01
Select each function, not only the port size
Filtration rating, bowl capacity, drain type, regulator range, relieving behavior, pressure droop, flow capacity, bowl material, and environmental limits all affect suitability. The required ISO 8573-1 purity class may also require upstream dryers or finer coalescing stages beyond a general-purpose FRL filter.
02
Lubrication is an application decision
Many current valves and cylinders are factory lubricated for normal service and may not need continuous added oil. Once oil-mist lubrication is introduced, it normally needs to remain consistent because it can alter or wash away the original lubricant. Confirm compatibility with downstream devices, product instructions, the process, and exhaust-air requirements.
03
Flow curves reveal the real pressure behavior
A regulator's outlet pressure drops as demand increases. A nominal port size does not show this droop or the loss across the filter and lubricator. Select from the manufacturer's flow curve at the required inlet pressure, set pressure, and flow, with allowance for filter loading.
Selection checklist
What to verify before selection
- 01
Required air purity and filtration grade
- 02
Maximum inlet and target outlet pressure
- 03
Flow at peak simultaneous demand
- 04
Manual, semi-auto, or automatic drain
- 05
Bowl material and guard
- 06
Whether downstream equipment permits or requires oil
Application caution
Common mistakes
- Adding a lubricator by default
- Sizing the assembly from thread size alone
- Ignoring pressure loss as the filter element loads
FAQ