281.491.2331 13839 West Bellfort Street Sugar Land, TX
281.491.2331 13839 West Bellfort Street Sugar Land, TX
ISO 9001:2015
U.S. Patents
90 + U.S. Patents
Since 1954
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The Welker FIR-1 Filter / Instrument Regulator is designed to filter and provide regulation of an instrument pneumatic supply. It is intended for use as part of instrument packages.

The regulator of the FIR-1 is non-relieving. Welker recommends that a relief valve, such as the Welker RV-1 or RV-3 series relief valves, be installed downstream of the FIR-1.



FIR-1 Filter / Instrument Regulator
Materials of Construction316/316L Stainless Steel, Kel-F® Seat, PTFE, Teflon®, Viton®
Filter Element10 micron Linear Polyethylene
35 micron Linear Polyethylene
Operating Pressure3000 psig MAOP @ -20 °F to 100 °F
Maximum Allowable Temperature200 °F
Inlet Pressure0 - 3000 psig
Outlet PressureDependent upon Spring Range. Refer to the Spring Range Disc under
the Regulator Jam Nut.
Instrument Air Connections1/4" NPT