media
  • Performance specifications
  • Adjustment control
  • Connectors or pipe size
  • Body material
  • Features
  • Environmental parameters

 

Regulator Type

There are several choices for regulator type for filter, regulator, and lubricator assemblies.

  • 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.
  • Differential or bias regulators maintain 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 Type

 

Media types can be any of the following:

 

  • Air
  • Fuel or oil
  • Gas
  • Hydraulic fluid
  • Liquid
  • Steam

 

Performance Specifications



Important performance specifications to consider when searching for filter, regulator, and lubricator (FRL) assemblies include:

 

  • Regulating (adjustment) range - Dictates the limits of adjustment control.
  • Maximum flow (gas or air) - Unnecessary to specify if primary application is liquid.
  • Maximum pressure rating - Refers to the pressure rating for the valve or inlet pressure for the regulator.
  • Filter minimum particle size rating - Applies to filter, regulator, and 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.

 

Adjustment Control

 

Choices for adjustment control for filter, regulator, and lubricator (FRL) assemblies include:

 

  • Manual
  • Analog voltage control
  • Analog current control
  • Pneumatic control
  • Digital interface

 

Connectors or Pipe Size

 

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
  • Metric pipe thread

 

Body Materials

 

Body materials can be:

 

  • Acetal
  • Aluminum
  • Brass
  • Bronze
  • Cast iron
  • Steel
  • Stainless steel
  • Zinc

 

Features

 

Common features for FRL assemblies include:

 

  • Integral pressure gauge
  • Pressure relief
  • Tamper-proof
  • Corrosive media

 

Environmental Parameters

 

Important environmental parameters to consider include operating temperature.

 

Standards

ADS AS3316 - FILTER PACK ASSEMBLY

BS ISO 6953-1 - PNEUMATIC FLUID POWER - COMPRESSED AIR PRESSURE REGULATORS AND FILTER-REGULATORS - PART 1: MAIN CHARACTERISTICS TO BE INCLUDED IN LITERATURE FROM SUPPLIERS AND PRODUCT-MARKING REQUIREMENTS

MIL-R-50657 - REGULATOR, 15 VOLT, BOARD ASSEMBLY: 10548959

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