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Midwest Sight Flow Indicators

Series SFI-100 & SFI-300 MIDWEST Sight Flow Indicator

Inexpensive Protection for Expensive Equipment and Systems

Series 100 and 300 Midwest Sight Flow Indicators are manufactured of quality materials and safety tested to assure long, dependable service at economical prices. The 100 and 300 Series offer threaded process connections, viewing windows, and bodies of brass or 316 SS. The 100 type has a single window with a rotating impeller, the 300 type has a double window with a rotating impeller, the 350 type has a double window with no moving indicator, and the 360 type has a double window with a flapper. All the types feature a removable window for easy service and replacement of wearing parts.  Download


Midwest Sight Flow Indicators Specifications

  • Service:Compatible gases and liquids.
  • Wetted Materials:Window: tempered glass; Body: bronze or 316 SS; Gasket: Buna-N, fluoroelastomer or PTFE; Indicator: ABS or 316 SS impeller (100 and 300), 304 SS or 316 SS flapper (360).
  • Temperature Limit:200°F (93°C).
  • Pressure Limit:125 psig (8.62 bar), 150 psig (10.34 bar) on “MP” Models.
  • Connections:Threaded.


Available Bulls-Eye NPT Models

Series 100 - Bronze - Single Window - FNPT - Impeller

SFI-100-1/41/4" FNPTBronzeSingleImpeller
SFI-100-3/83/8" FNPTBronzeSingleImpeller
SFI-100-1/21/2" FNPTBronzeSingleImpeller
SFI-100-3/43/4" FNPTBronzeSingleImpeller
SFI-100-11" FNPTBronzeSingleImpeller
SFI-100-1-1/41-1/4" FNPTBronzeSingleImpeller
SFI-100-1-1/21-1/2" FNPTBronzeSingleImpeller
SFI-100-22" FNPTBronzeSingleImpeller

Series 300 - Bronze - Double Window - FNPT - Impeller

SFI-300-1/41/4" FNPTBronzeDoubleImpeller
SFI-300-3/83/8" FNPTBronzeDoubleImpeller
SFI-300-1/21/2" FNPTBronzeDoubleImpeller
SFI-300-3/43/4" FNPTBronzeDoubleImpeller
SFI-300-11" FNPTBronzeDoubleImpeller
SFI-300-1-1/41-1/4" FNPTBronzeDoubleImpeller
SFI-300-1-1/21-1/2" FNPTBronzeDoubleImpeller
SFI-300-22" FNPTBronzeDoubleImpeller

Series 300SS - 316SS - Double Window - FNPT - Impeller

SFI-300SS-1/41/4" FNPT316SSDoubleImpeller
SFI-300SS-3/83/8" FNPT316SSDoubleImpeller
SFI-300SS-1/21/2" FNPT316SSDoubleImpeller
SFI-300SS-3/43/4" FNPT316SSDoubleImpeller
SFI-300SS-11" FNPT316SSDoubleImpeller
SFI-300SS-1-1/41-1/4" FNPT316SSDoubleImpeller
SFI-300SS-1-1/21-1/2" FNPT316SSDoubleImpeller
SFI-300SS-22" FNPT316SSDoubleImpeller

Series 350 - Bronze - Double Window - FNPT - No Impeller

SFI-350-1/41/4" FNPTBronzeDoubleNo Impeller
SFI-350-3/83/8" FNPTBronzeDoubleNo Impeller
SFI-350-1/21/2" FNPTBronzeDoubleNo Impeller
SFI-350-3/43/4" FNPTBronzeDoubleNo Impeller
SFI-350-11" FNPTBronzeDoubleNo Impeller
SFI-350-1-1/41-1/4" FNPTBronzeDoubleNo Impeller
SFI-350-1-1/21-1/2" FNPTBronzeDoubleNo Impeller
SFI-350-22" FNPTBronzeDoubleNo Impeller

Series 350SS - 316SS - Double Window - FNPT - No Impeller

SFI-350SS-1/41/4" FNPT316SSDoubleNo Impeller
SFI-350SS-3/83/8" FNPT316SSDoubleNo Impeller
SFI-350SS-1/21/2" FNPT316SSDoubleNo Impeller
SFI-350SS-3/43/4" FNPT316SSDoubleNo Impeller
SFI-350SS-11" FNPT316SSDoubleNo Impeller
SFI-350SS-1-1/41-1/4" FNPT316SSDoubleNo Impeller
SFI-350SS-1-1/21-1/2" FNPT316SSDoubleNo Impeller
SFI-350SS-22" FNPT316SSDoubleNo Impeller

Series 360 - Bronze - Double Window - FNPT - Flapper

SFI-360-1/41/4" FNPTBronzeDoubleFlapper
SFI-360-3/83/8" FNPTBronzeDoubleFlapper
SFI-360-1/21/2" FNPTBronzeDoubleFlapper
SFI-360-3/43/4" FNPTBronzeDoubleFlapper
SFI-360-11" FNPTBronzeDoubleFlapper
SFI-360-1-1/41-1/4" FNPTBronzeDoubleFlapper
SFI-360-1-1/21-1/2" FNPTBronzeDoubleFlapper
SFI-360-22" FNPTBronzeDoubleFlapper

Series 360SS - 316SS - Double Window - FNPT - Flapper

SFI-360SS-1/41/4" FNPT316SSDoubleFlapper
SFI-360SS-3/83/8" FNPT316SSDoubleFlapper
SFI-360SS-1/21/2" FNPT316SSDoubleFlapper
SFI-360SS-3/43/4" FNPT316SSDoubleFlapper
SFI-360SS-11" FNPT316SSDoubleFlapper
SFI-360SS-1-1/41-1/4" FNPT316SSDoubleFlapper
SFI-360SS-1-1/21-1/2" FNPT316SSDoubleFlapper
SFI-360SS-22" FNPT316SSDoubleFlapper