FIR-1

Filter and regulate pneumatic supply gas in one compact instrument package

The Welker FIR-1 Filter / Instrument Regulator combines particulate filtration and pressure regulation for natural gas or instrument air supply lines. Designed for use upstream of pneumatic instruments as part of instrument packages, the FIR-1 helps remove damaging particles while reducing supply pressure to protect downstream equipment. With diaphragm sensing, adjustable output pressure with locknut, and a space-saving design, the FIR-1 supports sensitive low-pressure control, vibration-resistant settings, and longer regulator service life in natural gas and industrial instrumentation systems.

Where to Use

Instrument Gas and Air Supply Lines

Upstream of pneumatic instruments requiring particulate filtration and pressure regulation.

Resources

FIR-1 IOM

Diaphragm Sensing

Provides increased low-pressure sensitivity for precise instrument supply control.

Adjustable Output Pressure With Locknut

Allows field adjustment while helping prevent pressure settings from shifting due to vibration.

Space-Saving Design

Protects downstream equipment while fitting compact instrument packages.

	FIR-1
Materials of Construction	316/316L Stainless Steel, PTFE, PTFE or PCTFE Seat, FKM
Materials of Construction	Others Available
Inlet Pressure	0 – 3000 psig (0–206.8 barg)
Maximum Allowable Operating Pressure	3000 psig @ -20 °F to 120 °F (206.8 barg @ -28.8 °C to 48.8 °C)
Maximum Allowable Operating Temperature	200 °F (93.3 °C)
Connections	Inlet: ¼" FNPT
	Outlet: ¼" FNPT
	Others Available
Inlet Pressure	0–3000 psig (0–206.8 barg)
Outlet Pressure (Dependent Upon Spring Range)	0–25 psig (0–1.7 barg)
	0–50 psig (0–3.4 barg)
	20–100 psig (1.4–6.9 barg)
	75–200 psig (5.2–13.8 barg)
	(Refer to the Spring Range Disc Under the Jam Nut)
Operation	Diaphragm-Operated
Filter Element	10 micron or 35 micron Linear Polyethylene
Approximate Weight	5 lbs
Approximate Dimensions (Not Including Options)	8" x 2¼" x 2¼" (Length x Width x Height)
Features	Connections for Relief Valve and Pressure Gauge
Features	Welker Strongly Recommends Connecting a Relief Valve and a Pressure Gauge to the Filter / Instrument Regulator

FIR-1

Where to Use

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